METHOD FOR PRODUCING COMPOSITE SEMIPERMEABLE MEMBRANE AND WATER USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a composite semipermeable membrane having a high solute removing property and water permeability, the membrane being operable under a low pressure while preventing scaling thereon. SOLUTION: The composite semipermeable membrane having a crosslinked polyamide superthin film layer obtained by the polycondensation reaction of a polyfunctional amine and a polyfunctional acid halide on a fine porous supporting film is characterized in that the polyfunctional amine includes an ortho aromatic diamine having two amino groups at an ortho position (o-) and in that mole% o-aromatic diamine in the total polyfunctional amines in the superthin film is equal to 50-95% or lower according to the1H NMR method. COPYRIGHT: (C)2004,JPO&NCIPI