Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1977-11-11
1979-11-27
Konopka, P. E.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
208113, 208120, 208164, 252419, B01J 2120, B01J 2938, C10G 1104, C10G 1118
Patent
active
041760840
ABSTRACT:
Hydrocarbon conversion catalysts which have become deactivated by the deposition of coke and metal contaminants such as nickel, iron, vanadium, etc., are regenerated under conditions which include temperatures in excess of 1300.degree. F. and the periodic use of an amount of oxygen which is in excess of that required to completely burn the coke to CO.sub.2. In a hydrocarbon conversion process whereby a metal-contaminated heavy feed is contacted at conversion conditions with a cracking catalyst to produce lower boiling hydrocarbon products and a spent catalyst having coke and said metal contaminant deposited thereon and wherein said spent catalyst is reactivated in a regeneration zone at elevated temperatures in the presence of O.sub.2 to produce a regenerated catalyst and a flue gas containing more than 2 vol. % CO, the improvement which comprises periodically increasing the amount of O.sub.2 introduced into said regeneration zone at a temperature in excess of 1300.degree. F. so that the level of O.sub.2 is periodically in excess of the amount required to completely burn said deposited coke to CO.sub.2, thereby reducing the poisoning effect of the deposited metals present on the regenerated catalysts.
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Callwood James H.
Ditsler John W.
Exxon Research & Engineering Co.
Konopka P. E.
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