C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/201
C25B 13/08 (2006.01) C25B 1/46 (2006.01) C25B 13/04 (2006.01)
Patent
CA 1129812
C-7090 ABSTRACT OF THE DISCLOSURE 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.
309415
Olin Corporation
Osler Hoskin & Harcourt Llp
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