Experimental Determination of Selected Thermophysical Properties of the 2-Methylfuran + Ethanol Binary Mixture

Vapor–liquid equilibrium (VLE), liquid mass density, liquid dynamic viscosity, and surface tension have been measured over the entire mole fraction range for a new potential biofuel formed by a 2-methylfuran + ethanol binary mixture. The VLEs are measured at 50.01, 75.01, and 94.01 kPa, and over a temperature range of 313 to 350 K. The other mixture properties have been measured at 298.15 K and 101.33 kPa. According to the VLE results, this binary mixture displays a minimum-boiling azeotropy under the explored conditions, and the data are well-correlated by classical activity coefficient models, with the Wilson model showing lower deviations. The liquid mass density increases with the mole fraction of 2-methylfuran, and the sign of the excess volumes changes from negative to positive as the concentration of 2-methylfuran increases. This behavior is correlated to two parameters of the Redlich–Kister expansion. The liquid dynamic viscosity decreases as the mole fraction of 2-methylfuran increases, and this relationship is correlated by two parameters using the Redlich–Kister expansion. The surface tension exhibits unusual behavior, where it increases as the mixture becomes more volatile, showing a positive deviation from linear behavior. The surface tension determinations are well-correlated using the four-parameter Myers–Scott polynomial.