Cation exchange membrane having high durability with diffusion c

Details Cation exchange membrane having high durability with diffusion c Cation exchange membrane having high durability with diffusion c

1990-07-05

1992-02-04

Niebling, John

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C25B 1306

Patent

active

050857541

ABSTRACT:
A cation exchange membrane having having durability, which is adapted for use in electrolysis or an alkali metal chloride, which comprises a quadrilateral base membrane and, disposed on at least one marginal area of one surface of the base membrane, a diffusion coating having a capability for an alkali metal hydroxide to diffuse therethrough at a diffusion velocity greater than that at which the alkali metal hydroxide diffuses through a fluorocarbon polymer layer constituting the base membrane when the base membrane is composed of one fluorocarbon polymer layer or through one outermost layer of the base membrane which layer has thereon the diffusion coating and has a water sorption smaller than that of the opposite outermost layer of the base membrane, when the base membrane is composed of a plurality of fluorocarbon polymer layers. The cation exchange membrane is free, for a prolonged period of time, from the local lowering of the mechanical strength of the membrane as caused by the precipitation of an alkali metal chloride within and the formation of oxygen in nascent state within the base membrane during the electrolysis of an alkali metal chloride.

REFERENCES:
patent: 4108742 (1978-08-01), Seko et al.
patent: 4111779 (1978-09-01), Seko et al.
patent: 4402806 (1983-09-01), Coker et al.
patent: 4894128 (1990-01-01), Beaver

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