摘要 |
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 C<SUB>1</SUB>-C<SUB>18 </SUB>alcohol. |