Abstract
This study aims at an extension of our concept of physical property estimations of hydrocarbon mixtures to boiling point estimation for hetero compounds such as phenols, pyridines, carbazoles and thiophenes in heavy oils. The estimation takes into account that the boiling points of the hetero compounds with the characteristic functional groups such as hydroxy and amino groups are higher than the reference hydrocarbon having the same molecular weight and skeleton structure and further that the boiling points of hetero compounds gradually approach to those of reference hydrocarbons with an increase in molecular weight. Plots of the ratio of the boiling point of a hetero compound to that of its reference hydrocarbon against the reciprocal of the carbon number gave approximately straight lines, which intersect the ordinate of 1. The slopes varied with the number of aromatic rings, and the type of rings such as furan, pyrole and thiophene. Based on the above findings, an equation was established by regression analysis for calculating boiling point of hetero compounds. Thus, the calculated boiling points of hetero compounds are in good agreement with those observed.
