FIELD: chemical or physical processes.
SUBSTANCE: invention relates to improvement of lactide purification method. Disclosed is a method of purifying lactide from initiating impurities of lactic acid, its linear oligomers and water by recrystallization from dried solvents selected from: diethyl ether, ethyl and isopropyl alcohols, with subsequent sublimation at pressure of 0.05 mm Hg.
EFFECT: obtaining lactide, free from a large amount of impurities of lactic acid, its oligomers and water, as well as cytoxic impurities, suitable for obtaining a polymer with high molecular weight values with a low molecular weight distribution index.
1 cl, 4 ex
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