Removal of acids from tertiary amide solvents
US8476424B2 · kind B2 · utility
0Cited by
49References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2009 |
| Grant date | Jul 2, 2013 |
| Priority date | — |
| Expiry date | May 27, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07H13/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of removing a carboxylic acid from a liquid that contains a tertiary amide solvent includes a step of contacting the liquid with an extraction medium comprising an amine. The amine is immiscible with both water and the tertiary amide solvent, and the contacting step forms a de-acidified phase containing the tertiary amide solvent and a phase containing the extraction medium and the carboxylic acid. Both the liquid that contains the tertiary amide solvent and the de-acidified phase may also contain a sucrose-6-acylate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.