Method of separating monohydrate of l-cysteine hydrochloride

Details Method of separating monohydrate of l-cysteine hydrochloride Method of separating monohydrate of l-cysteine hydrochloride

C - Chemistry, Metallurgy

07

C

260/534.1

C07C 319/28 (2006.01) C07C 323/58 (2006.01) C12P 13/12 (2006.01)

Patent

CA 1285958

ABSTRACT OF THE DISCLOSURE Hydrochloric acid is added to a solution contain- ing L-cysteine, L-cystine, L-serine and an inorganic salt until it contains at least 15% by weight of hydrochloric acid. The solution is held at a temperature of at least 20C so that the L-cystine and the inorganic salt may form a solid, and the solid is removed from the solution. The solution is cooled to a temperature not exceeding 10C, so that crystallization may take place to form the mono- hydrate of L-cysteine hydrochloride. The monohydrate is separated from the L-serine in the solution.

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