界面聚合工艺条件对反渗透复合膜性能的影响_邱实

第59卷第8期化工学报Vol.59No.82008年8月JournalofChemicalIndustryandEngineering(China)August2008研究论文界面聚合工艺条件对反渗透复合膜性能的影响邱实1,吴礼光2,张林1,陈欢林1,高从堦1,3(1浙江大学材料与化工学院,浙江杭州310027;2浙江工商大学环境科学与工程学院,浙江杭州310035;3国家液体分离膜工程技术研究中心,浙江杭州310012)摘要:以聚砜超滤膜为支撑膜,间苯二胺(MPD)为水相功能单体,均苯三甲酰氯(TMC)为油相功能单体,通过界面聚合法制备了反渗透复合膜。研究了功能单体浓度、界面聚合反应时间、界面聚合成膜后热处理时间和温度等条件对复合膜分离性能的影响;并对在水相中添加相转移催化剂对复合膜分离性能的影响和相转移催化机理进行了初步探讨。首先在单因素实验条件下确定工艺条件的优化范围,然后经过正交实验得到最佳工艺条件,实验结果表明,油相中TMC浓度为3g·L-1、水相中MPD浓度为20g·L-1、界面聚合反应时间为30s、界面聚合成膜后热处理温度为90℃、后处理时间15min时,所制备的反渗透复合膜表现出良好的分离性能,通量达14.91L·m-2·h-1,截留率为0.951(测试条件:压力1.6MPa,温度25℃,NaCl浓度20000mg·L-1);当水相中MPD浓度较低时,加入适量的相转移催化剂,能有效地改善膜的分离性能。关键词:间苯二胺;均苯三甲酰氯;界面聚合;反渗透复合膜中图分类号:TQ028.8文献标识码:A文章编号:0438-1157(2008)08-2027-08EffectofprocessconditionsofinterfacialpolymerizationonperformanceofreverseosmosiscompositemembraneQIUShi1,WULiguang2,ZHANGLin1,CHENHuanlin1,GAOCongjie1,3(1CollegeofMaterialsScienceandChemicalEngineering,ZhejiangUniversity,Hangzhou310027,Zhejiang,China;2SchoolofEnvironmentalScienceandEngineering,ZhejiangGongshangUniversity,Hangzhou310035,Zhejiang,China;3NationalEngineeringResearchCenterforLiquidSeparationMembrane,Hangzhou310012,Zhejiang,China)Abstract:Reverseosmosiscompositemembranewaspreparedbyinterfacialpolymerization(IP)ofmetaphenylenediamine(MPD)withtrimesoylchloride(TMC)onthesurfaceofpolysulfone(PS)support.Theeffectsofmonomersconcentration,reactiontimeofIP,timeandtemperatureofheattreatmentontheseparationperformanceofcompositemembraneswereinvestigated.Theinfluencesofphase-transfercatalyst(PTC)ontheseparationperformanceofcompositemembranewerealsostudied,andthemechanismofreactionprocesswasdiscussed.Fromtheorthogonalexperimentresults,theoptimumconditionsweretheconcentrationofTMCandPMD3g·L-1,20g·L-1respectively,andthetemperatureandtimeofheattreatment90℃and15min,andthefluxof14.91L·m-2·h-1aswellasrejectionof0.951(pressure1.6MPa,temperature25℃,concentrationofNaCl20000mg·L-1)wereobtainedundertheseconditions.Inaddition,itwasfoundthatatalowconcentrationofMPD,theseparationperformanceofcomposi