Fluidized bed regeneration of carbon-contaminated catalysts using gas discharge nozzles of specific dimensions
A fluidized bed method for regeneration of carbon-contaminated catalysts, such as cracking catalysts, is described. The method requires at least a portion of the oxygen-containing gas needed for fluidization and burn-off of carbon deposits to be introduced as a separate stream into the dense phase of the fluidized catalyst, contained in the regeneration chamber, by means of a plurality of gas discharge nozzles. The nozzles are affixed to at least one manifold member substantially horizontally disposed at the lower end of the regeneration chamber. Catalyst attrition is reduced and backflow of catalyst particles into the nozzles is minimized by utilizing gas discharges which are restricted in internal cross-sectional area in their upstream portion connected to the manifold member and expanded in the internal cross-sectional area of their downstream portion.
- Assignee:
- Shell Oil Co.
- Patent Number(s):
- US 3974091
- OSTI ID:
- 7259531
- Resource Relation:
- Patent File Date: Filed date 2 May 1975
- Country of Publication:
- United States
- Language:
- English
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