Electrolyte series flow in electrolytic chlor-alkali cells

Details Electrolyte series flow in electrolytic chlor-alkali cells Electrolyte series flow in electrolytic chlor-alkali cells

1979-11-19

1981-05-26

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204128, 204256, C25B 134, C25B 900

Patent

active

042696755

ABSTRACT:
In an electrolytic chlor-alkali cell, or bank of cells, having a plurality of electrolyte compartments containing electrode pairs (anodes and cathodes) and wherein a hydraulically-impermeable membrane separates the electrolyte compartments into catholyte portions and anolyte portions, said cell or cells being employed to produce chlorine at the anodes and caustic at the cathodes by the electrolysis of an aqueous alkali metal chloride electrolyte, wherein said cathodes are operable as oxygen-depolarized cathodes and are effective in substantially avoiding formation of hydrogen at said cathodes, improved operation is attained by flowing anolyte liquor from anolyte portion to anolyte portion, sequentially, and/or flowing catholyte liquor from catholyte portion to catholyte portion, sequentially. The membrane substantially prevents Cl.sup.- from entering the catholyte liquor from the anolyte, and a high purity caustic, substantially free of salt, is produced.

REFERENCES:
patent: 4035254 (1977-07-01), Gritzner
patent: 4057474 (1977-11-01), Kurtz et al.

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