Method to passivate metals deposited on a cracking catalyst...

Details Method to passivate metals deposited on a cracking catalyst... Method to passivate metals deposited on a cracking catalyst...

B - Operations, Transporting

01

J

252/1.D

B01J 29/38 (1980.01)

Patent

CA 1185222

A B S T R A C T METHOD TO PASSIVATE METALS DEPOSITED ON A CRACKING CATALYST DURING REDUCED CRUDE PROCESSING Contaminating metals including nickel, vanadium, iron and copper are deposited on a fluid cracking catalyst during the processing of carbo-metallic oils such as reduced crude or topped crude. These contaminating metals lead to undesirous side reactions such as dehydrogenation, coking and methyl clipping which adversely affect conversion and gasoline selectivity. An improved method and process is described for passivating these metals by treatment with a reducing gas such as ammonia. The ammonia is added as gaseous ammonia or in the presence of diluents such as nitrogen, carbon dioxide, flue gas, fuel gas and steam. The reaction of ammonia with vanadium produces vanadium nitride which is water insoluble and facilitates the disposal of high vanadium containing spent catalyst by landfill techniques.

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