Ion exchange membrane for alkali chloride electrolysis and alkali chloride electrolysis apparatus

Patent metadata

Field	Value
Publication number	US-2017218526-A1
Application number	US-201715491272-A
Country	US
Kind code	A1
Filing date	Apr 19, 2017
Priority date	Nov 7, 2014
Publication date	Aug 3, 2017
Grant date	—

Abstract

To provide an ion exchange membrane for alkali chloride electrolysis for which membrane strength is increased while membrane resistance is reduced to reduce electrolysis voltage during alkali chloride electrolysis and which prevents peeling between layers (S) and a layer (C). The ion exchange membrane for alkali chloride electrolysis comprises a layer (C) which comprises a fluorinated polymer having carboxylic acid functional groups, at least two layers (S) which comprise a fluorinated polymer having sulfonic acid functional groups, and a reinforcing material, wherein the layers (S) include a layer (Sa) and a layer (Sb), the layer (Sa) is a layer which is adjacent to the layer (C), the layer (Sb) is a layer which is not adjacent to the layer (C), the reinforcing material is disposed in the layer (Sb) substantially in parallel to the layer (Sb) in a state not in contact with the layer (Sa), and the ion exchange capacity of the layer (Sa) is lower than the ion exchange capacity of the layer (Sb).

First claim

What is claimed is:

1 . An ion exchange membrane for alkali chloride electrolysis, comprising a layer (C) which comprises a fluorinated having polymer having carboxylic acid groups, at least two layers (S) which comprise a fluorinated polymer having sulfonic acid functional groups, and a reinforcing material, wherein said layers (S) include a layer (Sa) and a layer (Sa), said layer (Sa) is a layer which is adjacent to the layer (C), said layer (Sb) is a layer which is not adjacent to the layer (C), said reinforcing material is disposed in said layer (Sb) substantially in parallel with the layer (Sb) in a state not in contact with said layer (Sa), and the ion exchange capacity of said layer (Sa) is lower than the ion exchange capacity of said layer (Sb).

2 . The ion exchange membrane for alkali chloride electrolysis according to claim 1 , wherein the difference between the ion exchange capacity of the layer (Sa) and the ion exchange capacity of the layer (Sb) is from 0.01 to 0.5 meq/g dry resin.

3 . The ion exchange membrane for alkali chloride electrolysis according to claim 1 , wherein the ion exchange capacity of the layer (Sb) is from 0.51 to 2.01 meq/g dry resin.

4 . The ion exchange membrane for alkali chloride electrolysis according to claim 1 , wherein the reinforcing material is disposed at a position where the ratio of the thickness of the layer (Sb) located on the opposite side to the layer (C) via the reinforcing member in the layer (Sb), to the thickness of the layers (S), becomes to be from 0.05 to 0.6.

5 . The ion exchange membrane for alkali chloride electrolysis according to claim 1 , wherein the ratio of the thickness of the layer (Sa) to the thickness of the layer (Sb) is at most 0.4.

6 . The ion exchange membrane for alkali chloride electrolysis according to claim 1 , wherein the thickness of the layer (Sa) is from 1 to 50 μm.

7 . The ion exchange membrane for alkali chloride electrolysis according to claim 1 , wherein the total thickness of the layer (Sa) and the layer (Sb) located on the layer (C) side via the reinforcing material is from 30 to 140 μm, and the thickness of the layer (Sb) located on the opposite side to the layer (C) via the reinforcing material is from 10 to 60 μm.

8 . The ion exchange membrane for alkali chloride electrolysis according to claim 1 , wherein the difference between the ion exchange capacity of the layer (C) and the ion exchange capacity of the layer (Sa) is at most 0.5 meq/g dry resin.

9 . The ion exchange membrane for alkali chloride electrolysis according to claim 1 , wherein the ion exchange capacity of the layer (C) is from 0.5 to 2.0 meq/g dry resin, and the ion exchange capacity of the layer (Sa) is from 0.5 to 2.0 meq/g dry resin.

10 . The ion exchange membrane for alkali chloride electrolysis according to claim 1 , wherein the thickness of the layer (C) is from 5 to 50 μm.

11 . An alkali chloride electrolysis apparatus comprising an electrolytic cell provided with a cathode and an anode, and an ion exchange membrane for alkali chloride electrolysis as defined in claim 1 , which is mounted in the electrolyte cell so as to partition inside of the electrolytic cell into a cathode clamber an the cathode side and an anode chamber on the anode side and so that the layer (C) becomes to be on the cathode side, and the layers (S) become to be on the anode side.

Assignees

• Asahi Glass Co Ltd

Inventors

• Yamaki Yasushi
• Kaneko Takayuki
• Kusano Hiromitsu
• Nishio Takuo
• Umemura Kazuo

Classifications

• C25B13/08

  based on organic materials · CPC title

• C25B1/46 Primary

  in diaphragm cells · CPC title

• C08J5/2237

  containing fluorine · CPC title

• B01D71/82

  characterised by the presence of specified groups, e.g. introduced by chemical after-treatment · CPC title

• B01D71/32

  containing fluorine atoms · CPC title