Process for the production of chlorine dioxide

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

1989-02-28

1990-12-18

Russel, Jeffrey E.

Chemistry of inorganic compounds

Halogen or compound thereof

Chlorine dioxide

C01B 1102

Patent

active

049785176

ABSTRACT:
A process for production of chlorine dioxide by reacting in a reaction vessel an alkali metal chlorate, a mineral acid and methanol as a reducing agent 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 at an acidity within the interval from about 2 to about 11N and subjected to an subatmospheric pressure. Thereby water is evaporated and a mixture of chorine dioxide, water vapor and gaseous by-products is withdrawn from an evaporation region in the reaction vessel. The alkali metal sulphate is precipitated in a crystallization region in the reaction vessel. The content of formic acid in the reaction vessel is increased by addition of formic acid to a content of formic acid exceeding about 0.3M. The gaseous by-products are condensed to obtain formic acid and the content of formic acid in the reaction vessel is increased by recirculation of the condensate.

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Applegate, L. E., Membrane Separation Processes, Chemical Engineering, vol. 91, No. 12, 6/11/84, p. 87.

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