Catalyst demetallization with a reductive SO.sub.2 wash

Details Catalyst demetallization with a reductive SO.sub.2 wash Catalyst demetallization with a reductive SO.sub.2 wash

1976-06-14

1981-01-06

Konopka, P. E.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

208113, 208120, 252411S, 252413, 252416, 423 68, 423150, B01J 2120, B01J 2938, C10G 1104, C10G 1100

Patent

active

042435501

ABSTRACT:
A process for the removal of metal poisons such as nickel, iron and/or vanadium from a hydrocarbon conversion catalyst which includes the step of contacting the catalyst with a reductive wash medium comprising an aqueous, preferably saturated, solution of SO.sub.2 to remove at least a portion of the metal poisons. The vanadium and nickel metals may be recovered from the resultant used wash solution for possible metallurgical use. The SO.sub.2 reductively washed catalyst may also be subjected to a subsequent oxidative wash such as hydrogen peroxide wash prior to its return to the hydrocarbon conversion process.

REFERENCES:
patent: 3147228 (1964-09-01), Erickson
patent: 3148155 (1964-09-01), Schwartz
patent: 3150103 (1964-09-01), Anderson
patent: 3168481 (1965-02-01), Erickson
patent: 3234145 (1966-02-01), Foster
patent: 3236761 (1966-02-01), Rabo et al.
patent: 3255102 (1966-06-01), Sanford et al.
patent: 3562150 (1971-02-01), Hamilton et al.

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