Catalyst desulfurization of petroleum residua feedstocks
US4576710A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1984 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Nov 9, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G65/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An improved process for catalytic desulfurization of petroleum residua feedstocks to provide at least about 75% desulfurization of the liquid product while achieving low catalyst deactivation and increased catalyst age. In the process which uses an ebullated catalyst bed reactor, the reaction conditions are usually maintained at 790.degree.-860.degree. F. temperature, 1000-1800 psig hydrogen partial pressure, and 0.2-2.0 Vf/hr/Vr space velocity. To control carbon and metals deposition on the catalyst, used catalyst is withdrawn from the reactor, a minor portion of the catalyst is discarded to control metals deposition and maintain catalyst activity, and the remaining catalyst is regenerated to remove carbon by carbon burnoff and returned to the reactor for further use. If desired, the regenerated catalyst can be presulfided before returning it to the reactor. Following phase separation and distillation steps, the desulfurized hydrocarbon liquid products are withdrawn from the process. For feedstocks requiring higher desulfurization, two stages of catalytic reaction are provided in which the used catalyst is withdrawn from each stage reactor and regenerated to remove carbon and then…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.