Extraction of Molybdenum Compounds from Solid Carbon-Containing Hydroconversion Residue of Heavy Oil Raw Materials

Abstract The results of a study of the extraction of molybdenum compounds introduced into hydroconversion heavy petroleum feedstock as part of a catalyst precursor are presented. A solid phase insoluble in an organic solvent, a Mo-containing concentrate, is isolated from the vacuum hydroconversion residue by filtration. According to X-ray powder diffraction, molybdenum in the concentrate is almost completely contained in the form of MoS2, which is transferred by hydrometallurgical method to the solution of the initial molybdenum precursor. It has been shown that the most effective solvent for isolating molybdenum concentrate from the hydroconversion residue is toluene. When a mixed aqueous solution of nitric and sulfuric acids acts on an isolated concentrate, depending on the ratio of components and solution flow rate (multiplicity) as well as temperature and processing time, a high degree (~99%) of molybdenum compound extraction into the solution is achieved.