Staged catalyst regeneration in a baffled fluidized bed
US6503460B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1999 |
| Grant date | Jan 7, 2003 |
| Priority date | — |
| Expiry date | Mar 17, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G11/182
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Staged combustion in a single regenerator of a FCC unit is disclosed. The regenerator has a spent catalyst distributor at the top of the catalyst bed, and an air grid at the lower end of the bed. A baffle separates the catalyst bed into upper and lower stages. Excess oxygen is present in the lower bed; partial CO combustion mode is maintained in the upper bed. The baffle inhibits backmixing flux to achieve sufficient staging to burn the catalyst clean under partial CO combustion. This achieves a clean burn of the catalyst in a single regenerator vessel in the partial CO combustion operating mode. Surprisingly, the baffle also reduces catalyst entrainment in the dilute phase, thereby cutting particulate emissions from the regenerator and reducing cyclone wear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.