Efficient electrolytic method of making chromic acid from sodium

Details Efficient electrolytic method of making chromic acid from sodium Efficient electrolytic method of making chromic acid from sodium

1991-06-10

1992-06-16

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204 89, 423 57, 423595, 423607, C25B 122

Patent

active

051222388

ABSTRACT:
Disclosed is a method of making chromic acid by electrolyzing an aqueous solution of sodium bichromate until the sodium bichromate is converted to chromic acid at a bichromate percent conversion of about 1 to about 48.4. Sulfuric Acid is then added to the aqueous solution in an amount between stoichiometric and about 30 wt % in excess of stoichiometric to convert the remaining sodium bichromate to chromic acid. This results in the precipitation of chromic acid, which is separated from the aqueous solution.

REFERENCES:
patent: 4144145 (1979-03-01), Watanabe et al.
patent: 4273628 (1981-06-01), Kidon et al.
patent: 4290864 (1981-09-01), Shuster et al.

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