MARINE HIGH-VISCOSITY FUEL FOR MIDDLE-SPEED AND LOW-SPEED MARINE DIESELS Russian patent published in 1997 - IPC

FIELD: petroleum processing; marine fuels. SUBSTANCE: invention is aimed at solving the problem of giving birth to a universal for middle and low-speed marine diesels high-viscosity fuel with improved performance characteristics, reduced content of sulfur and injurious organic and inorganic impurities, narrow fractional makeup, lowered volatility of light fractions and virtually complete absence thereof, high stability, combustion fullness, and better low- temperature properties, and pumpability. According to first version, fuel contains a narrow straight-run fraction boiling off within temperature range 350-500 C, 94-98 wt %, and thermal cracking residuum with density 1040-1095 kg/cu. m, to 100 wt %. According to second version, fuel contains the same narrow straight-run fraction, 47-95 wt %, and distillate of secondary cracking processes with boiling range 350-500 C, 47-49 wt %, and above-mentioned thermal cracking residuum, to 100 wt %. According to third version, fuel contains two latter components of the second version with contents 94-96 and to 100 wt %, respectively. EFFECT: improved characteristics of fuels appropriate for different types of diesel engines. 4 tbl