Diaphragms for use in the electrolysis of alkali metal chlorides

Details Diaphragms for use in the electrolysis of alkali metal chlorides Diaphragms for use in the electrolysis of alkali metal chlorides

1977-09-26

1980-01-22

Edmundson, F. C.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204295, 204296, 204 98, C25B 1304

Patent

active

041849396

ABSTRACT:
A diaphragm for use in the electrolysis of alkali metal chloride brines in electrolytic diaphragm cells is comprised of a support fabric impregnated with a non-fibrilic active component containing silica where the porous diaphragm has a permeability to alkali metal chloride brines of from about 100 to about 300 milliliters per minute per square meter of diaphragm at a head level difference in the cell of from about 0.1 to about 20 inches of the alkali metal chloride brines. The active component containing silica is employed in concentrations of from about 10 to about 75 milligrams per square centimeter of support fabric.
Suitable silica-containing materials include sand, colloidal silica, alkali metal silicates, alkaline earth metal silicates, aluminum silicates, as well as minerals such as sepiolites, meerschaums, attapulgites, montmorillonites and bentonites.
Support fabrics include, for example, felt fabrics produced from thermoplastics such as polyolefins or polyarylene sulfides.
The diaphragms are physically and chemically stable, can be easily installed in an electrolytic cell, have increased operational life and are produced from inexpensive materials.

REFERENCES:
patent: 1742411 (1930-01-01), Muller
patent: 3424659 (1969-01-01), Staal
patent: 3847762 (1974-11-01), Strain
patent: 4032427 (1977-06-01), Kadija

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