Connectivity of critical lines around the van Laar point in T, X projections

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Abstract
It is shown that the SPHCT equation of state describes qualitatively the same types of binary phase behavior around the van Laar point as the van der Waals and the Redlich–Kwong equation of state. A continuous transition is possible from a binary system with a van Laar point into binary systems that show type II, III, IV and IV* phase behavior. The global phase diagram turns out to be a helpful tool in the exploration of these different types of phase behavior. Special attention is paid to the link between moving across the global phase diagram and the resulting changes in the phase behavior of the corresponding binary mixtures. We will focus on the temperature‐composition behavior of the critical lines in the binary mixtures. This temperature‐composition behavior is very important if one wants to make an experimental verification of the van Laar point or type IV* phase behavior.