Volumetric and Solid + Liquid Equilibrium Data for Linear 1-Alkanol + Decylamine Mixtures. Analysis in Terms of ERAS, DISQUAC, and Modified UNIFAC

Solid + liquid phase diagrams have been determined for 1-octanol, 1-nonanol, 1-decanol, or 1-undecanol + decylamine mixtures. Solid addition compounds form with the empirical formulas: C 8 H 17 OH·C 10 H 23 N, C 9 H 19 OH·C 10 H 23 N, C 10 H 21 OH·C 10 H 23 N, and C 11 H 23 OH·C 10 H 23 N. All are congruently melting compounds. Compound formation is attributed to a strong A−B interaction. The excess molar volumes,, have been determined for these mixtures at 298.15 K and atmospheric pressure. The systems exhibit very large negative excess molar volumes,, and excess molar enthalpies, . The curves are nearly symmetrical. Strong cross-association between hydroxyl and amine groups (OH···NH 2 ) is a dominant effect, and it causes high negative values of and and 1:1 congruently melting solid compounds at lower temperatures. Our experimental data on and the literature data on were treated in terms of the ERAS model, DISQUAC, and modified UNIFAC. The ERAS model consistently describes and of the studied mixtures.