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Hudson Technologies Inc./NY – ‘10-Q’ for 6/30/22 – ‘EX-101.SCH’

On:  Monday, 8/8/22, at 5:01pm ET   ·   For:  6/30/22   ·   Accession #:  1410578-22-2134   ·   File #:  1-13412

Previous ‘10-Q’:  ‘10-Q’ on 5/10/22 for 3/31/22   ·   Next:  ‘10-Q’ on 11/8/22 for 9/30/22   ·   Latest:  ‘10-Q’ on 11/7/23 for 9/30/23   ·   1 Reference:  By:  Hudson Technologies Inc./NY – ‘S-3’ on 1/13/23

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  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 8/08/22  Hudson Technologies Inc./NY       10-Q        6/30/22   53:5.2M                                   Toppan Merrill/FA2

Quarterly Report   —   Form 10-Q

Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q        Quarterly Report                                    HTML   1.21M 
 2: EX-31.1     Certification -- §302 - SOA'02                      HTML     22K 
 3: EX-31.2     Certification -- §302 - SOA'02                      HTML     22K 
 4: EX-32.1     Certification -- §906 - SOA'02                      HTML     18K 
 5: EX-32.2     Certification -- §906 - SOA'02                      HTML     18K 
11: R1          Document and Entity Information                     HTML     71K 
12: R2          Consolidated Balance Sheets                         HTML    116K 
13: R3          Consolidated Balance Sheets (Parenthetical)         HTML     38K 
14: R4          Consolidated Statements of Income                   HTML     95K 
15: R5          Consolidated Statements of Stockholders' Equity     HTML     56K 
16: R6          Consolidated Statements of Cash Flows               HTML    102K 
17: R7          Summary of Significant Accounting Policies          HTML     82K 
18: R8          Fair Value                                          HTML     20K 
19: R9          Inventories                                         HTML     30K 
20: R10         Property, plant and equipment                       HTML     61K 
21: R11         Leases                                              HTML     45K 
22: R12         Goodwill and intangible assets                      HTML     72K 
23: R13         Share-based compensation                            HTML     62K 
24: R14         Short-term and Long-term debt                       HTML     77K 
25: R15         Summary of Significant Accounting Policies          HTML    121K 
                (Policies)                                                       
26: R16         Summary of Significant Accounting Policies          HTML     44K 
                (Tables)                                                         
27: R17         Inventories (Tables)                                HTML     30K 
28: R18         Property, plant and equipment (Tables)              HTML     59K 
29: R19         Leases (Tables)                                     HTML     46K 
30: R20         Goodwill and intangible assets (Tables)             HTML     71K 
31: R21         Share-based compensation (Tables)                   HTML     57K 
32: R22         Short-term and Long-term debt (Tables)              HTML     55K 
33: R23         Summary of Significant Accounting Policies -        HTML     66K 
                Additional Information (Details)                                 
34: R24         Summary of Significant Accounting Policies -        HTML     37K 
                Summary of reconciliation of shares used to                      
                determine net loss per share (Details)                           
35: R25         Inventories (Details)                               HTML     23K 
36: R26         Property, plant and equipment - Summary of          HTML     76K 
                Elements of property, plant and equipment                        
                (Details)                                                        
37: R27         Property, plant and equipment - Additional          HTML     18K 
                Information (Details)                                            
38: R28         Leases - Maturity of lease payments (Details)       HTML     32K 
39: R29         Leases - Balance Sheet Classification and Other     HTML     31K 
                Information (Details)                                            
40: R30         Leases - Additional Information (Details)           HTML     24K 
41: R31         Goodwill and intangible assets - Company's other    HTML     41K 
                intangible assets (Details)                                      
42: R32         Goodwill and intangible assets - Additional         HTML     26K 
                Information (Details)                                            
43: R33         Share-based compensation - Summary of Status of     HTML     42K 
                Company's Stock Option Plan (Details)                            
44: R34         Share-based compensation - Weighted Average         HTML     28K 
                Contractual Life and Exercise Price (Details)                    
45: R35         Share-based compensation - Additional Information   HTML     60K 
                (Details)                                                        
46: R36         Short-term and long-term debt (Details)             HTML     34K 
47: R37         Short-term and long-term debt - Maturities of       HTML     30K 
                long-term debt and capital lease obligations                     
                (Details)                                                        
48: R38         Short-term and long-term debt - Additional          HTML    126K 
                Information (Details)                                            
51: XML         IDEA XML File -- Filing Summary                      XML     89K 
49: XML         XBRL Instance -- hdsn-20220630x10q_htm               XML   1.30M 
50: EXCEL       IDEA Workbook of Financial Reports                  XLSX    106K 
 7: EX-101.CAL  XBRL Calculations -- hdsn-20220630_cal               XML    138K 
 8: EX-101.DEF  XBRL Definitions -- hdsn-20220630_def                XML    333K 
 9: EX-101.LAB  XBRL Labels -- hdsn-20220630_lab                     XML    785K 
10: EX-101.PRE  XBRL Presentations -- hdsn-20220630_pre              XML    569K 
 6: EX-101.SCH  XBRL Schema -- hdsn-20220630                         XSD    114K 
52: JSON        XBRL Instance as JSON Data -- MetaLinks              283±   424K 
53: ZIP         XBRL Zipped Folder -- 0001410578-22-002134-xbrl      Zip    234K 


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<link:linkbaseRef xlink:type="simple" xlink:href="hdsn-20220630_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="hdsn-20220630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/>
<link:linkbaseRef xlink:type="simple" xlink:href="hdsn-20220630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/>
</xsd:appinfo>
</xsd:annotation>
<xsd:import namespace="http://xbrl.sec.gov/dei/2022" schemaLocation="https://xbrl.sec.gov/dei/2022/dei-2022.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://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd"/>
<xsd:import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd"/>
<xsd:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/>
<xsd:import namespace="http://fasb.org/us-roles/2022" schemaLocation="https://xbrl.fasb.org/us-gaap/2022/elts/us-roles-2022.xsd"/>
<xsd:import namespace="http://fasb.org/us-gaap/2022" schemaLocation="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd"/>
<xsd:import namespace="http://fasb.org/srt/2022" schemaLocation="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd"/>
<xsd:element id="hdsn_CostOfSalesExcludingCostOfNetRealizableValueAdjustment" name="CostOfSalesExcludingCostOfNetRealizableValueAdjustment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit"/>
<xsd:element id="hdsn_LowerOfCostOrNetRealizableValueAdjustment" name="LowerOfCostOrNetRealizableValueAdjustment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit"/>
<xsd:element name="NatureOfOperationsPolicyTextBlock" type="dtr-types:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hdsn_NatureOfOperationsPolicyTextBlock" substitutionGroup="xbrli:item"/>
<xsd:element id="hdsn_ScheduleOfOperatingLeaseInBalanceSheetClassificationTableTextBlock" name="ScheduleOfOperatingLeaseInBalanceSheetClassificationTableTextBlock" nillable="true" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/>
<xsd:element id="hdsn_ScheduleOfOperatingLeaseOtherInformationTableTextBlock" name="ScheduleOfOperatingLeaseOtherInformationTableTextBlock" nillable="true" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/>
<xsd:element name="SignificantAccountingPoliciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_SignificantAccountingPoliciesTable" substitutionGroup="xbrldt:hypercubeItem"/>
<xsd:element name="SignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_SignificantAccountingPoliciesLineItems" substitutionGroup="xbrli:item"/>
<xsd:element name="ExpirationPeriodAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_ExpirationPeriodAxis" substitutionGroup="xbrldt:dimensionItem"/>
<xsd:element name="ExpirationPeriodDomain" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_ExpirationPeriodDomain" substitutionGroup="xbrli:item"/>
<xsd:element name="CylindersMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_CylindersMember" substitutionGroup="xbrli:item"/>
<xsd:element name="BalanceSheetClassificationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_BalanceSheetClassificationAbstract" substitutionGroup="xbrli:item"/>
<xsd:element name="OtherInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_OtherInformationAbstract" substitutionGroup="xbrli:item"/>
<xsd:element name="StockOptionPlanMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_StockOptionPlanMember" substitutionGroup="xbrli:item"/>
<xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceAbstract" substitutionGroup="xbrli:item"/>
<xsd:element name="TwoThousandAndFourteenStockIncentivePlanMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_TwoThousandAndFourteenStockIncentivePlanMember" substitutionGroup="xbrli:item"/>
<xsd:element name="TwoThousandAndEighteenStockIncentivePlanMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_TwoThousandAndEighteenStockIncentivePlanMember" substitutionGroup="xbrli:item"/>
<xsd:element id="hdsn_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAggregateIntrinsicValueNonvested" name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAggregateIntrinsicValueNonvested" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit"/>
<xsd:element id="hdsn_LongtermDebtCurrentNetOfOtherDebt" name="LongtermDebtCurrentNetOfOtherDebt" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit"/>
<xsd:element name="TermLoanMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_TermLoanMember" substitutionGroup="xbrli:item"/>
<xsd:element name="FCCRMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_FCCRMember" substitutionGroup="xbrli:item"/>
<xsd:element name="SwingLineLoanMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_SwingLineLoanMember" substitutionGroup="xbrli:item"/>
<xsd:element id="hdsn_FixedChargesCoverageRatio" name="FixedChargesCoverageRatio" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/>
<xsd:element id="hdsn_LongTermDebtNonCurrentNetOfOtherDebt" name="LongTermDebtNonCurrentNetOfOtherDebt" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit"/>
<xsd:element id="hdsn_DebtInstrumentLeverageRatioRequired" name="DebtInstrumentLeverageRatioRequired" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/>
<xsd:element id="hdsn_OneCustomerMember" name="OneCustomerMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_NoCustomerMember" name="NoCustomerMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_AmendedAndRestatedRevolvingCreditAndSecurityAgreementMember" name="AmendedAndRestatedRevolvingCreditAndSecurityAgreementMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_DebtInstrumentAdditionalPercentagePointsInterest" name="DebtInstrumentAdditionalPercentagePointsInterest" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant"/>
<xsd:element id="hdsn_TermLoanFacilityMember" name="TermLoanFacilityMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_DebtPrepaymentPremiumPercentageYearTwo" name="DebtPrepaymentPremiumPercentageYearTwo" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant"/>
<xsd:element id="hdsn_DebtPrepaymentPremiumPercentageYearThree" name="DebtPrepaymentPremiumPercentageYearThree" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant"/>
<xsd:element id="hdsn_DebtPrepaymentPremiumPercentageYearFourAndThereafter" name="DebtPrepaymentPremiumPercentageYearFourAndThereafter" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant"/>
<xsd:element id="hdsn_CylinderDepositLiabilityPolicyTextBlock" name="CylinderDepositLiabilityPolicyTextBlock" nillable="true" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/>
<xsd:element id="hdsn_PropertyLocationAxis" name="PropertyLocationAxis" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_PropertyLocationDomain" name="PropertyLocationDomain" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_MinimumAggregateUndrawnLoanAvailability" name="MinimumAggregateUndrawnLoanAvailability" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit"/>
<xsd:element id="hdsn_IncreaseDecreaseInLeaseObligations" name="IncreaseDecreaseInLeaseObligations" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit"/>
<xsd:element id="hdsn_WellsFargoMember" name="WellsFargoMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_LineOfCreditFacilityCovenantComplianceMinimumLiquidityToBeDerivedFromAvailability" name="LineOfCreditFacilityCovenantComplianceMinimumLiquidityToBeDerivedFromAvailability" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit"/>
<xsd:element id="hdsn_PeriodForFixedChargeCoverageRatio" name="PeriodForFixedChargeCoverageRatio" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/>
<xsd:element id="hdsn_CylinderDepositValue" name="CylinderDepositValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit"/>
<xsd:element id="hdsn_CaresActLoanMember" name="CaresActLoanMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_PaycheckProtectionProgramMember" name="PaycheckProtectionProgramMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_DebtInstrumentInterestDeferralTerm" name="DebtInstrumentInterestDeferralTerm" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/>
<xsd:element id="hdsn_TwoThousandAndTwentyStockIncentivePlanMember" name="TwoThousandAndTwentyStockIncentivePlanMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueNonVested" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueNonVested" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant"/>
<xsd:element id="hdsn_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThree" name="LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThree" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit"/>
<xsd:element name="TwentyTwentyOneTermLoanFacilityMember" id="hdsn_TwentyTwentyOneTermLoanFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="SecuredOvernightFinancingRateMember" id="hdsn_SecuredOvernightFinancingRateMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="ApplicableLeverageRationMember" id="hdsn_ApplicableLeverageRationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="SecuredOvernightFinancingRatePlusApplicableLeverageRatioMember" id="hdsn_SecuredOvernightFinancingRatePlusApplicableLeverageRatioMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="PrincipalPaymentAsPercentageOfOriginalPrincipalAmountOfOutstandingTermLoanPerAnnum" id="hdsn_PrincipalPaymentAsPercentageOfOriginalPrincipalAmountOfOutstandingTermLoanPerAnnum" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="DebtPrepaymentPremiumPercentageYearOne" id="hdsn_DebtPrepaymentPremiumPercentageYearOne" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="DebtInstrumentPaymentExcessCashFlowAmount" id="hdsn_DebtInstrumentPaymentExcessCashFlowAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit"/>
<xsd:element name="RevolvingCreditFacilityAmendmentMember" id="hdsn_RevolvingCreditFacilityAmendmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="FirstInLastOutTrancheMember" id="hdsn_FirstInLastOutTrancheMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="SecuredOvernightFinancingRateAndFirstInLastOutTrancheMember" id="hdsn_SecuredOvernightFinancingRateAndFirstInLastOutTrancheMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="PrimeCommercialLendingRateOfWellsFargoMember" id="hdsn_PrimeCommercialLendingRateOfWellsFargoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="PercentageOfStepdownFromBaselineLevelsFinalRule" id="hdsn_PercentageOfStepdownFromBaselineLevelsFinalRule" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="PercentageOfCumulativeReductionFromBaselineLevelsSubsequentAllowance" id="hdsn_PercentageOfCumulativeReductionFromBaselineLevelsSubsequentAllowance" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="AllocationAllowanceReceivedByCompany" id="hdsn_AllocationAllowanceReceivedByCompany" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="AllocationAllowanceReceivedByCompanyAsPercentageOfHydrofluorocarbonsConsumption" id="hdsn_AllocationAllowanceReceivedByCompanyAsPercentageOfHydrofluorocarbonsConsumption" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="NetOperatingLoss" id="hdsn_NetOperatingLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit"/>
<xsd:element name="LongTermDebtFirstInLastOutFilo" id="hdsn_LongTermDebtFirstInLastOutFilo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit"/>
<xsd:element name="AmortizationOfDeferredFinancingCosts" id="hdsn_AmortizationOfDeferredFinancingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit"/>
<xsd:element name="AdjustmentsToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet" id="hdsn_AdjustmentsToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit"/>
<xsd:element name="ExcessTaxBenefitsFromShareBasedCompensationFinancingActivities" id="hdsn_ExcessTaxBenefitsFromShareBasedCompensationFinancingActivities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit"/>
<xsd:element name="PaymentsProtectionProgramForgiveness" id="hdsn_PaymentsProtectionProgramForgiveness" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit"/>
</xsd:schema>


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