The classification of ternary vapor‐liquid equilibrium (VLE) diagrams is a key to simple azeotropic distillation analysis. All ternary mixtures reported so far to be occurring in nature can be qualitatively represented by a combination of only four elementary cells. This greatly reduces the number of VLE diagram structures that need to be analyzed in order to reveal the qualitative characteristics of any ternary azeotropic mixture.
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Hilmen et al. (2002) studied this question.
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