Sulfolane purification method
US5276243A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1992 |
| Grant date | Jan 4, 1994 |
| 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 and sulfolane from a mixture containing conjunct polymers, sulfolane, and hydrofluoric acid comprising the sequential steps of: PA0 (a) separating hydrofluoric acid from said mixture to provide an intermediate stream containing less than about 30 percent hydrofluoric acid by weight; PA0 (b) gravitationally separating said intermediate stream into a sulfolane-enriched stream and a conjunct polymer-enriched stream; PA0 (c) contacting said sulfolane-enriched stream with a polar extraction solvent to provide an extract stream enriched in sulfolane and a raffinate stream enriched in conjunct polymers; PA0 (d) stripping the polar extraction solvent from said sulfolane-enriched extract stream; and PA0 (e) recovering sulfolane from said enriched stream of step (d).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.