METHOD OF ESTIMATING CETANE INDEX OF LIQUID HYDROCARBON FUELS Russian patent published in 2014 - IPC G01N33/22 

FIELD: chemistry.

SUBSTANCE: method includes determination of the density at the fuel temperature 20°C, determination of the averaged boiling temperature T_c, °C, by calculated dependences on temperatures of boiling away of different fuel fractions, setting the density range at 20°C from 700 to 1020 kg/m³, determination of kinematic viscosity at a temperature of 50°C with the fuel density from 860 to 1020 kg/m³ and the temperature of boiling away of final fuel fraction higher than 400°C, equipping a nomogram for CI estimation with an additional scale of viscosity, matched with the T_c scale on the section from 268 to 320°C, setting the Te range from 90°C to 320°C, setting the range of the kinematic viscosity scale from 2.0 to 1000 mm²/s, setting the range of cetane index scale, units, from 0 to 70. The nomogram makes it possible to determine CI of any liquid hydrocarbon fuel (from petrol to the residual one).

EFFECT: extension of assortment of analysed fuels and increased reliability of estimation.

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