Dahlhoff, G, Andreas Pfennig, Hammer, H, van Oorschot, M:
Vapor-liquid equilibria in quaternary mixtures of dimethyl ether plus n-butane plus ethanol plus water
J. Chem. Eng. Data, 2000, 45(5), 887 - 892
The vapor-liquid equilibria, liquid densities, and liquid-liquid phase separation of the quaternary system dimethyl ether (DME) + n-butane + ethanol + water were determined at 293.15 K. The vapor-liquid equilibria were measured for mixtures with 0-70 wt % dimethyl ether, 0-40 wt % n-butane, 0-70 wt % ethanol, and 0-35 wt % water, depending on the presence of a second liquid phase. The experiments were carried out in a static vapor pressure apparatus. The UNIQUAC model was used to perform the necessary corrections of the measured vapor-liquid equilibrium data. On the basis of the Gibbs-Duhem equation and experimental data, a set of parameters for this model was calculated. Using the parameters in the UNIQUAC model, it was possible to describe the quaternary as well as some of the ternary and all six binary subsystems.