Chemistry: electrical and wave energy – Apparatus – Coating – forming or etching by sputtering
Patent
1977-08-29
1978-08-08
Prescott, Arthur C.
Chemistry: electrical and wave energy
Apparatus
Coating, forming or etching by sputtering
204180P, B01D 1302
Patent
active
041055349
ABSTRACT:
Apparatus for removing ionic impurities from an electro-plating bath and similar electrolyte solutions by electrodialysis of the solution comprises a special electrolytic cell having a generally tubular anode, a generally tubular cathode and a generally tubular permselective membrane that are disposed concentrically with respect to each other, the generally tubular permselective membrane being positioned between the tubular anode and the tubular cathode. Additionally, the cell is provided with longitudinally movable scraper means for removing precipitated particulate matter from the surface of one of the generally tubular electrodes (that is, from the surface of the anode or the cathode) facing the permselective membrane. The generally tubular anode and permselective membrane together define a generally annular anolyte compartment through which an anolyte solution can be circulated, and the generally tubular cathode and permselective membrane together define a generally annular catholyte compartment through which a catholyte solution can be circulated. If the ionic impurities to be removed from the electrolyte solution are anions the permselective membrane is an anion permeable material and the solution being treated serves as the anolyte solution in the cell, and if the ionic impurities are cations the permselective membrane is a cation permeable material and the solution being treated serves as the catholyte solution in the cell.
REFERENCES:
patent: 2795541 (1957-06-01), Muller
patent: 2997430 (1961-08-01), Foyn
patent: 3909381 (1975-09-01), Ehrsam
patent: 3920534 (1975-11-01), Jensen et al.
patent: 3984303 (1976-10-01), Peters et al.
Prescott Arthur C.
Raymond John L.
Reath Robert Z.
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