Method and apparatus for making aqueous chlorine dioxide

C - Chemistry – Metallurgy – 01 – B

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C01B 11/02 (2006.01) C02F 1/68 (2006.01) C02F 1/76 (2006.01)

Patent

CA 2247012

A method of forming an aqueous chlorine dioxide solution is disclosed which includes reacting in a reaction vessel an acid reaction solution containing a hydroxy carboxylic acid and a companion acid with an alkali metal salt of a chlorite ion. In accordance with the process, the hydroxy carboxylic acid serves to temporarily transfer chlorine from and does not form a salt with the alkali metal salt of a chlorite ion. The aqueous chlorine dioxide solution produced is substantially free of chlorous acid and preferably is free of other by-products such as sodium chloride and free chlorine. The method further includes maintaining the reaction vessel at a pH of less than 5 and/or withdrawing at least a portion of the chlorine dioxide from the aqueous chlorine dioxide solution. The method enables rapid, efficient, compact and safe generation of chlorine dioxide. A method of disinfecting water, and apparatus for making chlorine dioxide and for disinfecting water also are provided.

L'invention porte sur un procédé de production de solution aqueuse de dioxyde de chlore consistant à faire réagir dans une cuve à réaction une solution de réaction acide contenant un acide hydroxy-carboxylique et un acide d'accompagnement avec un sel de métal alcalin d'un ion chlorite. Au titre de ce procédé, l'acide hydroxy-carboxylique, qui sert à transférer provisoirement du chlore d'un sel de métal alcalin d'un ion chlorite, ne forme pas de sel avec le sel de métal alcalin d'un ion chlorite. La solution aqueuse de dioxyde de chlore produite est, dans une large mesure, exempte d'acide chloreux et, de préférence, également exempte d'autre sous-produits comme le chlorure de sodium et le chlore libre. Ce procédé consiste, en outre, à maintenir la cuve de réaction à un pH inférieur à 5 et/ou à retirer une partie au moins du dioxyde de chlore de la solution aqueuse de dioxyde de chlore. Ce procédé permet une production rapide, rentable et sécurisée, de dioxyde de chlore sous un petit volume. L'invention concerne également un procédé de désinfection de l'eau ainsi qu'un appareil de production de dioxyde de chlore et de désinfection de l'eau.

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