<?xml version="1.0" encoding="utf-8"?>
<!--XBRL document created with Toppan Merrill Bridge  11.2.0.5 -->
<!--Based on XBRL 2.1-->
<!--Created on: 2/12/2026 5:54:06 PM-->
<!--Modified on: 2/12/2026 5:54:06 PM-->
<xsd:schema xmlns:ref="http://www.xbrl.org/2006/ref" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:us-gaap="http://fasb.org/us-gaap/2025" xmlns:utr="http://www.xbrl.org/2009/utr" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:srt="http://fasb.org/srt/2025" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:dei="http://xbrl.sec.gov/dei/2025" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:deprecated="http://www.xbrl.org/2009/role/deprecated" xmlns:dtr="http://www.xbrl.org/2009/dtr" xmlns:enum2="http://xbrl.org/2020/extensible-enumerations-2.0" xmlns:net="http://www.xbrl.org/2009/role/net" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:attributeFormDefault="unqualified" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xs="http://www.w3.org/2001/XMLSchema" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://birtchtechcorp.com/20250930" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:bcht="http://birtchtechcorp.com/20250930">
  <xsd:import namespace="https://xbrl.org/2023/calculation-1.1" schemaLocation="https://www.xbrl.org/2023/calculation-1.1.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xsd:import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd" />
  <xsd:import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd" />
  <xsd:annotation>
    <xsd:appinfo>
      <link:roleType roleURI="http://birtchtechcorp.com/role/StatementConsolidatedBalanceSheets" id="StatementConsolidatedBalanceSheets">
        <link:definition>100100 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/StatementConsolidatedStatementsOfOperations" id="StatementConsolidatedStatementsOfOperations">
        <link:definition>100200 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/StatementConsolidatedStatementsOfCashFlows" id="StatementConsolidatedStatementsOfCashFlows">
        <link:definition>100400 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/StatementCondensedConsolidatedBalanceSheets" id="StatementCondensedConsolidatedBalanceSheets">
        <link:definition>200100 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/StatementCondensedConsolidatedStatementsOfOperationsUnaudited" id="StatementCondensedConsolidatedStatementsOfOperationsUnaudited">
        <link:definition>200200 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudtied" id="StatementCondensedConsolidatedStatementsOfCashFlowsUnaudtied">
        <link:definition>200400 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDTIED)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureInventoryDetailss" id="DisclosureInventoryDetailss">
        <link:definition>240401 - Disclosure - Inventory (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosurePropertyAndEquipmentNetDetailss" id="DisclosurePropertyAndEquipmentNetDetailss">
        <link:definition>240501 - Disclosure - Property and Equipment, Net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/StatementConsolidatedStatementsOfStockholdersDeficit" id="StatementConsolidatedStatementsOfStockholdersDeficit">
        <link:definition>100300 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS DEFICIT</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatementsDetails" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatementsDetails">
        <link:definition>140201 - Disclosure - Restatement of Previously Issued Financial Statements (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatementsDetails1" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatementsDetails1">
        <link:definition>140202 - Disclosure - Restatement of Previously Issued Financial Statements (Details 1)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatementsDetails2" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatementsDetails2">
        <link:definition>140203 - Disclosure - Restatement of Previously Issued Financial Statements (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatementsDetails3" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatementsDetails3">
        <link:definition>140204 - Disclosure - Restatement of Previously Issued Financial Statements (Details 3)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails">
        <link:definition>140401 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails1" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails1">
        <link:definition>140402 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details 1)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails3" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails3">
        <link:definition>140404 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details 3)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetailsNarrative" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetailsNarrative">
        <link:definition>140405 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosurePropertyAndEquipmentNetDetails" id="DisclosurePropertyAndEquipmentNetDetails">
        <link:definition>140601 - Disclosure - Property and Equipment Net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosurePropertyAndEquipmentNetDetailsNarrative" id="DisclosurePropertyAndEquipmentNetDetailsNarrative">
        <link:definition>140602 - Disclosure - Property and Equipment Net (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRelatedPartyDetails" id="DisclosureRelatedPartyDetails">
        <link:definition>140801 - Disclosure - Related party (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRelatedPartyDetailsNarrative" id="DisclosureRelatedPartyDetailsNarrative">
        <link:definition>140803 - Disclosure - Related party (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOperatingLeasesDetailsNarrative" id="DisclosureOperatingLeasesDetailsNarrative">
        <link:definition>140904 - Disclosure - Operating Leases (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureCommitmentsAndContingenciesDetailsNarrative" id="DisclosureCommitmentsAndContingenciesDetailsNarrative">
        <link:definition>141001 - Disclosure - Commitments and Contingencies (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureStockBasedCompensationDetailsNarrative" id="DisclosureStockBasedCompensationDetailsNarrative">
        <link:definition>141102 - Disclosure - Stock Based Compensation (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureWarrantsDetails" id="DisclosureWarrantsDetails">
        <link:definition>141201 - Disclosure - Warrants (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureWarrantsDetails1" id="DisclosureWarrantsDetails1">
        <link:definition>141202 - Disclosure - Warrants (Details 1)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureTaxesDetails" id="DisclosureTaxesDetails">
        <link:definition>141301 - Disclosure - Taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureTaxesDetailsNarrative" id="DisclosureTaxesDetailsNarrative">
        <link:definition>141304 - Disclosure - Taxes (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureSegmentAndGeographicInformationDetails" id="DisclosureSegmentAndGeographicInformationDetails">
        <link:definition>141401 - Disclosure - Segment and Geographic Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureSubsequentEventsDetailsNarrative" id="DisclosureSubsequentEventsDetailsNarrative">
        <link:definition>141501 - Disclosure - Subsequent Events (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRestatementOfQuarterlyFinancialInformationUnauditedDetails" id="DisclosureRestatementOfQuarterlyFinancialInformationUnauditedDetails">
        <link:definition>141601 - Disclosure - Restatement of Quarterly Financial Information (Unaudited) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRestatementOfQuarterlyFinancialInformationUnauditedDetails1" id="DisclosureRestatementOfQuarterlyFinancialInformationUnauditedDetails1">
        <link:definition>141602 - Disclosure - Restatement of Quarterly Financial Information (Unaudited) (Details 1)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRestatementOfQuarterlyFinancialInformationUnauditedDetails2" id="DisclosureRestatementOfQuarterlyFinancialInformationUnauditedDetails2">
        <link:definition>141603 - Disclosure - Restatement of Quarterly Financial Information (Unaudited) (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/StatementCondensedConsolidatedStatementOfStockholdersEquityDeficitUnaudtied" id="StatementCondensedConsolidatedStatementOfStockholdersEquityDeficitUnaudtied">
        <link:definition>200300 - Statement - CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS EQUITY (DEFICIT) (UNAUDTIED)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetailss" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetailss">
        <link:definition>240301 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails1s" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails1s">
        <link:definition>240302 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details 1)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails2s" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails2s">
        <link:definition>240303 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails3s" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails3s">
        <link:definition>240304 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details 3)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetailsNarratives" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetailsNarratives">
        <link:definition>240305 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosurePropertyAndEquipmentNetDetailsNarratives" id="DisclosurePropertyAndEquipmentNetDetailsNarratives">
        <link:definition>240502 - Disclosure - Property and Equipment, Net (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRelatedPartyDetailsNarratives" id="DisclosureRelatedPartyDetailsNarratives">
        <link:definition>240702 - Disclosure - Related party (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOperatingLeasesDetailsNarratives" id="DisclosureOperatingLeasesDetailsNarratives">
        <link:definition>240804 - Disclosure - Operating Leases (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureCommitmentsAndContingenciesDetailsNarratives" id="DisclosureCommitmentsAndContingenciesDetailsNarratives">
        <link:definition>240901 - Disclosure - Commitments and Contingencies (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureStockBasedCompensationDetailsNarratives" id="DisclosureStockBasedCompensationDetailsNarratives">
        <link:definition>241002 - Disclosure - Stock Based Compensation (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureSegmentAndGeographicInformationDetailss" id="DisclosureSegmentAndGeographicInformationDetailss">
        <link:definition>241201 - Disclosure - Segment and Geographic Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DocumentCover" id="DocumentCover">
        <link:definition>100090 - Document - Cover</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/StatementConsolidatedBalanceSheetsParenthetical" id="StatementConsolidatedBalanceSheetsParenthetical">
        <link:definition>100105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOrganization" id="DisclosureOrganization">
        <link:definition>110101 - Disclosure - Organization</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatements" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatements">
        <link:definition>110201 - Disclosure - Restatement of Previously Issued Financial Statements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureGoingConcernAndFinancialCondition" id="DisclosureGoingConcernAndFinancialCondition">
        <link:definition>110301 - Disclosure - Going Concern and Financial Condition</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPolicies" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPolicies">
        <link:definition>110401 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureInventory" id="DisclosureInventory">
        <link:definition>110501 - Disclosure - Inventory</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosurePropertyAndEquipmentNet" id="DisclosurePropertyAndEquipmentNet">
        <link:definition>110601 - Disclosure - Property And Equipment Net</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureIntellectualProperty" id="DisclosureIntellectualProperty">
        <link:definition>110701 - Disclosure - Intellectual Property</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRelatedParty" id="DisclosureRelatedParty">
        <link:definition>110801 - Disclosure - Related Party</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOperatingLeases" id="DisclosureOperatingLeases">
        <link:definition>110901 - Disclosure - Operating Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureCommitmentsAndContingencies" id="DisclosureCommitmentsAndContingencies">
        <link:definition>111001 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureStockBasedCompensation" id="DisclosureStockBasedCompensation">
        <link:definition>111101 - Disclosure - Stock Based Compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureWarrants" id="DisclosureWarrants">
        <link:definition>111201 - Disclosure - Warrants</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureTaxes" id="DisclosureTaxes">
        <link:definition>111301 - Disclosure - Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureSegmentAndGeographicInformation" id="DisclosureSegmentAndGeographicInformation">
        <link:definition>111401 - Disclosure - Segment and Geographic Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureSubsequentEvents" id="DisclosureSubsequentEvents">
        <link:definition>111501 - Disclosure - Subsequent Events</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRestatementOfQuarterlyFinancialInformationUnaudited" id="DisclosureRestatementOfQuarterlyFinancialInformationUnaudited">
        <link:definition>111601 - Disclosure - Restatement of Quarterly Financial Information (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies">
        <link:definition>120402 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatementsTables" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatementsTables">
        <link:definition>130203 - Disclosure - Restatement of Previously Issued Financial Statements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables">
        <link:definition>130403 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureInventoryTables" id="DisclosureInventoryTables">
        <link:definition>130503 - Disclosure - Inventory (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosurePropertyAndEquipmentNetTables" id="DisclosurePropertyAndEquipmentNetTables">
        <link:definition>130603 - Disclosure - Property And Equipment Net (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureIntellectualPropertyTables" id="DisclosureIntellectualPropertyTables">
        <link:definition>130703 - Disclosure - Intellectual Property (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRelatedPartyTables" id="DisclosureRelatedPartyTables">
        <link:definition>130803 - Disclosure - Related Party (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOperatingLeasesTables" id="DisclosureOperatingLeasesTables">
        <link:definition>130903 - Disclosure - Operating Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureStockBasedCompensationTables" id="DisclosureStockBasedCompensationTables">
        <link:definition>131103 - Disclosure - Stock Based Compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureWarrantsTables" id="DisclosureWarrantsTables">
        <link:definition>131203 - Disclosure - Warrants (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureTaxesTables" id="DisclosureTaxesTables">
        <link:definition>131303 - Disclosure - Taxes (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureSegmentAndGeographicInformationTables" id="DisclosureSegmentAndGeographicInformationTables">
        <link:definition>131403 - Disclosure - Segment and Geographic Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRestatementOfQuarterlyFinancialInformationUnauditedTables" id="DisclosureRestatementOfQuarterlyFinancialInformationUnauditedTables">
        <link:definition>131603 - Disclosure - Restatement of Quarterly Financial Information (Unaudited) (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOrganizationDetailsNarrative" id="DisclosureOrganizationDetailsNarrative">
        <link:definition>140101 - Disclosure - Organization (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatementsDetailsNarrative" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatementsDetailsNarrative">
        <link:definition>140205 - Disclosure - Restatement of Previously Issued Financial Statements (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureGoingConcernAndFinancialConditionDetailsNarrative" id="DisclosureGoingConcernAndFinancialConditionDetailsNarrative">
        <link:definition>140301 - Disclosure - Going Concern and Financial Condition (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails2" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails2">
        <link:definition>140403 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureInventoryDetails" id="DisclosureInventoryDetails">
        <link:definition>140501 - Disclosure - Inventory (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureIntellectualPropertyDetails" id="DisclosureIntellectualPropertyDetails">
        <link:definition>140701 - Disclosure - Intellectual Property (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureIntellectualPropertyDetails1" id="DisclosureIntellectualPropertyDetails1">
        <link:definition>140702 - Disclosure - Intellectual Property (Details 1)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureIntellectualPropertyDetailsNarrative" id="DisclosureIntellectualPropertyDetailsNarrative">
        <link:definition>140703 - Disclosure - Intellectual Property (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRelatedPartyDetails1" id="DisclosureRelatedPartyDetails1">
        <link:definition>140802 - Disclosure - Related party (Details 1)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOperatingLeasesDetails" id="DisclosureOperatingLeasesDetails">
        <link:definition>140901 - Disclosure - Operating Leases (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOperatingLeasesDetails1" id="DisclosureOperatingLeasesDetails1">
        <link:definition>140902 - Disclosure - Operating Leases (Details 1)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOperatingLeasesDetails2" id="DisclosureOperatingLeasesDetails2">
        <link:definition>140903 - Disclosure - Operating Leases (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureStockBasedCompensationDetails" id="DisclosureStockBasedCompensationDetails">
        <link:definition>141101 - Disclosure - Stock Based Compensation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureWarrantsDetailsNarrative" id="DisclosureWarrantsDetailsNarrative">
        <link:definition>141203 - Disclosure - Warrants (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureTaxesDetails1" id="DisclosureTaxesDetails1">
        <link:definition>141302 - Disclosure - Taxes (Details 1)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureTaxesDetails2" id="DisclosureTaxesDetails2">
        <link:definition>141303 - Disclosure - Taxes (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/StatementConsolidatedBalanceSheetsParentheticals" id="StatementConsolidatedBalanceSheetsParentheticals">
        <link:definition>200105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOrganizations" id="DisclosureOrganizations">
        <link:definition>210101 - Disclosure - Organization</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureGoingConcernAndFinancialConditions" id="DisclosureGoingConcernAndFinancialConditions">
        <link:definition>210201 - Disclosure - Going Concern and Financial Condition</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciess" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciess">
        <link:definition>210301 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureInventorys" id="DisclosureInventorys">
        <link:definition>210401 - Disclosure - Inventory</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosurePropertyAndEquipmentNets" id="DisclosurePropertyAndEquipmentNets">
        <link:definition>210501 - Disclosure - Property And Equipment Net</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureIntellectualPropertys" id="DisclosureIntellectualPropertys">
        <link:definition>210601 - Disclosure - Intellectual Property</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRelatedPartys" id="DisclosureRelatedPartys">
        <link:definition>210701 - Disclosure - Related Party</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOperatingLeasess" id="DisclosureOperatingLeasess">
        <link:definition>210801 - Disclosure - Operating Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureCommitmentsAndContingenciess" id="DisclosureCommitmentsAndContingenciess">
        <link:definition>210901 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureStockBasedCompensations" id="DisclosureStockBasedCompensations">
        <link:definition>211001 - Disclosure - Stock Based Compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureWarrantss" id="DisclosureWarrantss">
        <link:definition>211101 - Disclosure - Warrants</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureSegmentAndGeographicInformations" id="DisclosureSegmentAndGeographicInformations">
        <link:definition>211201 - Disclosure - Segment and Geographic Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPoliciess" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPoliciess">
        <link:definition>220302 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTabless" id="DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTabless">
        <link:definition>230303 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureInventoryTabless" id="DisclosureInventoryTabless">
        <link:definition>230403 - Disclosure - Inventory (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosurePropertyAndEquipmentNetTabless" id="DisclosurePropertyAndEquipmentNetTabless">
        <link:definition>230503 - Disclosure - Property And Equipment Net (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureIntellectualPropertyTabless" id="DisclosureIntellectualPropertyTabless">
        <link:definition>230603 - Disclosure - Intellectual Property (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRelatedPartyTabless" id="DisclosureRelatedPartyTabless">
        <link:definition>230703 - Disclosure - Related Party (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOperatingLeasesTabless" id="DisclosureOperatingLeasesTabless">
        <link:definition>230803 - Disclosure - Operating Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureStockBasedCompensationTabless" id="DisclosureStockBasedCompensationTabless">
        <link:definition>231003 - Disclosure - Stock Based Compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureSegmentAndGeographicInformationTabless" id="DisclosureSegmentAndGeographicInformationTabless">
        <link:definition>231203 - Disclosure - Segment and Geographic Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOrganizationDetailsNarratives" id="DisclosureOrganizationDetailsNarratives">
        <link:definition>240101 - Disclosure - Organization (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureGoingConcernAndFinancialConditionDetailsNarratives" id="DisclosureGoingConcernAndFinancialConditionDetailsNarratives">
        <link:definition>240201 - Disclosure - Going Concern and Financial Condition (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureIntellectualPropertyDetailss" id="DisclosureIntellectualPropertyDetailss">
        <link:definition>240601 - Disclosure - Intellectual Property (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureIntellectualPropertyDetails1s" id="DisclosureIntellectualPropertyDetails1s">
        <link:definition>240602 - Disclosure - Intellectual Property (Details 1)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureIntellectualPropertyDetailsNarratives" id="DisclosureIntellectualPropertyDetailsNarratives">
        <link:definition>240603 - Disclosure - Intellectual Property (Details Narrative)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureRelatedPartyDetailss" id="DisclosureRelatedPartyDetailss">
        <link:definition>240701 - Disclosure - Related party (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOperatingLeasesDetailss" id="DisclosureOperatingLeasesDetailss">
        <link:definition>240801 - Disclosure - Operating Leases (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOperatingLeasesDetails1s" id="DisclosureOperatingLeasesDetails1s">
        <link:definition>240802 - Disclosure - Operating Leases (Details 1)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureOperatingLeasesDetails2s" id="DisclosureOperatingLeasesDetails2s">
        <link:definition>240803 - Disclosure - Operating Leases (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureStockBasedCompensationDetailss" id="DisclosureStockBasedCompensationDetailss">
        <link:definition>241001 - Disclosure - Stock Based Compensation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:type="simple" xlink:href="tmb-20250930_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="tmb-20250930_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="tmb-20250930_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="tmb-20250930_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:roleType roleURI="http://birtchtechcorp.com/role/DisclosureStandardAndCustomAxisDomainDefaults" id="DisclosureStandardAndCustomAxisDomainDefaults">
        <link:definition>99900 - Disclosure - Standard And Custom Axis Domain Defaults</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:element id="bcht_ProfitShareLiabilityRelatedPartyCurrent" xbrli:periodType="instant" xbrli:balance="credit" name="ProfitShareLiabilityRelatedPartyCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ProfitShareLiabilityRelatedPartyNoncurrent" xbrli:periodType="instant" xbrli:balance="credit" name="ProfitShareLiabilityRelatedPartyNoncurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_AccountsPayableAndAccruedExpensesRelatedPartyCurrent" xbrli:periodType="instant" xbrli:balance="credit" name="AccountsPayableAndAccruedExpensesRelatedPartyCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_NetIncomeExpenseFromLegalClaims" xbrli:periodType="duration" xbrli:balance="credit" name="NetIncomeExpenseFromLegalClaims" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_GainLossOnChangeInFairValueOfProfitShareAndUnsecuredNote" xbrli:periodType="duration" xbrli:balance="credit" name="GainLossOnChangeInFairValueOfProfitShareAndUnsecuredNote" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_OtherRestatementAdjustmentsValuation" xbrli:periodType="duration" xbrli:balance="credit" name="OtherRestatementAdjustmentsValuation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_BalanceRestatedShares" xbrli:periodType="duration" name="BalanceRestatedShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_BalanceAsRestatedAmount" xbrli:periodType="duration" xbrli:balance="credit" name="BalanceAsRestatedAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_StockIssuedForCashlessExerciseOfOptionsShares" xbrli:periodType="duration" name="StockIssuedForCashlessExerciseOfOptionsShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_StockIssuedForCashlessExerciseOfOptionsAmount" xbrli:periodType="duration" xbrli:balance="credit" name="StockIssuedForCashlessExerciseOfOptionsAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_StockIssuedDuringPeriodSharesStockWarrantsExercised" xbrli:periodType="duration" name="StockIssuedDuringPeriodSharesStockWarrantsExercised" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_StockIssuedDuringPeriodValueStockWarrantsExercised" xbrli:periodType="duration" xbrli:balance="credit" name="StockIssuedDuringPeriodValueStockWarrantsExercised" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_StockBasedCompensationAmortizationOfPrepaidServices" xbrli:periodType="duration" xbrli:balance="debit" name="StockBasedCompensationAmortizationOfPrepaidServices" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_NonCashInterestIncome" xbrli:periodType="duration" xbrli:balance="credit" name="NonCashInterestIncome" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_CashPaidDuringThePeriodForAbstract" xbrli:periodType="duration" abstract="true" name="CashPaidDuringThePeriodForAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_CapitalFromRelatedPartyDebtExtinguishments" xbrli:periodType="duration" xbrli:balance="credit" name="CapitalFromRelatedPartyDebtExtinguishments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_RightOfUseAssetAndOperatingLeaseLiabilityRecognition" xbrli:periodType="duration" xbrli:balance="debit" name="RightOfUseAssetAndOperatingLeaseLiabilityRecognition" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_RestatementPreviouslyIssuedInvestmentFinancialStatementsDisclosureTextBlock" xbrli:periodType="duration" name="RestatementPreviouslyIssuedInvestmentFinancialStatementsDisclosureTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_WarrantsDisclosureTextBlock" xbrli:periodType="duration" name="WarrantsDisclosureTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_IntellectualPropertyPolicyTextBlock" xbrli:periodType="duration" name="IntellectualPropertyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_DisaggregationOfRevenuePolicyTextBlock" xbrli:periodType="duration" name="DisaggregationOfRevenuePolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountPolicyTextBlock" xbrli:periodType="duration" name="ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_CustomerAndSupplierConcentrationPolicyTextBlock" xbrli:periodType="duration" name="CustomerAndSupplierConcentrationPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_ScheduleOfSalesByOperatingSegmentTableTextBlock" xbrli:periodType="duration" name="ScheduleOfSalesByOperatingSegmentTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_ScheduleCommonStockEquivalentsExcludedFromDilutiveLossPerShareTableTextBlock" xbrli:periodType="duration" name="ScheduleCommonStockEquivalentsExcludedFromDilutiveLossPerShareTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_ScheduleOfUnsecuredNotesPayableTableTextBlock" xbrli:periodType="duration" name="ScheduleOfUnsecuredNotesPayableTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_ScheduleOfOperatingLeaseRightOfUseAssetAndLiabilitiesTableTextBlock" xbrli:periodType="duration" name="ScheduleOfOperatingLeaseRightOfUseAssetAndLiabilitiesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_ScheduleOfWarrantTableTextBlock" xbrli:periodType="duration" name="ScheduleOfWarrantTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_ScheduleOfQuarterlyFinancialInformationConsolidatedBalanceSheetTableTextBlock" xbrli:periodType="duration" name="ScheduleOfQuarterlyFinancialInformationConsolidatedBalanceSheetTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_ScheduleOfQuarterlyFinancialInformationConsolidatedStatementOfOperationsTableTextBlock" xbrli:periodType="duration" name="ScheduleOfQuarterlyFinancialInformationConsolidatedStatementOfOperationsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_ScheduleOfQuarterlyFinancialInformationConsolidatedStatementOfCashFlowsTableTextBlock" xbrli:periodType="duration" name="ScheduleOfQuarterlyFinancialInformationConsolidatedStatementOfCashFlowsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" />
  <xsd:element id="bcht_MinorityInterestOwnershipPercentage" xbrli:periodType="instant" name="MinorityInterestOwnershipPercentage" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" />
  <xsd:element id="bcht_OthersNonoperatingIncomesExpense" xbrli:periodType="duration" xbrli:balance="credit" name="OthersNonoperatingIncomesExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_DecreaseInAmountOfAccumulatedDeficit" xbrli:periodType="instant" xbrli:balance="credit" name="DecreaseInAmountOfAccumulatedDeficit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_WorkingcapitalDeficiency" xbrli:periodType="instant" xbrli:balance="debit" name="WorkingcapitalDeficiency" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_RetainedEarningAccumulatedDeficit" xbrli:periodType="instant" xbrli:balance="credit" name="RetainedEarningAccumulatedDeficit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ProfitLossNet" xbrli:periodType="duration" xbrli:balance="credit" name="ProfitLossNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_GainLossContingency" xbrli:periodType="duration" xbrli:balance="credit" name="GainLossContingency" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ProfitShareLiabilityRelatedParty" xbrli:periodType="instant" xbrli:balance="credit" name="ProfitShareLiabilityRelatedParty" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_BasicAbstract" xbrli:periodType="duration" abstract="true" name="BasicAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_DilutedAbstract" xbrli:periodType="duration" abstract="true" name="DilutedAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_WeightedAverageNumberOfDilutedShareOutstanding" xbrli:periodType="duration" name="WeightedAverageNumberOfDilutedShareOutstanding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_StockOptionsEffectOfDilutedSecurities" xbrli:periodType="duration" name="StockOptionsEffectOfDilutedSecurities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_WeightedAverageSharesUsedInTheCalculationOfDilutedEarningsPerShare" xbrli:periodType="duration" name="WeightedAverageSharesUsedInTheCalculationOfDilutedEarningsPerShare" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_CashFDICInsuredLimitAmount" xbrli:periodType="instant" xbrli:balance="debit" name="CashFDICInsuredLimitAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_RevenueForLicenses" xbrli:periodType="duration" xbrli:balance="credit" name="RevenueForLicenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_OverTheTimeRevenueRecognizedOfLicenses" xbrli:periodType="duration" xbrli:balance="credit" name="OverTheTimeRevenueRecognizedOfLicenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ConcentrationRiskPercentage" xbrli:periodType="duration" name="ConcentrationRiskPercentage" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" />
  <xsd:element id="bcht_PropertyPlantsAndEquipmentUsefulLife" xbrli:periodType="duration" name="PropertyPlantsAndEquipmentUsefulLife" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" />
  <xsd:element id="bcht_UnsecuredNotePayable" xbrli:periodType="instant" xbrli:balance="credit" name="UnsecuredNotePayable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_RepaymentOfUnsecuredNotesPayabl" xbrli:periodType="instant" xbrli:balance="credit" name="RepaymentOfUnsecuredNotesPayabl" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_FairValueAdjustmentOnExtinguishment" xbrli:periodType="instant" xbrli:balance="credit" name="FairValueAdjustmentOnExtinguishment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_FairvalueAdjustment" xbrli:periodType="instant" xbrli:balance="credit" name="FairvalueAdjustment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_UnsecuredNotePayableNetOfCurrentPortion" xbrli:periodType="instant" xbrli:balance="debit" name="UnsecuredNotePayableNetOfCurrentPortion" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ProfitShareLiabilityRelatedPartiesNet" xbrli:periodType="instant" xbrli:balance="credit" name="ProfitShareLiabilityRelatedPartiesNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_Modification" xbrli:periodType="duration" xbrli:balance="debit" name="Modification" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_InterestExpensesSecuredNote" xbrli:periodType="duration" xbrli:balance="debit" name="InterestExpensesSecuredNote" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_CapitalContribution" xbrli:periodType="duration" xbrli:balance="credit" name="CapitalContribution" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_AdditionToProfitShare" xbrli:periodType="duration" xbrli:balance="credit" name="AdditionToProfitShare" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_LicenseFeeDue" xbrli:periodType="duration" xbrli:balance="debit" name="LicenseFeeDue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_FairValueInputDiscountForLackOfMarketability" xbrli:periodType="duration" name="FairValueInputDiscountForLackOfMarketability" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" />
  <xsd:element id="bcht_RelatedPartyTransactionAmountsOfTransactionDebt" xbrli:periodType="instant" xbrli:balance="debit" name="RelatedPartyTransactionAmountsOfTransactionDebt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ProfitshareInUnsecuredNoteFinancing" xbrli:periodType="duration" xbrli:balance="credit" name="ProfitshareInUnsecuredNoteFinancing" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_RestructedProfitSharePercentage" xbrli:periodType="duration" name="RestructedProfitSharePercentage" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" />
  <xsd:element id="bcht_GrantedProfitParticipation" xbrli:periodType="duration" xbrli:balance="credit" name="GrantedProfitParticipation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_AnnuallyInterestRate" xbrli:periodType="duration" name="AnnuallyInterestRate" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" />
  <xsd:element id="bcht_ProfitShareLiabilityDescription" xbrli:periodType="duration" name="ProfitShareLiabilityDescription" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_GainLossOnChangeInFairValue" xbrli:periodType="duration" xbrli:balance="credit" name="GainLossOnChangeInFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ProfitSharefairvalue" xbrli:periodType="duration" xbrli:balance="credit" name="ProfitSharefairvalue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_OutstandingUnsecuredDebt" xbrli:periodType="instant" xbrli:balance="credit" name="OutstandingUnsecuredDebt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ACMidwestAmendmentDescription" xbrli:periodType="duration" name="ACMidwestAmendmentDescription" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_FairValueOfSharingProfit" xbrli:periodType="duration" xbrli:balance="debit" name="FairValueOfSharingProfit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_YearlyPaymentDescription" xbrli:periodType="duration" name="YearlyPaymentDescription" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_RepaymentOfDebtDescription" xbrli:periodType="duration" name="RepaymentOfDebtDescription" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_DebtExtinguishmentRecordedAsCaptalCharge" xbrli:periodType="duration" xbrli:balance="credit" name="DebtExtinguishmentRecordedAsCaptalCharge" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_OperatingLeaseLiabilityPaymentsDue" xbrli:periodType="instant" xbrli:balance="credit" name="OperatingLeaseLiabilityPaymentsDue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_OperatingLeaseLiabilityUndiscountedExcessAmount" xbrli:periodType="instant" xbrli:balance="credit" name="OperatingLeaseLiabilityUndiscountedExcessAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_LeaseLiability" xbrli:periodType="instant" xbrli:balance="credit" name="LeaseLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_RepaymentsOfLeaseTermDescription" xbrli:periodType="duration" name="RepaymentsOfLeaseTermDescription" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_OperatingLeaseWeightedAverageRemainingLeasesTerm" xbrli:periodType="duration" name="OperatingLeaseWeightedAverageRemainingLeasesTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" />
  <xsd:element id="bcht_MonthlyRentDescription" xbrli:periodType="duration" name="MonthlyRentDescription" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_LesseeOperatingLeaseTermOfContract1" xbrli:periodType="duration" name="LesseeOperatingLeaseTermOfContract1" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_PatentInfringementPayment" xbrli:periodType="instant" xbrli:balance="credit" name="PatentInfringementPayment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ContractsExpiryDateDescription" xbrli:periodType="duration" name="ContractsExpiryDateDescription" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_WeightedAverageRemainingContractualLifeYearsEndingBalance" xbrli:periodType="duration" name="WeightedAverageRemainingContractualLifeYearsEndingBalance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" />
  <xsd:element id="bcht_AggregateIntrinsicValueBeginningBalance" xbrli:periodType="duration" xbrli:balance="debit" name="AggregateIntrinsicValueBeginningBalance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_AggregateIntrinsicValueEnding" xbrli:periodType="duration" xbrli:balance="debit" name="AggregateIntrinsicValueEnding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_VestingDescription" xbrli:periodType="duration" name="VestingDescription" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_StockIssuedDuringPeriodSharesStockOptionsExercisedForCashless" xbrli:periodType="duration" name="StockIssuedDuringPeriodSharesStockOptionsExercisedForCashless" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_OptionValue" xbrli:periodType="instant" xbrli:balance="credit" name="OptionValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedVolatilityRatePercent" xbrli:periodType="duration" name="ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedVolatilityRatePercent" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" />
  <xsd:element id="bcht_StockBasedCompensationExpense" xbrli:periodType="duration" xbrli:balance="debit" name="StockBasedCompensationExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_StockIssuedForCashlessExerciseOfStockOptions" xbrli:periodType="duration" name="StockIssuedForCashlessExerciseOfStockOptions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_AggregateAmount" xbrli:periodType="instant" xbrli:balance="credit" name="AggregateAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_OptionToPurchaseShare" xbrli:periodType="duration" name="OptionToPurchaseShare" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_OptionexercisePrice" xbrli:periodType="instant" name="OptionexercisePrice" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_AdditionalSharesOfCommonStockToBeIssued" xbrli:periodType="duration" name="AdditionalSharesOfCommonStockToBeIssued" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_OptionExpiryTerm" xbrli:periodType="duration" name="OptionExpiryTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_MarketPricePerShare" xbrli:periodType="instant" name="MarketPricePerShare" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_OptionExercisePricePerShare" xbrli:periodType="instant" name="OptionExercisePricePerShare" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_RestrictedShareUnitSharesGranted" xbrli:periodType="duration" name="RestrictedShareUnitSharesGranted" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_ValueOfRestrictedCommonStock" xbrli:periodType="instant" xbrli:balance="credit" name="ValueOfRestrictedCommonStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_Expenses" xbrli:periodType="duration" xbrli:balance="debit" name="Expenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_NonQualifiedStockOptions" xbrli:periodType="duration" name="NonQualifiedStockOptions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_ExercisablePrice" xbrli:periodType="instant" name="ExercisablePrice" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisablesNumber" xbrli:periodType="duration" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisablesNumber" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingWeightedAverageExercisePrice" xbrli:periodType="instant" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingWeightedAverageExercisePrice" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionsGrantsInPeriodWeightedAverageExercisePrice" xbrli:periodType="duration" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionsGrantsInPeriodWeightedAverageExercisePrice" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionsExpirationsInPeriodWeightedAverageExercisePrice" xbrli:periodType="duration" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionsExpirationsInPeriodWeightedAverageExercisePrice" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionsExercisesInPeriodWeightedAverageExercisePrice" xbrli:periodType="duration" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionsExercisesInPeriodWeightedAverageExercisePrice" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_WeightedAverageExercisePriceExercisable" xbrli:periodType="duration" name="WeightedAverageExercisePriceExercisable" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_WeightedAverageRemainingContractualLifeYearsWarrantsBeginningBalance" xbrli:periodType="duration" name="WeightedAverageRemainingContractualLifeYearsWarrantsBeginningBalance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" />
  <xsd:element id="bcht_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueGrants" xbrli:periodType="duration" xbrli:balance="debit" name="SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueGrants" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueExpirations" xbrli:periodType="duration" xbrli:balance="debit" name="SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueExpirations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueExercised" xbrli:periodType="duration" xbrli:balance="debit" name="SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueExercised" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueExercisable" xbrli:periodType="duration" xbrli:balance="debit" name="SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueExercisable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_WarrantsWeightedAverageExercisePrice" xbrli:periodType="instant" name="WarrantsWeightedAverageExercisePrice" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_ExercisePriceWarrants" xbrli:periodType="instant" name="ExercisePriceWarrants" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_MarketAggregate" xbrli:periodType="instant" xbrli:balance="credit" name="MarketAggregate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_WarrantMarketPricePerShare" xbrli:periodType="instant" name="WarrantMarketPricePerShare" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_EffectiveIncomeTaxRateReconciliationOtherNonDeductibleItems" xbrli:periodType="duration" name="EffectiveIncomeTaxRateReconciliationOtherNonDeductibleItems" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" />
  <xsd:element id="bcht_IrcSection481AAdjustment" xbrli:periodType="instant" xbrli:balance="credit" name="IrcSection481AAdjustment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_NetOperatingLossCarryforwardExpiredAmount" xbrli:periodType="instant" xbrli:balance="debit" name="NetOperatingLossCarryforwardExpiredAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_OperatingLossCarryforwardsUnexpired" xbrli:periodType="instant" xbrli:balance="debit" name="OperatingLossCarryforwardsUnexpired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_OtherNoncashShippingExpense" xbrli:periodType="duration" xbrli:balance="credit" name="OtherNoncashShippingExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_OtherNonoperatingConsultingFeesExpense" xbrli:periodType="duration" xbrli:balance="debit" name="OtherNonoperatingConsultingFeesExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_GainLossChangeInFairValueOfProfitShare" xbrli:periodType="duration" xbrli:balance="credit" name="GainLossChangeInFairValueOfProfitShare" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_SegmentIncomeLoss" xbrli:periodType="duration" xbrli:balance="credit" name="SegmentIncomeLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_NoninterestsIncome" xbrli:periodType="duration" xbrli:balance="credit" name="NoninterestsIncome" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_CostsAndExpense" xbrli:periodType="duration" xbrli:balance="debit" name="CostsAndExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_IncomeLossFromContinuingOperationBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xbrli:periodType="duration" xbrli:balance="credit" name="IncomeLossFromContinuingOperationBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_RestatementOfPreviouslyIssuedFinancialStatementsAbstract" xbrli:periodType="duration" abstract="true" name="RestatementOfPreviouslyIssuedFinancialStatementsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_GoingConcernandFinancialConditionAbstract" xbrli:periodType="duration" abstract="true" name="GoingConcernandFinancialConditionAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_WarrantsAbstract" xbrli:periodType="duration" abstract="true" name="WarrantsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_SegmentAndGeographicInformationAbstract" xbrli:periodType="duration" abstract="true" name="SegmentAndGeographicInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_RestatementOfQuarterlyFinancialInformationAbstract" xbrli:periodType="duration" abstract="true" name="RestatementOfQuarterlyFinancialInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_FederalMember" xbrli:periodType="duration" abstract="true" name="FederalMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_StateAndLocalMember" xbrli:periodType="duration" abstract="true" name="StateAndLocalMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_USFederalMember" xbrli:periodType="duration" abstract="true" name="USFederalMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_StateMember" xbrli:periodType="duration" abstract="true" name="StateMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_SegmentAndGeographicInformationMember" xbrli:periodType="duration" abstract="true" name="SegmentAndGeographicInformationMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_ProductRevenueMember" xbrli:periodType="duration" abstract="true" name="ProductRevenueMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_LicenseRevenueMember" xbrli:periodType="duration" abstract="true" name="LicenseRevenueMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_DemonstrationsConsultingRevenueMember" xbrli:periodType="duration" abstract="true" name="DemonstrationsConsultingRevenueMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_EquipmentRevenueMember" xbrli:periodType="duration" abstract="true" name="EquipmentRevenueMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_WarrantsMember" xbrli:periodType="duration" abstract="true" name="WarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_LabEquipmentMember" xbrli:periodType="duration" abstract="true" name="LabEquipmentMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_ConsultingAgreementMember" xbrli:periodType="duration" abstract="true" name="ConsultingAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_DirectorsMember" xbrli:periodType="duration" abstract="true" name="DirectorsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_FirstCustomerMember" xbrli:periodType="duration" abstract="true" name="FirstCustomerMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_SecondCustomerMember" xbrli:periodType="duration" abstract="true" name="SecondCustomerMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_ThirdCustomerMember" xbrli:periodType="duration" abstract="true" name="ThirdCustomerMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_PurchaseMember" xbrli:periodType="duration" abstract="true" name="PurchaseMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_ThreeSuppliersMember" xbrli:periodType="duration" abstract="true" name="ThreeSuppliersMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_FourthCustomerMember" xbrli:periodType="duration" abstract="true" name="FourthCustomerMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_TruckingEquipmentMember" xbrli:periodType="duration" abstract="true" name="TruckingEquipmentMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_NotePayableRelatedPartyMember" xbrli:periodType="duration" abstract="true" name="NotePayableRelatedPartyMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_SeniorNoteMember" xbrli:periodType="duration" abstract="true" name="SeniorNoteMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_ACMidwestUnsecuredNoteMember" xbrli:periodType="duration" abstract="true" name="ACMidwestUnsecuredNoteMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_ProfitShareMember" xbrli:periodType="duration" abstract="true" name="ProfitShareMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_OfficeEquipmentComputerEquipmentAndSoftwaretMember" xbrli:periodType="duration" abstract="true" name="OfficeEquipmentComputerEquipmentAndSoftwaretMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_DakinMember" xbrli:periodType="duration" abstract="true" name="DakinMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_ACMidwestSubordinatedNoteMember" xbrli:periodType="duration" abstract="true" name="ACMidwestSubordinatedNoteMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_KayeCooperKayRosenbergLLPMember" xbrli:periodType="duration" abstract="true" name="KayeCooperKayRosenbergLLPMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_ACMidwestMember" xbrli:periodType="duration" abstract="true" name="ACMidwestMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_MEECMember" xbrli:periodType="duration" abstract="true" name="MEECMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_GreenbergEnterprisesMember" xbrli:periodType="duration" abstract="true" name="GreenbergEnterprisesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_CorsicanaWarehouseMember" xbrli:periodType="duration" abstract="true" name="CorsicanaWarehouseMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_JulyOneTwoZeroOneFiveMember" xbrli:periodType="duration" abstract="true" name="JulyOneTwoZeroOneFiveMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_CommercialCustomersMember" xbrli:periodType="duration" abstract="true" name="CommercialCustomersMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_CheifExecutiveOfficerMember" xbrli:periodType="duration" abstract="true" name="CheifExecutiveOfficerMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_TwoThousandSeventeenPlanMember" xbrli:periodType="duration" abstract="true" name="TwoThousandSeventeenPlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_BoardOfDirectorsMember" xbrli:periodType="duration" abstract="true" name="BoardOfDirectorsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_ChairmanOfTheBoardMember" xbrli:periodType="duration" abstract="true" name="ChairmanOfTheBoardMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_VicePresidentAndChiefTechnologyOfficerMember" xbrli:periodType="duration" abstract="true" name="VicePresidentAndChiefTechnologyOfficerMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_FebruaryTwentyThreeTwoThousandTwentyThreeMember" xbrli:periodType="duration" abstract="true" name="FebruaryTwentyThreeTwoThousandTwentyThreeMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_JuneSixTwoThousandTwentyThreeMember" xbrli:periodType="duration" abstract="true" name="JuneSixTwoThousandTwentyThreeMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_JuneSeventeenTwoThousandTwentyThreeMember" xbrli:periodType="duration" abstract="true" name="JuneSeventeenTwoThousandTwentyThreeMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_JuneTwentyEightTwoThousandTwentyTwoMember" xbrli:periodType="duration" abstract="true" name="JuneTwentyEightTwoThousandTwentyTwoMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_FormerEmployeeMember" xbrli:periodType="duration" abstract="true" name="FormerEmployeeMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_AccountsPayableAndAccruedExpensesMember" xbrli:periodType="duration" abstract="true" name="AccountsPayableAndAccruedExpensesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_FirstVendorsMember" xbrli:periodType="duration" abstract="true" name="FirstVendorsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_SecondVendorsMember" xbrli:periodType="duration" abstract="true" name="SecondVendorsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_BottomMember" xbrli:periodType="duration" abstract="true" name="BottomMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_TopMember" xbrli:periodType="duration" abstract="true" name="TopMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_AsRestatedMember" xbrli:periodType="duration" abstract="true" name="AsRestatedMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_AccumulatedDeficitMember" xbrli:periodType="duration" abstract="true" name="AccumulatedDeficitMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_AsRestatedQuarterlyMember" xbrli:periodType="duration" abstract="true" name="AsRestatedQuarterlyMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_ScenarioPreviouslyReportedQuarterlyMember" xbrli:periodType="duration" abstract="true" name="ScenarioPreviouslyReportedQuarterlyMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_RestatementAdjustmentQuarterlyMember" xbrli:periodType="duration" abstract="true" name="RestatementAdjustmentQuarterlyMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_GainsLossesOnModificationOfRelatedPartyDebt" xbrli:periodType="duration" xbrli:balance="credit" name="GainsLossesOnModificationOfRelatedPartyDebt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_SecuredNotesPayable" xbrli:periodType="instant" xbrli:balance="credit" name="SecuredNotesPayable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_RevenueFromContractWithCustomerProduct" xbrli:periodType="duration" xbrli:balance="credit" name="RevenueFromContractWithCustomerProduct" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_RevenueFromContractWithCustomerLicense" xbrli:periodType="duration" xbrli:balance="credit" name="RevenueFromContractWithCustomerLicense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_RevenueFromContractWithCustomerOther" xbrli:periodType="duration" xbrli:balance="credit" name="RevenueFromContractWithCustomerOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_GainLossOnChangeInFairValueOfProfitShareAndUnsecuredDebt" xbrli:periodType="duration" xbrli:balance="credit" name="GainLossOnChangeInFairValueOfProfitShareAndUnsecuredDebt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_StockIssuedForCashlessExerciseOfWarrantsShares" xbrli:periodType="duration" name="StockIssuedForCashlessExerciseOfWarrantsShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_StockIssuedForCashlessExerciseOfWarrantsAmount" xbrli:periodType="duration" xbrli:balance="credit" name="StockIssuedForCashlessExerciseOfWarrantsAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_StockIssuedForExerciseOfWarrantsShares" xbrli:periodType="duration" name="StockIssuedForExerciseOfWarrantsShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_StockIssuedForExerciseOfWarrantsAmount" xbrli:periodType="duration" xbrli:balance="credit" name="StockIssuedForExerciseOfWarrantsAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_StockIssuedForDeliveryOfRestrictedStockUnitsShares" xbrli:periodType="duration" name="StockIssuedForDeliveryOfRestrictedStockUnitsShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_StockIssuedForDeliveryOfRestrictedStockUnitsAmount" xbrli:periodType="duration" xbrli:balance="credit" name="StockIssuedForDeliveryOfRestrictedStockUnitsAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ProfitAndLoss" xbrli:periodType="duration" xbrli:balance="credit" name="ProfitAndLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ConsolidationEliminatedEntitiesOwnershipInterest" xbrli:periodType="instant" name="ConsolidationEliminatedEntitiesOwnershipInterest" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" />
  <xsd:element id="bcht_RevenueFromEnvironmentalProductsAndServices" xbrli:periodType="duration" xbrli:balance="credit" name="RevenueFromEnvironmentalProductsAndServices" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_EffectsOfDilutedSecuritiesStockOptions" xbrli:periodType="duration" name="EffectsOfDilutedSecuritiesStockOptions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_ModificationProfitShareLiabilityRelatedPartiesNet" xbrli:periodType="duration" xbrli:balance="debit" name="ModificationProfitShareLiabilityRelatedPartiesNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_OperatingLeaseLiabilityRightOfUseAsset" xbrli:periodType="instant" xbrli:balance="debit" name="OperatingLeaseLiabilityRightOfUseAsset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_CommonStockPurchaseShareAmount" xbrli:periodType="duration" xbrli:balance="debit" name="CommonStockPurchaseShareAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesPricePerShares" xbrli:periodType="duration" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesPricePerShares" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_StockIssuedDuringPeriodSharesShareBasedPaymentExerciseOfStockOptions" xbrli:periodType="duration" name="StockIssuedDuringPeriodSharesShareBasedPaymentExerciseOfStockOptions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_PurchaseSharesOfCommonStock" xbrli:periodType="duration" name="PurchaseSharesOfCommonStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExerciseDateFairValue" xbrli:periodType="duration" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExerciseDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_StockOptionClosingStockPrice" xbrli:periodType="instant" name="StockOptionClosingStockPrice" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" />
  <xsd:element id="bcht_ExpensesOnRestrictedStockUnitValue" xbrli:periodType="duration" xbrli:balance="debit" name="ExpensesOnRestrictedStockUnitValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriod" xbrli:periodType="duration" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element id="bcht_EmployeesBenefitsAndShareBasedCompensation" xbrli:periodType="duration" xbrli:balance="debit" name="EmployeesBenefitsAndShareBasedCompensation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_StockBasedCompensation" xbrli:periodType="duration" xbrli:balance="debit" name="StockBasedCompensation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_BasicMember" xbrli:periodType="duration" abstract="true" name="BasicMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_DilutedMember" xbrli:periodType="duration" abstract="true" name="DilutedMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_CommonSharesMember" xbrli:periodType="duration" abstract="true" name="CommonSharesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_SeniorVicePresidentAndChiefTechnologyOfficerMember" xbrli:periodType="duration" abstract="true" name="SeniorVicePresidentAndChiefTechnologyOfficerMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_TwoSuppliersMember" xbrli:periodType="duration" abstract="true" name="TwoSuppliersMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="bcht_DeferredOfferingCosts1" xbrli:periodType="instant" xbrli:balance="debit" name="DeferredOfferingCosts1" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_OperatingLeaseRightOfUseAssetsAndLiabilitiesTable" xbrli:periodType="duration" abstract="true" name="OperatingLeaseRightOfUseAssetsAndLiabilitiesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" />
  <xsd:element id="bcht_OperatingLeaseRightOfUseAssetAndLiabilitiesLineItems" xbrli:periodType="duration" abstract="true" name="OperatingLeaseRightOfUseAssetAndLiabilitiesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_BasicAndDilutedEarningsPerShareTable" xbrli:periodType="duration" abstract="true" name="BasicAndDilutedEarningsPerShareTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" />
  <xsd:element id="bcht_BasicAndDilutedEarningsPerShareLineItems" xbrli:periodType="duration" abstract="true" name="BasicAndDilutedEarningsPerShareLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="bcht_GainLossOnChangeInFairValueOfProfitShareAndUnsecuredNoteSource2" xbrli:periodType="duration" xbrli:balance="debit" name="GainLossOnChangeInFairValueOfProfitShareAndUnsecuredNoteSource2" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="bcht_OtherNoncashShippingExpenseSource2" xbrli:periodType="duration" xbrli:balance="debit" name="OtherNoncashShippingExpenseSource2" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="StockholdersEquityReverseStockSplitPolicyPolicyTextBlock" id="bcht_StockholdersEquityReverseStockSplitPolicyPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
</xsd:schema>
