Process for the demetallization of FCC catalyst
AssigneeChevron Research and Technology Company
InventorsCharles F. Guthrie, Lawrence W. Jossens, James V. Kennedy, John A. Paraskos
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Abstract
A process is disclosed for passivating the reactivity of contaminant metals, such as nickel and vanadium, which have been deposited on a catalytic cracking catalyst, by adding to the cracking catalyst a mixture of a calcium-containing material and a magnesium-containing material in a separate reactor in the presence of steam. The preferred calcium-containing material is dolomite and the preferred magnesium-containing material is sepiolite. It is also preferred to include antimony and/or bismuth compounds in the additive mixture.
Claims18
A process for the removal of vanadium metallic contamination from a vanadium-contaminated FCC particulate catalyst containing crystalline alumina silicate zeolite and metal contaminants in an amount of 2,000 ppm to 10,000 ppm expressed in terms of vanadium based on the weight of the catalyst, comprises the steps of:
- Downloading said contaminated catalyst from an FCC regenerator;
- Charging said downloaded contaminated catalyst to an external reactor containing 10% to 40% by weight based on catalyst of separate distinct additive particles;
- Contacting said cotaminated catalyst and said additive particles in said external reactor under reaction conditions comprising 1200.degree. F.-1400.degree. F. temperature in the presence of steam;
- wherein said additive particles comprise:
- (a) A first component which is a magnesium-containing material comprising a hydrous magnesium silicate;
- (b) A second component which is a calcium-containing material selected from the group consisting of dolomite, calcium magnesium silicate, calcium magnesium oxide, calcium magnesium acetate, calcium magnesium carbonate, and calcium magnesium subcarbonate;
- (c) A binder selected from the group consisting of kaolin, bentonite, montmorillonite, saponite, hectorite, alumina, silica, titania, zirconia, silica-alumina, and combinations thereof;
- wherein the weight ratio of material (a) to material (b) is from about 80:20 to about 20:80 and said binder comprises about 5 to 30% by weight of said additive particle based on the total weight of said additive particle;
- and
- separating an FCC particulate catalyst of reduced vanadium content.
Dependencies are inferred from the claim text.