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1、162Ind.Eng.Chem.Res.2003,42,162-174SeparationofaMinimum-BoilingAzeotropeinaBatchExtractiveRectifierwithanIntermediate-BoilingEntrainerEndreReÂv,*ZoltaÂnLelkes,ViktoÂriaVarga,CsabaSteÂger,andZsoltFonyoÂChemicalEngineeringDepartment,BudapestUniversityofTechnologyandEconomics,H-1521Buda
2、pest,HungaryTheseparationofminimum-boilingazeotropesisfeasibleusingbatchextractivedistillation(BED)inarectifyingcolumnwithanintermediate-boilingentrainer.ThemaindifferencebetweenBEDandsolvent-enhancedbatchdistillation(SBD)istheapplicationofcontinuousentrainerfeedingeithertothecolumno
3、rtothestill.Ourtestmixture,selectedaccordingtodidacticviewpoints,ismethylacetateandcyclohexanewithcarbontetrachloride.Operationsteps(sequencing),limitingflows,andlimitingnumbersofstagesaredeterminedbyafeasibilitystudybasedonprofilemaps;thedesignisvalidatedbyrigoroussimulation.Results
4、ofparametricstudiesandacomparisonofSBDandBEDintermsofeffectivenessarepresented.Thestudiedparametersarethenumbersofstages,therefluxratio,thefeedratio,andthecolumnhold-up.Theseparationofminimum-boilingazeotropesinSBDwithanintermediate-boilingentrainerispracticallyinfeasible.Theapplicat
5、ionofcontinuousfeeding(characteristicofBED)makestheprocessfeasible.Ourtestentraineristhermodynamicallyratherwellbehaved.IntroductionSeveralsuggestionscanbefoundintheliteratureforseparatingminimum-boilingbinaryazeotropesusinganentrainer.AccordingtoLarocheetal.,1theentrainerforhomoazeo
6、tropicdistillationcanbethelightest,theheaviest,oreventheintermediate-boilingcomponentinthesystem.Forhomoazeotropicbatchdistillation,Bernotetal.2andRodriguez-Donisetal.3discussedtheselectionofappropriateentrainers.Evenheteroazeo-tropicdistillationcanbeused;see,forexample,Rod-riguez-Do
7、nisetal.4Findinganintermediate-boilingentrainerthatworkswellismoredifficultthanfindingeitheraheavyoraFigure1.Batchstripper.lightentrainer,andasaresult,theintermediate-boilingentrainerthatisactuallyfoundmightbeinferiortotheothers.Ontheotherhand,agoodintermediate-boilingentrainerhasmer
8、itscomparedt
