Claims
- 1. A process for the evaporative crystallization of high purity salt compositions from a mother liquor which comprises brine, said process comprising adding an effective amount of a crystal growth inhibitor to said mother liquor, wherein said crystal growth inhibitor is selected from oligopeptides, polypeptides, and polymers bearing at least two carboxylic acid groups, carboxyalkyl groups and combinations thereof and optionally at least one phosphate group, phosphonate group, phosphino group, sulfate group, sulfonate group, or mixtures thereof, wherein said effective amount is effective to form salt crystals with a (111) face, followed by evaporative crystallization thereby forming a high purity salt composition
- 2. The process of claim 1 wherein said high purity salt composition is subjected to a washing step.
- 3. The process of claim 1 wherein said high purity salt composition is subjected to a drying step wherein said salt is only partially dried, thereby forming a wet salt.
- 4. The process of claim 1 wherein said crystal growth inhibitor is carboxymethyl cellulose with phosphate groups.
- 5. The process of claim 1 wherein less than 300 mg but more than 10 mg of crystal growth inhibitor per kg of mother liquor is employed.
- 6. The process of claim 5 wherein more than 12.5 mg of crystal growth inhibitor per kg of mother liquor is employed.
- 7. The process of claim 6 wherein more than 14 mg of crystal growth inhibitor per kg of mother liquor is employed.
- 8. The process of claim 3 wherein said wet salt less than 10% by weight water.
- 9. The process of claim 8 wherein said wet salt contains less than 4% by weight water.
- 10. The process of claim 1 wherein said high purity salt composition is subjected to a drying step thereby forming a dried salt.
- 11. Electrolysis of a brine produced with salt produced by the process of claim 1.
- 12. Electrolysis in accordance with claim 11 wherein a membrane electrolysis cell is used.
Parent Case Info
[0001] The present application claims priority of U.S. provisional application No. 60/303,903 filed on Jul. 9, 2001.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60303903 |
Jul 2001 |
US |