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Separation of Vapor Mixtures of Water and Alcohol by Aromatic Polyimide Hollow Fibers

Vapor mixtures of water and alcohol were separated into components by the use of hollow fibers made from an aromatic polyimide derived from 3, 3′, 4, 4′-biphenyl-tetracarboxylic dianhydride and aromatic diamines. The permeation rate of water vapor through the membrane is far greater than those of th...

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Bibliographic Details
Published in:KOBUNSHI RONBUNSHU 1989/07/25, Vol.46(7), pp.405-411
Main Authors: NAKAGAWA, Kanji, ASAKURA, Yoshio, NAKANISHI, Shunsuke, HOSHINO, Harutoshi, KOUDA, Hiroyuki, KUSUKI, Yoshihiro
Format: Article
Language:eng ; jpn
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Summary:Vapor mixtures of water and alcohol were separated into components by the use of hollow fibers made from an aromatic polyimide derived from 3, 3′, 4, 4′-biphenyl-tetracarboxylic dianhydride and aromatic diamines. The permeation rate of water vapor through the membrane is far greater than those of the vapors of various species of alcohols. When water-alcohol vapor mixtures with alcohol contents above 80 wt% are applied at 120°C, the permeation rate of water is as high as 230 times that of ethanol, and 4, 400 times that of isopropanol. The permeation rate of alcohol tends to increase with the water content and with the temperature of vapor, while that of water changes only a little. The swelling of polyimide film in liquid mixtures of water and ethanol was studied to compare the behavior towards liquids with that towards vapors. The difference is quite substantial, indicating that the membrane is suitable for the separation of vapor mixtures. The very excellent stability of the hollow fiber membrane of the present polyimide during prolonged use was confirmed by the measurements of mechanical properties, solution viscosity and permeation capability.
ISSN:0386-2186
1881-5685
DOI:10.1295/koron.46.405