Process for the preparation of alkali metal dichromates and chro

Details Process for the preparation of alkali metal dichromates and chro Process for the preparation of alkali metal dichromates and chro

1991-06-10

1992-07-07

Niebling, John

Chemistry: electrical and wave energy

Processes and products

204 97, 204103, C25B 114, C25B 122

Patent

active

051279991

ABSTRACT:
A process for the preparation of alkali metal dichromates and/or chromic acid by electrolysis of alkali metal monochromate and/or alkali metal dichromate solution in electrolysis cells, the anode and cathode compartments of which are separated by cation exchange membranes, wherein the cation exchange membranes are single-layer membranes based on perfluorinated polymers having sulfonic acid groups as cation exchange groups, and an aqueous solution having a pH of 4 to 14 is produced in the cathode compartment of the cells.

REFERENCES:
patent: 3305463 (1967-02-01), Carlin
patent: 4273628 (1981-06-01), Kidon et al.

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