Fatty acid anhydride process
US5387705A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1993 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Aug 13, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11C3/00
- WIPO fieldFood chemistry
- WIPO sectorChemistry
Abstract
A fast, three-stage, low temperature process for the conversion of fatty acids into food grade-anhydrides is disclosed. The process comprises as a first step the reaction of a higher fatty acid with a dehydrating agent under mild conditions. A second process step comprises the further conversion of mixed anhydrides to symmetrical anhydrides by continuous removal of the dehydrating agent and by-product acid from the reaction mixture under vacuum. In a third process step, the symmetrical anhydrides are purified under mild conditions, preferably using thin-film short path evaporation. The resulting anhydrides have minimal by-products and good color and odor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.