Process for producing methionine

Details Process for producing methionine Process for producing methionine

1997-10-27

1999-08-31

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

C07C32100

Patent

active

059455632

ABSTRACT:
Methionine is produced in an improved yield while reducing the load of waste water disposal by a process including the steps of:
(A) adding at least one compound selected from potassium carbonate, potassium bicarbonate and potassium hydroxide to a solution containing 5-(.beta.-methylmercaptoethyl)hydantoin, (B) saturating the resulting solution with carbon dioxide gas and separating deposited methionine while leaving a first filtrate behind,
(C) transferring part or whole of the first filtrate to step (D),
(D) heating the transferred filtrate, adding a water-miscible solvent to it and saturating it with carbon dioxide gas to deposit methionine and potassium bicarbonate, and separating these deposits while leaving a second filtrate behind, and
(E) returning the second filtrate to step (A) if desired.

REFERENCES:
patent: 4069251 (1978-01-01), Mannsfeld et al.
patent: 4272631 (1981-06-01), Schaaf et al.
patent: 4303621 (1981-12-01), Lussling et al.

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