A process for the preparation of stable iodate-exchanged...

C - Chemistry – Metallurgy – 01 – F

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C01F 7/00 (2006.01) A23L 1/304 (2006.01)

Patent

CA 2713315

The present invention relates to a process for the preparation of stable iodate-exchanged hydrotalcite with zero effluent discharge. The iodate-exchanged hydrotalcite produced is useful as iodizing agent. The invention further relates to utilization of alkaline effluent generated in the process of ion exchange of iodate into SHT so as to fully recycle the residual iodate anion and also utilize the alkali generated in the process for production of additional quantities of iodate through reaction with iodine crystals followed by electrochemical oxidation to obtain pure aqueous solution of iodate salt which can be reused for preparation of the stable iodizing agent. The process gives zero effluent discharge hence economical.

L'invention concerne un procédé de préparation d'hydrotalcite stable à échange de iodate n'engendrant aucune décharge d'effluent. L'hydrotalcite à échange de iodate produite est utile comme agent iodant. L'invention concerne de plus l'utilisation d'un effluent alcalin produit dans le procédé d'échange ionique de iodate en SHT pour recycler entièrement l'anion iodate résiduel, et utiliser aussi l'alcali produit dans le procédé afin de produire des quantités supplémentaires de iodate par une mise en réaction avec des cristaux d'iode, suivie d'une oxydation électrochimique pour obtenir une solution aqueuse pure de sel de iodate pouvant être réutilisée en vue de préparer l'agent iodant stable. Ce procédé n'engendre aucune décharge d'effluent et est par conséquent économique.

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