Production of chlorine dioxide employing chloric acid - alkali m

Details Production of chlorine dioxide employing chloric acid - alkali m Production of chlorine dioxide employing chloric acid - alkali m

1992-07-24

1993-11-23

Niebling, John

Chemistry: electrical and wave energy

Processes and products

204 98, 204101, 204103, 423475, 423477, C25B 126

Patent

active

052640892

ABSTRACT:
A continuous process for producing chlorine dioxide which comprises feeding an aqueous solution of an alkali metal chlorate to a first ion exchange compartment of an electrolytic cell having an anode compartment, a cathode compartment and at least one ion exchange compartment between the anode compartment and the cathode compartment, electrolyzing an anolyte in the anode compartment to generate hydrogen ions, passing the hydrogen ions from the anode compartment through a cation exchange membrane into the first ion exchange compartment to displace alkali metal ions and produce an aqueous solution of chloric acid and alkali metal chlorate, passing alkali metal ions from the first ion exchange compartment into the cathode compartment, and reacting in a chlorine dioxide generator the aqueous solution of chloric acid and alkali metal chlorate substantially free of anionic and cationic impurities with a reducing agent which does not form persistent anions in the generator solution, to generate chlorine dioxide and to form an alkali metal chlorate precipitate. The alkali metal chlorate precipitate is recycled by dissolving the precipitate into the alkali metal chlorate feed stream that is fed to the first ion exchange compartment of the electrolytic cell.

REFERENCES:
patent: 3810969 (1974-05-01), Schlumberger
patent: 4486399 (1984-12-01), Lobley
patent: 4683039 (1987-07-01), Twardowski et al.
patent: 4798715 (1989-01-01), Hardee et al.
patent: 4915927 (1990-04-01), Lipsztajn et al.
patent: 5084148 (1992-01-01), Kazcur et al.

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