二次刮膜法制备处理石化污水聚偏氟乙烯复合膜

377July201720177ModernChemicalIndustry*100013SEM、XXPS。PMMAPVDFPMMA12%20μmNMP/PVDF/PMMA/PVP74/16/4/6。PVDF0.1MPa628.1L/h·m253.7°168.3L/h·m20.2～0.6NTU。TQ028．8A0253－4320201707－0133－05DOI10．16606/j．cnki．issn0253－4320．2017．07．031PreparationofPVDFcompositemembranebytwicecastingmembranemethodYANGLi*WEIXinYANGYong-qiangXIZhen-yuSINOPECBeijingＲesearchInstituteofChemicalIndustryBeijing100013ChinaAbstractCompositionofcoatingsolutionandthicknessofcastingmembraneinformingacouplinglayerbythefirsttimecastingmembranearestudiedandthecastingsolutionformulaandmaking-membranetechniqueofthesecondtimecastingmembraneisalsostudied．ThecompositionandstructureofmembranearecharacterizedbyscanningelectronmicroscopySEMXrayphotoelectronspectroscopyXPSetc．FirstlythroughthecompatibilityexperimentsofpolymerblendspolymethylmethacrylatePMMAisscreenedoutasthecouplinglayerpolymerbetweenthesupportlayerpolyesternon-wovenfabricandpolyvinylidenefluoridePVDFcastingsolution．ItisconfirmedthatthemassconcentrationofPMMAinthecoatingsolutionoffirsttimecastingmembraneis12%andthethicknessofcastingmembraneis20μm．ThenthesolutionformulaofthesecondtimecastingmembraneisoptimizedasNMP/PVDF/PMMA/PVP=74/16/4/6masspercent．ThePVDFflatcompositeultrafiltrationmembranepreparedbythetwicecastingmethodhasahighmechanicalstrengthandstronganti-backwashingability．WithPVDFasthebulkmaterialitcanremainpurewaterfluxsteadyat628.1L·h·m2－1under0.1MPawhenthecontactangleis53.7°．Havingbeenusedintheactualoperationofpetrochemicalwastewatertreatmentforonemonththeaveragemembranewaterfluxisabout68.3L·h·m2－1andtheturbidityofproductionwaterisbasicallystablebetween0.2NTUand0.6NTU．Thesurfaceofmembraneislesspollutantshowingastronganti-pollutionability．Keywordspolyvinylidenefluorideflatcompositemembranetwicecastingmembranehydrophilicityrei[e-mail]。PVDF、N－NMP/1－6。PVDF、7－8PVDF。PVDF9－13。、、。、。PVDF。PVDFPVDFPVDF。PVDFPVDF/PVP/NMP14－15。·331·37711.1PVDF、PSFPMMA、PC、PEIN－NMP40000PVPK30。1.2PVDFNMPPVDFNMP24hTU－1901NMP。1.3PMMANMPPVDF、NMP60℃24h、112、。1.40.15MPa30min0.1MPa、DSA100KＲSSGmbHGermanyESCALAB250XThermoFisherUSAXL－30FEIUSAINSTＲON2712－020USA。22.1。16－17。PVDF。、PMMAPVDF118－19。PMMAPVDFPMMA。1—PSF2—PC3—PEI4—PMMA1PVDF2.2PVDF。NMPPMMAPVDFPVPNMP/PVDF/PVP78/16/6150μm1.3PVDF。·431·2017723。1—2—21—2—3220μm3PMMAPMMA12%。PMMA12%20μm。2.3PMMAPMMA、PVDF。PMMA。PVDFPMMA20%NMP74%PVP6%。PVDFPMMAPMMA12%20μm150μm24h1。PMMAPVDFSEM4。1PMMAmPMMA/mPVDF/L·h·m2－1/°/MPa/MPa0.05256.199.72.832.80.08312.375.32.932.10.11368.968.23.029.40.18457.377.32.828.60.21589.257.92.626.40.25616.756.22.526.70.29639.751.02.325.10.33662.945.82.224.9amPMMA/mPVDF=0.05bmPMMA/mPVDF=0.11cmPMMA/mPVDF=0.25dmPMMA/mPVDF=0.334PMMAPVDFSEM1PMMA4PMMA/PVDF4d。、·531·377PVDFPMMAmPMMA/mPVDF≤0.25。2.4PVDFPVDF21～3PVDF4PVDF1、45。5。2PVDF。2PVDF/L·h·m2－1/°/MPa1mPVDF/mPMMA/mPVP/mNMP=16/4/6/74628.153.72.52mPVDF/mPMMA/mPVP/mNMP=16/2/4/78482.360.32.53mPVDF/mPMMA/mPVP/mNMP=18/2/6/74393.865.92.54mPVDF/mPVP/mNMP=16/4/80297.284.31.8、、PVDFNMP/PVDF88/1220μmNMP/PVDF/PMMA/PVP74/16/4/6150μm0.1MPa628.1L/h·m253.7°2.5MPa、。ab5PVDFSEMXPS6a。C1s、F1sO1sC、O、FC1s、O1s、F1s6b～6d。29.35eV6c2285.8、290.5eVPVDFC—HC—FPVDF。aXPSbFlscClsdOls6XPSF1s、C1s、O1s2.5PVDFPVDFPLC7、、。·631·201771—PVDF2—PVDF7PVDF7PVDF168.3L/h·m242.6L/h·m2。PVDF0.2～0.6NTUEDI。1PVDF。PVDF、、。31PMMAPVDF。2、PVDFNMP/PVDF88/1220μmNMP/PVDF/PMMA/PVP74/16/4/6150μmPVDF0.1MPa628.1L/h·m253.7°。3PVDF168.3L/h·m20.2～0.6NTU。1ChaBJYangJM．PreparationofpolyvinylidenefluoridehollowfibermembreanesformicrofiltrationusingmodifiedTIPSprocessJ．JMembrSci20072911/2191－198．2ChengLP．EffectoftemperatureontheformationofmicroporousPVDFmembranesbyprecipitationfrom1-octanol/DMF/PVDFandwater//DMF/PVDFsystemsJ．Macromolecules199932206668－6674．3KongJLiK．Oilremovalfromoil-in-wateremulsionsusingPVDFmembranesJ．SepPurifTechnol199916183－93．4ChaeSＲYamamuraHIkedaKetal．Comparisonoffoulingchar-acteristicsoftwodifferentpoly-vinylidenefluoridemicrofiltrationmembranesinapilot-scaledrinkingwatertreatmentsystemusingpre-coagulation/sedimentationsandfiltrationandchlorinationJ．WaterＲesearch2008428/92029－2042．5TanXiaoyaoTanSPTeoWKetal．PolyvinylidenefluoridePVDFhollowfibremembranesforammoniaremovalfromwaterJ．JournalofMembraneScience20062711/259－68．6．J．201434880－83．7ZhaoChuanqiXuXiaochenChenJieetal．EffectofgrapheneoxideconcentrationonthemorphologiesandantifoulingpropertiesofPVDFultrafiltrationmembranesJ．JournalofEnvironmentalChemicalEngineering201313349－354．8LadnerDAVardonDＲClarkMM．Effectsofshearonmicrofil-trationandultrafiltrationfoulingbymarinebloom-formingalgaeJ．JournalofMembraneScience2010356133－43．9．PVDF/CAJ．20022264－8．10OchoaNAMasuelliMMarcheseJ．Effectofhydrophilicityonfoul-ingofanemulsifiedoilwastewaterwithPVDF/PMMAmembranesJ．JMembrSci2003226203－211．11．/J．200020510－15．12LiNanaXiaoChangfaAnShulinetal．PreparationandpropertiesofPVDF/PVAhollowfibermembranesJ．Desalination20102502530－537．13．J．201232417－20．14KhayetMFengCYKhulbeKCetal．Preparationandcharacter-izationofpolyvinylidenefluoridehollowfibermembranesforultrafil-trationJ．Polymer2002433879－389