FIELD: petroleum processing. SUBSTANCE: catalytic cracking and hydrocracking feedstock is preliminarily purified to remove polycyclic aromatic hydrocarbons, heteroatom-containing compounds, and heavy metal compounds via liquid extraction of undesired impurities from vacuum gas oil (cracking process feedstock) with two immiscible solvents: polar N-methylpyrrolidone or dimethylacetamide containing 3% water (at 30-50 C) and nonpolar pentane or heptane at weight ratio of nonpolar solvent to feedstock (0.5-1):1. EFFECT: enhanced process efficiency and reduced losses of solvents with extract phase. 3 tbl, 3 ex
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