Ammonia contacting to passivate metals deposited on a cracking c

Details Ammonia contacting to passivate metals deposited on a cracking c Ammonia contacting to passivate metals deposited on a cracking c

1983-08-08

1985-11-05

Konopka, P. E.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208 52CT, 502 50, 502 54, 502521, C10G 1105, C10G 1118, B01J 2938

Patent

active

045512310

ABSTRACT:
Contaminating metals including nickel, vanadium, iron and copper are deposited on a fluid cracking catalyst during the processing of carbo-metallic containing oils such as residual oils, reduced crudes or topped crudes. These contaminating metals lead to undesirous side reactions such as dehydrogenation, coking and methyl group removal which adversely affect conversion and gasoline selectively. Furthermore vanadia deactivates the crystalline zeolite component of the catalyst in addition to causing catalyst agglomeration because of its pentoxide melting point by treatment with a reducing gas such as ammonia. The ammonia is added as 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 of deactivated catalyst by landfill techniques.

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