Process for the production of chlorine dioxide

C - Chemistry – Metallurgy – 01 – B

Patent

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23/147, 8/79

C01B 11/02 (2006.01) D21C 9/14 (2006.01) D21C 9/147 (2006.01)

Patent

CA 2028550

A process for the production of chlorine dioxide by reacting in a reaction vessel an alkali metal chlorate, mineral acid and a reducing agent in such proportions that chlorine dioxide is produced in a reaction medium which is maintained at a temperature of from about 50 °C to about 100 °C and at an acidity within a range of from about 5 N to about 11 N. The reaction medium is subjected to subatmospheric pressure sufficient for evaporating water, a mixture of chlorine dioxide, oxygen and water vapour being withdrawn from an evaporation zone in the reaction vessel, and alkali metal sulfate being precipitated in a crystallization zone in the reaction vessel. As the reducing agent hydrogen peroxide is used.

Méthode pour la production de dioxyde de chlore, consistant à faire réagir, dans une cuve de réaction, un chlorate de métal alcalin, un acide minéral et un agent réducteur, en proportions telles que le dioxyde de chlore soit produit dans un milieu de réaction maintenu à une température d'environ 50 degrés C à environ 100 degrés C, et à une acidité se situant dans une plage d'environ 5N à environ 11N. Le milieu de réaction est soumis à une pression sous-atmosphérique, suffisante pour évaporer l'eau; un mélange de dioxyde de chlore, d'oxygène et de vapeur d'eau est retiré d'une zone d'évaporation de la cuve de réaction, et un sulfate de métal alcalin est précipité dans une zone de cristallisation de la cuve de réaction, à mesure que le peroxyde d'hydrogène, agent réducteur, est consommé.

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