Preparation of Polyethersulfone Ultrafiltration Tubur Membranes with

www.ccsenet.org/masModernAppliedScienceVol.4,No.10;October2010PublishedbyCanadianCenterofScienceandEducation47PreparationofPolyethersulfoneUltrafiltrationTuburMembraneswithSuperiorPropertiesJunLiuTianjinPolytechnicUniversity,Tianjin300160,ChinaTel:86-22-2452-8226E-mail:sdliujun08@163.comAbstractPhaseinversionviaimmersionprecipitationwasemployedforPEStubularmembranepreparationandusingN,N-dimethylacetamide(DMAc)assolvent,PEG-400asmainconstantadditive.ThroughtheexperimentalstudyweobtainapreparationprocessofPEStubularmembranewithsuperiorproperties.Ethanolcausedanincrementinthefluxatlowcoagulationbathtemperaturerelativetothenon-ethanol.Andthelowtemperatureofcoagulationbathalsoimprovemembrane’srejectionanditsinfluencewasmostimportant.Otherconditionsincludedthatthecastingsolutiontemperaturemustnotbetoohigh(15℃wasbest)andthemembranedon’tbeexposedtoatmosphereinlongtime.Thepreparedmembraneunderthisconditionshowsexcellentperformanceonfluxandretention.Testresultsshowthatthefluxcanbeupto160L·m-2h-1andtherejectioncanreachmorethan97%(forovalbvmin)underthiscondition.Thefluxwasincreasedclearlycomparetonon-ethanolandhightemperature.Keywords:Membrane,Polyethersulfone,Ultrafiltartio,AdditivesIntroductionGenerally,polysulfone(PSF)andpolyethersulfone(PES)arewidelyusedforthepreparationofmicrofiltration(MF),ultrafiltration(UF)andgasseparationmembranes.Besides,theyareprincipallytothefavorablecharacteristicsofwidetemperaturelimits,widepHtolerances,fairlygoodchlorineresistance,easytofabricatemembranesinawidevarietyofconfigurationsandmodules,widerangeofporesizesavailableforUFandMFapplicationsrangingfrom10Åto0.2umandgoodchemicalresistancetoaliphatichydrocarbons,alcoholsandacids.Thecommontechniqueforthepreparationofasymmetricultrafiltrationmembranesisthephaseinversionmethod.Membraneformationoccursinaveryshorttimeandinvolvesagreatnumberofelementarysteps.However,morelikelyinsomesystems,afeworonemechanismisimportant,soitisworthwhiletolookforsomeconsistencorrelationbetweenasingleparameterandtheobtai