Abstract
Prospects of improving refining with simultaneous extraction of metal impurities (vanadium, nickel). The analysis of the different ways demetallisation. To remove metals from used oil extraction-settling, adsorption and adsorption-catalytic, hydrogenation, thermal, chemical and other nontraditional ways. The structure of the porphyrin metal complexes in the oil. The most promising method for the isolation of metalloporphyrins of oil is a selective extraction of polar solvents. Developed methods for the removal of metals using magnetic properties. On a number of refineries used a catalytic hydrotreating catalysts for three-phase reactor. The main directions of further work on demetallisation oil.