The feasibility of intensification of vacuum distillation of high-paraffin residual fuel oil from Kumkol crude oil (Kazakhstan) by controlling phase transitions of oil disperse systems through injection of activating additives into the residual fuel oil is investigated. Addition to residual oil of pyrolysis resin and its fractions, which differ in fractional and hydrocarbon composition, produces extreme changes in vacuum gas oil yield, and substantially contributes to shortening of distillation time. Addition of 1 wt. % of wide a pyrolysis resin fraction to residual fuel oil is highly effective.