Process for the production of chlorine dioxide

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

C - Chemistry, Metallurgy

01

B

23/147

C01B 11/02 (2006.01)

Patent

CA 2014691

A process for producing 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 maintained at a temperature of from about 50 °C to about 100 °C and at an acidity within a range of from about 2 to about 11 N. The reaction medium is subjected to subatmospheric pressure sufficient for evaporating water, a mixture of chlorine dioxide and water vapour being withdrawn from an evaporation zone in the reaction vessel and alkali metal sulfate being precipitated in a crystallization zone in the reaction vessel. A mixture of formaldehyde and methanol is used as reducing agent.

On décrit un procédé permettant de fabriquer du dioxyde de chlore en faisant réagir un chlorate d'un métal alcalin, un acide minéral et un agent réducteur en proportions telles que le dioxyde de chlore est obtenu dans un milieu réactionnel maintenu à une température variant d'environ 50 oC à environ 100 oC et à une acidité oscillant entre environ 2 N et environ 11 N. Le milieu réactionnel est exposé à une pression suffisamment inférieure à la pression atmosphérique pour évaporer l'eau, un mélange de dioxyde de chlore et de vapeur d'eau étant alors retiré de la zone d'évaporation et le sulfate de métal alcalin étant précipité dans la zone de cristallisation du réacteur. On utilise comme agent réducteur un mélange de formaldéhyde et de méthanol.

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