Excess thermodynamic parameters for binary and ternary mixtures of {1-butanol (1) + cyclohexylamine (2) + n-heptane (3)} at different temperatures: A theoretical study

Abstract

In this work, we used the experimental data of Kijevcanin et al. for determining the excess thermodynamic parameters such as excess thermal expansion coefficients αE, isothermal coefficient of pressure excess molar enthalpy (∂HmE/∂P)T and excess partial molar volumes V¯m,iE for the binary and ternary mixtures formed by {1-butanol+cyclohexylamine+n-heptanes} at (288.15–323.15) K. The αE values, for 1-butanol+cyclohexylamine are S-shaped and for 1-butanol+n-heptane are positive and for cyclohexylamine+n-heptane are negative over the mole fraction range. The (∂HmE/∂P)T values, for 1-butanol+cyclohexylamine are S-shaped and for binary mixture of 1-butanol+n-heptane are negative and for binary mixture of cyclohexylamine+n-heptane are positive over the mole fraction. The values of αE and (∂HmE/∂P)T are calculated by using the Flory theory, the results show a good agreement with experimental data. The values of αE and (∂HmE/∂P)T for ternary mixture {1-butanol+cyclohexylamine+n-heptanes} are determined and the experimental data are correlated as a function of the mole fraction by using the equations of Cibulka, Jasinski and Malanowski, Singe et al., Pintos et al., Calvo et al., Kohler, and Jacob–Fitzner. The results show that the Calvo et al. equation is better than others.