關于鹽效應及其在分離過程中的應用的研究.pdf

1、天津大學博士學位論文關于鹽效應及其在分離過程中的應用的研究姓名：潘曉梅申請學位級別：博士專業(yè)：分離工程指導教師：楊志才20021201ABCTRACTSevernfieldsofsalteffectWaSstudiedbytheoreticalanalysisandexperimenttomeettheneedofseparationtaskinchemicalengineeringprocessTheyare：Saltselectio

2、n；SalteffectonVLEandLLE；“SaltDistillation—SaltExtraction’combinedseparationprocessForabinarysystem，sincegeneralinteractionbetweenasaltandasolventWaSexpressedbytheproductoftheeffectforcekbetweenthesaltandthesolvent，whichc

3、omesfromthecorrelationoftheexperimentdataofdepressingofvaporpressureofsolutionwithsalt，andthesolubilityofthesaltS’inthesolvent，SOforabinarysolutionthecriteriaofsaltselectionWaSdescribedasthedifferenceofthegeneralinteract

4、ionbetweenasaltandtwosolventsinthesolution，thatis：V=lks2占2一ksl黽ITwokindsofmodelsincorrelationofdataofVLEandLLEofbinarysystemundersalteffectwereofferedAsforVLEthefirstl[indofmodeIisbaSedonFurterequationTheTWilsonequationw

5、asintroducedandmodifiedtodescribebinarysystemVLEtheoretically，whichbelongstothesecondkindmodelAsforLLE，thefirstkindofmodelis：也edifferenceofthedistributioncoe伍cientbeforeandafteraddingsalttothesolutionWaScorrelatedwithsal

6、tconcentrationinwaterlayernlesecondkindofmodelis：electrolyteNRTL(MNRTL)modelwasusedtocalculateLLEdatatheoreticallyIngeneralthefirstkindofmethodsaresimpleandmeaningful，andthesecondkindofmodelsaremoreaccurateandusefulinpro

7、cesssimulationAnewprocesscombiningazeotropedistillationandsaltextractionthatpurifiestheorganicsolventfromtheirazeotropeswitllwaterWasprecededAnoveltower、ⅣimasaltextractorandamiddlevesselWaSproposedWaterCanbegotawaybothfr

8、ombosomandoverheadoftoweratthesalTletime，andtheorganicsolventwasconcentratedinthetowerandaccumulatedinthemiddlevesselatlastSotheprogresswastime—shortedandenergysavedandtheconcentrmionofproductWaSupto999％andtheproductyiel

9、d995％ThenewprocessWaSstudiedexperimentallyandsimulatedbyconstantmolarholdupmodelAtlast，recoveryofsaltfromitsaqueouswasstudiedby“extractivecrystallization”processKeywords：saltextraction；middlevessel；azeotrope；acetonitrile