Abstract: The features of vacuum residue from PetroChina Urumqi Petrochemical Company were characterized by high carbon residue, low fluidity and easy coking. A new residue oil additive made from butyl methacrylate (BMA), styrene and maleic anhydride through solution polymerization with benzoyl peroxide as an initiator was added into the residue to investigate the effect on the changes of CCR, fluidity, SARA composition and the coking reaction. The results show that residual oil additive can reduce carbon residue, improve low temperature fluidity and the stability of colloid system of residue oil. Comparing with the blank residue, the conversion rate of residual oil with additive increases by 7.7 percent points, the coking yield decreases by 2.60 percent points. The liquid yield increases 2.06 percent points, among which the yield of gasoline increases by 25.4 percent points, while diesel oil and wax oil decreases by 17.7 percent points and 7.7 percent points, respectively.

Key words: residue, additive, carbon residue, coking reaction