Passivation of metal contaminants in cat cracking
US4504379A · kind A · utility
46Cited by
23References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1983 |
| Grant date | Mar 12, 1985 |
| Priority date | — |
| Expiry date | Aug 23, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S502/521
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for passivating metal contaminants present in a hydrocarbon feedstock which become deposited on cracking catalyst is described. The method is directed at passing the cracking catalyst through a passivation zone having a reducing atmosphere maintained at an elevated temperature. The reducing atmosphere comprises a process reducing gas stream which has been passed through a guard bed adapted to selectively remove an unsaturated hydrocarbon prior to the process reducing gas being added to the passivation zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.