高填充量ZSM-5/PDMS复合膜的制备及透醇性能研究  

Preparation of ZSM-5/PDMS composite membranes with high loading ZSM-5 for pervaporation of ethanol/water mixtures

作　　者：展侠[1] 刘吉辉[1] 汪雪超 夏阳[2] 李继定[2] 

机构地区：[1]北京工商大学食品学院,北京100048 [2]清华大学化学工程系,北京100084

出　　处：《化工新型材料》2014年第7期96-98,101,共4页New Chemical Materials

基　　金：国家自然科学基金资助项目(21206001;21176135;21371018);北京市自然科学基金资助项目(2132010);国家863计划项目(2012AA03A607);化学工程联合国家重点实验室开放课题资助(No.SKL-ChE-13A02);大学生科学研究与创业行动计划建设项目

摘　　要：以加成型硅橡胶(RT-615)为基膜,采用HF酸刻蚀的ZSM-5粒子作为填充材料,制备了高填充量ZSM-5/PDMS复合膜。通过扫描电镜(SEM)表征,发现复合膜填充量(ZSM-5:PDMS质量比)低于至100%时,复合膜表面和断面较致密,均未出现孔洞,当超过100%时,复合膜的上表面和断面出现明显微米级孔洞。将复合膜用于渗透汽化乙醇/水混合物的分离,研究发现随着ZSM-5填充量的提高,复合膜分离因子先增大后减小,这可能是由于填充量过大造成膜内的孔洞缺陷抑制了ZSM-5对乙醇选择性的提高,在填充量为70%时达到极大值21.0;复合膜渗透通量随着填充量的增大不断增加。将影响复合膜分离性能的因素分为外部因素(操作温度和料液浓度)和膜自身结构因素两部分,分别研究了各因素对复合膜渗透汽化分离性能的影响。ZSM 5/PDMS composite membranes with high loading ZSM-5 were prepared,in which additional silicone rubber（RT-615） and HF acid etched ZSM 5 were used as membrane matrix and reinforced inorganic materials. Based on the SEM characterization,it was found that the surface and cross-section of the membrane were dense with no pinholes as the loading amount of ZSM-5 （ZSM-5 ： PDMS weight ratio） below 100 %. As the loading amount of ZSM-5 exceeded 100 ~, mi- cro-pinholes appeared on the top surface and cross-section of the membrane. The membrane were applied in the pervapora- tion of ethanol/water mixtures. It was found that the separation factor increased first and then decreased with increasing ZSM-5 loading,and maintained the maximum value of 21.0 with ZSM-5 loading of 70%. The total flux increased as the ZSM-5 loading was increased. The factors influencing pervaporation performance of the membrane were divided into two parts,including external driving force （operation temperature and ethanol feed concentration） and intrinsic permeability of the membrane. The effect of operation temperature and ethanol feed concentration on pervaporation performance was also studied.

关 键 词：ZSM-5 加成型硅橡胶 高填充量 渗透汽化 乙醇 水 

分 类 号：TQ051.893[化学工程]