FIELD: petrochemical processes. SUBSTANCE: oil distillate fractions are subjected to hydrofining in presence of catalysts containing molybdenum, nickel (cobalt), and aluminum oxides at elevated temperature and pressure, catalysts being periodically subjected to sulfidizing. According to invention, starting material is preliminarily treated with ozone-air mixture at 5-40 C and atmospheric pressure. EFFECT: improved environmental characteristics of fuel. 3 tbl, 2 ex
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