Establishment of the model for composition prediction of light petroleum fractions and its application

The problem of composition prediction of petroleum fractions was studied. M olecular connectivity index (1) chi was used to describe the molecular stru cture of hydrocarbons. Relationships between some slate parameters of SRK ( Soave-Redlich-Kwong) equation and (1) chi were established. On the basis of these relationships, a theoretical model for predicting the composition of petroleum fractions according to their properties was proposed. Correction al Powell method was used to solve the model. Computational results of five examples indicate that the compositions of main components agree well with the measured data, which prove the feasibility and reliability of the mode l.