Quaternary carboxylate compositions for extracting C1 to C4 carboxylic acids from aqueous streams
US9573078B2 · kind B2 · utility
1Cited by
35References
30Claims
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Key dates
| Filing date | Dec 18, 2015 |
| Grant date | Feb 21, 2017 |
| Priority date | — |
| Expiry date | Dec 18, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/54
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention relates to solvents for extracting C1 to C4 carboxylic acids from aqueous streams. More specifically, the extraction solvents include one or more salts composed of a tetraalkylphosphonium cation and a carboxylate anion. The extraction solvents may further include one or more non-ionic liquid organic solvents as an enhancer. The extraction solvents are useful for extracting aqueous mixtures containing one or more lower carboxylic acids, such as monocarboxylic acids, alkoxycarboxylic acids, and halogen-containing carboxylic acids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.