Process to prepare salt

Details Process to prepare salt Process to prepare salt

C - Chemistry, Metallurgy

01

D

C01D 3/08 (2006.01) C01D 3/14 (2006.01)

Patent

CA 2598339

The present invention relates to a process to prepare salt comprising the following steps: (i) preparing an aqueous salt solution containing at least 100 g/l of sodium chloride and at least 0.01 ppm of polyvalent cations by dissolving a sodium chloride source in industrial water, (ii) adding an effective amount of at least one positive retention enhancing component to the aqueous salt solution, (iii) subsequently subjecting the solution to a nanofiltration step, thereby separating the solution into a retentate which is enriched for the polyvalent cations and a permeate which is the purified aqueous salt solution, and (iv) concentrating the permeate to produce salt.

Procédé d'élaboration de sel : (i) élaboration d'une solution saline aqueuse contenant au moins 100 g/l de chlorure de sodium et au moins 0,01 ppm de cations polyvalents par dissolution de source de chlorure dans de l'eau industrielle, (ii) adjonction de quantité efficace d'au moins une composante d'augmentation de rétention positive à la solution saline aqueuse, (iii) nanofiltration pour séparer ensuite la solution en rétentat enrichi pour les cations polyvalents et perméat constitué par ladite solution purifiée, et (iv) concentration du perméat pour la production de sel.

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