Interfacial Tensions in Carbon Dioxide + Hydrocarbon Systems: Experimental Data and Correlations

Abstract

Interfacial tensions (IFTs), equilibrium phase compositions, and phase densities have been measured for the co2 + n-tetradecane system at 160�F and pressures from approximately 1000 psia to the critical point. The experimental data were smoothed using a multi-parameter function. The experimental data for the co2 + n-tetradecane plus four previously available binary systems containing co2 (Co2 + n-butane, ndecane, benzene, and cyclohexane) were used to evaluate the frameworks and predictive capabilities of several IFT correlations. The WeinaugKatz and Lee-Chien IFT correlations were evaluated by optimizing the parachors and critical exponent from regressions of the experimental data. The Hugill-Van Welsenes IFT correlation was evaluated in a similar manner except an additional parameter (binary interaction parameter) was determined for each binary system. Several parachor correlations were evaluated including: (1) Lee-Chien, (2) Hugill-Van Welsenes, and (3) a parachor correlation developed during this work.