公开(公告)号：US10357747B2

公开(公告)日：2019-07-23

申请号：US15763331

申请日：2016-09-30

Applicant: NITTO DENKO CORPORATION

Inventor： Shinya Nishiyama ,  Taisuke Yamaguchi ,  Takahisa Konishi ,  Hiroki Fujioka ,  Takashi Kamada ,  Shinichi Inoue

IPC: C02F1/44 ,  B01D61/02 ,  B01D63/10 ,  B01D67/00 ,  B01D69/12 ,  B01D71/38 ,  B01D71/56 ,  B01D71/68 ,  C02F103/04 ,  C02F103/08 ,  C02F103/10 ,  C02F103/32

Abstract: A method for producing a spiral wound separation membrane element includes preparing a composite semipermeable membrane having a skin layer on the surface of a porous support. The method further includes forming on the skin layer a protective layer containing 35 mg/m2 or more of an anionic polyvinyl alcohol to prepare a protective layer-equipped composite semipermeable membrane, preparing an unwashed spiral wound separation membrane element from the protective layer-equipped composite semipermeable membrane, and passing wash water through the unwashed spiral wound separation membrane element to remove the protective layer on the skin layer.