Aspenplus案例教程－苯加氢生产环己烷.pdf

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1、AspenPlusTutorial1:HydrogenationofBenzeneHydrogenationofbenzeneisusedtoproducecyclohexaneintheprocessshowedbelow.Thisexampleistypicalofamodeldevelopedforpreliminaryprocessflowsheet§evaluation.Freshbenzeneandmake-uphydrogenaremixedwithrecyclehydrogenandrecyclecyclohexanefromtheprocessandfedtoafixe

2、d-bedcatalyticreactor.Inthereactor,thereactionisC6H6+3H2C6H12Theheatreleasedfromthishighlyexothermicreactionisremovedbyboilingwateroutsidetubescontainingthecatalystpellets.Thereactoreffluentiscooledandseparatedintoliquidandvaporphases.Theliquidphaseisfedtoadistillationcolumntoremovethedissolvedli

3、ghtendsandtostabilizetheliquidproduct.Partoftheliquidfromtheseparatorisrecycledtothereactortoaidintemperaturecontrol.Onceaflowsheetsimulationmodeloftheprocessisdeveloped,itcanbeusedtoinvestigatetheeffectofthecyclohexanerecyclerateontheheatloadfromthereactor.Wecanalsostudytheeffectofthepurgerateon

4、thebuildupofinertcomponentsinthesystem.Fornow,youjustneedtoputtheflowsheettogether.UsetheRedlich-Kwong-Soave(RK-SOAVE)propertymethodinthesimulation.Theinputdataarelistedasfollows:§ThedescriptionhereistakenverbatimfromanoldAspenManual.Whenyouwriteareport,youneedtomakeadecisionifthedescriptionshoul

5、dincludeexplicitlytheunitandstreamlabels.Roughly,wedonotifwearejustmakingageneralconceptiondescription.Otherwise,wedoifwearewritingatechnicaldescriptionoftheprocessandhowitisdesigned.FeedStreamsComposition(MolePercent)FreshBenzeneMake-upHydrogenHydrogen-97.5Nitrogen-0.5Methane-2.0Benzene100.0-Flo

6、wrate(lb-mol/h)100300(estimate*)Temperature(°F)100120Pressure(psia)15335*Theflowofmake-uphydrogenshouldbesettoobtainamoleratioofhydrogentobenzeneequalto3.3inthefeedtothereactorFeedPumpCentrifugalpumpOutletpressure(psia)335FeedPreheaterOutlettemperature(°F)300Pressuredrop(psi)5ReactorStoichiometry

7、:asstatedintheprocessdescriptionConversion99.8percentconversionofbenzeneinfeedOutlettemperature(°F)400Pressuredrop(psi)15ProductCoolerOutlettemperature(°F)120Pressuredrop(psi)5SeparatorHeatlossnegligiblePressuredropneg