Application of multiparameter fundamental equations of state to predict the thermodynamic properties and phase equilibria of technological oil fractions

The results of comparison with the experimental data on density, isobaric heat capacity, enthalpy and entropy of vaporization are presented. The comparison was performed over a temperature range 300-630 K and pressures up to 60 MPa excluding the critical region. The average absolute deviations of the properties from optimized values are the following: 0.17% for the liquid-phase density; 3.5% for the gas-phase density; 2.2% for the density in the supercritical region. The average absolute deviation of isobaric heat capacity for the liquid phase is 1.5-3.5%, for the gas phase is 2.5%, in the supercritical region is 2.1%. The average absolute deviations of the vaporization enthalpy and entropy are 1.65% and 2.23%, correspondingly.