Liquid–Liquid Equilibrium of the System {Peanut Biodiesel + Glycerol + Ethanol} at Atmospheric Pressure

Abstract

This study reports experimental data for the liquid–liquid equilibrium (LLE) for a {peanut biodiesel (1) + glycerol (2) + ethanol (3)} system at 303.15 K and 323.15 K at atmospheric pressure. Solubility (binodal) curves were obtained by a cloud-point method. The reliability of the experimental data was confirmed using the Hand and Othmer–Tobias correlations. The regression coefficients were above 0.97 for all data sets. The universal quasichemical model was successfully used to correlate LLE data, which showed root-mean-square deviations of 0.99%, indicating accuracy close to experimental uncertainties.

Liquid–Liquid Equilibrium Measurement and Thermodynamic Modeling of the {Sterculia striata Biodiesel + Glycerol + Ethanol} System

“…The molar mass used for chicha biodiesel (considered as a pseudocomponent) was obtained from the calculation of the weighted average molar mass of the ethyl esters that make up biodiesel, according to studies reported in the literature. 23,24,32,33 The calculations related to the liquid−liquid equilibrium (with estimated parameters) were obtained from the algorithm of Ferrari et al 34 applying the multiphase liquid−liquid flash algorithm with a phase stability test. The ASOG and NRTL models were used to obtain the activity coefficient.…”

“…All analytic and experimental methods used in this work were reported in recent studies. ,,, However, we will briefly present an overview of experimental techniques.…”

“…A magnetic stirrer was used to promote contact between the components inside the cell. Detailed descriptions of the methodologies for obtaining the binodal curves and tie lines were presented in previous studies. , The quality of experimental data was determined according to a method proposed by Marcilla et al, which was successfully applied in previous studies. − …”

“…The molar mass used for chicha biodiesel (considered as a pseudocomponent) was obtained from the calculation of the weighted average molar mass of the ethyl esters that make up biodiesel, according to studies reported in the literature. ,,, …”

“…Temperature changes did not significantly alter the solubility in ternary mixtures, which is in agreement with what was observed in similar systems previously studied. 23,24 The distribution coefficients and the separation factor of the experimental data obtained are listed in Table 5. The separation factor of the system is greater than 1 for all temperatures.…”