Metathesis of acidic by-product of chlorine dioxide...

Details Metathesis of acidic by-product of chlorine dioxide... Metathesis of acidic by-product of chlorine dioxide...

C - Chemistry, Metallurgy

01

B

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

Patent

CA 2148462

Sodium sesquisulfate produced in crystalline form in a high acidity highly efficient chlorine dioxide generating process (#12) as shown in the figure is converted by metathesis to crystalline anhydrous neutral sodium sulfate (#40) and the acid recovered as a result is recycled (#44) to the chlorine dioxide generating step. The metathesis (#32) is effected by contacting the crystalline sodium sesquisulfate with aqueous sodium chlorate solution (34) aqueous chloride solution, aqueous methanol or water alone: The metathesis is effected in such manner as to minimize the additional evaporative load imposed on the chlorine dioxide generating process by the metathesis medium:

Du sesquisulfate de sodium obtenu sous forme cristalline au cours d'un procédé (12) de génération de dioxyde de chlore à acidité élevée et à grande efficacité illustré dans la figure, est converti par métathèse en sulfate de sodium neutre anhydride cristallin (40). L'acide récupéré lors de ce procédé est recyclé (44) vers l'étape de génération de dioxyde de chlore. On effectue la métathèse en mettant en contact le sesquisulfate avec une solution de chlorate de sodium (34), une solution de chlorure aqueuse, du méthanol aqueux ou bien uniquement de l'eau. La métathèse est effectuée de façon à minimiser la charge d'évaporation supplémentaire imposée sur le procédé de génération de dioxyde de chlore par le milieu de métathèse.

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