Catalyst rejuvenation process
US5906953A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 1997 |
| Grant date | May 25, 1999 |
| Priority date | — |
| Expiry date | May 9, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J38/60
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process and apparatus for rejuvenating particulate used catalysts in a single rejuvenation vessel and providing a rejuvenated catalyst material having properties that result in activity substantially equal to new catalyst. The pressurizable vertically-oriented vessel has inlet and outlet openings for the catalyst and washing liquids, and is arranged to facilitate successive solvent liquid washing, water washings, and acid treatment steps for the used particulate catalyst provided in a bed in the vessel conical-shaped lower portion which contains catalyst rotary stirring means. After rejuvenation of the used catalyst, it is withdrawn from the vessel conical-shaped lower portion downwardly through a central withdrawal conduit and control valve for further processing. The water-soluble solvent and acid treatment liquids can be usually recovered by distillation for reuse in the catalyst rejuvenation process. The solvent-washed and acid-treated catalyst is separately heated and oxidized to remove carbon deposits and provide a completely rejuvenated catalyst material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.