METHOD OF PRODUCING WINTER DIESEL FUEL Russian patent published in 1999 - IPC

FIELD: petroleum processing; liquid fuel production. SUBSTANCE: invention relates to diesel fuels produced from straight-run oil distillation products and secondary products. Crude oil is distilled to isolate kerosene fraction with boiling range from 120 to 240-270 C and diesel fractions boiling off within the ranges from 140 to 300-330 and from 210 to 350-370 C. Straight-run distillation residue is transferred into vacuum column to isolate vacuum gas oil (330-350 to 470-510 C), which is subjected to catalytic cracking to yield light catalytic cracking gas oil (140-160 to 360-370 C). The latter is compounded with diesel fractions at ratios from 10:20:70 to 20: 60: 20. Resultant compound is subjected to hydrofining. Straight-run gasoline is subjected to additional rectification to isolate residual tail fraction 170-270 C. Hydrogenate is compounded with kerosene, gasoline distillation residue, and straight-run diesel fractions to form mixture containing, wt %: hydrofined distillate, 60-80; kerosene fraction 120-(240-270) C, 5-20; gasoline distillation tail fraction 170-270 C, 5-10; and straight-run fraction mixture component, 140-(330-370) C, the balance. Resultant base fuel is supplemented by 0.1:25 ethylene-vinylacetate copolymer depressant with molecular weight up to 80•10⁴ in concentration from 0.01 to 0.5%. Depressant is applied in the form of 3-80% solution in oil fraction 140-370 C. EFFECT: increased yield and improved working characteristics of diesel fuel. 2 cl, 3 tbl