C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/170, 204/98.
C25B 15/08 (2006.01) C23C 18/16 (2006.01)
Patent
CA 1131165
ABSTRACT OF THE DISCLOSURE A process is provided for regenerating a spent electrode copper plating bath which contains alkli 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 perferred embodiment, hydroxyl ions from the cathode compartment of the electrodialytic cell are concurrently transferred through a second anionic permselective membrane to replace the trans- ferred anions, the replacment taking place in a compartment of the electrodialytic cell located between the two anionic permselective membrane.
346933
Electrochem International Inc.
Macrae & Co.
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