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  <xs:element id="acnt_LesseeSubleaseAnnualBaseRent" abstract="false" name="LesseeSubleaseAnnualBaseRent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_LesseeSubleaseAnnualRateIncrease" abstract="false" name="LesseeSubleaseAnnualRateIncrease" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="acnt_LeasesWeightedAverageDiscountRateAbstract" abstract="true" name="LeasesWeightedAverageDiscountRateAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="acnt_WeightedAverageRemainingLeaseTermAbstract" abstract="true" name="WeightedAverageRemainingLeaseTermAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="acnt_EmployeeBenefitPlansAccruedExpenses" abstract="false" name="EmployeeBenefitPlansAccruedExpenses" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_AccruedWasteDisposalCurrent" abstract="false" name="AccruedWasteDisposalCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_AmendedShareRepurchaseProgramMember" abstract="true" name="AmendedShareRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_StockRepurchaseProgramTerm" abstract="false" name="StockRepurchaseProgramTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="acnt_ShareRepurchaseProgramMember" abstract="true" name="ShareRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_SharesWithheldFromEmployeesMember" abstract="true" name="SharesWithheldFromEmployeesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_PreviousShareRepurchaseProgramMember" abstract="true" name="PreviousShareRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_NewShareRepurchaseProgramMember" abstract="true" name="NewShareRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_RestrictedStockAwardsMember" abstract="true" name="RestrictedStockAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_PerformanceStockUnitsWithPerformanceAndServiceConditionMember" abstract="true" name="PerformanceStockUnitsWithPerformanceAndServiceConditionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_PerformanceStockUnitsWithMarketConditionsMember" abstract="true" name="PerformanceStockUnitsWithMarketConditionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_A2011PlanMember" abstract="true" name="A2011PlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_A2015StockAwardsPlanMember" abstract="true" name="A2015StockAwardsPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_NonEmployeeDirectorMember" abstract="true" name="NonEmployeeDirectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_CommitteeAxis" abstract="true" name="CommitteeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="acnt_CommitteeDomain" abstract="true" name="CommitteeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_AuditCommitteeMember" abstract="true" name="AuditCommitteeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_CompensationCommitteeMember" abstract="true" name="CompensationCommitteeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_NominatingAndCorporateGovernanceCommitteeMember" abstract="true" name="NominatingAndCorporateGovernanceCommitteeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_ShareBasedPaymentArrangementNonvestedAwardCostNotYetRecognizedAmountAmountRecognizedYearOne" abstract="false" name="ShareBasedPaymentArrangementNonvestedAwardCostNotYetRecognizedAmountAmountRecognizedYearOne" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_ShareBasedPaymentArrangementNonvestedAwardCostNotYetRecognizedAmountAmountRecognizedThereafter" abstract="false" name="ShareBasedPaymentArrangementNonvestedAwardCostNotYetRecognizedAmountAmountRecognizedThereafter" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestingPeriodStartPeriodAfterGrant" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestingPeriodStartPeriodAfterGrant" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="acnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTargetPeriodAchievementForVesting" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTargetPeriodAchievementForVesting" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="acnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualElectedRetainerFeesPercent" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualElectedRetainerFeesPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="acnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodVolumeWeightedAveragePriceTarget" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodVolumeWeightedAveragePriceTarget" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="acnt_EffectiveIncomeTaxRateReconciliationStateValuationAllowanceAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationStateValuationAllowanceAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_EffectiveIncomeTaxRateReconciliationDomesticValuationAllowanceAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationDomesticValuationAllowanceAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_EffectiveIncomeTaxRateReconciliationStateValuationAllowancePercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationStateValuationAllowancePercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="acnt_EffectiveIncomeTaxRateReconciliationDomesticValuationAllowancePercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationDomesticValuationAllowancePercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="acnt_IncomeTaxDisclosuresTable" abstract="true" name="IncomeTaxDisclosuresTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="acnt_IncomeTaxDisclosuresLineItems" abstract="true" name="IncomeTaxDisclosuresLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="acnt_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsInventoryValuationReserves" abstract="false" name="DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsInventoryValuationReserves" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_DeferredTaxAssetsLeaseLiabilities" abstract="false" name="DeferredTaxAssetsLeaseLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_InterestLimitationCarryforwards" abstract="false" name="InterestLimitationCarryforwards" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_DeferredTaxLiabilityRightofUseAssets" abstract="false" name="DeferredTaxLiabilityRightofUseAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_InterestLimitationCarryforwardsAndOtherCarryforwards" abstract="false" name="InterestLimitationCarryforwardsAndOtherCarryforwards" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_EarningsPerShareNumeratorAbstract" abstract="true" name="EarningsPerShareNumeratorAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="acnt_EarningsPerShareDenominatorAbstract" abstract="true" name="EarningsPerShareDenominatorAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="acnt_SpecialtyChemicalsSegmentMember" abstract="true" name="SpecialtyChemicalsSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_CostOfOtherMaterialAdjusted" abstract="false" name="CostOfOtherMaterialAdjusted" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_OtherOperatingAndNonoperatingIncomeExpense" abstract="false" name="OtherOperatingAndNonoperatingIncomeExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_IdentifiableAssetsAdjusted" abstract="false" name="IdentifiableAssetsAdjusted" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_AllOtherCountriesMember" abstract="true" name="AllOtherCountriesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_A401kEmployeeStockOwnershipPlanMember" abstract="true" name="A401kEmployeeStockOwnershipPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_DanChemPlanMember" abstract="true" name="DanChemPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="acnt_DefinedContributionPlanAdditionalAnnualContributionPerEmployeeMinimumAgeUnderEconomicGrowthAndTaxReliefReconciliationAct" abstract="false" name="DefinedContributionPlanAdditionalAnnualContributionPerEmployeeMinimumAgeUnderEconomicGrowthAndTaxReliefReconciliationAct" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="acnt_DefinedContributionPlanAdditionalAnnualContributionPerEmployeeAmountUnderEconomicGrowthAndTaxReliefReconciliationAct" abstract="false" name="DefinedContributionPlanAdditionalAnnualContributionPerEmployeeAmountUnderEconomicGrowthAndTaxReliefReconciliationAct" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="acnt_DefinedContributionPlanMaximumAnnualContributionPerEmployeeAmountUnderEconomicGrowthAndTaxReliefReconciliationAct" abstract="false" name="DefinedContributionPlanMaximumAnnualContributionPerEmployeeAmountUnderEconomicGrowthAndTaxReliefReconciliationAct" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
