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Ion-exchange membrane for alkali chloride electrolysis, manufacturing method, and alkali chloride electrolysis device

A technology of alkali metal chloride and ion exchange membrane, which is applied in the direction of ion exchange treatment devices, ion exchange, cation exchange materials, etc., can solve the problems of electrolysis voltage rise and ion exchange membrane resistance increase, etc., and achieve low electrolysis voltage and increase Effect of low film strength and film resistance

Active Publication Date: 2017-08-29
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the membrane resistance of the ion-exchange membrane having a reinforcing cloth made of PTFE yarn etc. increases, and the electrolysis voltage increases

Method used

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  • Ion-exchange membrane for alkali chloride electrolysis, manufacturing method, and alkali chloride electrolysis device
  • Ion-exchange membrane for alkali chloride electrolysis, manufacturing method, and alkali chloride electrolysis device
  • Ion-exchange membrane for alkali chloride electrolysis, manufacturing method, and alkali chloride electrolysis device

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Embodiment

[0278] Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to the following description. Examples 1-3 are examples, and Examples 4-8 are comparative examples.

[0279] (TQ value)

[0280] The TQ value is a value linked to the molecular weight of the polymer to show the volumetric flow rate: 100mm 3 / sec in the form of temperature. The volumetric flow rate is set as follows: using Shimadzu Flow Tester CFD-100D (manufactured by Shimadzu Corporation), the fluorine-containing polymer having a group capable of being converted into an ion-exchange group is allowed to flow from Outflow when the orifice (diameter: 1mm, length: 1mm) melts and flows out (unit: mm 3 / Second).

[0281] (ion exchange capacity)

[0282] About 0.5 g of fluorine-containing polymer having a group that can be converted into an ion-exchange group is pressed on a flat plate at a temperature about 10°C higher than its TQ value to form a film, and a transmissio...

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Abstract

Provided is an ion-exchange membrane for alkali chloride electrolysis which has increased membrane strength and reduced membrane resistance, thereby reducing the electrolysis voltage for alkali chloride electrolysis. In this ion-exchange membrane (1) for alkali chloride electrolysis, a reinforcing material (20) formed by weaving reinforcing threads (22) and sacrificial threads (24) is disposed in a layer (S) (14), and layer (S) (14) comprises elution parts (28) which are formed by elution of at least portions of the sacrificial threads (24). In a cross section perpendicular to the warp threads of the reinforcing threads, the average distance (d1) from the center of a reinforcing thread (22) to the center of an adjacent reinforcing thread (22), the total area (P) obtained by adding the cross-sectional areas of the elution parts (28) and the cross-sectional areas of the remaining sacrificial threads (24) in the elution parts (28), the number (n) of elution parts between adjacent reinforcing threads (22), and the ion exchange capacity of a layer (Sa) in layer (S) (14) closest to the positive electrode side upon alkali chloride electrolysis are controlled within specific ranges.

Description

technical field [0001] The present invention relates to an ion exchange membrane for electrolysis of alkali metal chlorides, a method for producing the same, and an electrolysis device for alkali metal chlorides. Background technique [0002] As an ion exchange membrane used in the alkali metal chloride electrolysis method for electrolyzing an aqueous alkali metal chloride solution to produce alkali metal hydroxide and chlorine, there are known membranes having ion exchange groups (carboxylic acid type functional groups, sulfonic acid type functional groups etc.) electrolyte membrane formed of fluoropolymer. [0003] For the electrolyte membrane, from the perspective of maintaining mechanical strength and dimensional stability, a reinforcing wire (polytetrafluoroethylene (hereinafter referred to as PTFE) is usually embedded in the layer (S) containing a fluoropolymer having a sulfonic acid type functional group .) Silk, etc.) to form a reinforced cloth for reinforcement. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B13/08C25B9/00C25B9/23
CPCC25B13/08C08J5/225C08F214/262C08F216/1466C08J2327/18C25B1/46C08F216/1475C25B9/23C08F216/1416B01J39/05B01J39/20B01J47/12C08J5/2281C08J2329/10
Inventor 山木泰金子隆之草野博光西尾拓久央
Owner ASAHI GLASS CO LTD
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