Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1973-03-05
1977-02-01
Mack, John H.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
204130, 204149, C25C 110
Patent
active
040060675
ABSTRACT:
The instant invention relates to a process for changing the oxidation state of a compound or ionic species preferably a dissolved ionic species, and the novel electrochemical cell utilized therein. In the instant process, the compound or ionic species is passed through a porous electrode, which is maintained at a voltage sufficient to change the oxidation state of said compound or ionic species. This process is especially useful for oxidation-reduction processes, wherein said species is an ion having the same charge as the porous electrode. The porous electrode is isolated from the oppositely charged electrode by a semipermeable membrane, said membrane being impermeable to said dissolved species. In a much preferred embodiment, the dissolved species is chromium in the +3 oxidation state, e.g., the chromium available in chromic acid solutions which have been "used" in plastic etching processes or in processes for the oxidation of organic compounds; and the membrane is fluoro sulfonic acid membrane. In this embodiment the "used" chromic acid solutions may be substantially regenerated and cycled for reuse in the above-mentioned processes. The porous anode preferably used in the regeneration of chromic acid solutions comprises a lead alloy or compound.
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Goldberg Robert L.
Mack John H.
Prescott A. C.
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