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Improvement of ethanol selectivity of silicalite membrane in pervaporation by silicone rubber coating

Authors
Journal
Journal of Membrane Science
0376-7388
Publisher
Elsevier
Publication Date
Volume
210
Issue
2
Identifiers
DOI: 10.1016/s0376-7388(02)00364-2
Keywords
  • Silicalite
  • Pervaporation
  • Ethanol Selectivity
  • Silicone Rubber
  • Coating

Abstract

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 α=125 with a total flux of 0.14 kg/m 2 h.

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