Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1980-02-19
1981-09-15
Edmundson, F.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204180P, B01D 5702
Patent
active
042895979
ABSTRACT:
A process is provided for regenerating a spent electroless copper plating bath which contains alkali metal salts resulting from the reduction of a water soluble copper salt under copper plating and reducing conditions. The regeneration is effected by means of the electrodialytic transfer of at least a portion of the anions in the spent plating bath through an anionic permselective membrane into the anode compartment of an electrodialytic cell. In the preferred embodiment, hydroxyl ions from the cathode compartment of the electrodialytic cell are concurrently transferred through a second anionic permselective membrane to replace the transferred anions, the replacement taking place in a compartment of the electrodialytic cell located between the two anionic permselective membranes.
REFERENCES:
patent: 3394068 (1968-07-01), Calmon et al.
patent: 3764503 (1973-10-01), Lancy et al.
patent: 4105532 (1978-08-01), Haines et al.
patent: 4111772 (1978-09-01), Horn
Korngold, Electrodialysis in Advanced Water Treatment, Desalination, vol. 24, pp. 129-139, Elsevier (1978).
Adams John M.
Edmundson F.
Electrochem International, Inc.
Price, Jr,. Stanley J.
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