C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/534.1
C07C 51/48 (2006.01)
Patent
CA 1046525
ABSTRACT OF THE DISCLOSURE Glycine can be recovered from an aqueous solution of glycine and sodium chloride having a mole ratio of glycine to sodium chloride of about 0.7-5:1 by: (a) adjusting the pH of the starting solution to 4.5-8.5 and evaporating water therefrom and cooling to precipitate glycine and to form a first mother liquor; (b) separating the precipitated glycine from the first mother liquor; and (c) recovering the separated glycine. Sodium chloride can be precipitated from the first mother liquor by evaporating water therefrom to form precipitated sodium chloride and a second mother liquor rich in glycine which can be separated from the precipitated sodium chloride and admixed with a second lot of the aqueous starting solution and processed therewith. Alternatively, the sodium chloride can be precipitated and separated before precipitating the glycine by: (a) evaporating sufficient water to cause sodium chloride to precipitate from the hot solution (mother liquor); (b) separating the precipitated sodium chloride from the hot mother liquor; (c) cooling the separated mother liquor to cause glycine to precipitate; and (d) separating the precipitated glycine from the cooled mother liquor. The cooled separated mother liquor can be admixed with a second lot of the aqueous starting solution and processed therewith.
250309
Bragdon Robert W.
Moore William P.
Thunberg Jon C.
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