Experimental (Solid + Liquid) and (Liquid + Liquid) Equilibria and Excess Molar Volume of Alkanol + Acetonitrile, Propanenitrile, and Butanenitrile Mixtures

Abstract

Solid + liquid) and (liquid + liquid) phase diagrams have been determined for (1-octanol, 1-nonanol, 1-decanol, or 1-undecanol + acetonitrile, propanenitrile, or butanenitrile) mixtures. Only mixtures with acetonitrile show immiscibility in the liquid phase with an upper critical solution temperature. The excess molar volumes (V m E ) have been determined for a 1-alkanol (1-octanol, 1-nonanol, 1-decanol, or 1-undecanol + propanenitrile) and (1-undecanol + butanenitrile) at 298.15 K and atmospheric pressure. For all the mixtures investigated in this work, the V m E is small and positive. Mixtures were investigated in terms of the modified UNIFAC (MU) model using the interaction parameters cited in the literature. The model describes in the correct range of temperature and composition the liquidus curves, critical points, and excess molar enthalpies. The Extended Real Associated Solution (ERAS) and Flory-Benson-Treszczanowicz (FBT) models were also used to represent the V m E data and to predict excess molar enthalpies of the investigated systems. Excess molar volumes and enthalpies (literature data) are wellrepresented by the ERAS model. The ERAS model gives the better prediction than that of the MU model for excess molar enthalpies. The calculated curves using ERAS are closer to the experimental points except in the region of low concentration in alcohol. This means that, in terms of ERAS, the contribution to the excess molar enthalpy from the self-association of the alcohol is overestimated. The MU model underestimates the excess molar enthalpy. The FBT model cannot be used to predict these data as the interaction of the unlike molecules is not described in this model.

Experimental (solid+liquid) phase equilibria of (alkan-1-ol+benzonitrile), (amine+benzonitrile) binary mixtures, and (decan-1-ol+decylamine+benzonitrile) ternary mixtures

“…This paper is a continuation of our systematic study on the interactions between unlike molecules in systems of polar compounds, such as alkan-1-ols with amines [1][2][3][4], mixtures of alkan-1-ols with nitriles [5] and amines with nitriles [6]. Mixtures of (alkan-1-ol, or amine + nitrile) are known from the heats of mixing and excess molar volumes to show weaker interactions, than that observed in (alkan-1-ol + amine), especially for the short chain alcohols, or amines (see Refs.…”

“…Mixtures of (alkan-1-ol, or amine + nitrile) are known from the heats of mixing and excess molar volumes to show weaker interactions, than that observed in (alkan-1-ol + amine), especially for the short chain alcohols, or amines (see Refs. [1][2][3][4][5] and the literature cited in). Solid-liquid equilibria data (SLE), liquid-liquid equilibria data (LLE), molar excess volume data, V E m and molar excess enthalpies data, H E m for these systems are * Corresponding author.…”

“…Solid-liquid equilibria data (SLE), liquid-liquid equilibria data (LLE), molar excess volume data, V E m and molar excess enthalpies data, H E m for these systems are * Corresponding author. known from the literature [1][2][3][4][5]. The molar excess volumes, V E m [7][8][9][10][11][12][13][14][15][16][17] and molar excess enthalpies, H E m [18,19] for (alkan-1-ol + acetonitrile) systems were presented previously.…”

“…The choose of substances was dictated by the method of measurements (melting temperatures possible to observed). Additionally, the same solvents were used as in our previous work [1][2][3][4][5][6].…”

“…To close our fundamental discussion about the interactions in these polar systems [1][2][3][4][5][6], SLE for the ternary system (decan-1-ol + decylamine + benzonitrile) have been determined at three temperatures 273.15, 278.15 and 283.15 K using the same cryometric dynamic method at atmospheric pressure.…”