No abstract

Based on molecular theory of hard-core model. The parameters of the ne In this study, an equation of state is derived w cubic equation of state are temperature and acentric factor dependent. To calculate the saturate vapor pressure and volume of vapor and liquid of pure compound, this equation of state requires the critical temperature, the critical pressure and acentric factor of the compound. The proposed equation of state is applied for the calculation of PVT and VLE of various pure fluids and fluid mixtures. The average of absolute deviations of the predicted vapor pressure, vapor volume and saturated liquid density of 30 pure compounds are 0.814, 2.614 and 5.814%, respectively. The results are compared with those obtained by commonly used cubic equations of state. In addition comparisons with the mentioned cubic equations of state to predict some of the thermodynamic properties, including second virial coefficients and thermal properties, are given. The results indicate that the new equation of state yields better results. Moreover, the capability of the equation of state to predict the molar heat capacity of gases at constant pressure and volume, the sound velocity in gases, and the zero line fpr gases are also illustrated.