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.
出处
《过程工程学报》
CAS
CSCD
北大核心
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)