Zeolite/Polyelectrolyte Multilayer Pervaporation Membranes for Enhanced Reaction Yield
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- 作者：Peter M. Budd ; Ná ; gila M. P. S. Ricardo ; Jalal J. Jafar ; Ben Stephenson ; and Ron Hughes
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2004
- 出版时间：April 14, 2004
- 年：2004
- 卷：43
- 期：8
- 页码：1863 - 1867
- 全文大小：84K
- 年卷期：v.43,no.8(April 14, 2004)
- ISSN：1520-5045
文摘
Multilayer membranes were prepared by alternating adsorption of a cationic polyelectrolyte,chitosan, and an anionic polyelectrolyte, poly(4-styrene sulfonate), onto zeolite A films formedon porous supports in sheet and tube form. The multilayer membranes are shown to exhibit thehigh selectivity for water over alcohols associated with zeolite A but to be considerably morestable under acidic conditions than a pure zeolite A membrane. The membranes were successfullyapplied to the selective removal of water by pervaporation in the esterification of lactic acidwith ethanol, catalyzed by p-toluenesulfonic acid. For esterification at 70 
C, yields of about60% without the membrane were increased to >80% with pervaporation, and for esterificationat 100 C, yields of about 70% without the membrane were increased to >90% with pervaporation.
C, yields of about60% without the membrane were increased to >80% with pervaporation, and for esterificationat 100 C, yields of about 70% without the membrane were increased to >90% with pervaporation.