Method for obtaining lactide
US8592609B2 · kind B2 · utility
3Cited by
7References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2008 |
| Grant date | Nov 26, 2013 |
| Priority date | — |
| Expiry date | Feb 21, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D319/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Processes for producing lactide from lactic acid oligomers are described herein. The processes generally include heating a lactic acid oligomer in the presence of a catalyst at a temperature of between 150° C. and 300° C. under a pressure of less than 0.01 MPa to form a lactide; distilling the lactide; and condensing and recovering the lactide, wherein the catalyst is a metal salt of the phosphite anion PO33− in which the metal is selected from the group consisting of tin, aluminum, zinc, titanium and zirconium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.