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Isobaric Vapor–Liquid Equilibrium for the Ethanol + Water + 2-Aminoethanol Tetrafluoroborate System at 101.3 kPa

Xing Liu, Zhigang Lei, Tao Wang, Qunsheng Li, Jiqin Zhu

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Abstract

Isobaric vapor–liquid equilibrium (VLE) data for the ethanol (1) + water (2) system containing the ionic liquid (IL) 2-aminoethanol tetrafluoroborate ([MEA] + [BF 4 ] − ) (3) at atmospheric pressure (101.3 kPa) were measured with a modified Othmer still. The results showed that the azeotropic point can be broken at a specific IL mole fraction, indicating a significant salting-out effect following the order of x 3 = 0.15 > x 3 = 0.10 > x 3 = 0.05. The IL [MEA] + [BF 4 ] − may be a promising entrainer for the separation of ethanol and water with extractive distillation because it exhibits the highest separation ability when compared with other entrainers previously reported. The commonly used nonrandom two-liquid (NRTL) model was used for correlating the measured ternary VLE data.

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What this paper is about

Isobaric vapor–liquid equilibrium (VLE) data for the ethanol (1) + water (2) system containing the ionic liquid (IL) 2-aminoethanol tetrafluoroborate ([MEA] + [BF 4 ] − ) (3) at atmospheric pressure (101.3 kPa) were measured with a modified Othmer still. The results showed that the azeotropic point can be broken at a specific IL mole fraction, indicating a significant salting-out effect following the order of x 3 = 0.15 > x 3 = 0.10 > x 3 = 0.05. The IL [MEA] + [BF 4 ] − may be a promising entrainer for the separation of ethanol and water with extractive distillation because it exhibits the highest separation ability when compared with other entrainers previously reported. The commonly used nonrandom two-liquid (NRTL) model was used for correlating the measured ternary VLE data.

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Available abstract

Isobaric vapor–liquid equilibrium (VLE) data for the ethanol (1) + water (2) system containing the ionic liquid (IL) 2-aminoethanol tetrafluoroborate ([MEA] + [BF 4 ] − ) (3) at atmospheric pressure (101.3 kPa) were measured with a modified Othmer still. The results showed that the azeotropic point can be broken at a specific IL mole fraction, indicating a significant salting-out effect following the order of x 3 = 0.15 > x 3 = 0.10 > x 3 = 0.05. The IL [MEA] + [BF 4 ] − may be a promising entrainer for the separation of ethanol and water with extractive distillation because it exhibits the highest separation ability when compared with other entrainers previously reported. The commonly used nonrandom two-liquid (NRTL) model was used for correlating the measured ternary VLE data.

Key concepts: Chemistry, Isobaric process, Ionic liquid, Tetrafluoroborate, Non-random two-liquid model, Extractive distillation, Ternary operation, Vapor–liquid equilibrium

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