The Use of the PC-SAFT for Modeling Selected Experimental Thermophysical Properties of Dimethyl Carbonate +1-Butanol Binary Mixture

Selected thermophysical properties (i.e., vapor-liquid equilibrium, liquid mass density, liquid viscosity, and surface tension) for the dimethyl carbonate + 1-butanol binary mixture are measured and modeled over the entire mole fraction range. The vapor-liquid equilibrium (VLE) is measured at 50, 75, and 94 kPa and over 342.9-385.44 K. Liquid mass densities, liquid viscosities, and surface tensions are measured at atmospheric pressure and 298.15 K. The reported measurements are modeled by combining the perturbed chain statistical associating fluid theory equation of state (PC-SAFT EoS) with the free volume theory (FVT) and the linear square gradient theory (LSGT). According to the measurements and modeling, the consistent VLE of the dimethyl carbonate + 1-butanol binary mixture exhibits a positive deviation from Raoult’s law, showing azeotropy behavior at the three explored pressures. For the case of liquid densities, liquid viscosities, and surface tensions, a monotonic dependence on the mole fraction is observed with a negative deviation from the linear behavior. The PC-SAFT EoS shows excellent performance correlating the three isobaric determinations by using only one mixing parameter. Liquid densities are excellently predicted, whereas the behavior of liquid viscosity and surface tensions are well correlated from PC-SAFT EoS with FVT and LSGT, respectively.