aspen plus应用基础(ii-d)new

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1、PhysicalPropertiesObjectives:IntroducetheideasofpropertymethodsandphysicalpropertyparametersIdentifyissuesinvolvedinthechoiceofapropertymethodCovertheuseofPropertyAnalysisforreportingphysicalpropertiesAspenPlusReferences:UserGuide,Chapter7,PhysicalPropertyMethodsU

2、serGuide,Chapter8,PhysicalPropertyParametersandDataUserGuide,Chapter29,AnalyzingPropertiesCaseStudy-AcetoneRecovery•Correctchoiceofphysicalpropertymodelsandaccuratephysicalpropertyparametersareessentialforobtainingaccuratesimulationresults.OVHDSpecification:FEEDCO

3、LUMN99.5mole%acetonerecovery5000lbmol/hr10mole%acetone90mole%waterBTMSIdealEquationofActivityCoefficientApproachStateApproachModelApproachPredictednumberof11742stagesrequiredApproximatecostindollars520,000390,000880,000HowtoEstablishPhysicalPropertiesChooseaProper

4、tyMethodCheckParameters/ObtainAdditionalParametersConfirmResultsCreatetheFlowsheetPropertyMethods•APropertyMethodisacollectionofmodelsandmethodsusedtocalculatephysicalproperties.•PropertyMethodscontainingcommonlyusedthermodynamicmodelsareprovidedinAspenPlus.•Users

5、canmodifyexistingPropertyMethodsorcreatenewones.PhysicalPropertyModels•ApproachestorepresentingphysicalpropertiesofcomponentsPhysicalPropertyModelsIdealEquationofStateActivitySpecial(EOS)CoefficientModelsModelsModels•Choiceofmodeltypesdependsondegreeofnon-idealbeh

6、aviorandoperatingconditions.Idealvs.Non-IdealBehavior•Whatdowemeanbyidealbehavior?y–IdealGaslawandRaoult’slaw•Whichsystemsbehaveasideal?x–Non-polarcomponentsofsimilarsizeandshape•Whatcontrolsdegreeofnon-ideality?–Molecularinteractionse.g.Polarity,sizeandshapeofthe

7、molecules•Howcanwestudythedegreeofnon-idealityofasystem?–Propertyplots(e.g.TXY&XY)yyxxComparisonofEOSandActivityCoefficientModelsEquationofStateActivityCoefficientModelGoodforvaporphasemodelingandGoodforliquidphasemodelingonlyliquidsoflowpolarityLimitedinabilityto

8、representnon-Canrepresenthighlynon-idealliquidsidealliquidManybinaryparametersrequiredFewerbinaryparametersrequiredBinaryparametersarehighlyParametersex