Process to make high-purity wet salt

Details Process to make high-purity wet salt Process to make high-purity wet salt

2005-03-15

2005-03-15

Silverman, Stanley S. (Department: 1754)

Chemistry: physical processes

Physical processes

Crystallization

C023S29500G

Reexamination Certificate

active

06866688

ABSTRACT:
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 crystals that are formed.

REFERENCES:
Patent abstracts of Japan abstracting Patent No.: JP 01-145320, Jul. 1989.
Laid Open Patent No. 1989-JP 01-145319, Jul. 1989.

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