Patent · US Active

Process for obtaining methionine

US9617209B2 · kind B2 · utility

0Cited by

9References

22Claims

0Family size

Assignee

EVONIK DEGUSSA GMBH · DE

Inventors

Stefan Reichert · Frankfurt, DE
Harald Jakob · Hasselroth, DE
Hans Joachim Hasselbach · Gelnhausen, DE
Martin Koerfer · Alzenau, DE

Key dates

Filing date	Sep 10, 2014
Grant date	Apr 11, 2017
Priority date	—
Expiry date	Sep 10, 2034

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07B2200/13
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a method for crystallizing D,L-methionine from aqueous solutions and/or suspensions containing D,L-methionine and D,L-methionine ammonium salts, having a Met content of 70-180 g/kg, an NH4 content of 1-5 g/kg, in the presence of a crystallization additive, which comprises a nonionic or anionic surfactant or a mixture of various nonionic or anionic surfactants, in which the temperature of the solution and/or suspension is lowered directly or stepwise from T1=85-110° C. to T2=30-50° C., so that D,L-methionine precipitates as a solid.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.