PERVAPORATION SEPARATION OF MIXED SOLUTION OF ORGANIC COMPOUND

摘要

PURPOSE:To selectively separate an organic compound by a pervaporation method by bringing a mixed solution of organic compounds in direct contact with one side of a heat resisting unsymmetrical separation membrane consisting of soluble aromatic polyimide of a specific composition. CONSTITUTION:A heat resisting unsymmetrical separating membrane is formed consisting of the aromatic tetracarboxylic acid component containing not less than 85mol% of an aromatic tetracarboxylic acid selected from biphenyl tetracarboxylate or diphenylether tetracarboxylate and of the aromatic polyamide containing not less than 90mol% of an aromatic diamine compound having 2-3 benzene rings. The organic compound intended for separation is selectively passed through this separation membrane with one side thereof in direct contact with a mixed solution of organic compounds. The organic compound thus permeated is then separated as a vapor.