A generalized method for estimation of critical constants

Abstract

A generalized and simple method is proposed to estimate critical temperature, pressure and volume of both polar and non-polar compounds. The input parameters are normal boiling point, density and relative molar mass. The proposed procedure was used to estimate critical properties of more than 250 compounds including hydrocarbons (C 1–C 18), acids, sulfur compounds, nitriles, oxide gases, alcohols, halogenated compounds, ethers, amines and water. Average absolute deviations for estimation of critical temperature, pressure and volume for the proposed method are 0.9, 2.8 and 1.8%, respectively.