Process and apparatus for hot catalyst stripping in a bubbling b

Details Process and apparatus for hot catalyst stripping in a bubbling b Process and apparatus for hot catalyst stripping in a bubbling b

1990-04-27

1991-07-16

McFarlane, Anthony

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208158, 208159, 208160, 208164, 502 40, 502 43, 502 44, C10G 1100, C10G 3510, B01J 2034

Patent

active

050322524

ABSTRACT:
A process and apparatus for achieving multistage, hot catalyst stripping of spent FCC catalyst in a bubbling bed regenerator having a stripper mounted over the regenerator and a stripped catalyst standpipe within the regenerator. A secondary or hot catalyst stripper is placed under the primary stripper and within the existing regenerator vessel. Spent catalyst from the primary stripper is heated in the secondary stripper by at least one of immersion in the bubbling dense bed of hot regenerated catalyst, addition of hot regenerated catalyst recovered from the discharged into the coke combustor and regenerated in a turbulent or fast fluidized bed, and discharged up into a dilute phase transport riser which preferably encompasses, and is in a countercurrent heat exchange relationship with, the spent catalyst standpipe. Regenerated catalyst is discharged from the dilute phase transport riser, and collected in the bubbling dense bed surrounding the coke combustor. Catalyst may be recycled from the dense bed to the coke combustor for direct contact heat exchange. Catalyst coolers may be used on catalyst recycle lines to the coke combustor, or on the line returning regenerated catalyst to the cracking reactor.

REFERENCES:
patent: 4385985 (1983-05-01), Gross et al.
patent: 4574044 (1986-03-01), Krug
patent: 4789458 (1988-12-01), Haddad et al.
patent: 4820404 (1989-04-01), Owen
Oil and Gas Journal, "Fluid Catalytic Cracking Report" by Amos A. Avidan, Michael Edwards, and Hartley Owen.

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