Process to make high-purity wet salt, wet salt so...

Details Process to make high-purity wet salt, wet salt so... Process to make high-purity wet salt, wet salt so...

C - Chemistry, Metallurgy

01

D

C01D 3/24 (2006.01) C01D 3/16 (2006.01) C25B 1/26 (2006.01)

Patent

CA 2453180

The invention relates to an evaporative crystallization process to make salt compositions that includes a step wherein a mother liquor is formed that contains an effective amount of a crystal growth inhibitor that is selected from oligopeptides, polypeptides, and polymers bearing two or more carboxylic acid groups or carboxyalkyl groups and optionally further phosphate, phosphonate, phosphino, sulfate, and/or sulfonate groups, such as carboxymethyl cellulose with phosphate groups, to form salt crystals with a (111) face. The salt can be washed with a reduced amount of washing water while still containing lower amounts of K, Br, SO4, and/or Ca. A wet salt can be obtained by partially drying the salt crystal that are formed.

L'invention concerne un procédé de cristallisation par évaporation permettant de produire des compositions à base de sel. Ce procédé comprend une étape dans laquelle est formée une liqueur mère qui contient une quantité efficace d'un inhibiteur de croissance cristalline, sélectionné parmi des oligopeptides, des polypeptides et des polymères comportant au moins deux groupes acide carboxylique ou groupes carboxyalkyle et éventuellement d'autres groupes phosphate, phosphonate, phosphino, sulfate, et/ou sulfonate, tels que de la carboxyméthylcellulose avec des groupes phosphate, pour la formation de cristaux de sel présentant une face (111). Le sel peut être lavé avec une quantité réduite d'eau de lavage tout en contenant néanmoins de plus faibles quantités de K, Br, SO¿4?, et/ou Ca. Un sel humide peut être obtenu par séchage partiel des cristaux de sels formés.

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