METHOD FOR DETERMINING OCTANE NUMBERS OF MULTICOMPONENT HYDROCARBON MIXTURES Russian patent published in 2023 - IPC G01N33/22 G01N30/00 

FIELD: fuels.

SUBSTANCE: invention relates to methods for research and analysis of fuel, namely the determination of the octane number of motor fuels, and can be used to control the quality of gasoline in oil refining. To implement the method for determining the octane numbers of multicomponent hydrocarbon mixtures, a chromatographic determination of the composition of the hydrocarbon mixture is carried out. Then, the octane number of the mixture is calculated, corrected for imperfection, through the dipole moments of the molecules. At the same time, the octane numbers of individual components are determined based on their dependences on structural descriptors:

for the class of alkanes, for alkenes, cycloalkanes, arenes, where ON is the octane number of the component; a_n (n=0, … , 8) are the dependence coefficients obtained by the least squares method, W is the Wiener index, R is the Randić index, L is the sum of squared eigenvalues of the adjacency matrix. Then the octane number of the mixture is determined by the sum of the octane numbers of the components, taking into account the correction for the imperfection of the mixture.

EFFECT: determining the octane number of multicomponent hydrocarbon mixtures using structural descriptors, as well as the possibility of its application to hydrocarbon mixtures with incomplete information about the octane numbers of the components.

1 cl, 10 tbl, 4 ex