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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2021-02-23T17:20:47.9625300+00:00 -->
<!-- Version            : 5.0.1.571 -->
<!-- Package ID         : 58970a4e6314409882b773e42238766b -->
<!-- Copyright (c) 2021 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="scl_NanjingStepanJinlingChemicalLimitedLiabilityCompanyMember" name="NanjingStepanJinlingChemicalLimitedLiabilityCompanyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_NonUSSubsidiariesMember" name="NonUSSubsidiariesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_ComputersEquipmentAndSoftwareMember" name="ComputersEquipmentAndSoftwareMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_SupplyContractsMember" name="SupplyContractsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_KnowHowMember" name="KnowHowMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_ConcentrationRiskNumberOfMajorCustomers" name="ConcentrationRiskNumberOfMajorCustomers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_ConcentrationRiskPaymentTerms" name="ConcentrationRiskPaymentTerms" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_AllowanceForDoubtfulAccountsReceivableChargeOffNetOfRecoveries" name="AllowanceForDoubtfulAccountsReceivableChargeOffNetOfRecoveries" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="scl_CapitalizedEnvironmentalExpendituresDepreciationPeriod" name="CapitalizedEnvironmentalExpendituresDepreciationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_TaxBenefitRecognizedThresholdLimitPercentage" name="TaxBenefitRecognizedThresholdLimitPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_NumberOfForeignSubsidiaries" name="NumberOfForeignSubsidiaries" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="scl_VolumeDerivativeContract" name="VolumeDerivativeContract" type="num:energyItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="scl_NotionalAmountOfUtilityContracts" name="NotionalAmountOfUtilityContracts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="scl_LongTermDebtWithoutDeferredLoanExpenses" name="LongTermDebtWithoutDeferredLoanExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="scl_DerivativeForeignCurrencyExchangeContractsDurations" name="DerivativeForeignCurrencyExchangeContractsDurations" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_SurfactantsMember" name="SurfactantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_PolymersMember" name="PolymersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_SpecialtyProductsMember" name="SpecialtyProductsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_CustomerListsAndRelationshipsMember" name="CustomerListsAndRelationshipsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesOneMember" name="UnsecuredPrivatePlacementNotesOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesTwoMember" name="UnsecuredPrivatePlacementNotesTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesThreeMember" name="UnsecuredPrivatePlacementNotesThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_DebtInstrumentsMaturityYear" name="DebtInstrumentsMaturityYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesMember" name="UnsecuredPrivatePlacementNotesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_MultiCurrencyRevolvingCreditAgreementMember" name="MultiCurrencyRevolvingCreditAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_UnsecuredBankDebtAndTermLoanInForeignCurrencyMember" name="UnsecuredBankDebtAndTermLoanInForeignCurrencyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_LineOfCreditFacilityMinimumMaturityPeriod" name="LineOfCreditFacilityMinimumMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_LineOfCreditFacilityMaximumMaturityPeriod" name="LineOfCreditFacilityMaximumMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_UnrestrictedRetainedEarnings" name="UnrestrictedRetainedEarnings" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="scl_AmountOfRepaymentsOfLongTermDebtDueInNextYear" name="AmountOfRepaymentsOfLongTermDebtDueInNextYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="scl_AmountOfRepaymentsOfForeignSubsidiariesShortTermDebtDueInNextYear" name="AmountOfRepaymentsOfForeignSubsidiariesShortTermDebtDueInNextYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="scl_InterestExpenseNetOfInterestIncome" name="InterestExpenseNetOfInterestIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="scl_RailcarsMember" name="RailcarsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_PercentageOfLeaseAssetCategories" name="PercentageOfLeaseAssetCategories" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_NumberOfCountriesLeasesReside" name="NumberOfCountriesLeasesReside" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="scl_PercentageOfValueOfLeasesProperty" name="PercentageOfValueOfLeasesProperty" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_IncrementsTerm" name="IncrementsTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_OtherLeaseInformationAbstract" name="OtherLeaseInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_OtherRetirementObligation" name="OtherRetirementObligation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="scl_EffectiveIncomeTaxRateReconciliationForeignTaxCreditExpenseBenefitRepatriationOfForeignEarnings" name="EffectiveIncomeTaxRateReconciliationForeignTaxCreditExpenseBenefitRepatriationOfForeignEarnings" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefits" name="EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefits" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercentage" name="EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_EffectiveNcomeTaxRateReconciliationForeignTaxCreditExpenseBenefitNondeductibleExpenses" name="EffectiveNcomeTaxRateReconciliationForeignTaxCreditExpenseBenefitNondeductibleExpenses" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccountsAndRebateReserves" name="DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccountsAndRebateReserves" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="scl_ReconciliationToBalanceSheetAbstract" name="ReconciliationToBalanceSheetAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_TaxCutsAndJobsActOf2017DeductionPercentageOfDividendsReceivedFromDistributionToEarningsPreviouslyTaxed" name="TaxCutsAndJobsActOf2017DeductionPercentageOfDividendsReceivedFromDistributionToEarningsPreviouslyTaxed" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_UnrecognizedTaxBenefitsReversedResultingFromSettlementsWithTaxingAuthorities" name="UnrecognizedTaxBenefitsReversedResultingFromSettlementsWithTaxingAuthorities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="scl_UnrecognizedTaxBenefitsIncreaseDecreasesResultingFromForeignCurrencyTranslation" name="UnrecognizedTaxBenefitsIncreaseDecreasesResultingFromForeignCurrencyTranslation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="scl_StockRepurchasedDuringPeriodSharesRelatedToWithholdingTaxesOfCancellationOfRestrictedStock" name="StockRepurchasedDuringPeriodSharesRelatedToWithholdingTaxesOfCancellationOfRestrictedStock" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_OpenMarketRepurchasesMember" name="OpenMarketRepurchasesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_EmployeeStockOptionGrantedPriorToTwoThousandAndSeventeenMember" name="EmployeeStockOptionGrantedPriorToTwoThousandAndSeventeenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_EmployeeStockOptionGrantedInTwoThousandAndSeventeenMember" name="EmployeeStockOptionGrantedInTwoThousandAndSeventeenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_StockAwardsMember" name="StockAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_StockAppreciationRightsSARSGrantedPriorToTwoThousandAndSeventeenMember" name="StockAppreciationRightsSARSGrantedPriorToTwoThousandAndSeventeenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_StockAppreciationRightsSARSGrantedInTwoThousandAndSeventeenMember" name="StockAppreciationRightsSARSGrantedInTwoThousandAndSeventeenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_IncreaseDecreaseInMarketValueOfCommonStock" name="IncreaseDecreaseInMarketValueOfCommonStock" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_DecreaseInMarketValueOfCommonStock" name="DecreaseInMarketValueOfCommonStock" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="scl_StockAppreciationRightsLiabilitiesNoncurrent" name="StockAppreciationRightsLiabilitiesNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="scl_IncreaseDecreaseInMarketPriceOfCommonStockDueToDeferredCompensation" name="IncreaseDecreaseInMarketPriceOfCommonStockDueToDeferredCompensation" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_PensionPlansPostretirementAndOtherEmployeeBenefitsLineItems" name="PensionPlansPostretirementAndOtherEmployeeBenefitsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_PensionPlansPostretirementAndOtherEmployeeBenefitsTable" name="PensionPlansPostretirementAndOtherEmployeeBenefitsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_PeriodicBenefitCostAndOtherComprehensiveIncome" name="PeriodicBenefitCostAndOtherComprehensiveIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="scl_DefinedBenefitPlanPercentageOfPrecedingYearAssetGainOrLossConsideredToCalculateExpectedReturnOnPlanAssets" name="DefinedBenefitPlanPercentageOfPrecedingYearAssetGainOrLossConsideredToCalculateExpectedReturnOnPlanAssets" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_DefinedBenefitPlanPercentageOfSecondPrecedingYearAssetGainOrLossConsideredToCalculateExpectedReturnOnPlanAssets" name="DefinedBenefitPlanPercentageOfSecondPrecedingYearAssetGainOrLossConsideredToCalculateExpectedReturnOnPlanAssets" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_DefinedBenefitPlanPercentageOfThirdPrecedingYearAssetGainOrLossConsideredToCalculateExpectedReturnOnPlanAssets" name="DefinedBenefitPlanPercentageOfThirdPrecedingYearAssetGainOrLossConsideredToCalculateExpectedReturnOnPlanAssets" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_DefinedBenefitPlanPercentageOfFourthPrecedingYearAssetGainOrLossConsideredToCalculateExpectedReturnOnPlanAssets" name="DefinedBenefitPlanPercentageOfFourthPrecedingYearAssetGainOrLossConsideredToCalculateExpectedReturnOnPlanAssets" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_EmployerEquitySecuritiesMember" name="EmployerEquitySecuritiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_InsuranceContractsMember" name="InsuranceContractsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_USFixedIncomeSecuritiesMember" name="USFixedIncomeSecuritiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_DefinedBenefitPlanNumberOfCommonSharesSoldToEsopTrust" name="DefinedBenefitPlanNumberOfCommonSharesSoldToEsopTrust" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="scl_EquitySecuritiesPooledPensionFundsMember" name="EquitySecuritiesPooledPensionFundsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_FixedIncomePooledPensionFundsMember" name="FixedIncomePooledPensionFundsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetChangeInUnrealizedGainLoss" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetChangeInUnrealizedGainLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="scl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisForeignExchangeImpact" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisForeignExchangeImpact" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="scl_PercentageOfExpectedLongTermRateOfReturnOnPlanAssets" name="PercentageOfExpectedLongTermRateOfReturnOnPlanAssets" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_PercentageOfPremiumEstimatedReturnForEquitiesAndPropertiesToRiskFreeRate" name="PercentageOfPremiumEstimatedReturnForEquitiesAndPropertiesToRiskFreeRate" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_PercentageOfLongTermReturnInCash" name="PercentageOfLongTermReturnInCash" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_ExpectedPaymentRelatedToNonqualifiedPlanInNextFiscalYear" name="ExpectedPaymentRelatedToNonqualifiedPlanInNextFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="scl_RetirementContributionsMember" name="RetirementContributionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_ProfitSharingContributionsMember" name="ProfitSharingContributionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_BalanceOfTrustAssets" name="BalanceOfTrustAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="scl_SupplementalExecutiveRetirementPlanLiability" name="SupplementalExecutiveRetirementPlanLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="scl_StatutoryPlansMember" name="StatutoryPlansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_PercentageOfUnionAndNonUnionEmployeesEligibleForEitherStatutoryOrCompanysSponsoredProfitSharingContributions" name="PercentageOfUnionAndNonUnionEmployeesEligibleForEitherStatutoryOrCompanysSponsoredProfitSharingContributions" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_PercentageOfUSBasedUnionAndNonUnionEmployeesEligibleForEitherStatutoryOrCompanysSponsoredProfitSharingContributions" name="PercentageOfUSBasedUnionAndNonUnionEmployeesEligibleForEitherStatutoryOrCompanysSponsoredProfitSharingContributions" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_EnvironmentalAndLegalMattersLiabilitiesNonCurrent" name="EnvironmentalAndLegalMattersLiabilitiesNonCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="scl_WilmingtonSiteMember" name="WilmingtonSiteMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_SiteContingencyMaximumFutureResponseCostPercentage" name="SiteContingencyMaximumFutureResponseCostPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_PaymentsForSiteContingencies" name="PaymentsForSiteContingencies" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="scl_UnallocatedCorporateExpense" name="UnallocatedCorporateExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="scl_UnallocatedCorporateAssets" name="UnallocatedCorporateAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="scl_UnallocatedCorporateExpenditures" name="UnallocatedCorporateExpenditures" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="scl_UnallocatedCorporateDepreciationExpenses" name="UnallocatedCorporateDepreciationExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="scl_ScheduleOfGeographicalSegmentsLineItems" name="ScheduleOfGeographicalSegmentsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_ScheduleOfGeographicalSegmentsTable" name="ScheduleOfGeographicalSegmentsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_AllOtherCountriesMember" name="AllOtherCountriesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_UnvestedStockAwardsMember" name="UnvestedStockAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_OptionsAndStockAppreciationRightsMember" name="OptionsAndStockAppreciationRightsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_PaymentOfValueAddedTax" name="PaymentOfValueAddedTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="scl_ClariantMexicoMember" name="ClariantMexicoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_LogosTechnologiesAssetAcquisitionMember" name="LogosTechnologiesAssetAcquisitionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_TrademarksAndKnowHowMember" name="TrademarksAndKnowHowMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_LaboratoryEquipmentMember" name="LaboratoryEquipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_TwoThousandAndNineteenAcquisitionMember" name="TwoThousandAndNineteenAcquisitionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_OilfieldDemulsifierProductLineMember" name="OilfieldDemulsifierProductLineMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_ProductKnowHowMember" name="ProductKnowHowMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_BASFMexicanaSADECVMember" name="BASFMexicanaSADECVMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_BusinessCombinationCapacityOfProductionFacilityExpectedToBeAcquired" name="BusinessCombinationCapacityOfProductionFacilityExpectedToBeAcquired" type="num:massItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="scl_BusinessCombinationAreaOfSpaceExpectedToBeAcquired" name="BusinessCombinationAreaOfSpaceExpectedToBeAcquired" type="num:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="scl_TwoThousandNineteenRestructuringMember" name="TwoThousandNineteenRestructuringMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_EarlyTerminationOfLeaseExpensesMember" name="EarlyTerminationOfLeaseExpensesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_TwoThousandEighteenRestructuringMember" name="TwoThousandEighteenRestructuringMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_AssetAndSparePartMember" name="AssetAndSparePartMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_CumulativeDecommissioningCostsMember" name="CumulativeDecommissioningCostsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_DecommissioningCostsMember" name="DecommissioningCostsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_TwoThousandSeventeenRestructuringMember" name="TwoThousandSeventeenRestructuringMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_FieldsboroNewJerseyMember" name="FieldsboroNewJerseyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_TwoThousandSixteenRestructuringMember" name="TwoThousandSixteenRestructuringMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_LongfordMillsMember" name="LongfordMillsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_InsuranceRecoveryLineItems" name="InsuranceRecoveryLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_InsuranceRecoveryTable" name="InsuranceRecoveryTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_NumberOfCustomersClaims" name="NumberOfCustomersClaims" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_LossContingencyClaimsReversedNumber" name="LossContingencyClaimsReversedNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_NoncashOrPartNoncashInvestingActivitiesPayablesIncurredForPropertyPlantAndEquipmentExpendituresUnpaid" name="NoncashOrPartNoncashInvestingActivitiesPayablesIncurredForPropertyPlantAndEquipmentExpendituresUnpaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="scl_NoncashFinancingActivitiesIncludesSharesIssued" name="NoncashFinancingActivitiesIncludesSharesIssued" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="scl_SupplementalCashFlowElementsLineItems" name="SupplementalCashFlowElementsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_SupplementalCashFlowElementsTable" name="SupplementalCashFlowElementsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_StockAwardPlanMember" name="StockAwardPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="scl_NumberOfManufacturingSites" name="NumberOfManufacturingSites" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="scl_FermentationPlantAcquisitionMember" name="FermentationPlantAcquisitionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</xsd:schema>
