Excess parameters of binary and ternary mixtures of {1-Butanol + hexylamine + n-heptane} at different temperatures and comparison with the Flory theory

摘要

In this work, we calculated(thermal expansion coefficients),(excess thermal expansion coefficients) and(isothermal coefficient of pressure excess molar enthalpy) for the binary and ternary mixtures of {1-butanol +hexylamine+n-heptane} from experimental densities (Djordjevic et al., 2010) at (288.15, 293.15, 298.15, 303.15, 308.15, 313.15, 318.15 and 323.15) K. The trends ofandfor the binary mixture 1-butanol + hexylamine are S-shaped dependence on composition, and for the binary mixture 1-butanol +n-heptane the trends ofandare positive and negative, respectively over the mole fraction rage. For the binary mixture of hexylamine +n-heptane, the trends ofandare negative and S-shaped, respectively. The values ofandof binary mixtures were correlated as a function of the mole fraction by using the Redlich–Kister equation and the ternary mixture was fitted by using the Cibulka equation. By using Flory theory, we calculated the values ofandat different temperature; the results show a good agreement between Flory theory and experimental data.