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

Abstract

Liquid−liquid equilibrium (LLE) data of the ternary system 2-methyl-2butanol + water + o-xylene were determined at 303.2, 313.2, and 323.2 K under 101.3 kPa. The extraction capacity of o-xylene is expressed by selectivity, which is more than 118 and decreases with the increase of temperature. The quality of the experimental LLE data is verified by calculation of the overall mass balance and alignment between the conjugated phases and overall compositions. The experimental LLE data were regressed by the NRTL and UNIQUAC models, and the binary interaction parameters were obtained. And the root-mean-square deviations (RMSDs) are less than 1.02%.

Measurements and Thermodynamic Modeling of Liquid–Liquid Equilibrium Data for 2-Methyl-2-Butanol + Water + Ethylbenzene

“…Plot of S of various extractants versus w 1 I at various temperatures: (a) ethylbenzene in this work: red solid circle, 303.15 K; red solid star, 313.15 K; and red solid diamond, 323.15 K. (b) o -Xylene: green solid circle, 303.2 K; green solid star, 313.2 K; and green solid diamond, 323.2 K. (c) 2-Butyloxyethanol: black solid circle, 293.15 K and black solid star, 303.15 K. (d) Diethylene glycol monobutyl ether: pink solid circle, 293.15 K; pink solid star, 303.15 K; and pink solid diamond, 313.15 K. (e) Diethylene glycol monohexyl ether: cyan solid circle, 293.15 K; cyan solid star, 303.15 K; and cyan solid diamond, 313.15 K.…”

“…An economically viable solvent should be cheap with a moderate boiling point and should be easily recovered from the components to be separated. In our previous work, o -xylene was used as the extractant for separating the mixture of 2-methyl-2-butanol and water . Ethylbenzene, similar to o -xylene, is almost immiscible in water but completely miscible with 2-methyl-2-butanol.…”

“…In our previous work, o-xylene was used as the extractant for separating the mixture of 2methyl-2-butanol and water. 20 Ethylbenzene, similar to oxylene, is almost immiscible in water but completely miscible with 2-methyl-2-butanol. Thus, it meets the above requirements as an economically feasible extractant.…”