Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1994-05-11
1997-03-11
Cintins, Ivars
Liquid purification or separation
Processes
Ion exchange or selective sorption
106 122, 106 127, 210667, 210670, 210688, B01D 1504
Patent
active
056097670
ABSTRACT:
An electroless nickel(EN)/hypophosphite plating bath is provided employing acetic acid/acetate as a buffer and which is, as a result, capable of perpetual regeneration while avoiding the production of hazardous waste. A regeneration process is provided to process the spent EN plating bath solution. A concentrated starter and replenishment solution is provided for ease of operation of the plating bath. The regeneration process employs a chelating ion exchange system to remove nickel cations from spent EN plating solution. Phosphites are then removed from the solution by precipitation. The nickel cations are removed from the ion exchange system by elution with hypophosphorous acid and the nickel concentration of the eluate adjusted by addition of nickel salt. The treated solution and adjusted eluate are combined, stabilizer added, and the volume of resulting solution reduced by evaporation to form the bath starter and replenishing solution.
REFERENCES:
patent: 4303704 (1981-12-01), Courduvelis et al.
patent: 5112392 (1992-05-01), Anderson et al.
patent: 5258061 (1993-11-01), Martyak et al.
Cintins Ivars
Stanley Timothy D.
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