FCC feed injection with non-quiescent mixing

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

1994-10-14

1996-10-08

Pal, Asok

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Solids contacting and mixing

208113, 208120, 208127, 208153, 208164, C10G 1118, C10G 3514

Patent

active

055628184

ABSTRACT:
An FCC feed distributor mixes fresh catalyst entering the riser with steam to cream 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 diverter outwardly redirects an axially flowing feed stream to discharge feed radially into the catalyst as it flows by the annular section. A narrow width of the annular section provides good penetration of the catalyst stream by the feed to quickly and completely mix the catalyst and feed. A tapered conical section above the narrow annular section 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: 4427538 (1984-01-01), Bartholic
patent: 4427539 (1984-01-01), Busch et al.
patent: 4427937 (1984-01-01), Dean et al.
patent: 4434049 (1984-02-01), Dean et al.
patent: 4479870 (1984-10-01), Hammersheimb et al.
patent: 4717467 (1988-01-01), Haddad et al.
patent: 5139748 (1992-08-01), Lomas et al.

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