Catalyst regeneration process including metal contaminants removal
US4454240A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 2, 1981 |
| Grant date | Jun 12, 1984 |
| Priority date | — |
| Expiry date | Nov 2, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J23/94
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Spent catalysts removed from a catalytic hydrogenation process for hydrocarbon feedstocks, and containing undesired metals contaminants deposits, are regenerated. 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. Carbon deposits are removed from the treated catalyst by carbon burnoff at 800.degree.-900.degree. F. temperature, using 1-6 V % oxygen in an inert gas mixture, after which the regenerated catalyst can be effectively reused in the catalytic process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.