SEPARATING FILM FOR WATER-SOLUBLE ORGANIC MATERIAL AND SEPARATION OF WATER-SOLUBLE ORGANIC MATERIAL UTILIZING THE MEMBRANE

摘要

PURPOSE:To provide a pervaporation separating membrane for water-soluble org. materials having high permselectivity and high permeating velocity for liquid as well as high mechanical strength by using cellulose ester expressed by the specified formula as activated layer. CONSTITUTION:Cellulose ester expressed by the formula such as cellulose dodecanoate, is dissolved in a solvent such as chloroform, and the soln. is coated on a base body such as porous propylene film by casting or dipping, and the solvent is removed by drying. Using the separting membrane having an activated layer comprised of the cellulose eser obtd. by this method, water-soluble org. meterials are separated from aq. soln. of the water-soluble org. materials by the pervaporation process.