Process for regenerating fluorosulfuric acid catalyst
US4096197A · kind A · utility
Assignee
Inventor
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
An improved process for regenerating an alkylation catalyst comprising fluorosulfuric acid, said catalyst being at least partially deactivated, which comprises the method of: (1) removing a portion of the fluorosulfuric acid from said catalyst by contacting same with a paraffin to form a liquid acid phase containing fluorosulfuric acid and an organic sludge formed during said alkylation and a gas phase containing said paraffin and fluorosulfuric acid; (2) contacting the liquid acid phase formed in step (1) with water to form an acid-water mixture, thereby coverting at least a portion of the fluorosulfuric acid contained therein to hydrogen fluoride and sulfuric acid; (3) removing at least a portion of the hydrogen fluoride from said acid-water mixture formed in step (2) by contacting same with a paraffin to form a gaseous phase containing hydrogen fluoride and paraffin; and (4) treating the gas phases formed in steps (1) and (3) with sulfur trioxide 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.