Vented riser apparatus and method
This patent describes a process for the fluidized catalytic cracking (FCC) of an FCC feedstock. It comprises: passing the FCC feedstock and regenerated catalyst particles to a reactor riser and transporting the catalyst and feedstock upwardly through the riser thereby converting the feedstock to a gaseous product stream and producing spent catalyst particles by the deposition of coke on the regenerated catalyst particles; discharging a first mixture of spent catalyst particles and gaseous products directly into the dilute phase of a reactor vessel in an upward direction from a discharge end of the riser located from about 5 to about 12 riser diameters below the upper end of the reactor vessel thereby providing an initial separation of the spent catalyst from the gaseous products; passing separated catalyst downward through the vessel; maintaining the separated catalyst in the reactor vessel as a dense catalyst bed and passing a stripping gas upward through the reactor vessel; maintaining the upper surface of the dense catalyst bed a distance of between 3 to 8 feet of 1 to 4 riser diameters below the riser outlet end; passing the spent catalyst downwardly through the reactor vessel into a stripping zone and contacting the spent catalyst with the stripping gas; passing spent catalyst from the stripping zone into a regeneration zone and contacting the spent catalyst with a regeneration gas in the regeneration zone to combust coke from the catalyst particles and produce regenerated catalyst particles for transfer to the reactor riser; and withdrawing a second mixture of gaseous products, stripping fluid, and spent catalyst particles from the reactor vessel through a collector located in the reactor vessel above the dense catalyst bed about the periphery of the outlet end of the riser and transferring the mixture to a particle separator located outside of the reactor vessel.
- Assignee:
- UOP, Des Plaines, IL (United States)
- Patent Number(s):
- US 5104517; A
- Application Number:
- PPN: US 7-524525
- OSTI ID:
- 5157354
- Resource Relation:
- Patent File Date: 17 May 1990
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDROCARBONS
CATALYTIC CRACKING
PETROLEUM REFINERIES
CATALYSTS
CHEMICAL COMPOSITION
FLUIDIZED BEDS
MIXTURES
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
DISPERSIONS
INDUSTRIAL PLANTS
ORGANIC COMPOUNDS
PYROLYSIS
THERMOCHEMICAL PROCESSES
020400* - Petroleum- Processing
023000 - Petroleum- Properties & Composition
400201 - Chemical & Physicochemical Properties