Passivation of cracking catalysts

Details Passivation of cracking catalysts Passivation of cracking catalysts

1979-12-31

1981-07-28

Gantz, Delbert E.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

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

Patent

active

042808960

ABSTRACT:
A method for passivating a catalyst used to crack 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 a major portion of the total of said metal contaminant deposited on the catalyst comprises only one of the metal contaminants. The method comprises monitoring the composition of said metal contaminant on the catalyst, adding a predetermined amount of at least one of said metal contaminants not present as the major contaminant on the catalyst, and passing the catalyst from the reaction zone through a reduction zone maintained at an elevated temperature for a time sufficient to at least partially passivate said metal contaminant.

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Cimbalo et al., "Deposited Metals Poison FCC Catalyst," Oil Gas Journal, pp. 112, 114, 118, 120, 122 (May 15, 1972).

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