Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Preparing inorganic compound
Reexamination Certificate
2006-05-23
2006-05-23
Nguyen, Nam (Department: 1753)
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Preparing inorganic compound
C205S508000, C205S509000, C205S514000
Reexamination Certificate
active
07048843
ABSTRACT:
The invention relates to a method for producing metal hydroxides or alkaline metal carbonates by anode dissolution of the corresponding metals and precipitation of the hydroxides or alkaline carbonates in an aqueous medium. The anode dissolution of the metal components is carried out in the anode compartment of a three-compartment electrolytic cell. An aqueous auxiliary salt solution is fed to an intermediate compartment that is disposed between the anode compartment and the cathode compartment and that is separated therefrom by a porous membrane. An at least not alkaline metal salt solution is continuously taken from the anode compartment while an alkaline auxiliary salt solution is continuously taken from the cathode compartment. The at least not alkaline metal salt solution and the alkaline auxiliary salt solution are combined outside the electrolytic cell for the purpose of precipitating metal hydroxides or alkaline metal carbonates.
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Database WPI Section CH, Week 198215 Derwent Publications Ltd., London, GB; An 1982-30405E XP0021.79653 & SU 834 253 A (Ivan Chem-Techn), 30, Mai 1981 (May 30, 1981).
Gille Gerhard
Görge Astrid
Kruft Michael
Meese-Marktscheffel Juliane
Naumann Dirk
Gil Joseph C.
H.C. Starck GmbH
Nguyen Nam
Van Luan V.
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