Sulfolane purification by hydrocarbon extraction
US5264650A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1992 |
| Grant date | Nov 23, 1993 |
| Priority date | — |
| Expiry date | Dec 17, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2527/1206
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a method for separating conjunct polymers which are formed as byproducts of acid catalyzed isoparaffin-olefin alkylation and sulfolane from a mixture containing conjunct polymers, sulfolane, and hydrofluoric acid comprising the sequential steps of: PA1 (a) separating hydrofluoric acid from a mixture containing conjunct polymers, sulfolane, and hydrofluoric acid to provide a first intermediate stream containing less than about 30 percent hydrofluoric acid by weight; PA1 (b) mixing said intermediate stream with a nonpolar extraction solvent to provide a second intermediate stream; and PA1 (c) gravitationally separating said intermediate stream into a less dense extract stream enriched in conjunct polymers and a more dense liquid stream enriched in sulfolane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.