Novokuibyshevsk refinery vacuum gasoil (VG) with a high sulfur content (2.02 % wt.) thermocracking results are represented in abstract. Its density is 909.8 kg/m3. Material balance and fractional composition of liquid products cracking and reduction of sulfur containing in every component of it was established. Based on experimentally measured parameters we calculated gas, liquid, coke yields depending on process conditions. The amount of hydrocarbons and resins-asphaltens components increased in the vacuum gasoil cracking products, but these products have lower molecular weight in comparison to initial object. Cracking liquid products composition, which were gained after vacuum gasoil benzoyl peroxide (BP) oxidation pretreatment, specific differences from VG thermolysis products with BP used as radical forming addition were established
