Process and apparatus for the regeneration of chromic acid baths

Details Process and apparatus for the regeneration of chromic acid baths Process and apparatus for the regeneration of chromic acid baths

1979-03-30

1981-01-06

Prescott, Arthur C.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204 89, 204130, 204151, 204DIG13, B01D 1302, C02C 512

Patent

active

042435013

ABSTRACT:
A process and electrodialysis cell for regenerating used chromic acid baths for reuse. The process and apparatus have an anolyte chamber and a catholyte chamber separated by a cation permeable membrane and utilize as an improved catholyte solution an aqueous mixture of a water soluble salt such as sodium sulfate. A preferred anode which is not decomposed by the chromic acid bath comprises by weight about 1.5% of silver, about 5% of antimony, about 3% of tin and the balance lead.

REFERENCES:
patent: 3481851 (1969-12-01), Lancy
patent: 3761369 (1973-09-01), Tirrell
patent: 3764503 (1973-10-01), Lancy et al.
patent: 3909381 (1975-09-01), Ehrsar
patent: 3948738 (1976-04-01), Fujii
patent: 4118295 (1978-10-01), Korenowski et al.

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