FCC feed injection with non-quiescent mixing

Details FCC feed injection with non-quiescent mixing FCC feed injection with non-quiescent mixing

1993-07-16

1994-10-25

Pal, Asok

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Solids contacting and mixing

208113, 208164, C10G 1118, C10G 3514

Patent

active

053586328

ABSTRACT:
An FCC feed distributor mixes fresh catalyst entering the riser with steam to create a dense bubbling bed of catalyst. Fluidized catalyst rises from the dense bed around a conical section supported from the bottom of the riser. The conical section accelerates the catalyst by reducing the flow area into a small width annulus. As fast fluidized catalyst flows to the annulus, a ring of small diameter nozzles shoot feed across the narrow annular gap into the moving catalyst. The narrow gap provides good penetration of the catalyst stream to completely mix the catalyst and feed. A gently tapered conical section above the annular gap provides an extended region of gradually increasing flow area that controls downstream acceleration of the gas and catalyst mixture by permitting expansion and preventing back mixing over the initial stages of the cracking reaction. This arrangement improves the uniformity of gas and catalyst contacting while reducing the amount of steam or other dispersion gas required to achieve good catalyst and feed contact.

REFERENCES:
patent: 3071540 (1963-01-01), McMahon et al.
patent: 3261776 (1966-07-01), Baumann et al.
patent: 4427537 (1984-01-01), Dean et al.
patent: 4427538 (1984-01-01), Bartholic
patent: 4427539 (1984-01-01), Busch et al.
patent: 4434049 (1984-02-01), Dean et al.
patent: 4479870 (1984-10-01), Hammershaimb et al.
patent: 4717467 (1988-01-01), Haddad et al.
patent: 5139748 (1992-08-01), Lomas et al.

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