Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Patent
1988-06-10
1990-12-25
Caldarola, Glenn
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
208251R, 502406, C10G 1100, C01B 1760, B01J 2002
Patent
active
049800507
ABSTRACT:
A catalytic cracking process for converting heavy, metals laden feed to lighter products is disclosed. The catalyst regenerator is operated under relatively reducing conditions, to produce a flue gas containing at least 1 mole % carbon monoxide. An additive, preferably alumina, is added to the circulating catalyst inventory to selectively sorb metal contaminants in the feed. The reducing conditions in the catalyst regenerator minimize formation of highly oxidized forms of vanadium, permitting higher vanadium levels to be tolerated on the cracking catalyst. The additive material has a greater affinity for vanadium than the cracking catalyst, and absorbs a disproportionate amount of metals in the feed. Preferably a soft, friable, alumina additive is used which results in the production of alumina fines rich in vanadium, which are discharged from the unit with catalyst fines. The process works especially well in fluidized catalytic cracking processes, with removal of vanadium laden alumina fines from the FCC regenerator with the regenerator flue gas.
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Huh Billy K.
Yan Tsoung Y.
Caldarola Glenn
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
Stone Richard D.
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