Process for purifying a crude composition of dialkyl ester of 2,5-furandicarboxylic acid
US10167268B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 2015 |
| Grant date | Jan 1, 2019 |
| Priority date | — |
| Expiry date | Nov 10, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D307/68
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An ester composition including at least 90% wt of the dialkyi ester of 2,5-furandicarboxylic acid as starting dialkyi ester concentration and up to 5% wt of the monoalkyi ester of 2,5-furandicarboxylic acid as starting monoalkyi ester concentration, the percentages being based on the weight of the ester composition, is purified in a process which includes subjecting the ester composition to melt crystallization to yield a purified dialkyi ester composition containing a dialkyi ester concentration higher than the starting dialkyi ester concentration and a melt residue containing a monoalkyi ester concentration higher than the starting monoalkyi ester concentration. From the melt residue a purified monoalkyi ester composition and a contaminants-rich residue can be prepared via melt crystallization. The purified dialkyi ester composition and/or the purified monoalkyi ester composition can be hydrolyzed to yield purified 2,5-furandicarboxylic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.