Process for continuously producing chlorine dioxide

Details Process for continuously producing chlorine dioxide Process for continuously producing chlorine dioxide

1993-02-26

1995-01-10

Straub, Gary P.

Chemistry of inorganic compounds

Halogen or compound thereof

Chlorine dioxide

25218721, C01B 1102

Patent

active

053805178

ABSTRACT:
A process for continuously producing chlorine dioxide by reacting an alkali metal chlorate, sulfuric acid or another chlorine free mineral acid and hydrogen peroxide as reducing agent to produce chlorine dioxide in an aqueous reaction medium. In the process chlorine dioxide is generated in at least one reaction step comprising at least one reaction vessel, by feeding alkali metal chlorate, acid, hydrogen peroxide and inert gas to said reaction vessel, in substantial absence of added chloride ions. The aqueous reaction medium in said reaction vessel is maintained at a pressure of from about 400 mm Hg to about 900 mm Hg and at a temperature of from about 35.degree. C. to about 100.degree. C. and at an acidity within a range from about 4 to about 14 N and the chlorate concentration of between about 0.05 moles/1 to saturation. Chlorine dioxide, oxygen and inert gas and the depleted aqueous reaction medium is withdrawn from said reaction zone without substantial crystallization of alkali metal sulfate.

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Abstract, European Patent Office, WPI, Section Ch, Week 9126, Derwent Publications, London, GB; Class E36, AN 91-188766 & JP-A-3 115 102 (Daiso Co Ltd) 16 May 1991.

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