Catalyst – solid sorbent – or support therefor: product or process – Regenerating or rehabilitating catalyst or sorbent – Gas or vapor treating
Patent
1990-12-28
1992-05-05
Konopka, Paul E.
Catalyst, solid sorbent, or support therefor: product or process
Regenerating or rehabilitating catalyst or sorbent
Gas or vapor treating
208113, 208120, 208164, 422144, 502 42, 502 44, B01J 3834, B01J 3836, B01J 2938, C10G 1118
Patent
active
051107759
ABSTRACT:
A two-stage process and apparatus for the regeneration of fluidized catalytic cracking (FCC) catalyst is disclosed. A primary regenerator, a single dense bed with a spent catalyst inlet, a source of oxygen-containing gas, a flue gas outlet and a regenerated catalyst outlet, is supplemented with a secondary regenerator. The secondary regenerator has its own source of air for combustion and takes particles from a lower portion of the dense bed in the primary regenerator. Combustion gases, and some solids, are discharged from the secondary regenerator into the primary regenerator. Hot, decoked material is withdrawn from the base of the secondary regenerator for use in the catalytic cracking reaction. Preferably, a dense, fast settling additive is used with a conventionally sized FCC catalyst. These two materials can be added together to the primary regenerator and separated by elutriation therein into two catalyst phases. Preferably most of the conventionally sized FCC catalyst is regenerated in the primary regenerator, while most of the denser additive is decoked in the secondary regenerator. Additive can be used to thermally shock heavy feeds, such as a resid, and remove a majority of the coke and metal contaminants of the resid upstream of a riser cracking reaction zone wherein the conventionally sized FCC catalyst is added.
REFERENCES:
patent: 2861947 (1958-11-01), Nicholson
patent: 4289605 (1981-09-01), Bartholic
patent: 4861741 (1989-08-01), Herbst et al.
patent: 4895636 (1990-01-01), Chen et al.
patent: 4980050 (1990-12-01), Huh et al.
Konopka Paul E.
McKillop A. J.
Mobil Oil Corporation
Speciale C. J.
Stone Richard D.
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