Gas solid contact riser with redistribution

Details Gas solid contact riser with redistribution Gas solid contact riser with redistribution

1998-09-10

2000-11-14

Griffin, Walter D.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Solids contacting and mixing

208153, 208156, 208113, 422214, 422215, C10G 1116, B01J 808

Patent

active

061465194

ABSTRACT:
An dilute phase transport riser for the contacting of particles with a gas uses redistributors along the length of the riser to prevent the formation of localized regions of high particle concentration along the wall of the riser. A series of redistributors extend transversely across the riser to redistribute the particles and the gas. The redistributor can comprise radially extended spokes or simple rectangular grates spaced at regular intervals along the length of the riser. The arrangement is particularly suited for FCC application where the catalyst tends to form pickets or streamers of catalyst that may slip backward along the length of a vertical riser.

REFERENCES:
patent: 3071540 (1963-01-01), McMahon et al.
patent: 3799868 (1974-03-01), Gantt
patent: 4071573 (1978-01-01), Owen et al.
patent: 4434049 (1984-02-01), Dean et al.
patent: 4855111 (1989-08-01), Bader et al.
patent: 5139748 (1992-08-01), Lomas et al.
patent: 5453254 (1995-09-01), Lefers et al.
"Hydrodynamics of a Pilot-Plant Scale Regularly Packed Circulating Fluidized Bed," by A.G.J. van der Ham, W. Prins, and W.P.M. van Swaaij of Chemical Reaction Eng. Labs, Chemical Eng. Dept., Twente University, at an AIChE Symposium Series, Enschede, The Netherlands 1993, pp. 53-72.

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