Hydrocarboxylation of methylene dipropionate in the presence of propionic acid and a heterogeneous catalyst
US8703999B2 · kind B2 · utility
1Cited by
64References
20Claims
0Family size
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Key dates
| Filing date | Mar 27, 2012 |
| Grant date | Apr 22, 2014 |
| Priority date | — |
| Expiry date | Apr 20, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C67/36
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a process for the production and purification of glycolic acid or glycolic acid derivatives by the carbonylation of methylene dipropionate in the presence of a solid acid catalyst and propionic acid. This invention discloses hydrocarboxylations and corresponding glycolic acid separations wherein the propionic acid stream is readily removed from the glycolic acid and the propionic acid is recycled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.