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1、时光荏苒，岁月如白驹过隙，不经意间，我们即将从多彩的大学毕业，完成一个从大学生到社会人的转变。四年的大学生涯，让我明白了许许多多的科学知识和人生哲理，以及数不尽的感悟和成长。然只有将所学的理论知识付诸于社会的实践，才能检验和实现理论自身的价值，也只有将理论付诸于实践才能使理论得以检验。同样，一个人的价值也是通过实践活动来实现的，也只有通过实践才能锻炼人的品质，彰显人的时代风貌。而毕业实习作为大学的最后一课，也是最后一刻，我倍加珍惜，从而可以较深层次的理解社会，以便为将来能更好的胜任工作打下坚实的基础。Separationofacetonitrile-ethylaceta
2、tebyextractivedistillationwithmixedsolventLiChunli1,ZongLili2andFangJingSchoolofChemicalEngineering,HebeiUniversityofTechnology,Tianjin,30013E-mail:lichunli_hebut@126.com,Tel:+86-022-AbstractComputer-aidedmoleculardesign(CAMD)approachwasbringinthisworkforselectingextractivesolvents.These
3、parationofacetonitrile-ethylacetateAzeotropicsystemwascarriedoutthroughabatchextractivedistillationprocesseswithN,N-dimethylformamide(DMF),glycol(EG)andDMF-EGmixtureassolventsseparately.Theeffectsofdifferentoperatingconditionswerestudied,solvents,ratioofmixedsolvent,solventflowrateandref
4、luxratiowereallincluded.ItwasfoundthatthemixedsolventDMF-EGshowedbetterseparationeffectthanthesinglesolvent.Thebestproportionofthemixedsolventwas3:7(thequalityofDMFandEG);whenthesolventflowrateandrefluxratioincreased,theseparationeffectofmixedsolventimproved;undertheconditionsthatsolvent
5、flowratewas20mL/min,refluxratiowas2,qualityfractionofethylacetateinthetopproductcouldreach99.62%.KeywordsSeparation;Batchextractivedistillation;Mixedsolvents;Acetonitrile;Ethylacetate1.IntroductionAcetonitrileandethylacetatearewidelyusedinchemicalandpharmaceuticalindustriesaschemicalrawm
6、aterialsandgoodorganicsolvent[1].Butthetwoformazeotrope,ethylacetatehold77%andtheother23%isacetonitrile(massfraction),commondistillationmethodcannotmakeanyeffect.Therefore,somecompanieshavetotreatthemaswaste,thisnotonlycauseseriouslywasteofresourcesandeconomy,butalsopollutetheenvironment
7、.Atpresent,DiJiandong[2]ofTianjinuniversityhasrealizedtheseparationofacetonitrile-ethylacetatebyheterogeneousbatchazeotropicdistillation,buttheproductreceivedinthiswayhavelowerpurity,buthighenergyconsumption.Accordingtothedifferenceofsolubilitythatacetonitrileandethylacet
