Measurements and Correlation of Isobaric Vapor–Liquid Equilibria and the Isothermal Surface Tension of the Methyl Butyrate + Dibutyl Ether Binary Mixture

Abstract

Vapor–liquid equilibria (VLE) and surface tensions (ST) for the methyl butyrate + dibutyl ether binary mixture have been measured in the whole mole fraction range. Specifically, VLE determinations are carried out in a Guillespie-type VLE cell at three isobaric conditions, namely 50.00, 75.00, and 94.00 kPa, and over the temperature range from 352 to 410 K. The reliability of the reported VLE data is verified using the modified versions of the Herington’s and the Van Ness et al. consistency thermodynamic tests. Based on the VLE experimental results, this binary mixture displays a positive deviation from Raoult’s law over the explored pressure range, and no azeotropy is detected. Complementarily, the VLE data are well-correlated by selected classical activity coefficients models (e.g., Porter, Margules, NRTL, and Wilson) for all explored isobaric conditions, where the Porter activity coefficients model displays the lower deviations. In contrast, ST measurements were carried out in a maximum differential bubble pressure at 298.15 K and 101.33 kPa. According to the experimental results, ST displays a negative deviation from the linear behavior at the experimental isothermal and isobaric conditions, and ST increases as the methyl butyrate liquid mole fraction increases. The ST measurements are satisfactorily correlated by the Myers–Scott equation using two parameters.