PROCESS FOR ELECTRODIALYTICALLY REGENERATING AN ELECTROLESS PLATING BATH BY REMOVING AT LEAST A PORTION OF THE REACTED PRODUCTS

摘要

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 transferred anions, the replacment taking place in a compartment of the electrodialytic cell located between the two anionic permselective membrane.