Process for the isolation of L-amino acids

Details Process for the isolation of L-amino acids Process for the isolation of L-amino acids

1988-01-21

1989-05-02

Reamer, James H.

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

Organic compounds

Carboxylic acids and salts thereof

562575, C07C 9912

Patent

active

048270296

ABSTRACT:
L-amino acids present in cleavage solutions obtained in the acylase-catalyzed cleavage of N-acetyl-D,L-amino acids are isolated by use of a strongly acidic ion exchanger in H+ form. First, the mother liquor from a previous treatment cycle is fed to the ion exchanger, and then the cleavage solution and finally the wash water and the discharge from the ion exchanger which is pH-controlled is analyzed into an "effluent water fraction", an "N-acetyl-D-amino acid fraction" and an "L-amino acid fraction". The last fraction is adjusted by addition of fresh cleavage solution to a pH of between 4.0 and 6.0, and from the mixture which is thus obtained the L-amino acid is isolated by crystallization. The mother liquor which is obtained is recycled back into a subsequent treatment cycle.

REFERENCES:
patent: 2949450 (1960-08-01), Stark
patent: 4133753 (1979-01-01), Takeuchi et al.
patent: 4496703 (1985-01-01), Steinmetzer
patent: 4584399 (1986-04-01), Portal et al.
patent: 4661629 (1987-04-01), Valus et al.

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