EXCESS-ENTHALPIES FOR 1,1,1-TRICHLOROETHANE WITH ALKANES, KETONES, AND ESTERS

Excess enthalpies provide quantitative information about the temperature dependence of the excess Gibbs energy G(E). This information should therefore be used together with other results (vapor-liquid equilibria, liquid-liquid equilibria, limiting activity coefficients, and azeotropic data) for fitting simultaneously temperature-dependent G(E) model parameters or interaction parameters of group contribution methods. Although a large number of H(E) measurements have been published, results at temperatures other than 298.15 K are scarce. In this paper a flow calorimeter is described, and excess enthalpy data are given for the test systems n-hexane + cyclohexane, benzene + cyclohexane, and methanol + water at 298.15 K as well as for 1,1,1-trichloroethane + n-pentane, + n-heptane, + acetone, + 2-butanone, + methyl acetate, and + ethyl acetate at 363.15 K. The results were used for the systematic development of the group contribution method (modified UNIFAC) developed at Dortmund.