Excess volume, excess enthalpy and vapour–liquid equilibria of N, N, N′, N′-tetramethyl-1,3-butanediamine + n-heptane or + cyclohexane mixtures

Abstract

Experimental data are reported of excess molar volumes and excess molar enthalpies of binary mixtures of N, N, N′, N′-tetramethyl-1,3-butanediamine + n-heptane or + cyclohexane at 298.15 K. The vapour pressures of the same binaries were also measured by a static method between 273.15 and 363.15 K at 10 K intervals. The molar excess Gibbs energies, calculated from the vapour liquid equilibrium data, and the molar excess enthalpies are used to test the applicability of group-contribution (DISQUAC) model. In particular, the possibility is tested to analyse the intramolecular effects (proximity effect).