Chemical process and production unit

Details Chemical process and production unit Chemical process and production unit

C - Chemistry, Metallurgy

01

B

C01B 11/02 (2006.01)

Patent

CA 2589721

The invention relates to a continuous process for producing chlorine dioxide comprising the steps of continuously: a) feeding to a reactor (1) an acid, hydrogen peroxide and alkali metal chlorate; b) reacting the alkali metal chlorate with the acid and the hydrogen peroxide to form a product stream (2) containing chlorine dioxide, oxygen and alkali metal salt of the acid, c) bringing the product stream from the reactor to an eductor (3) and mixing it with motive water fed to the eductor and thereby forming a diluted product stream; d) removing oxygen from the diluted product stream; e) withdrawing part of the diluted product stream (9), before, during or after the step of removing oxygen; f) adding water (11) to the non-withdrawn part of the diluted product stream to form a recycle stream (12); and, g) bringing the recycle stream (12) to the eductor and feeding it thereto as motive water (4). The invention further relates to a production unit for the production of an aqueous solution comprising chlorine dioxide.

L'invention porte sur un processus en continu de production de bioxyde de chlore comportant les étapes suivantes: a) apport à un réacteur (1) d'un acide, de peroxyde d'hydrogène et d'un chlorate de métal alcalin; b) réaction du chlorate avec l'acide et le peroxyde d'hydrogène donnant un flux (2) contenant du dioxyde de chlore, de l'oxygène et un sel de métal alcalin de l'acide; c) transfert du flux dans un éducteur (3) et mélange à de l'eau de manière à obtenir un flux de produit dilué; d) extraction de l'oxygène du flux de produits dilué; e) extraction d'une partie du flux de produits dilué (9), avant, pendant ou après l'étape d'extraction d'oxygène; f) adjonction d'eau motrice (11) à la partie restante du flux de produits dilué (9) pour former un flux (12) de recyclage; et, g) transfert du flux (12) de recyclage à l'éducteur et apport d'eau motrice (4) à l'éducteur. L'invention porte également sur l'unité de production de la solution aqueuse de bioxyde de chlore.

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