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1、Separationofacetonitrile-ethylacetatebyextractivedistillationwithmixedsolventLiChunli1,ZongLili2andFangJingSchoolofChemicalEngineering,HebeiUniversityofTechnology,Tianjin,30013E-mail:lichunli_hebut@126.com,Tel:+86-022-60202246AbstractComputer-aidedmoleculardesign(CAMD)approachwasbringinthi
2、sworkforselectingextractivesolvents.Theseparationofacetonitrile-ethylacetateAzeotropicsystemwascarriedoutthroughabatchextractivedistillationprocesseswithN,N-dimethylformamide(DMF),glycol(EG)andDMF-EGmixtureassolventsseparately.Theeffectsofdifferentoperatingconditionswerestudied,solvents,ra
3、tioofmixedsolvent,solventflowrateandrefluxratiowereallincluded.ItwasfoundthatthemixedsolventDMF-EGshowedbetterseparationeffectthanthesinglesolvent.Thebestproportionofthemixedsolventwas3:7(thequalityofDMFandEG);whenthesolventflowrateandrefluxratioincreased,theseparationeffectofmixedsolventi
4、mproved;undertheconditionsthatsolventflowratewas20mL/min,refluxratiowas2,qualityfractionofethylacetateinthetopproductcouldreach99.62%.KeywordsSeparation;Batchextractivedistillation;Mixedsolvents;Acetonitrile;Ethylacetate1.IntroductionAcetonitrileandethylacetatearewidelyusedinchemicalandpha
5、rmaceuticalindustriesaschemicalrawmaterialsandgoodorganicsolvent[1].Butthetwoformazeotrope,ethylacetatehold77%andtheother23%isacetonitrile(massfraction),commondistillationmethodcannotmakeanyeffect.Therefore,somecompanieshavetotreatthemaswaste,thisnotonlycauseseriouslywasteofresourcesandeco
6、nomy,butalsopollutetheenvironment.Atpresent,DiJiandong[2]ofTianjinuniversityhasrealizedtheseparationofacetonitrile-ethylacetatebyheterogeneousbatchazeotropicdistillation,buttheproductreceivedinthiswayhavelowerpurity,buthighenergyconsumption.Accordingtothedifferenceofsolubilitythatacetonitr
7、ileandethylacetateinthewater,MaWenchan[3]adoptsthemethodofliquid-liquidextractivewhichusewaterasextractiveagenttoseparateacetonitrile-ethylacetate,theproductofethylacetatecanachieve98.5%,butacetonitrilemixedwithabundantwater,sorecoveryofacetonitrileisverydiffi
