Processes for the preparation of alkali metal dichromates and ch

Details Processes for the preparation of alkali metal dichromates and ch Processes for the preparation of alkali metal dichromates and ch

1990-12-21

1991-09-24

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 89, 204 97, C25B 100, C25B 122

Patent

active

050511556

ABSTRACT:
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 chambers are separated by cation exchange member, the improvement wherein the formation of deposits on the membrane is prevented comprising continuously introducing a solution containing chromate at a pH of about 3 to 10 into the cathode chamber during the electrolysis.

REFERENCES:
patent: 2333578 (1943-11-01), Knox Jr. et al.
Chemical Abstracts, vol. 87, No. 20, Nov. 14, 1977, p. 463, Paragraph No. 159202k, Columbus, Ohio, US; & JP-A-77 81 097 (K. Saito) 07-07-1977.
Ullmanns Encyclopedia of Industrial Chemistry, 5th Edition, Volum A 7, 1986 pp. 67-97.

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