減壓膜蒸餾法分離含鉻水溶液的研究.pdf

1、重慶大學(xué)碩士學(xué)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(xué)位級別：碩士專業(yè)：物理化學(xué)指導(dǎo)教師：陶長元20000601重慶大學(xué)碩士學(xué)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