Calculating the vapor pressure of aliphatic hydrocarbons by additive methods and determining their critical parameters on this basis

Abstract

A method based on additive estimates of the coefficients in the Riedel equation describing the temperature dependence of the vapor pressures of compounds within broad ranges of temperature is proposed for calculating the saturated vapor pressures of organic compounds. The numerical values of additive parameters for calculating the vapor pressures of aliphatic hydrocarbons of different classes are obtained. An algorithm for estimating the critical temperatures, critical pressures, and Riedel coefficients at a critical point on the basis of a set of saturated vapor pressures of compounds at different temperatures is developed.