Volumetric and viscometric behavior of the binary systems ethyl lactate + 1,2-propanediol, +1,3-propanediol, +tetrahydrofuran and +tetraethylene glycol dimethyl ether. New UNIFAC–VISCO and ASOG–VISCO parameters determination

Abstract

Densities, refractive indices and viscosities of four binary systems consisting of ethyl lactate with 1,2-propanediol or 1,3-propanediol or tetrahydrofuran (THF) or tetraethylene glycol dimethyl ether (TEGDME) were measured at eight temperatures (288.15, 293.15, 298.15, 303.15, 308.15, 313.15, 318.15 and 323.15)K and atmospheric pressure. From these data, excess molar volumes, deviations in refractive indices and viscosity deviations were calculated and fitted to the Redlich–Kister equation. The obtained results have been analyzed in terms of specific molecular interactions between mixture components and the influence of temperature on them. The modeling of VE binary data was performed with the Peng–Robinson–Stryjek–Vera cubic equation of state (PRSV CEOS) coupled with the van der Waals (vdW1) and CEOS/GE mixing rule introduced by Twu, Coon, Bluck and Tilton (TCBT). The refractive indices of binary mixtures were predicted by various mixing rules and compared with experimental data. The viscosity modeling was done by two types of models: predictive UNIFAC–VISCO and ASOG–VISCO and correlative Eyring–UNIQUAC, Eyring–NRTL, Teja–Rice, Grunberg–Nissan and McAlister equations. In addition, due to the high importance of models for viscosity prediction, the experimental data were used to determine the interaction parameters of several functional groups for their application in the UNIFAC–VISCO and ASOG–VISCO models.