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

1987-06-09

1988-03-22

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

424 72, 562401, 562402, 562557, C07C 51487, C07B 5700

Patent

active

047330104

ABSTRACT:
Hydrochloric acid is added to a solution containing 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 20.degree. C. 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 10.degree. C., so that crystallization may take place to form the monohydrate of L-cysteine hydrochloride. The monohydrate is separated from the L-serine in the solution.

REFERENCES:
patent: 2178510 (1939-10-01), Gerber
patent: 2456742 (1948-12-01), Shabica
patent: 2816915 (1957-12-01), Gregory
patent: 2898358 (1959-08-01), Dowling
patent: 3433832 (1969-03-01), Swanson et al.
patent: 4613688 (1986-09-01), Inoue et al.

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