Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Patent
1983-08-23
1985-03-12
Gantz, Delbert E.
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
208120, 502 34, 502521, C10G 1100
Patent
active
045043809
ABSTRACT:
A method for passivating metal contaminants present in a hydrocarbon feedstock which become deposited on cracking catalyst is described. The method is directed at passing the cracking catalyst through a passivation zone having a reducing atmosphere maintained at an elevated temperature by the introduction of a process reducing gas. The unsaturated hydrocarbon content of the reducing gas is decreased prior to the introduction of the process reducing gas into the passivation zone to thereby lower the rate of coke formation. In a preferred embodiment process reducing gas is passed through a hydrogenation zone adapted to hydrogenate an unsaturated hydrocarbon present in the process reducing gas prior to the process reducing gas being added to the passivation zone.
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Reid Terry A.
Stuntz Gordon F.
Exxon Research and Engineering Co.
Gantz Delbert E.
Mazer Edward H.
North Robert J.
Prezlock Cynthia A.
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