Process for catalyst preparation for the hydrodemetallization of heavy crudes and residues
US4525472A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1983 |
| Grant date | Jun 25, 1985 |
| Priority date | — |
| Expiry date | Feb 23, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2235/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalyst for the hydrotreatment of heavy crudes and residues and a method for the preparation thereof are claimed, specifying an amount of Group VIb metallic hydrogenation compound irreversibly absorbed by the silica or alumina extruded support structure surface to be between 0.5 and 3% of the dried and calcined catalyst by weight. The percentage limit on the hydrogenation compound can be achieved by either obtaining a dense alumina support structure having a novel pore diameter distribution, or treating a prior art support with an absorption site restricter such as MgO prior to hydrogenation compound impregnation. Subsequent fabrication steps comprise washing, drying, calcining and presulfurizing. The resultant catalyst has a monolayer of hydrogenating compound deposited on the reaction surface, and interfering compounds such as massive MoO.sub.3, Al(MoO.sub.4).sub.3 or polymolybdates are not formed. The unimetallic catalyst is demonstrated to be comparable or superior to a bimetallic catalyst employing five times as much hydrogenating metal, and has superior service life due to uniform metal contaminant deposition throughout the catalyst interior.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.