Method of producing chlorine dioxide

C - Chemistry – Metallurgy – 01 – B

Patent

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C01B 11/02 (2006.01) C01D 5/00 (2006.01)

Patent

CA 2178043

The invention relates to a process of producing chlorine dioxide comprising the steps of reducing chlorate ions in an acid reaction medium maintained in a reaction zone of a chlorine dioxide generator, which reaction medium contains alkali metal ions and sulfate ions, so to form chlorine dioxide and a solid salt of acidic alkali metal sulfate. The process further comprises the steps of separating said solid acidic alkali metal sulfate from the reaction medium, contact- ing said solid acidic alkali metal sulfate with an acid aqueous medium in a mixing tank to effect at least partial conversion to neutral solid alkali metal sulfate, separating the at least partially neutralized solid alkali metal sulfate from the acid aqueous medium on a filter and forming an acid filtrate, feeding at least a portion of said acid filtrate to the mixing tank, and transferring an acid aqueous medium to the reaction zone of the chlorine dioxide generator, which acid aqueous medium is a portion of the acid filtrate or acid aqueous medium from the mixing tank or a mixture thereof.

L'invention porte sur un procédé pour la production de dioxyde de chlore, consistant à réduire les ions chlorate dans un milieu de réaction acide d'une zone de réaction d'un générateur de dioxyde de chlore - milieu qui renferme des ions de métal alcalin et des ions sulfate -, de façon à former du dioxyde de chlore et un sel solide de sulfate acide de métal alcalin. Le procédé se poursuit ensuite avec les étapes suivantes : séparer ce sulfate acide solide de métal alcalin du milieu de réaction; mettre en contact ledit sulfate acide solide de métal alcalin avec un milieu aqueux acide dans une cuve de mélange, de façon à le convertir au moins partiellement en sulfate neutre solide de métal alcalin; séparer le sulfate solide de métal alcalin, au moins partiellement neutralisé, du milieu aqueux acide sur un filtre, en formant un filtrat acide; introduire au moins une partie dudit filtrat acide dans la cuve de mélange, et transférer un milieu aqueux acide dans la zone de réaction du générateur de dioxyde de chlore, ledit milieu aqueux acide étant une portion du filtrat acide ou du milieu aqueux acide provenant de la cuve ou d'un mélange des deux.

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