Process for production of chlorine dioxide

Details Process for production of chlorine dioxide Process for production of chlorine dioxide

1989-10-10

1990-07-03

Russel, Jeffrey E.

Chemistry of inorganic compounds

Halogen or compound thereof

Chlorine dioxide

423532, C01B 1102, C01B 1774

Patent

active

049389432

ABSTRACT:
The present invention relates to a process for production of chlorine dioxide by reacting in a reaction vessel an alkali metal chlorate, sulfuric acid and a reducing agent, preferably methanol, in proportions to generate chlorine dioxide in a reaction medium maintained at a temperature from about 50.degree. C. to about 100.degree. C. and an acidity within the interval from 4.8 to 11 N and subjected to a subatmospheric pressure sufficient to effect evaporation of water. A mixture of chlorine dioxide and water vapour is withdrawn from an evaporation region in the reaction vessel and alkali metal sulfate is precipitated in a crystallization region in the reaction vessel. The alkali metal sulfate, which is an alkali metal sesquisulfate, from the crystallization region is heated to the formation of gaseous sulfur trioxide and a neutral alkali metal sulfate. The gaseous sulfur trioxide is absorbed in water to the formation of sulfuric acid. The sulfuric acid formed can be recirculated to the reaction vessel for chlorine dioxide production.

REFERENCES:
patent: 378774 (1888-02-01), Grousilliers
patent: 3563702 (1971-02-01), de Vere Partridge et al.
patent: 3864456 (1975-02-01), Winfield et al.
patent: 3933988 (1976-01-01), Rosen
patent: 4081520 (1978-03-01), Swindells et al.
patent: 4145401 (1979-03-01), Swindells et al.
patent: 4465658 (1984-08-01), Fredette
patent: 4473540 (1984-09-01), Fredette

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