Experiments and COSMO-SAC Modeling of Methyl Isobutyl Ketone + Dimethylphenols + Water Mixtures

Abstract

Methyl isobutyl ketone (MIBK) had been successfully employed to extract phenols from coal gasification wastewater since 2009, and it has been proved to be an excellent extraction solvent. In this work, the liquid−liquid equilibrium (LLE) data were measured for the ternary systems MIBK + 2,3-/3,4-/3,5dimethylphenol + water from 298.15 to 343.15 K. High partition coefficient and separation factor indicated that MIBK could extract dimethylphenols from an aqueous solution well. The Hand equation and the Bachman equation were used for testing the consistency of the determined tie-line data. The NRTL and UNIQUAC thermodynamic models were utilized to correlate these measured LLE data, and their root-mean-square deviations did not exceed 0.5%. The conductor-like screening model for segment activity coefficient was employed to predict the LLE data. Results showed that the prediction values are close to the measured data.

Measurement and Thermodynamic Modeling of Liquid–Liquid Equilibrium Data for Ternary Systems (Water + Formaldehyde + Methyl Isobutyl Ketone/Cyclohexanone) at Different Temperatures

“…The binary solubility data for water + MIBK (or CYC) are plotted in Figures and , which were compared with the references. ,,− The solubility of water and MIBK (or CYC) in this work agrees well with the references. The experimental data for the two mixtures (water + formaldehyde + MIBK) and (water + formaldehyde + CYC) were measured at 303.15, 313.15, and 323.15 K in 101.3 kPa and are listed in Tables and .…”

“…Comparison of the binary solubility data with the references for water + MIBK: (red solid circle), this work; (open square), from ref ; (open circle), from ref ; (green open star), from ref ; (upside down blue open triangle), from ref ; (open diamond), from ref ; (blue open triangle), from ref ; (upside down open triangle), from ref ; (pink open diamond), from ref .…”

Liquid–Liquid Equilibrium for 2-Methyl-2-butanol + Water + o-Xylene at Different Temperatures

“…But the process of separating the azeotrope of 2-methyl-2-butanol and water by salting out has the drawbacks of corrosion, blockage of the distillation column and reboiler, and high energy consumption for treatment of saline waste water. Liquid–liquid extraction has advantages such as large throughput, mild operation conditions, low energy consumption, and high efficiency. − Thus, the process of combination of solvent extraction and distillation was proposed…”