Oxidative purification method for producing purified dry furan-2,5-dicarboxylic acid
US9156805B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2013 |
| Grant date | Oct 13, 2015 |
| Priority date | — |
| Expiry date | Nov 19, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D307/68
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a process to produce a dry purified carboxylic acid product comprising furan-2,5-dicarboxylic acid (FDCA). The process comprises oxidizing a feed stream comprising at least one oxidizable compound to generate a crude carboxylic acid slurry comprising FDCA, removing impurities from a crude carboxylic acid slurry via oxidative purification in a low temperature post-oxidation zone to form a low impurity slurry stream. The low impurity slurry stream is further treated in a high temperature post oxidation zone to produce a secondary oxidation slurry stream which is routed to a crystallization zone to from a crystallized slurry stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.