aspenbatch间歇精馏模拟.docx

aspenbatch间歇精馏模拟.docx

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aspenbatch间歇精馏模拟

Aspen间歇精馏模拟教程

UsethisGettingStartedsectiontobecomefamiliarwiththestepstosetupabatchsimulationusingAspenBatchModeler.

Youwillbemodelingasystemtorecovermethanolfromamixtureofmethanolandwater.

Theobjectiveistoseparatemethanolfromthemixturewithapurityof99%.Thismixtureisnotidealgiventhepolarityofthemolecules;therefore,foraworkingpressureof1atm,youwillchooseNRTLtomodelitsphysicalproperties.

Therearefourstepsinthisprocess.Clickasteptogotheinstructionsforthestep.Step1–SetupthePropertiesforAspenBatchModeler

Step2–EnterstructuraldataandspecificationsfortheAspenBatchModelerblockStep3–EnterOperatingSteps

Step4–Runthesimulationandviewtheresults

Step1-SetupthePropertiesforAspenBatchModeler

WewanttodefineaPropertiesfilethathasthefollowingdefined.

ComponentsPropertyMethod

WaterNRTL

Methanol

TodefinethisPropertiesfile,followthestepsbelow.

TosetuptheProblemDefinitionfilefromwithinAspenBatchModeler:

1.StartAspenBatchModeler.

2.OntheSpeciesform,clickEditUsingAspenProperties.

ThiswillstartAspenProperties.

3.EntertheComponents:

ComponentID

Componentname

Formula

WATER

WATER

H2O

METHANOL

METHANOL

CH4O

Tip:

YoucanusetheNextbutton

4.ClicktheNextbuttonPropertiesSpecificationsform.

5.OnthePropertiesSpecificationsform,inthePropertymethodfield,selectNRTL.Tip:

Clickingthepull-downarrowonthefieldandtypingN（thefirstletteroftheproperty

methodname）takesyoutotherightchoicemuchfasterthanjustscrollingdownthelonglist.

6.ClickNext

Youaretakentothebinaryparametersforms,whereyoucanviewthebinaryparametersthatwillbeusedforPropertiesCalculations.

7.ClickNext

Youarepromptedtoclickoneoftheoptionsshownbelow.

8.Thereisnoneedforfurtherinput,soclickOKtorunthepropertysetup.

9.CloseAspenPropertiesbyclickingFile|Exit.

Youarepromptedwiththefollowing:

10.ClickYestosavethefile.

ThePropertysetupisnowcomplete.

Step2-EnterstructuraldataandspecificationsfortheAspenBatchModelerblock

Thecolumnhasbeendesignedasfollows:

Configuration

10Stages（thisincludeseighttrays,condenserandpot）Vapor-liquidseparation

PotGeometryEllipticalhead1mdiametervolumeof1m3

Overhead

TotalCondenser

Distillatemoleflowrate=4.5kmol/hrRefluxdrumispresent

（noneedtoenterdimensionbecausewearedefiningfixedpressureprofile/holdups;thereforerefluxholdupwillbeentered）

Pressure/HoldupsPressureprofileisfixed

Condenserpressure1.01325barColumnPressureDrop0.1bar

Holdups

RefluxDrumliquidholdup:

0.02m3Stageholdup:

0.005m3

HeatTransfer

Duty:

150kW

Receivers

OnereceiverforliquiddistillateInitialcondition:

totalrefluxInitialConditions

InitialCharge18kmolofmaterial

ComponentmolefractionMethanol:

0.4

Water:

0.6

ToEntertheData

1.SettheconfigurationtoBatchDistillationColumn,specifythenumberofstagesandensurevalidphasesareVapor-LiquidontheConfigurationMainform

10Stages（thisincludeseighttrays,condenser,andpot）Vapor-liquidseparation

2.OntheSetup|PotGeometrytab,typethepotdimensions:

Elliptical;1mdiameter;volumeof1m3

3.ClicktheOverheadform.OntheCondensertab,clickTotalforTotalcondenser.

4.OntheRefluxtab,typethedistillatemoleflowrate:

Distillatemoleflowrate=4.5kmol/hrRefluxdrumispresent

Note:

Youneednotenterdimensionbecausewearedefiningfixedpressureprofile/holdups.Therefore,refluxholdupwillbeentered.

5.ClicktheJacketHeatingformunderSetup.OntheJacketHeatingtab,enterthepotconditions:

Duty:

150kW

6.ClickPressure/Holdups|Pressure.

7.OnthePressuretab,typethepressureprofile:

Pressureprofileisfixed.

Condenserpressure1.01325barColumnPressureDrop0.1bar

8.OntheHoldupstab,typetherefluxandstageholdupinformation:

3

RefluxDrumliquidholdup:

0.02mStageholdup:

0.005m3

9.ClickReceivers|Distillate.

10.OntheDistillatetab,defineoneliquiddistillatereceiver.

11.ClickInitialConditions|Main.

12.OntheMaintab,intheInitialconditionfield,clickTotalreflux.

13.OntheInitialChargetab,definethefollowing:

Totalinitialcharge:

18kmolofmaterialComponentmolefraction:

Methanol:

0.4

Water:

0.6

Note:

Donotforgettosaveyourworkregularly.

Tosaveyourfileforthefirsttime:

1.OntheFilemenu,clickSaveAs.

2.IntheFilenamefield,typeaname,orselectafilenametooverwriteanexistingfile:

3.ClickSave.

Step3-EnterOperatingSteps

TherearetwoOperatingSteps:

1.Startproductdrawmaintainingadistillateflowrateof4.5kmol/hr.

2.Stopwhenthemolefractionofwaterinthedistillatereceiverapproaches0.01frombelow.Thebatchiscomplete.

Tocreatetherequiredoperatingstepstoruntheproblem:

1.ClickOperatingStepsandenterdistilintheNamecolumnoftheOperatingStepstable.

Thiswillcreatethefirstoperatingstepdistil.

2.OntheChangedParameterstab,createanoperatingsteptodistillthemethanolbymaintainingadistillateflowrateof4.5kmol/hr.

3.OntheEndConditiontab,specifyastheendconditionthemolefractionofwaterinthedistillatereceiverapproachingthevalueof0.01frombelow.

Step4-Runthesimulationandviewtheresults

Thesimulationisnowreadytorun.

Beforerunningthesimulation,itisagoodideatocreateplotsforkeyvariablessuchas:

thecompositionandholdupintheReceiver

thecompositionandtemperatureinthepotandsoon

Tocreateplotsforkeyvariables:

1.OnthePlotsform,clicktheTemperatureandCompositiontocreatetimeplotsforpottemperatureandmolefractions.

2.UsetheCustomplotsfeaturetocreateplotsofthereceiverholdupsandcompositions.ClickNewontheCustomplotstableandspecifyH2O_distilasthenameoftheplot.

3.GototheHoldupsSummaryResults\Distillatetab.SelectthefieldthatdisplaystheWATERmolefractionanddragitontotheplot（H2O_distil）createdinthepreviousstep.

4.Usethesameapproachtocreateplotsofholdupsinthereceiverand/ortheplot.

5.YoucanchangethetimeunitsdisplayedintheplotsbyclickingtheRunOptionstoolbar

buttonSelectthetimeunitsinwhichtheuserinterfaceshoulddisplaytimefield.

14.ClicktheRunbuttonandviewtheSimulationMessageswindowforanyrelevant

messages.

Oncetheproblemhasrunsuccessfullyyoucanviewresultsintheforms.

Batchtime:

1.49hours/89.4minutesPottemperature:

101.05℃Methanolrecovery:

6.636kmol

Note:

Itisalwaysgoodpracticetorestartyoursimulationinordertorestoreittotimezerobeforesavingyourwork.