Apparatus and method for regenerating coked fluid cracking catalyst
This patent describes a continuous counterflow two-stage method for regenrating hot coked FCC catalyst discharged from a FCC reactor, each of which stages produces a distinct flue gas. The FCC catalyst comprising an acidic cracking component and a SO/sub chi/-transfer agent. The method comprises as concurrent steps: passing the hot coked catalyst and first-stage fluidizing gas containing all of the second-stage flue gas having more than 2 volume percent residual free oxygen and an ecologically excessive concentration of NO/sub chi/ to a first-stage riser unit under conditions effective to burn off 10 to 50 percent of the coke whereby forming partially regenerated catalyst and a first-stage flue gas depleted of NO/sub chi/ and containing less than 2 volume percent of residual free oxygen; passing the partially regenerated catalyst and second-stage fluidizing gas consisting of fresh regeneration gas to a second stage riser unit under conditions effective to produce regenerated catalyst containing entrained SO/sub chi/ and a second-stage flue gas containing more than 2 volume percent of residual free oxygen and an ecologically excessive concentration of NO/sub chi/; discharging the first-stage flue gas depleted of NO/sub chi/ from the first-stage riser unit; and passing the regenerated catalyst containing entrained SO/sub chi/ back to the FCC reactor.
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4851374
- Application Number:
- PPN: US 7056082A
- OSTI ID:
- 5393530
- Resource Relation:
- Patent File Date: 29 May 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CATALYSTS
REGENERATION
PETROLEUM REFINERIES
AIR POLLUTION CONTROL
CATALYTIC CRACKING
CHEMICAL REACTORS
EMISSION
FLUE GAS
NITROGEN OXIDES
SYNTHESIS GAS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
CRACKING
DECOMPOSITION
FLUIDS
GASEOUS WASTES
GASES
INDUSTRIAL PLANTS
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PYROLYSIS
THERMOCHEMICAL PROCESSES
WASTES
020400* - Petroleum- Processing
020900 - Petroleum- Environmental Aspects