FCC feed injection with non-quiescent mixing
US5358632A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1993 |
| Grant date | Oct 25, 1994 |
| Priority date | — |
| Expiry date | Jul 16, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G11/18
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An FCC feed distributor mixes fresh catalyst entering the riser with steam to create a dense bubbling bed of catalyst. Fluidized catalyst rises from the dense bed around a conical section supported from the bottom of the riser. The conical section accelerates the catalyst by reducing the flow area into a small width annulus. As fast fluidized catalyst flows to the annulus, a ring of small diameter nozzles shoot feed across the narrow annular gap into the moving catalyst. The narrow gap provides good penetration of the catalyst stream to completely mix the catalyst and feed. A gently tapered conical section above the annular gap provides an extended region of gradually increasing flow area that controls downstream acceleration of the gas and catalyst mixture by permitting expansion and preventing back mixing over the initial stages of the cracking reaction. This arrangement improves the uniformity of gas and catalyst contacting while reducing the amount of steam or other dispersion gas required to achieve good catalyst and feed contact.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.