| dc.description.abstract | This paper reports the density, refraction index, and (vapor + liquid) equilibria (VLE) for binary systems
{aldehyde + 1-ethyl-3-methylimidazolium ethylsulfate ([emim][EtSO4])}: {propionaldehyde + [emim]-
[EtSO4]} and {valeraldehyde + [emim][EtSO4]}. The uncertainties for the temperature, pressure, and
compositions measurements for the phase equilibria are ±0.1 K, ±0.01 kPa and ±0.0004, respectively. A
qualitative analysis of the variation of the properties with changes in solvent and temperature was per-
formed. The Peng–Robinson equation of state (PR EoS), coupled with the Wong–Sandler mixing rule
(WS), is used to describe the experimental data. To calculate activity coefficients we used three different
models: NRTL, UNIQUAC, and COSMO-SAC. Since the predictive liquid activity coefficient model
COSMO-SAC is used in the Wong–Sandler mixing rule, the resulting thermodynamic model is a completely
predictive one. The prediction results for the density and for the (vapor + liquid) equilibria have a deviation
lower than 2.3% and 1.6%, respectively. The (vapor + liquid) equilibria predictions show a good description
for the propionaldehyde system and only a qualitative description for the valeraldehyde system. | |
