Removing hydrocarbon impurities from acetic acid by ionic liquid extraction
US7812191B2 · kind B2 · utility
9Cited by
4References
5Claims
0Family size
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Key dates
| Filing date | May 7, 2008 |
| Grant date | Oct 12, 2010 |
| Priority date | — |
| Expiry date | Jan 20, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for removing hydrocarbon impurities from acetic acid is disclosed. The method comprises extracting acetic acid with a hydrophilic imidazolium salt. The imidazolium salt preferably has the general structure ofwherein XΘ is a counter ion and R1, R2, R3, R4, and R5 are independently selected from the group consisting of C1-C6 hydrocarbon substitutes. The method is useful for removing hydrocarbon impurities from the alkane distillation bottoms stream of a methanol carbonylation process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.