有机硅烷改性PDMS/Silicalite渗透汽化杂化膜制备及其分离性能  

Preparation of Silane Modified PDMS/Silicalite Hybrid Membrane and Its Pervaporation for Dilute Ethanol-Water Solution

作　　者：伊守亮[1,2] 苏仪[1] 周浩力[1,2] 陈向荣[1] 苏志国[1] 万印华[1] 

机构地区：[1]中国科学院过程工程研究所生化工程国家重点实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《过程工程学报》2009年第2期381-386,共6页The Chinese Journal of Process Engineering

基　　金：国家重点基础研究发展规划(973)基金资助项目(编号:2007CB714305);中国科学院知识创新工程重大项目基金资助(编号:KSCX1-YW-11D2)

摘　　要：采用硅烷偶联剂对全硅沸石Silicalite-1进行表面改性,以聚二甲基硅氧烷(PDMS)为基体,制备了渗透汽化PDMS/Silicalite杂化膜.用FT-IR,TGA等对改性的效果和杂化膜的热稳定性能进行了表征,并以低浓度乙醇/水体系为研究对象,以渗透通量和分离因子为评价指标,考察了料液组成、进料温度、循环流速、膜下游侧真空度等因素对改性杂化膜分离性能的影响.结果表明,硅烷改性沸石所制杂化膜对低浓度乙醇/水体系的分离因子比空白膜和未改性杂化膜分别提高136%和45%.随料液中乙醇浓度从5%增加到69%,膜分离因子从22降低到7,而其他因素对膜的选择性影响较小.With 3-aminopropyltrlethoxysilane as a coupling and surface modification agent for Silicalite-1 nanoparticles, polydimethylsiloxane （PDMS）-Silicalite filled pervaporation membranes were prepared. The modification effect of Silicalite and thermal resistant performance of the hybrid membrane were investigated by FT-IR and TGA. The effects of feed concentration, feed temperature, feed flow rate and downstream vacuum degree on the pervaporation performance of dilute ethanol/water solutions were also examined. The results showed that compared with pure PDMS and unmodified hybrid membranes, the selectivity of silane modified hybrid membrane could be improved by 136% and 45%. With the increasing of ethanol concentration in the feed from 5% to 69%, the membrane selectivity was decreased remarkably. Nevertheless, other operation parameters had a little effect on membrane selectivity.

关 键 词：聚二甲基硅氧烷 渗透汽化 SILICALITE-1 杂化膜 硅烷偶联剂 改性 

分 类 号：TQ028.8[化学工程]