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Improvement of ethanol selectivity of silicalite membrane in pervaporation by silicone rubber coating |
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| Authors: | H Matsuda H Yanagishita H Negishi D Kitamoto T Ikegami K Haraya T Nakane Y Idemoto N Koura T Sano |
| Institution: | a Science University of Tokyo, 2641 Yamazaki, Noda, Chiba 278-8510, Japan b National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba Central 5, Ibaraki 305-8565, Japan c Japan Advanced Institute of Science and Technology, Tatsunokuchi, Ishikawa 923-1292, Japan |
| Abstract: | In order to improve the pervaporation performance of silicalite membrane, two types of silicone rubber, KE45 and KE108, were coated on the membrane surface. The initial molecular weight of KE108 is high and vulcanizing starts when it comes into contact with moisture in air, whereas the initial molecular weight of KE45 is low and vulcanizing starts when it is mixed with a catalyst. KE108 was found to be more effective than KE45 in enhancing the ethanol selectivity of silicalite membranes. A membrane coated using a 3 wt.% KE108 hexane solution showed separation factor of  =125 with a total flux of 0.14 kg/m2 h. |
| Keywords: | Silicalite Pervaporation Ethanol selectivity Silicone rubber Coating |
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