Azeotropic distillation of cyclic esters of hydroxy organic...

Details Azeotropic distillation of cyclic esters of hydroxy organic... Azeotropic distillation of cyclic esters of hydroxy organic...

B - Operations, Transporting

01

D

B01D 3/36 (2006.01) C07C 67/54 (2006.01) C07D 319/12 (2006.01)

Patent

CA 2440918

Cyclic esters of hydroxy organic acids can be produced and recovered via azeotropic distillation. In certain embodiments cyclic esters, such as glycolide and lactide, can be produced from a fermentation broth or other feed stream that comprises a hydroxy organic acid, an ammonium salt of a hydroxy organic acid, an amide of a hydroxy organic acid, or an ester of a hydroxy organic acid using azeotropic distillation. The hydroxy organic acid of the feed stream or the hydroxy organic acid derived from the feed stream by decomposition is reacted to produce the cyclic ester. In other embodiments a crude composition of a cyclic ester of an organic ester can be purified using azeotropic distillation.

Selon la présente invention, des esters cycliques d'acides organiques hydroxy peuvent être produits et récupérés par distillation azéotropique. Selon certains modes de réalisation, des esters cycliques, tels que du glycolide et du lactide, peuvent être produits à partir d'un bouillon de fermentation ou d'un autre flux d'alimentation qui comprend un acide organique hydroxy, un sel d'ammonium d'un acide organique hydroxy, un amide d'un acide organique hydroxy, ou un ester d'un acide organique hydroxy par distillation azéotropique. L'acide organique hydroxy du flux d'alimentation ou l'acide organique hydroxy organique dérivé du flux d'alimentation par décomposition est mis en réaction pour produire l'ester cyclique. Selon d'autres modes de réalisation, une composition brute d'un ester cyclique d'un ester organique peut être purifiée par distillation azéotropique.

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