Chevron U.s.a. Inc.

Chevron Research Company

Lawrence Paul Zestar

Rahul Shankar Bhaduri

Robert A Farnham

Corey A Bertelsen

A method for recovering vanadium from a spent slurry catalyst for hydrocarbon oil hydroprocessing is disclosed. In one embodiment after de-oiling, the spent catalyst is treated with ammonia and air, forming a leach slurry. The leach slurry is subsequently treated with a flocculant. After solid-liquid separation to recover the solid residue containing coke and ammonium metavanadate, the solid residue is washed with an ammonium sulfate solution and leached with hot water. After solid-liquid separation to recover a solution containing ammonium metavanadate, the ammonium metavanadate is crystallized and purified from the leach solution.

Recovery of vanadium from petroleum coke slurry containing solubilized base metals

Superheated steam generated by passing wet steam through a superheater containing a fluidized or partially fluidized bed of hot particulate solids recovered from a retorting process especially useful in a process for recovering hydrocarbon vapors from a hydrocarbonaceous solid such as oil shale.

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Lafayette, CA, United States of America

Lawrence Paul Zestar