Regeneration of plastic etchants

Details Regeneration of plastic etchants Regeneration of plastic etchants

1976-04-20

1978-10-03

Prescott, Arthur C.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

204 97, 204149, 204180P, C02C 512

Patent

active

041182952

ABSTRACT:
A method useful in the regeneration of a spent chromic acid-sulfuric acid plastic etch solution and also in the recovery of such etchant chemicals from rinse water associated with a plastic etching process, which method involves an electrolytic treatment, in which oxidation of trivalent chromium impurities to the serviceable hexavalent state takes place simultaneously with expulsion of organic impurities from the solution.

REFERENCES:
patent: 3481851 (1969-12-01), Lancy
patent: 3682796 (1972-08-01), Bedi et al.
patent: 3728238 (1973-04-01), Tarjanyi et al.
patent: 3730864 (1973-05-01), Tarjanyi et al.
patent: 3761369 (1973-09-01), Tirrell
patent: 3764503 (1973-10-01), Lancy et al.
patent: 3909381 (1975-09-01), Ehrsam
patent: 4006067 (1977-02-01), Gussack

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