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  <xs:element id="kwr_AcquisitionRelatedFairValueAdjustmentsRelatedToInventory" abstract="false" name="AcquisitionRelatedFairValueAdjustmentsRelatedToInventory" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kwr_CapitalExpendituresReductionInAccrualButNoCashImpact" abstract="false" name="CapitalExpendituresReductionInAccrualButNoCashImpact" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kwr_MultiemployerPlanPlanLiabilities" abstract="false" name="MultiemployerPlanPlanLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kwr_RealEstateFundMember" abstract="true" name="RealEstateFundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kwr_KoreaHoughtonCoporationMember" abstract="true" name="KoreaHoughtonCoporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kwr_VestingSharesTargetLowerPercent" abstract="false" name="VestingSharesTargetLowerPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="kwr_NonoperatingCharges" abstract="false" name="NonoperatingCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kwr_CombinationAndOtherAcquisitionRelatedExpensesNetOfPayments" abstract="false" name="CombinationAndOtherAcquisitionRelatedExpensesNetOfPayments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kwr_DefinedContributionPlanMember" abstract="true" name="DefinedContributionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kwr_AmericasSegmentMember" abstract="true" name="AmericasSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
