METHOD OF DETERMINING OCTANE NUMBER OF MOTOR GASOLINES FREE OF ANTIKNOCK ADDITIVES, REFORMING CATALYSATES, AND STRAIGHT-RUN GASOLINE FRACTIONS Russian patent published in 2005 - IPC

FIELD: petroleum product investigation methods.

SUBSTANCE: invention relates to methods of investigations and analyses of fuels using standard laboratory equipment and suitable for in-line control of petroleum products' quality. Method of invention comprises determining octane number of reference samples according to research and motor methods, plotting calibration dependence of information parameters on octane number, and subsequent identification of octane number of test sample from this dependence. Information parameters utilized are (i) aromaticity index of tested product represented by proportion of area of a group of peaks for aromatic compounds on express chromatogram of product and (ii)density of product at 20ºC. Octane number of test sample (ON) is calculated from following dependence: ON = ON'+Kn(KaA+675-ρ₂₀), where ON', K_n, and K_a are calibration parameters, A aromaticity index, %, and ρ₂₀ density of sample at 20°C, kg/m³.

EFFECT: simplified and accelerated octane number determination.

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