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  <xsd:element id="scl_RevolvingCreditFacilityAndTermLoanBorrowingMember" name="RevolvingCreditFacilityAndTermLoanBorrowingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SeriesTwoThousandAndTwentyTwoANotesMember" name="SeriesTwoThousandAndTwentyTwoANotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SeriesTwoThousandAndTwentyTwoBNotesMember" name="SeriesTwoThousandAndTwentyTwoBNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SpecialtyProductsMember" name="SpecialtyProductsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_StockAwardPlanMember" name="StockAwardPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SurfactantsMember" name="SurfactantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_TwoThousandAndTwentyOneAcquisitionMember" name="TwoThousandAndTwentyOneAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredBankDebtInForeignCurrencyMember" name="UnsecuredBankDebtInForeignCurrencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesFiveMember" name="UnsecuredPrivatePlacementNotesFiveMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesFourMember" name="UnsecuredPrivatePlacementNotesFourMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesMember" name="UnsecuredPrivatePlacementNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesOneMember" name="UnsecuredPrivatePlacementNotesOneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesSevenMember" name="UnsecuredPrivatePlacementNotesSevenMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesSixMember" name="UnsecuredPrivatePlacementNotesSixMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesThreeMember" name="UnsecuredPrivatePlacementNotesThreeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesTwoMember" name="UnsecuredPrivatePlacementNotesTwoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_WilmingtonSiteMember" name="WilmingtonSiteMember" type="dtr-types:domainItemType" 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_AssetAcquisitionAndBusinessCombinationTextBlock" name="AssetAcquisitionAndBusinessCombinationTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_ScheduleOfOperatingLeasesWeightedAverageRemainingLeaseTermAndDiscountRateTableTextBlock" name="ScheduleOfOperatingLeasesWeightedAverageRemainingLeaseTermAndDiscountRateTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodTableTextBlock" name="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
</xsd:schema>
