Processes for the preparation of alkali metal dichromates...

Details Processes for the preparation of alkali metal dichromates... Processes for the preparation of alkali metal dichromates...

C - Chemistry, Metallurgy

25

B

204/59, 204/63

C25B 1/22 (2006.01) C25B 1/00 (2006.01)

Patent

CA 1337807

A process for the preparation of alkali metal dichromates and chromic acid by the electrolysis of monochromate and/or dichromate solutions in an electrolytic cell in which the anode and cathode chamber is separated by a cation exchanger membrane anolyte fluid containing dichromate and/or chromic acid being formed in the anode chamber and alkaline catholyte fluid containing alkali metal ions being formed in the cathode chamber, the improvement wherein the catholyte fluids are periodically replaced by a solution which is at a pH below 6.

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