C - Chemistry – Metallurgy – 01 – D
Patent
C - Chemistry, Metallurgy
01
D
C01D 5/02 (2006.01) B01J 19/00 (2006.01) C01B 11/02 (2006.01) C01D 5/00 (2006.01)
Patent
CA 2108006
Sodium sesquisulfate produced in crystalline form in a high acidity methanol-based highly efficient chlorine dioxide generating process is converted by metathesis to crystalline anhydrous neutral sodium sulfate and the acid recovered as a result is recycled to the chlorine dioxide generating step. The metathesis is effected by contacting the crystalline sodium sesquisulfate with aqueous sodium chlorate solution, aqueous sodium 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.
On transforme par métathèse (32) en sulfate de sodium neutre, anhydre et cristallin (40) le sesquisulfate de sodium (30) sous forme cristalline produit par un processus de production de dioxyde de chlore très efficace, à base de méthanol et à acidité élevée. On renvoie (44) l'acide ainsi obtenu à l'étape de production de dioxyde de chlore (12). La métathèse s'effectue par la mise en contact du sesquisulfate cristallin de sodium avec une solution aqueuse de chlorate de sodium (34), une solution aqueuse de chlorure de sodium, du méthanol aqueux ou de l'eau uniquement. Ladite métathèse s'effectue de manière à minimiser la charge évaporative supplémentaire à laquelle est soumis le processus de production de dioxyde de chlore par le milieu de métathèse.
Bechberger Edward J.
Fredette Maurice C.j.
Scribner Herbert C.
Sim & Mcburney
Superior Plus Lp
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