Activity Coefficients of the Components of the Binary Systems Consisting of Benzene, Diphenyl, and n-Alkanes

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Theoretical calculations are compared to data from an experimental study of the position of eutectics in two-component systems consisting of benzene, diphenyl, and n-alkanes with 12 to 17 carbon atoms. Data on diphenyl–n-alkane (n = 12–17) and benzene–n-alkane (n = 12–17) systems are given for the composition of eutectics, their melting points, and activity coefficients of each component. The theoretical study is based on the Schroder–Le Chatelier approach and the original UNIFAC system; the experimental study is performed via DTA. Deviations of the experimental data from ones calculated for the studied systems are presented. The change in the activity coefficients of benzene and n-hexadecane is illustrated graphically according to UNIFAC and the experimental data.