Vapor-Liquid Equilibria and Interfacial Tensions of the System Ethanol+2-Methoxy-2-methylbutane

Isobaric vapor liquid equilibrium (VLE) data have been measured for the binary system ethanol + 2-methoxy-2methylbutane at (50, 75, and 94 kPa) and over the temperature range (334 to 356) K. Equilibrium determinations were performed in a VLE still with circulation of both phases. The dependence of interfacial tensions of this mixture on concentration was also determined at atmospheric pressure and 303.15 K, using the maximum differential bubble pressure technique. According to experimental results, the mixture exhibits a positive deviation and a minimum boiling point azeotrope for which the mole fraction impoverishes in ethanol as pressure (or temperature) increases. In addition, the determined interfacial tensions exhibit a negative deviation from the linear behavior. The VLE data of the binary mixture satisfy the Fredenlund's consistency test and were wellcorrelated by the Wohl, nonrandom two-liquid (NRTL), Wilson, and universal quasichemical (UNIQUAC) equations for all of the measured isobars. Interfacial tensions, in turn, were satisfactorily correlated using the Redlich-Kister equation.