Process for reducing coke formation in heavy feed catalytic crac

Details Process for reducing coke formation in heavy feed catalytic crac Process for reducing coke formation in heavy feed catalytic crac

1981-05-04

1983-02-08

Gantz, Delbert E.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208 52CT, 208 56, 208120, 252411R, 252415, 252464, C10G 916, C10G 1118

Patent

active

043728405

ABSTRACT:
A method for decreasing the amount of coke produced during the cracking of hydrocarbon feedstock to lower molecular weight products in a reaction zone is disclosed, where the feedstock contains at least one metal contaminant selected from the class consisting of nickel, vanadium and iron and where the contaminant becomes deposited on the catalyst such that at least 50 wt. % of the total of the metal contaminants comprises only one of the metal contaminants. The method comprises adding a hydrogen donor material to the reaction zone, monitoring the composition of the metal contaminant on the catalyst, adding an effective passivating amount of at least one of the metal contaminants which is not the major contaminant on the catalyst and passing the catalyst from the reaction zone through a reduction zone maintained at an elevated temperature.

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