| 摘要 |
PCT No. PCT/EP90/02074 Sec. 371 Date Oct. 1, 1991 Sec. 102(e) Date Oct. 1, 1991 PCT Filed Dec. 3, 1990 PCT Pub. No. WO91/08043 PCT Pub. Date Jun. 13, 1991.Composite membrane-for separating water from fluid mixtures containing organic components by means of pervaporation comprising a separating layer of cross-linked polyvinyl alcohol, which has been subjected to a post-cross-linking by treatment with acids acting in the vapor phase on the polyvinyl alcohol layer. The acids are preferably hydrohalic acids, sulfurous acid, sulfuric acid, nitrous acid, nitric acid or acetic acid.
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