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Separation of Ethyl Acetate and Ethanol Azeotropic System by Acetate-Based Ionic Liquid

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Abstract

Three ionic liquids (ILs)(1-ethyl-2,3-dimethylimidazolium acetate, [EMMIM][AC]; tributyl-methylammonium acetate, [N4,4,4,1][AC]; and tetraethylammonium acetate, [N2,2,2,2][AC]) were chosen. The vapor–liquid equilibrium (VLE) data of ternary mixtures (acetate + ethanol + IL) were measured at 101.3 KPa. NRTL equation was used to correlate the data. From NRTL model, for [N2,2,2,2][AC], [EMMIM][AC], and [N4,4,4,1][AC], minimum mole fractions for completely eliminating azeotrope are 0.015, 0.020 and 0.022, respectively. From the average relative volatility and σ-profiles, it can be obtained that the separation ability order is [EMMIM][AC] > [N2,2,2,2][AC] > [N4,4,4,1][AC].

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Abbreviations

x i :

Liquid phase mole fraction of component i

\(x^{\prime}_{i}\) :

Liquid phase mole fraction of component i excluding IL

P :

Total pressure in the equilibrium system

\({{P}}_{{i}}^{0}\) :

Saturated vapor pressure of component i

t :

Equilibrium temperature in °C

\({{A}}_{{i}},\) ,\({{B}}_{{i}}{, {C}}_{{i}}\) :

Antoine parameters of component i

x 3 :

Liquid phase mole fraction of IL

n :

Amount of experimental data points

exp:

Experimental values

calc:

Calculated values

K :

K-th data point

α 12 :

Relative volatility of component 1 to component 2

α ij :

Nonstochastic parameters of NRTL model

γ i :

The activity coefficient of component i

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Funding

This work is financially supported by the National Science Foundation of China (Project No. 22278272), the Scientific Research Project of the Education Department of Liaoning Province (Project No. LJKZ0426), the National Science Foundation of China (Project No. 21978173).

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Authors and Affiliations

  1. Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang, 110142, China

    Wenxiu Li, Linzi Zhang, Xin He, Qingfeng Ni & Tao Zhang

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  1. Wenxiu Li
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  2. Linzi Zhang
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  3. Xin He
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Contributions

WL is in charge of the data processing, LZ is in charge of the experiment, XH is in charge of the equipment debugging, QN assisted the experiment, and TZ provides the funds for the experiment and in charge of the analysis and discussion of the paper. All authors reviewed the manuscript.

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Correspondence to Tao Zhang.

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Li, W., Zhang, L., He, X. et al. Separation of Ethyl Acetate and Ethanol Azeotropic System by Acetate-Based Ionic Liquid. J Solution Chem (2024). https://doi.org/10.1007/s10953-023-01361-5

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