Method for crystallizing .alpha.-L-aspartyl-L-phenylalanine meth

Details Method for crystallizing .alpha.-L-aspartyl-L-phenylalanine meth Method for crystallizing .alpha.-L-aspartyl-L-phenylalanine meth

1993-09-23

1994-09-13

Dees, Jose G.

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

Organic compounds

Carboxylic acid esters

C07C22900

Patent

active

053470354

ABSTRACT:
A method for crystallizing .alpha.-L-aspartyl-L-phenylalanine methyl ester from a hot aqueous solution containing .alpha.-L-aspartyl-L-phenylalanine methyl ester by cooling is disclosed, which comprises (i) continuously supplying a hot aqueous solution of .alpha.-L-aspartyl-L-phenylalanine methyl ester having a concentration such that the content of L-aspartyl-L-aspartyl-L-phenylalanine methyl esters is less than 0.6% by weight based on the weight of .alpha.-L-aspartyl-L-phenylalanine methyl ester in said solution, or if the content of L-aspartyl-L-aspartyl-L-phenylalanine methyl esters is 0.6% by weight or more based on the weight of .alpha.-L-aspartyl-L-phenylalanine methyl ester in said solution, to a crystallization vessel the temperature of which is lowered to that corresponding to the solubility of .alpha.-L-aspartyl-L-phenylalanine methyl ester or less, and (ii) continuously discharging the formed slurry from the crystallization vessel.

REFERENCES:
patent: 3833554 (1974-09-01), Ariyoshi et al.
patent: 4994605 (1991-02-01), Kishimoto et al.
Industrial Crystallization 78, Proceedings of the 7th Symposium on Industrial Crystallization Warsaw, Poland, 25-27 Sep. 1978.

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