FIELD: chemistry.
SUBSTANCE: present invention relates to a method of extracting lactide of polylactide (PL), in which a) PL is brought into contact with hydrolyzing medium in the melt and hydrolytically decomposed in PL oligomers with average molar mass Mn from 162 to 10,000 g/mol, measured by acid-base titration carboxyl groups, wherein hydrolyzing medium is added in amount of 50 mmol to 10 mol per kg of PL, and b) oligomers PL is subjected to cyclic depolymerization in lactide. Besides, the present invention relates to a device based on the device of hydrolysis and reactor depolymerization, that enables to perform the method described above.
EFFECT: essence of the method under the invention is a partial hydrolysis initially used polymer materials in combination with cyclic depolymerization.
24 cl, 4 dwg, 2 ex
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