Regeneration of spent ferric chloride etchants

Details Regeneration of spent ferric chloride etchants Regeneration of spent ferric chloride etchants

1989-05-12

1991-07-30

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204130, C25B 126

Patent

active

050357786

ABSTRACT:
Spent ferric chloride etching compositions are regenerated by electrolysis which includes introducing spent ferric chloride etching composition containing total iron content substantially equal to the original total iron content of fresh etching composition into the anode compartment of an electrolysis cell that contains an anode compartment, a cathode compartment, and an anion-exchange membrane separating the compartments, and applying voltage of +0.6 to +1.5 volts versus a saturated calomel electrode to the anode.

REFERENCES:
patent: 2748071 (1956-05-01), Eisler
patent: 3622478 (1971-11-01), Beyer
patent: 3761369 (1973-09-01), Tirrell
patent: 3788959 (1974-01-01), Smith
patent: 3964956 (1976-06-01), Snyder
patent: 4269678 (1981-05-01), Faul et al.
patent: 4396475 (1983-08-01), Stehlik
patent: 4468305 (1984-08-01), Hillis
patent: 4765728 (1988-08-01), Hamano et al.

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