COMPOSITE SEMIPERMEABLE MEMBRANE AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a composite semipermeable membrane having a high removal rate when salt is removed from brine water as well as a high permeation flux. SOLUTION: The composite semipermeable membrane is characterized in that a polyamide separation-functional layer is formed on a microporous supporting membrane and low-molecular-weight acyl groups each having two substituted groups in theαposition are bonded covalently to each other in a polyamide molecule constituting the polyamide separation-functional layer. It is preferable that the polyamide constituting the polyamide separation-functional layer is cross-linked polyamide obtained by bringing an aqueous solution of polyfunctional amine into contact with an organic solvent containing a polyfunctional acid halide and a predetermined acid halide on the microporous supporting membrane so that the polyfunctional amine and the polyfunctional acid halide/the predetermined acid halide are subjected to a polycondensation reaction on the interface between the aqueous solution and the organic solvent. COPYRIGHT: (C)2007,JPO&INPIT