Heavy oil hydroprocess including recovery of molybdenum catalyst
US4762812A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1985 |
| Grant date | Aug 9, 1988 |
| Priority date | — |
| Expiry date | Aug 21, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G49/18
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the recovery of a spent molybdenum catalyst from a hydroprocess for the upgrading of a nickel and vanadium containing hydrocarbonaceous mineral oil. The nickel and vanadium contaminated molybdenum catalyst is oxidized to convert the metals to oxides. Aqueous ammonia is added to preferentially dissolve molybdenum from nickel and vanadium. An amount of ammonia is used in excess of the amount required to produce an active catalyst for recycle and the excess ammonia is removed prior to recycle of the catalyst. The selectively of the separation of molybdenum from nickel and vanadium is improved by adding a reducing agent before or during the ammonia dissolving step. Hydrazine is a suitable reducing agent. The recovered molybdenum is sulfided and recycled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.