Catalyst rejuvenation process for removal of metal contaminants
US4595666A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1984 |
| Grant date | Jun 17, 1986 |
| Priority date | — |
| Expiry date | Apr 30, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S502/516
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Spent catalysts removed from a catalytic hydrogenation process for hydrocarbon feedstocks, and containing carbon undesired metals contaminants deposits, are rejuvenated for reuse. Following solvent washing to remove process oils, the catalyst is treated either with chemicals which form sulfate or oxysulfate compounds with the metals contaminants, or with acids which remove the metal contaminants, such as 5-50 W % sulfuric acid in aqueous solution and 0-10 W % ammonium ion solutions to substantially remove the metals deposits. The acid treating occurs within the temperature range of 60.degree.-250.degree. F. for 5-120 minutes at substantially atmospheric pressure, after which the rejuvenated catalyst containing carbon deposits can be effectively reused in the catalytic hydrogenation process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.