Nitto-denko Corporation

Atsuhito Komoto

Tomotsugu Miyabe

Masashi Echizen

Taisuke Yamaguchi

Kazusa Matsui

Yasuyuki Sakakibara

A separation membrane () of the present disclosure includes: a separation functional layer () composed of a polyamide containing, as a monomer unit, at least one selected from the group consisting of piperazine and a piperazine derivative; and a coating () covering the separation functional layer () and containing a polymer having a repeating unit represented by the following formula (1). In the formula (1), Nis a nitrogen atom constituting a quaternary ammonium cation, and Rand Rare each independently a substituent containing a carbon atom bonded to the nitrogen atom.

Separation membrane

A separation membrane () of the present disclosure includes: a separation functional layer () composed of a polyamide; and a coating () covering the separation functional layer () and containing a polymer having a repeating unit represented by the following formula (1). In the formula (1), Nis a nitrogen atom constituting a quaternary ammonium cation, and Rand Rare each independently a substituent containing a carbon atom bonded to the nitrogen atom. 

A separation membrane () of the present disclosure includes: a separation functional layer () composed of a polyamide containing, as a monomer unit, at least one selected from the group consisting of piperazine and a piperazine derivative; and a coating () covering the separation functional layer () and containing a polymer having a repeating unit represented by the following formula (1). In the formula (1), Nis a nitrogen atom constituting a quaternary ammonium cation, and Rand Rare each independently a substituent containing a carbon atom bonded to the nitrogen atom. 

The objective of the present invention is to provide a composite semi-permeable membrane having high processing efficiency even when processing of wastewater having a suspended matter content high enough to tend to result in clogging, said processing efficiency being unlikely to decline even under elevated-pressure operation accompanying continuous use at high pressure. The present invention pertains to a composite semi-permeable membrane having a polymer porous layer on one surface of a nonwoven cloth layer, and a polyamide separation function layer on the polymer porous layer, wherein the ratio of the thickness of the polymer porous layer to the thickness of the nonwoven cloth layer is 0.22 to 0.45.

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Osaka, Japan

Atsuhito Komoto