C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 18/16 (2006.01) B01D 61/44 (2006.01)
Patent
CA 2343215
A method and a device for regenerating by electrodialysis an electroless metal deposition bath containing hypophosphite ions, preferably a nickel deposition bath, is described. As compared with known methods and devices, in which the bath solution is led through diluate compartments Di1a in a first electrodialysis unit E1 having cathodes Ka and anodes An, which compartments are separated from concentrate compartments Ko1a,Ko1b in the electrodialysis unit on the cathode side by monoselective cation-exchange membranes KS and on the anode side by anion-exchange membranes A, the diluate compartments Di1a and the concentrate compartments Ko1a,Ko1b being disposed alternately to one another, the method according to the invention and the device differ in that the bath solution is led simultaneously through diluate compartments Di2a,Di2b in a second electrodialysis unit E2 having cathodes Ka arid anodes An, which compartments are separated from concentrate compartments Ko2a in the second electrodialysis unit E2 on the cathode side by monoselective anion-exchange membranes AS and on the anode side by anion-exchange membranes A, the diluate compartments Di2a,Di2b and the concentrate compartments Ko2a in the second electrodialysis unit E2 being disposed alternately to one another.
L'invention concerne un procédé et un dispositif pour la régénération électrodialytique d'un bain de dépôt métallique sans courant contenant des ions hypophosphite, de préférence un bain de dépôt de nickel. Dans les procédés et dispositifs connus, on amène le liquide de bain dans un premier dispositif d'électrodialyse (E1) pourvu de cathodes (Ka) et d'anodes (An) en passant par des compartiments diluat (Di1a) séparés de compartiments concentrat (Ko1a, Ko1b) dans le dispositif d'électrodialyse par des membranes cationiques monosélectives (KS) côté cathodes et par des membranes anioniques (A) côté anodes, les compartiments diluat (Di1a) et les compartiments concentrat (Ko1a, Ko1b) alternant les uns avec les autres. Le procédé et le dispositif selon l'invention se distinguent des procédés et dispositifs connus en ce qu'on fait simultanément passer le liquide de bain à travers des compartiments diluat (Di2a, Di2b) pour l'amener dans un deuxième dispositif d'électrodialyse (E2) pourvu de cathodes (Ka) et d'anodes (An), les compartiments diluat (Di2a, Di2b) et les compartiments concentrat (Ko2a) étant séparés par des membranes anioniques monosélectives (AS) côté cathodes et par des membranes anioniques (A) côté anodes et alternant les uns avec les autres dans le deuxième dispositif électrodialytique (E2).
Blaschke Manfred
Born Rainer
Heydecke Jens
Kraft Alexander
Richtering Werner
Atotech Deutschland Gmbh
Riches Mckenzie & Herbert Llp
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