Sodium chloride production process

C - Chemistry – Metallurgy – 01 – D

Patent

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Details

C01D 3/06 (2006.01) B01D 9/00 (2006.01)

Patent

CA 2731309

The present invention pertains to a process for producing sodium chloride comprising the steps of (i) preparing a brine comprising at least 150 g/l of sodium chloride by dissolving a sodium chloride source in water, (n) subjecting the resulting brine to a eutectic freeze crystallization step by indirect cooling of said brine, resulting in the formation of ice, sodium chloride dihydrate, and a mother liquor, (iii) separating the sodium chloride dihydrate formed in step (ii) from the ice and optionally mother liquor at the eutectic temperature, such that a sodium chloride dihydrate-rich stream is formed, and (iv) feeding said sodium chloride dihydrate-rich stream to a recrystallizer to form sodium chloride and a mother liquor.

La présente invention concerne un procédé de production de chlorure de sodium comprenant les étapes consistant (i) à préparer une saumure comprenant au moins 150 g/l de chlorure de sodium par dissolution dune source de chlorure de sodium dans de leau, (ii) à soumettre la saumure obtenue à une étape de cristallisation par congélation eutectique par refroidissement indirect de ladite saumure, aboutissant à la formation de glace, de dihydrate de chlorure de sodium, et dune liqueur mère, (iii) à séparer le dihydrate de chlorure de sodium formé dans létape (ii) de la glace et facultativement de la liqueur mère à la température eutectique, de telle sorte quun courant riche en dihydrate de chlorure de sodium se forme, et (iv) à introduire ledit courant riche en dihydrate de chlorure de sodium dans un recristalliseur pour former du chlorure de sodium et une liqueur mère.

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