Abstract: The effect of hydrotreating on the catalytic cracking performance of the mixed oil of Russian vacuum residue and VGO with high sulfur, nitrogen, metal content and high residual carbon value was investigated. The results showed that compared with non-hydrotreated feedstock, when the hydrotreated residue was over 350 °C, the total liquid yield of the product and the gasoline yield were increased by 4.41 percentage points and 5.74 percentage points, respectively, the light oil yield was increased by 5.12 percentage points, and the coke yield was decreased by 3.40 percentage points; the sulfur content of FCC gasoline was decreased from 660 μg/g to 53 μg/g, the mass fraction of olefins was decreased from 40.8% to 36.9%, the octane number of the research method was increased by 0.69. The properties of FCC gasoline were significantly improved.

Key words: Russian residue, fluid catalytic cracking, residue hydrogenatio