Process for preparing dry crystals of the methyl ester of .alpha

Details Process for preparing dry crystals of the methyl ester of .alpha Process for preparing dry crystals of the methyl ester of .alpha

1995-02-28

1996-08-06

Reamer, James H.

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

Organic compounds

Carboxylic acid esters

C07C22742

Patent

active

055435548

ABSTRACT:
A process for obtaining dry crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester having a water content of about 2 wt. % to about 6 wt. % based on the weight of the wet crystals is disclosed. This process comprises exposing wet crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester, having a water content not greater than 50 wt. % based on the weight of the wet crystals and obtained by the crystallization of .alpha.-L-aspartyl-L-phenylalanine methyl ester from an unagitated solution of .alpha.-L-aspartyl-L-phenylalanine methyl ester, to a flow of air having a temperature of 80.degree. C. to 200.degree. C.

REFERENCES:
patent: 4810818 (1989-03-01), Wakamatsu et al.
patent: 4831180 (1989-05-01), Wakamatsu et al.
patent: 4835301 (1989-05-01), Wakamatsu et al.
patent: 4835303 (1989-05-01), Wakamatsu et al.
patent: 4900863 (1990-02-01), Schmidt et al.
Kirk-Othmer Encyclopedia of Chemical Technology, vol. 6 (1965) 2ND Edition pp. 499-500.
McCabe et al., Unit Operations of Chemical Engineering, (1976) pp. 853-890.

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