Catalytic cracking process and apparatus with refluxed spent catalyst stripper
US5248408A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1991 |
| Grant date | Sep 28, 1993 |
| Priority date | — |
| Expiry date | Mar 25, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G11/182
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A fluidized catalytic cracking process and apparatus operates with a single or multi- stage refluxed catalyst stripper. Recycle, or reflux, of stripped catalyst to the stripping zone improves stripping. Preferably, a two stage hot stripper is used. Addition of regenerated catalyst to spent catalyst from the reactor heats spent catalyst in a first stripping stage, which preferably uses stripping steam. Catalyst from the first stripping stage passes up through a second stage stripping zone with a heat removal means, e.g., a stab-in tube bundle. Steam or flue gas fluidizes catalyst, improves heat transfer and strips the catalyst. Some catalyst from the second stage stripper is preferably recycled to the inlet to the first stripping stage. Additional hot regenerated catalyst may be added downstream of the first catalyst stage to heat the second stripping stage, added to catalyst removed from the primary stripping zone which is sent to the regeneration zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.