Membrane cell chlor-alkali process having improved overall effic

Details Membrane cell chlor-alkali process having improved overall effic Membrane cell chlor-alkali process having improved overall effic

1979-03-28

1980-12-30

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204128, 204296, C25B 116, C25B 1308

Patent

active

042421845

ABSTRACT:
A process for the preparation of an alkali metal hydroxide and halogen from an alkali metal halide in a plurality of electrolytic cells, wherein each electrolytic cell is physically arranged in series with respect to the other electrolytic cells, the series having a first electrolytic cell and a last electrolytic cell, so that for a selected cell in the series, after the first electrolytic cell, catholyte alkali metal hydroxide from the catholyte chamber of a previous electrolytic cell is conveyed to the catholyte chamber of the selected electrolytic cell. The concentration of the alkali metal hydroxide is progressively increased toward a desired final concentration in the last cell through the series of electrolytic cells. Each electrolytic cell has an anolyte chamber containing an anode and a catholyte chamber containing a cathode, separated by a permselective membrane. The process of this invention is characterized by the improvement wherein the permselective membrane is employed to maximize cell power efficiency corresponding to the concentration of alkali metal hydroxide produced in the catholyte chamber of each cell.

REFERENCES:
patent: 4057474 (1977-11-01), Kurtz et al.
patent: 4076603 (1978-02-01), Anderson
patent: 4076604 (1978-02-01), Murayama et al.
patent: 4085071 (1978-04-01), Resnick et al.
patent: 4089759 (1978-05-01), Krumpelt et al.
patent: 4147600 (1979-04-01), Rutherford et al.

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