Measurement and Thermodynamic Modeling of Ternary (Liquid + Liquid) Equilibrium for Extraction of 2-Methyl-3-buten-2-ol from Aqueous Solution with Different Solvents

Abstract

Liquid−liquid equilibrium (LLE) data for water + 2-methyl-3-buten-2-ol + (isopropyl ether or 4-methylpentan-2-ol or p-xylene or ethyl acetate) ternary systems was measured at 308.2 K under 101.3 kPa. Distribution coefficients and separation factors were obtained and applied to evaluate the extraction capacity of selected solvents. Furthermore, the experimental LLE data were successfully correlated by the nonrandom two-liquid (NRTL) and universal quasi-chemical (UNIQUAC) models, which showed a root-mean-square deviation (RMSD) of less than 0.78% for all systems.

Experimental Study and Thermodynamic Modeling of Ternary Liquid–Liquid Equilibrium of Water + 2,2,2-Trifluoroethanol + Four Solvents at 298.2 K

“…Experimental equipment and detailed methods are also described in previously published papers. − The experiment of water + TFE + {MIBC or MIBK or MIPK or benzyl alcohol} was carried out at 298.2 K. During the entire experimental measurement process, under the condition that precise control of the temperature fluctuation range is less than 0.1 K, the water, the extractant and trifluoroethanol mixture was added to the equilibrium kettle, thoroughly agitated for 4 h, and allowed to equilibrate for 8 h. The organic phase and the lower aqueous layer were sampled for chromatographic analysis.…”

Thermodynamic Modeling of Liquid-Liquid Equilibrium in Ternary Systems with Biodiesel and Isolated Ester (Methyl Palmitate)

“…This behavior demonstrates that most of the methanol is concentrated in the glycerol-rich phase, as confirmed by the tie lines in the LLE diagrams in Figure 2. However, selectivity values indicate a biodiesel-rich contamination phase and an increase in methyl ester concentration in the glycerol-rich phase due to excess methanol [44,45]. This means that the cost of biodiesel purification rises owing to the higher amount of excess methanol and its effect on glycerol and biodiesel or MP distribution between the two phases.…”