滲透汽化膜的結構及動態(tài)分離過程的關系研究.pdf

1、浙江理工大學碩士學位論文滲透汽化膜的結構及動態(tài)分離過程的關系研究姓名：張振南申請學位級別：碩士專業(yè)：應用化學指導教師：張偉王新平20081221浙江理工人學碩士學位論文AbstractExcellentseparationpropertyanddesirablepervaporationstabilityarethepremiseofindustrialapplicationsofpervaporationmembranesAccord

2、ingtosolution—diffusionmodel，thesurfaceandbulkstructuresofamembraneplayavitalroleinitspermeabilityandselectivityHowevertheexacteffectofmembranesurfaceandbulkonitspervaporationperformanceincludingfluxandseparationselectiv

3、ityisnotclearwhichisunfavorablefortheestablishmentofaproperpervaporationmodelMeanwhile，polymersurfaceisadynamicsurface、訪廿ltimeandenvironmentaldependence，andthefunctionalgroupsorsegmentsofpolymersCallreorientorreconstruct

4、themselvesatthesurfacesinaccordance、骯ⅡlthenatureoftheirsurroundingenvironmentInpervaporationseparation，polymericmembranesareutilizedtoseparatevariousfeedmixtures，consequentlytheircontactingenvironmentisoftenchanging，whic

5、hoftenresultsinthevarianceofmembranesurfacestructuresInadditiontheabsorptionandswellingoffeedmixturesinthemembranesduringpervaporationoperationaredynamicprocessNamelymanyfactorsarecontributedtosuchdynamicseparationproces

6、sAdeeperinsightintothedynamicseparationprocessisveryimportantforbetterunderstandingtheseparationmechanism，andalsoforthecontrolandoptimizationofpervaporationperformance1Inthispaperasimplemethod，surfacesegregationwasemploy

7、edforthesurfacemodificationofpoly(vinylalcoh01)(PVA)membrane，apromisingcandidateforindustrialapplicationThePVAsolutioncontainingsmallamountofpoly(acrylicacid)(PAA)Wascastrespectivelyontwosubstrates、析mdifferentpolaritysuc

8、hglassplateandpoly(tetrafluoroethylene)(PTFE)plate，andfinallytwomembranes、Ⅳithdifferentbulkstructuresandsimilarsurfacestructureswereformedbythesurface—inductionofsubstratesTheeffectofthecontentandmolecularweightofPAA，and

9、surfacepropertyofthesubstrateonthepervaporationperformanceofthePAAsurface—modifiedPVAmembranefortheseparationofacid／watermixtureswasinvestigatedItWasfoundthatthewaterselectivitytowardacid／watermixturesWasenhancedwhenthes

10、urfaceofPVAmembraneWasmodifiedbyPAAthroughsurfacesegregationExamplefortheseparationof90wt％acid／watermixturesat40“CwhentheglasssideWasincontactwithfeedmixturesduringpervaporation，fluxWasincreasedfrom108to128#m2handthewate