VACUUM GAS OIL AND MAZUT PURIFICATION PROCESS Russian patent published in 2006 - IPC C10G21/20 

FIELD: petroleum processing.

SUBSTANCE: invention, in particular, relates to purification of vacuum gas oils, mazuts, and/or dewaxed products used further as feedstock for hydrocracking and catalytic cracking as well as high-quality fuel oils and marine oils. Purification contemplates removal of polycyclic aromatic hydrocarbons, heteroatomic compounds, resins, asphaltenes, and heavy metal compounds. Process consists in liquid extraction of undesired components with two mutually immiscible solvents: polar N-methylpyrrolidone with 3-5% water at 40-60°C and nonpolar n-undecane or undecane fraction forming azeotropic mixtures with N-methylpyrrolidone having minimal boiling temperature (about 179°C). Weight ratio of nonpolar solvent to raw material is (0.4-0.5):1.

EFFECT: increased selectivity of process in reduced risk of thermooxidative and hydrolytic decomposition of N-methylpyrrolidone as well as corrosion of equipment.

1 dwg, 4 tbl, 4 ex