Process for the synthesis of lactide or glycolide from lactic ac

Details Process for the synthesis of lactide or glycolide from lactic ac Process for the synthesis of lactide or glycolide from lactic ac

1993-09-30

1994-12-20

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31900

Patent

active

053747437

ABSTRACT:
A process for preparing lactide or glycolide from a lactic acid oligomer or glycolic acid oligomer is disclosed where the molecular weight of the synthesis reactor residue is controlled to no more than 1.2 times that in the feed. The process is carried out at 130.degree. to 280.degree. C. and preferably 180.degree. to 210.degree. C. using from 1 to 6 weight percent catalyst in the oligomer feed to the synthesis reactor. The catalysts are tin or tin compounds, yttrium or rare earth metal compounds, or antimony compounds which are known as alphahydroxycarboxylic acid cyclic dimerization or polymerization catalysts.

REFERENCES:
patent: 5023349 (1991-06-01), Bhatia
patent: 5028667 (1991-07-01), McLain et al.
patent: 5053522 (1991-10-01), Muller

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