C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 63/08 (2006.01) C07D 319/12 (2006.01) C08G 63/06 (2006.01)
Patent
CA 2173616
A process for the continuous production of substantially purified lactide and lactide polymers from lactic acid or an ester of lactic acid including the steps of forming crude polylactic acid, preferably in the presence of a catalyst means in the case of the ester of lactic acid, to form a condensation reaction by-product and polylactic acid, and depolymerizing the polylactic acid in a lactide reactor to form crude lactide, followed by subsequent purification of the crude lactide in a distillation system. A purified lactide is then polymerized to form lactide polymers.
L'invention a pour objet un procédé pour la production continue de lactide sensiblement purifié et de polymères de lactide, à partir d'acide lactique ou d'un ester d'acide lactique. Ce procédé comprend les étapes consistant à former de l'acide polylactique brut, de préférence en présence d'un moyen formant catalyseur dans le cas de l'ester de l'acide lactique, à former un sous-produit de réaction de condensation et de l'acide polylactique, et à dépolymériser l'acide polylactique dans un réacteur de lactide pour former du lactide brut, et enfin à purifier le lactide brut dans un système de distillation. Un lactide purifié est ensuite polymérisé pour former des polymères de lactide.
Benson Richard Douglas
Borchardt Ronald Leo
Gruber Patrick Richard
Hall Eric Stanley
Iwen Matthew Lee
Cargill Incorporated
Robic
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