Extraction of carboxylic acids from a dilute aqueous stream
US9102611B2 · kind B2 · utility
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Key dates
| Filing date | Jan 17, 2013 |
| Grant date | Aug 11, 2015 |
| Priority date | — |
| Expiry date | Jan 17, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/412
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for removing free carboxylic acid from an aqueous solution including a mass fraction of less than 1% wt of the free carboxylic acid. The process includes the steps of: (a) contacting the aqueous solution with a depleted solvent including a polyamine extractant to obtain an extract enriched in free carboxylic acid and a raffinate having a reduced free carboxylic acid content; and (b) separating the raffinate from the extract, wherein the polyamine extractant is a compound containing at least two nitrogen atoms, and at least one double bond between a nitrogen atom and a carbon atom.
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