RESULTS OF SUBSTANCE GROUPS AND STRUCTURAL GROUPS ANALYSIS OF PETROLEUM FRACTIONS AND THEIR APPLICATION IN ESTIMATING THE CORRELATION FOR PREDICTING PROPERTIES

The investigations are based on measurements of density, refractive index, mean molecular weight, viscosity, surface tension, enthalpie of vaporization and mean boiling point of narrow boiling fractions having boiling points in range of kerosene (between 440 and 540 K). The aim of the work is to develop a model for calculating these properties that does not only take into account the boiling temperature but also the compositions of groups of substance in the corresponding fractions, with the help of the model systematically occuring changes be detected. For comparison the method of calculation of Riazi were considered.