Theoretical prediction of phase behaviour at high temperatures and pressures for non-polar mixtures. Part 4.—Comparison with experimental results for carbon dioxide + n-alkane mixtures

Abstract

The phase diagrams for carbon dioxide + n-alkanes (C₁-C₂₀) have been constructed for the one fluid model using both the van der Waals and Guggenheim equations of state by the techniques described in a previous paper. Various combining rules for calculating the volume and energy parameters characterising interactions between unlike molecules have been used. Comparison between theory and experiment suggest that the interaction parameter ξ is slightly greater than that calculated from the Hudson and McCoubrey combining rule. This is consistent with conclusions reached from an analysis of other thermodynamic properties.