Hydrodesulfurization process with parallel first stages in series with a unified second stage
US3968026A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1975 |
| Grant date | Jul 6, 1976 |
| Priority date | — |
| Expiry date | Apr 28, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G2300/107
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An asphaltene-containing oil hydrodesulfurization process employing parallel first stages in series with a unified second stage. The second stage catalyst comprises supported Group VI and Group VIII metals together with a promoting amount of Group IV-B metal. The catalyst in the first stage comprises supported Group VI and Group VIII metals without promotion with Group IV-B metal. In the process, deactivated non-promoted catalyst is replaced at least once from at least one of the parallel first stages while continuing to operate the other of the parallel first stages to supply a reduced oil flow to the second stage during the catalyst replacement step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.