| 摘要 |
PCT No. PCT/JP90/01331 Sec. 371 Date Jun. 12, 1991 Sec. 102(e) Date Jun. 12, 1991 PCT Filed Oct. 16, 1989 PCT Pub. No. WO91/05602 PCT Pub. Date May 2, 1991.An organic substance can be separated or concentrated by pervaporation or vapor permeation with a selective separation membrane comprising a polyparabanic acid consisting of recurring units of the general formula: <IMAGE> (I) wherein R represents a divalent organic group, a blend of the polyparabanic acid with a polymer having sulfonic acid groups, or a polyparabanic acid having sulfonic acid groups and mainly comprising recurring units of the above general formula (I).
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