Demetallization process for a conversion catalyst
US4267032A · kind A · utility
7Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1979 |
| Grant date | May 12, 1981 |
| Priority date | — |
| Expiry date | Oct 4, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G49/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed is an aqueous phase oxidation for removing at least a portion of metal contaminants such as nickel, vanadium, iron or copper from a catalyst used in a hydrocarbon conversion process. The aqueous phase oxidation comprises: contacting a sulfided metals contaminated catalyst with an aqueous solution comprising soluble metal nitrate ions and a catalytically effective concentration of nitrite ions. Optionally, the sulfided catalyst which has been oxidized can be further treated with an aqueous oxidative and/or reductive wash. The oxidative wash preferably follows the reductive wash for optimal results.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.