Thermoacoustical study of molecular interactions in binary mixtures of pentane with methanol and tert-butanol

Abstract

Experimental values of density, ultrasonic velocity and viscosity for the binary mixtures of pentane with methanol and tert-butanol have been measured at 293.15, 298.15 and 303.15 K over the entire composition range. Using these experimental data, specific heat ratio, heat capacity, effective Debye temperature, pseudo-Grüneisen parameter, viscosity deviation, excess internal pressure, excess Gibb's free energy of activation for viscous flow and excess molar enthalpy have been calculated and computed results were fitted to the Redlich-Kister polynomial equation. These parameters were used to study the nature and extent of intermolecular interaction between components molecules present in the binary mixtures. The results suggest that stronger specific interactions are taking place in pentane + methanol mixture than in pentane + tert-butanol mixture. Furthermore, various empirical relations were used to correlate the ultrasonic velocities of these mixtures. An excellent agreement has been found between experimental and theoretical values.