Prediction of Molar Volumes of CO2-Expanded Liquids Using a New Generalized Method

Abstract

A new, easy-to-use generalized method is presented in this work for accurate computation of ν L , the molar volume of the carbon dioxide (CO 2 )-expanded liquids. This method calculates the liquid-phase compressibility factor, Z L , of the binary mixture of CO 2 and solvent. The uniqueness of this method is that it does not involve computation to solve a cubic equation, nor does it require any binary interaction constants and critical temperatures of the pure components, as in the case of the equation of state (EOS) method. Z L is obtained directly from a generalized correlation in terms of the pseudo-reduced pressure (P r ) with two system-specific constants. These two constants are simply dependent on the acentric factor of the solvent, ω 2 . The computation of υ L by this method has been validated for 17 CΟ 2 -solvent systems at temperatures in the range of 290.8-328.2 K and at pressures in the range of 4-96 bar with the experimental data available in the literature.