COMPOSITE SEPARATION MEMBRANE

摘要

The present invention provides a composite separation membrane which comprises a separation layer that is formed of SPAE on the surface of a porous supporting membrane, and wherein the porous supporting membrane and the SPAE film are firmly bonded with each other and the separation characteristics and water permeability are maintained for a long period of time. The present invention is a composite separation membrane which comprises a separation layer on the surface of a porous supporting membrane. This composite separation membrane is characterized in that the porous supporting membrane contains 50% by mass or more of a polyphenylene ether and the separation layer is formed of a sulfonated polyarylene ether copolymer that is configured of a repeating unit of a specific hydrophobic segment and a specific hydrophilic segment. A composite separation membrane of the present invention is suitable as a liquid processing membrane such as a nanofiltration membrane or a reverse osmosis membrane.