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

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.