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US 12,006,277 B2Granted
Process for making solid methylglycine diacetate (MGDA) alkali metal salt, and solid particles
AssigneeBASF SE
InventorsFrank Jaekel, Michael Klemens Mueller
Life of this patent
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Abstract
A process for making solid methylglycine diacetate (MGDA) alkali metal salt (a) includes: (A) providing a 40 to 60% by weight aqueous solution of the MGDA salt having a temperature in the range of from 50 to 90° C., (B) adding solid salt (a), (C) heating the resultant slurry until the salt (a) added in step (B) has dissolved at least partially, (D) allowing salt (a) to crystallize, and (E) removing crystalline salt (a) from the mother liquor.
Claims6
A process for making a solid methylglycine diacetate (MGDA) alkali metal salt (a), said process comprising the steps of
- (A) providing a 40 to 60% by weight aqueous solution of said MGDA salt having a temperature in the range of from 50 to 90° C.,
- (B) adding solid salt (a),
- (C) heating the resultant slurry until the salt (a) added in step (B) has dissolved at least partially,
- (D) allowing salt (a) to crystallize, and
- (E) removing crystalline salt (a) from the mother liquor, wherein in step (C), the resultant slurry is heated until a clear solution is obtained, and wherein between steps (C) and (D), seed crystals of the salt (a) are added.
2 more elements
Dependencies are inferred from the claim text.