Production of meso-lactide, D-lactide, and L-lactide by back biting of polylactide
AssigneeFuterro S.A.
InventorsChristian Penu, Benjamine Belloncle
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Abstract
Process for increasingly producing D-Lactide and meso lactide by depolymerizing by back biting polylactide (PLA) said process which comprises: (i) Depolymerizing polylactide into its corresponding dimeric cyclic esters by heating the polylactide in the presence of a catalyst system comprising a catalyst and a co-catalyst in a reaction zone at temperature and pressure at which the polylactide is molten; (ii) Forming a vapor product stream from the reaction zone; (iii) Removing the vapor product stream and optionally condense it; (iv) Recovering, either together or separately meso-lactide, D-lactide and L-lactide.
Claims5
Process for increasingly producing D-Lactide and meso lactide by depolymerizing by back biting polylactide (PLA) said process which comprises:
- (i) Depolymerizing polylactide into its corresponding dimeric cyclic esters by heating the polylactide in the presence of a catalyst system which comprises MgO as catalyst and a cycloalkylalkoxysilane represented by the general formula QQ′Si(O-alkyle)2, where the Q and Q′ are different and are alkyl or cycloalkyl radical containing from 1 to 8 carbon atoms as cocatalyst, or wherein the catalyst system comprises MgO as catalyst and cyclohexylmethyldimethoxysilane as cocatalyst in a reaction zone at temperature and pressure at which the polylactide is molten;
- (ii) Forming a vapor product stream from the reaction zone;
- (iii) Removing the vapor product stream and optionally condense it;
- (iv) Recovering, either together or separately meso-lactide, D-lactide and L-lactide.
Dependencies are inferred from the claim text.