Demetallization process for a conversion catalyst

Details Demetallization process for a conversion catalyst Demetallization process for a conversion catalyst

1979-10-04

1981-05-12

Konopka, P. E.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208120, 252411R, 252411S, 252412, 252413, 252416, 252420, C10G 1100, C10G 1105, B01J 2120, B01J 2938

Patent

active

042670322

ABSTRACT:
Disclosed is an aqueous phase oxidation for removing at least a portion of metal contaminants such as nickel, vanadium, iron or copper from a catalyst used in a hydrocarbon conversion process. The aqueous phase oxidation comprises: contacting a sulfided metals contaminated catalyst with an aqueous solution comprising soluble metal nitrate ions and a catalytically effective concentration of nitrite ions. Optionally, the sulfided catalyst which has been oxidized can be further treated with an aqueous oxidative and/or reductive wash. The oxidative wash preferably follows the reductive wash for optimal results.

REFERENCES:
patent: 2704281 (1955-03-01), Appell
patent: 3147228 (1964-09-01), Erickson
patent: 3148155 (1964-09-01), Schwartz
patent: 3173882 (1965-03-01), Anderson
patent: 3324044 (1967-06-01), Oberhofer
patent: 3923689 (1975-12-01), Broughton et al.

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