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

1991-02-22

1992-03-10

Niebling, John

Chemistry: electrical and wave energy

Processes and products

204 97, 204130, C25B 122, C25B 100

Patent

active

050947290

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 chamber are 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.

REFERENCES:
patent: 1878918 (1932-09-01), Udy
patent: 2333578 (1943-11-01), Knox, Jr. et al.
patent: 3305463 (1967-02-01), Carlin
Chemical Abstracts, Band, Band 87, Nr. 20, Nov. 14, 1977, Seite 463, Zusammenfassung Nr. 159202k, Columbus, Ohio, U.S.; & JP-A-77 81 097 (K. Saito) 07-07-1977.
Ullmann's Encyclopedia of Industrial Chemistry, 5th Edition, vol. A7: Chlorophenols to Copper Compounds, 1986, pp. 67-97.

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