Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1983-09-02
1985-01-22
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 55, 423 58, 423 61, 423 63, 423 65, 423 68, 423138, C01G 3100, C01G 3900
Patent
active
044951574
ABSTRACT:
A process is provided for recovering metal values from spent hydrodesulfurization catalyst, the process comprising forming in a pressure reactor an aqueous slurry of finely divided spent catalyst and sodium carbonate, the spent catalyst containing by weight about 2 to 10% Mo, up to about 12% V (e.g., about 2 to 10%), about 0.5 to 4% Co, up to about 10% Ni (e.g., about 0.5 to 5%), occluded oil, coke, sulfide sulfur and the balance essentially alumina. The amount of sodium carbonate employed is at least sufficient under oxidizing conditions to convert molybdenum and any vanadium present to soluble Na.sub.2 MoO.sub.4 and NaVO.sub.3 and to neutralize SO.sub.3 produced during oxidation, the amount of sodium carbonate being at least that required stoichiometrically. The slurry is heated to a temperature of about 200.degree. C. to 350.degree. C. (e.g., 275.degree. C. to 325.degree. C.) and a pressure of about 800 psig to 2500 psig (e.g., about 1500 psig to 2500 psig) for a time at least sufficient to solubilize the molybdenum and vanadium present, the amount of oxygen employed being over about 1.1 times the stoichiometric amount sufficient to oxidize the metal values and sulfur to the maximum oxidized state, and to oxidize the oil and free carbon to CO.sub.2 and H.sub.2 O. The solubilized Mo and V are thereafter separated from each other.
REFERENCES:
patent: 2187750 (1940-01-01), Marvin
patent: 3773890 (1973-11-01), Fox et al.
patent: 4075277 (1978-02-01), Castagna et al.
patent: 4075278 (1978-02-01), Gravey et al.
patent: 4087510 (1978-05-01), Steenken
patent: 4145397 (1979-03-01), Tioda et al.
patent: 4382068 (1983-05-01), Rokukawa
Laferty John M.
LaValle Pablo P.
May William A.
Sebenik Roger F.
Amax Inc.
Carter Herbert T.
Ciomek Michael A.
Kalil Eugene J.
LandOfFree
Recovery of metal values from spent hydrodesulfurization catalys does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Recovery of metal values from spent hydrodesulfurization catalys, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recovery of metal values from spent hydrodesulfurization catalys will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-566418