Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Involving measuring – analyzing – or testing during synthesis
Reexamination Certificate
2005-05-10
2005-05-10
Phasge, Arun S. (Department: 1753)
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Involving measuring, analyzing, or testing during synthesis
C205S537000, C205S770000, C204S519000, C204S520000, C204S630000, C204S263000
Reexamination Certificate
active
06890417
ABSTRACT:
An electrolytic bath is divided into an anodic chamber and a cathodic chamber by a cation-exchange membrane. A base alkaline solution of high impurity concentration is supplied into the anodic chamber from a tank of a base material as well as a circulating anolyte overflowed from the anodic chamber is supplied and circulated from an anode circulating tank, and NaOH solution of low impurity concentration is supplied and circulated into the cathodic chamber through a tank of a refined solution. The concentration of the circulating anolyte is detected, and based on this detected value the supplying amount of the base NaOH solution is controlled and electrolysis is performed. Thus, the concentration of NaOH solution in the anodic chamber is kept stable, and the refined NaOH solution of low impurity concentration can be obtained in the cathodic chamber.
REFERENCES:
patent: 4532018 (1985-07-01), Wright et al.
patent: 6682701 (2004-01-01), Liu et al.
Manabe Takumi
Yamashita Tatsuro
Andrus Sceales Starke & Sawall LLP
Phasge Arun S,.
Tsurumi Soda Co., Ltd.
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