The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 12, 1976
Filed:
Apr. 29, 1975
Jon Carl Thunberg, Amherst, NH (US);
Robert Wright Bragdon, Marblehead, MA (US);
William Philip Moore, Hudson, NH (US);
W. R. Grace & Co., New York, NY (US);
Abstract
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.