Composite semipermeable membrane

Patent metadata

Field	Value
Publication number	US-10143976-B2
Application number	US-201515539347-A
Country	US
Kind code	B2
Filing date	Dec 25, 2015
Priority date	Dec 26, 2014
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

The present invention relates to a composite semipermeable membrane including a supporting membrane and a separation functional layer disposed on the supporting membrane, in which the separation functional layer comprises an aromatic polyamide, the aromatic polyamide has side chains and terminal groups, at least one of the side chains and terminal groups of the aromatic polyamide being an amino group, at least one of the side chains and terminal groups of the aromatic polyamide is a substituent having a structure represented by formula (1): —NXY or formula (2): —NXYZ, and in the aromatic polyamide, a content A of substituents having structures represented by formula (1) and formula (2) and a content B of amide groups satisfy 0.005≤A/B≤0.15.

First claim

The invention claimed is:

1. A composite semipermeable membrane comprising a supporting membrane and a separation functional layer disposed on the supporting membrane,
wherein the separation functional layer comprises an aromatic polyamide,
the aromatic polyamide has side chains and terminal groups, at least one of the side chains and terminal groups of the aromatic polyamide being an amino group,
at least one of the side chains and terminal groups of the aromatic polyamide is a substituent having a structure represented by the following formula:

in which R is —NO 2 or —NHOH, and
in the aromatic polyamide, a content A of substituents having structures represented by the formula and a content B of amide groups satisfy 0.005≤A/B≤0.15,
in the aromatic polyamide, the content A of the substituents having structures represented by the formula, the content B of amide groups, a content C of terminal carboxyl groups, and a content D of terminal amino groups satisfy 1.3≤B/(A+C+D).

2. The composite semipermeable membrane according to claim 1 , wherein the separation functional layer comprising the aromatic polyamide has a protuberance structure, the protuberance structure has protrusions, and a median value of heights of the protrusions is 50 nm or larger.

Assignees

• Toray Industries

Inventors

• Tanaka Hiroaki
• Sato Kazuki
• Ogawa Takafumi
• Sasaki Takao

Classifications

• B01D61/14

  Ultrafiltration; Microfiltration · CPC title

• B01D69/10

  Supported membranes; Membrane supports · CPC title

• B01D69/12

  Composite membranes; Ultra-thin membranes · CPC title

• C08G69/26

  derived from polyamines and polycarboxylic acids · CPC title

• B01D71/56 Primary

  Polyamides, e.g. polyester-amides · CPC title