Calculation of phase diagrams of heterophase two- and three-component liquid mixtures ‘α-pinene–water’ and ‘α-pinene–water–ethanol’

Phase behaviors of two- and three-component mixtures ‘α-pinene–water’ and ‘α-pinene–ethanol–water’ were studied over a wide range of their composition, temperature, and pressure. Conditions were found that provide heteroazeotropic states of binary mixture ‘α-pinene–water’ and ternary mixture ‘α-pinene–ethanol–water’ depending on the ratio of ‘water/(α-pinene+ethanol)’ fractions at the ‘α-pinene+ethanol’ ratio of 1:1. Critical curves were calculated to demonstrate an anomalous dependence of these curves on the mixture composition, with the temperature minimum points typical of the mixtures that form heteroazeotropes.