Method of purifying lactic acid esters

Details Method of purifying lactic acid esters Method of purifying lactic acid esters

2005-11-22

2005-11-22

Tsang, Cecilia J. (Department: 1625)

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

Organic compounds

Carboxylic acid esters

C562S580000

Reexamination Certificate

active

06967257

ABSTRACT:
The invention relates to a method of purifying lactic acid esters, wherein an impure lactic acid ester is subjected to a melt crystallization. The impure lactic acid contains not more than 10 wt. % of impurities, based on the total amount of ester, and has a chiral purity of more than 90%. The ester is derived from lactic acid and a C1–C18alcohol.

REFERENCES:
patent: 5264592 (1993-11-01), Fridman et al.
patent: 6310218 (2001-10-01), O'Brien et al.
Patent Abstracts of Japan, vol. 01, No. 1202 (C-432), Jun. 30, 1987.

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