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

Abstract

Provided is an ion exchange membrane for alkali chloride electrolysis, the ion exchange membrane exhibiting low membrane resistance and reducing the electrolysis voltage during alkali chloride electrolysis, even when the space between reinforcing fibers is narrow and membrane strength is high. This ion exchange membrane 1 for alkali chloride electrolysis has: a fluorine-based polymer that contains ion exchange groups; a reinforcing material formed from reinforcing fibers embedded within the fluorine based polymer, and optionally included sacrificial fibers; and elution holes for the sacrificial fibers present between the reinforcing fibers. In a cross-section orthogonal to the lengthwise direction of the reinforcing fibers forming the reinforcing material, the average distance (d1) from the center of a reinforcing fiber 22 to the center of a neighboring reinforcing fiber 22 is 750-1,000 [Mu]m, the total area (S) calculated by adding the cross-sectional area of an elution hole 28 and the cross-sectional area of sacrificial fiber 24 remaining in the elution hole 28 is 500-5,000 [Mu]m2 per elution hole, and the number n of elution holes 28 between neighboring reinforcing fibers 22 is 4-6.

Description

technical field [0001] The present invention relates to an ion exchange membrane for electrolysis of alkali metal chloride and an electrolysis device for alkali metal chloride. Background technique [0002] As the ion exchange membrane used in the alkali metal chloride electrolysis method for producing alkali metal hydroxide and chlorine by electrolyzing an aqueous solution of alkali metal chloride such as seawater, there are known: Salt base, and sulfonic acid or sulfonate) fluorine-based polymer electrolyte membrane. [0003] The electrolyte membrane is usually reinforced with a reinforcing material made of reinforcing wire (polytetrafluoroethylene (hereinafter, referred to as PTFE) wire, etc.) from the viewpoint of maintaining mechanical strength and dimensional stability. However, the membrane resistance of the ion exchange membrane having a reinforcing material formed of PTFE yarn or the like becomes high, and the electrolysis voltage increases. [0004] Therefore, it...

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Problems solved by technology

However, the membrane resistance of the ion exchange membrane having a reinforcing material formed of PTFE filament etc. becomes high, and the electrolysis voltage rises

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