Excess properties and vapour pressure of (3-diethylaminopropylamine + n-alkanes)

Abstract

The vapour pressures of liquid (3-diethylaminopropylamine (3-DEPA) + n-heptane) mixtures were measured by a static method between T = (303.15 and 343.15) K at 10 K intervals. The molar excess enthalpies H E at T = 303.15 K were measured for the systems {3-DEPA + C n H 2 n+2 ( n = 6, 7, 12)}. The molar excess Gibbs free energies G E were obtained with Barker’s method and fitted to the Redlich–Kister equation. The Wilson equation was also used. Deviations between experimental and predicted G E and H E, by using group contribution UNIFAC (Gmehling version) model, were evaluated.