A developed equation for predicting the vapor pressure of C-H-O hydrocarbons

Prediction of the available vapor pressure data in the case of C-H-O hydrocarbons led to derivation and recommendation of standard equations for this property. The accuracy of vapor pressure estimations is essential because it is used as a basis to calculate the acentric factor and the thermal and equilibrium properties. In this study, an accurately developed equation for calculation of vapor pressure is presented for 213 pure C-H-O hydrocarbons as a function of reduced temperature and critical pressure. With this equation, vapor pressures have been calculated and compared with the experimental data reported in the literatures for 213 pure hydrocarbons for more than 3800 data points, and the overall average absolute percentage deviation is only 0.286%. The accuracy of the developed equation has been compared to Antoine, Wagner, and other most used equations, and the comparison indicates that the developed method provides more accurate results than other methods used in this work.