Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Patent
1998-07-06
1999-11-16
Griffin, Walter D.
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
208106, 502 20, 502 21, B01J 2034, C10G 4702, C10G 1100
Patent
active
059851333
ABSTRACT:
Circulating equilibrium catalyst (ECAT) in a fluidized catalytic cracking (FCC) is gently attrited in an internal or closely coupled attriter to produce fines and attrited catalyst which is recycled to the FCC unit for fines removal. Average particle size of the circulating ECAT is slightly reduced coupled with some fines formation, improving fluidization. Some metals removal is possible as metals tend to accumulate on the surface of the ECAT. The existing fines removal equipment in the FCC is used to remove produced fines, though operating conditions may be altered to reduce particulates emissions during periods of catalyst attrition. A dual orifice plate attriter closely coupled with and discharging into the FCC regenerator is preferred, but a high velocity gas jet within the FCC regenerator may also be used. The process operates without a magnetic catalyst separation unit.
REFERENCES:
patent: 2994659 (1961-08-01), Slyngstad et al.
patent: 5275990 (1994-01-01), Clark et al.
patent: 5328594 (1994-07-01), Hettinger
patent: 5393412 (1995-02-01), Hettinger
patent: 5746321 (1998-05-01), Hettinger et al.
Griffin Walter D.
Hobbes Laurence P.
Marathon Ashland Petroleum LLC
Nguyen Tam M.
Stone Richard D.
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