C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 319/12 (2006.01) B01D 3/00 (2006.01) B01J 8/02 (2006.01) C07C 51/42 (2006.01) C08G 63/08 (2006.01) C08G 63/78 (2006.01)
Patent
CA 2698288
The present invention relates to a device for separating a biodegradable, intermolecular cyclic diester of an alpha-hydroxycarboxylic acid from material mixtures which contain in addition the alpha--hydroxycarboxylic acid of the diester corresponding thereto. In particular, the diester is thereby dilactide and the acid lactic acid. Furthermore, the present invention relates to a method for separating dilactide from material mixtures, which is based on a modified, distillative method. In addition, the present invention describes a polymerisation device, in particular for preparing polylactide. Likewise, purposes of use of both the devices and of the method are indicated.
L'invention concerne un dispositif utilisé pour séparer un diester cyclique intermoléculaire biodégradable d'un acide alpha-hydrocarboxylique, contenu dans des mélanges de substances, qui contiennent également l'acide alpha-hydroxycarboxylique correspondant du diester. Ledit diester est à cet effet notamment du dilactide et l'acide, de l'acide lactique. L'invention concerne en outre un procédé permettant de séparer du dilactide contenu dans des mélanges de substances, qui se fonde sur un procédé de distillation modifié. L'invention concerne par ailleurs un dispositif de polymérisation, notamment pour préparer du polyactide. L'invention concerne également des applications, aussi bien des dispositifs concernés que du procédé.
Hagen Rainer
Muehlbauer Udo
Bcf Llp
Uhde Inventa-Fischer Gmbh
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