Methods for separating hydrocarbons by liquid extraction
US4421640A · kind A · utility
4Cited by
5References
5Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 16, 1982 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | Feb 16, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C7/10
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Aromatic hydrocarbons are separated from a mixture thereof with paraffinic hydrocarbons by solvent extraction with N-(2-hydroxyethyl)-2-pyrrolidone containing a minor amount of water at specified elevated temperatures and pressures. Temperature variations within the specified range have little effect on the loading capacity and selectivity of the solvent thus greatly simplifying process control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.