Abstract: The present invention relates to a method of obtaining lactide by means of a solvent of the ether class from a mixture that is in liquid form comprising lactide, meso-lactide, and other impurities.

Abstract: Method of polymerization for producing polylactic acid of configuration L or D, with number-average molecular weight between 60 000 and 200 000 having an insertion defect rate between 0 and 0.5 wt. % of polylactic acid and a racemization defect rate between 0 and 2.5 wt. % of polylactic acid, characterized in that the method is a bulk process comprising contacting, at a temperature between 170 and 200° C. and for a reaction time between 5 and 75 minutes, the corresponding lactide of stereochemical configuration L-L or D-D having an optical purity of L or D of at least 99.5 wt. % with at least one catalyst in the presence of an initiator to form poly-L-lactic acid or poly-D-lactic acid.

Abstract: The present invention relates to a method of obtaining lactide by means of a solvent of the ether class from a mixture that is in liquid form comprising lactide, meso-lactide, and other impurities.

Abstract: Continuous method for obtaining a lactic ester, characterised in that it comprises the following steps: a) esterification reaction of a composition comprising an alcohol in the presence of a composition comprising lactic acid in excess, b) extraction of a vapour phase from this reaction medium, containing lactic ester, alcohol, water and traces of lactic acid; c) distillation of the vapour phase obtained at step b) in order to recover the lactic ester, alcohol and water at the top; d) distillation of the fraction obtained at step c) in order to recover the purified lactic ester at the bottom.