Process for regenerating fluorosulfuric acid catalyst
US4096199A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1977 |
| Grant date | Jun 20, 1978 |
| Priority date | — |
| Expiry date | Feb 28, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for regenerating an alkylation catalyst comprising fluorosulfuric acid, said catalyst being at least partially deactivated, which comprises: PA1 (1) contacting at least a portion of the fluorosulfuric acid with water to form an acid-water mixture, thereby converting at least a portion of the fluorosulfuric acid therein to hydrogen fluoride and sulfuric acid; PA1 (2) removing at least a portion of the hydrogen fluoride from said acid-water mixture formed in step (1) by contacting same with a stripping agent to form a gaseous phase containing hydrogen fluoride and said stripping agent and a liquid phase containing sulfuric acid and sludge; PA1 (3) cooling the gas phase formed in step (2) to a temperature sufficient to form a mixed phase comprising at least a liquid phase containing hydrogen fluoride; and PA1 (4) treating the mixed phase formed in step (3) with sulfur trioxide under substantially liquid phase conditions so as to regenerate the fluorosulfuric acid. In a preferred embodiment, at least a portion of the regenerated fluorosulfuric acid is recycled to the alkylation zone for use as an alkylation catalyst therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.