Method for recovering L-phenylalanine

Details Method for recovering L-phenylalanine Method for recovering L-phenylalanine

1995-05-16

1997-04-01

Chan, Nicky

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

Organic compounds

Sulfate esters

C07C30506

Patent

active

056167660

ABSTRACT:
The present invention provides crystals of L-phenylalanine monomethyl sulfate which have low solubility compared to L-tyrosine and D-phenylalanine. The L-phenylalanine monomethylsulfate crystals are obtained by subjecting a solution containing monomethyl sulfuric acid and phenylalanine to crystallization.
Further, the present invention also provides a process for recovering L-phenylalanine from a water layer by neutralizing the esterified reaction, extracting an ester of L-phenylalanine therefrom with an organic solvent, and recovering remaining L-phenylalanine in the water layer as L-phenylalanine monomethylsulfate. L-phenylalanine monomethyl sulfate is obtained by esterifying L-phenylalanine and methanol in the presence of sulfuric acid, neutralizing the esterified solution with a base in the presence of water, extracting the produced L-phenylalanine methyl ester from the neutralized solution with an organic solvent, and then crystallized the resultant water layer under acidic condition.

REFERENCES:
patent: 4399304 (1983-08-01), Matsuishi et al.
patent: 5118840 (1992-06-01), Kano et al.

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