FIELD: petroleum processing. SUBSTANCE: process involves viscosity breaking of straight-run petroleum residues followed by atmospheric distillation of viscosity breaking products and recovery of bitumen as residue, straight-run petroleum residues being mazut mixed with heavy gas oil fraction 360-480 C obtained by atmospheric distillation of viscosity breaking vapor products at their ratio 1:(0.5-0.6). Viscosity breaking products are introduced into evaporator at temperature 380-490 C and pressure 0.05-1.5, vapor products are distilled away and then subjected to atmospheric distillation to separate into gasoline and diesel fractions. Evaporator residue distilling above 370 C is discharged as bitumen. EFFECT: extended source of raw materials for production of bitumen with quality meeting requirements for petroleum-origin viscous road bitumens. 1 tbl, 5 ex
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