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

Abstract

For the separation of 2,2,2-trifluoroethanol in water, two alcohols and two ketones were chosen as extractants for experiments at 101.3 kPa and 298.2 K. The liquid−liquid equilibrium data for water + 2,2,2-trifluoroethanol + (4-methyl-2-pentanol, methyl isobutyl ketone, methyl isopropyl ketone, and benzyl alcohol) were measured under these conditions. The separation effects of the four solvents were assessed by the distribution coefficient (D) and the separation factor (S). Meantime, the interaction parameters were obtained by fitting the experimental data using NRTL and UNIQUAC models, and both values of AAD and rmsd were less than 0.43%. The GUI-MATLAB series of topological analysis tools were used to check the accuracy of the measured values with the binary interaction parameters.

Liquid–Liquid Equilibrium for Ternary Systems 2,2,2-Trifluoroethanol + Water + (Ethyl Acetate/Isopropyl Acetate/Isobutyl Acetate) at 308.15 K under 101.3 kPa

“…Distribution constant for the ternary mixtures (water + TFE + ethyl acetate/isopropyl acetate/isobutyl acetate) at temperature 308.15 K: ■, isobutyl acetate; ◆, ethyl acetate; ●, isopropyl acetate; □, MIBK from ref ; ○, n -propyl acetate from ref ; ▷, 2-octyl alcohol from ref .…”

“…Han et al measured the LLE data for the four mixtures {(TFE + water + dichloromethane), (TFE + water + 2-ethyl-1-hexanol), (TFE + water + n -propyl acetate), and (TFE + water + isopentanol)} at 303.2 K. Among them, the ester n -propyl acetate has higher D and S for TFE than the alcohols and dichloromethane, which is more suitable as an extractant for separating TFE from its aqueous mixture. Lin et al measured the LLE data for the four mixtures {(TFE + water + methyl isopropyl ketone), (TFE + water + methyl isobutyl ketone), (TFE + water + benzyl alcohol), and (TFE + water + 4-methyl-2-pentanol)} recover at 298.2 K. The results revealed that the ketone solvents, especially methyl isobutyl ketone (MIBK), have much higher D and S for TFE than the alcohols. Based on the results of the literature, it can be inferred that the extractants n -propyl acetate and MIBK can separate fluor-alcohols from azeotropic mixtures with low fluor-alcohol content since esters are more environmentally friendly, less costly, and easier to store compared to ketones. − Therefore, in view of industrial operation and environmental impact, isobutyl acetate, ethyl acetate, and isopropyl acetate were selected as the extractants to extract TFE from the azeotropic mixture with a higher concentration of TFE by LLET.…”

“…Lin et al 4 data for the four mixtures {(TFE + water + dichloromethane), (TFE + water + 2-ethyl-1-hexanol), (TFE + water + n-propyl acetate), and (TFE + water + isopentanol)} at 303.2 K. Among them, the ester n-propyl acetate has higher D and S for TFE than the alcohols and dichloromethane, which is more suitable as an extractant for separating TFE from its aqueous mixture. Lin et al 14 18−20 model, and topological analysis of the binary interaction parameters was performed using the graphical user interface (GUI) tool provided by Marcilla and Reyes-Labarta et al 21,22 2. EXPERIMENTAL SECTION 2.1.…”