Partial CO combustion with staged regeneration of catalyst
Patent
·
OSTI ID:5426336
This paper describes a process for the regeneration of spent hydrocarbon conversion catalyst withdrawn from a fluidized reaction zone. The process comprises the steps of: passing to a lower locus of a combustion zone of a riser-type fluidized regeneration zone; spent catalyst from the reaction zone, a stream comprising regenerated catalyst from a hereinafter described dense bed regeneration zone, and a first oxygen containing regeneration gas stream in an amount sufficient to maintain fast fluidized conditions; oxidizing coke and coke combustion by-products in the combustion zone while transporting the spent and regenerated catalyst upward in cocurrent flow with rising regeneration gas; passing catalyst and regeneration gas upward in cocurrent flow and therein oxidizing coke and coke combustion by-products to produce partially regenerated catalyst and a spent first generation gas; discharging partially regenerated and regenerated catalyst and the spent first regeneration gas from an upper locus of the riser regeneration zone into a catalyst disengagement zone through an outlet means that effects at least a partial separation of catalyst and regeneration gas. Thereby causing an initial separation of catalyst and the spend first regeneration gas; allowing partially regenerated and regenerated catalyst discharged through the outlet means to settle downward through a dilute phase above a dense fluidized bed and introducing into the dense fluidized bed a second oxygen containing regeneration gas stream in a quantity at least sufficient to produce regenerated catalyst having less than 0.1 wt% coke and to oxidize essentially all of the carbon monoxide produced.
- Assignee:
- UOP, Des Plaines, IL
- Patent Number(s):
- US 4849091
- Application Number:
- PPN: US 7-182812A
- OSTI ID:
- 5426336
- Country of Publication:
- United States
- Language:
- English
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