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1、重慶大學碩士學位論文減壓膜蒸餾法分離含鉻水溶液的研究姓名:劉作華申請學位級別:碩士專業(yè):物理化學指導教師:陶長元20000601重慶大學碩士學位論文AbstractABSTRACTPoly(vinylidenefluoride)(PVDF、resinisaIlidealmembranematerialformembranedistillationwiththepropertiesincludingeasypreparationand90

2、0dhydrophobicityThemechanismandthepreparationprocessofthePVDFmicroporousmembranebyphaseinversionwerestudiedinthispapernlemechanismsofheatandmasstransfersinmembranecastingprocessaswellasthefactorsassociatedwiththemembrane

3、qualitywereinvestigatedTheresultsdenotedthattheoptionalprocessformembranepreparationwerethatcastingsolutionsmaturingat6080“Cfor懶castingontheplainglassthenimmersingintothecoagulationsolutionsimmediatelytoformmembranenlepo

4、rosiliesofpreparedandcommercialmembranesweredeterminedbywetmembranemethodthecharacteris6csofthemembranesincludingmaxilnutrlporesizeaverageporesizeandtheporesizedistributionweremeasuredonGTLDMembranePoreDeterminationInstr

5、umentTheresultsindicatedthatthemaximumporesizeandtheporosityofthecommercialmembraneswereapproximatetothoseofpreparedmembranesrespectively帆iletheporesizedistributionsofthecommercialmembraneswlrebetterthanthatoftheprepared

6、onesinthattheseparationperformancesofthecommercialmembranesWelesuperiortothatofpreparedonesAsetofvacuummembranedistillationf~W皿1experimentalapparatuswagassembledtoseparatetheaqueouschromiumsolutionsTheprocessconditionswe

7、reinvestigatedandtheop缸mlseparati_【3nconditionsweredbIa嘲Undertheoptimalprocessconditions,intheseparationofCr3solutions,therejectionratiosofthepreparedmembraneswereover50%whilethemembranefluxesofthetwokindsofmembraneswere

8、over40kgm。血1IntreatingtheaqueousC,solutionstherejectionratioswereover9925%,whilemembranefluxesgett03452kgm2h’At諳trealrnentofCr“aqueoussolutionsrangingfrom50mgZLto100mg/L,thedischargesCallreachthecriteriacontrollingopnlee

9、xlx:aimentalresultsshowedthatwiththeincreasingofthefeedratethelaminarlayerbecomesthinnertheconcentrationandtemperaturepolarizationgetssmallerwhichcouldconlributetotheheatandmasstransferSOmembranefluxesandrejectionratiosw

10、eiebothimprovedThedrivingforceinVMDincludestemperatureandpressuredifferencesofllansmembraneV●Ⅱ)isanewkindofseparationtechnologyItisofgreatapplicationresearchvalueKeywords:vaCllHID_membranedistillation(VMD),PVDF,chromiuma

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