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Liquid–Liquid Equilibrium Study of the Ternary System 2-Methyl-2-butanol + Water + n-Heptanol at 303.15 K, 313.15 K and 323.15 K

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Abstract

To separate the azeotrope of 2-methyl-2-butanol and water, n-heptanol was selected as the extractant. Liquid–liquid equilibrium (LLE) data for the ternary system of 2-methyl-2-butanol + water + n-heptanol were measured at 303.15 K, 313.15 K and 323.15 K under 101.3 kPa. The quality of the experimental LLE data was verified by the Hand equation, the Othmer–Tobias equation, and the mass balance between the feed and the conjugated phases. The results show that the correlation coefficients (R2) of the equations are close to 1, the relative error of mass balance is less than 0.7%. The selectivity (S) was used to represent the ability of n-heptanol to extract 2-methyl-2-butanol from water, which is much greater than 133. The experimental data show that S decreases with the mass fraction of 2-methyl-2-butanol in aqueous phase, and increases with equilibrium temperature. The NRTL and UNIQUAC models were used to regress the experimental LLE data, and the corresponding binary interaction parameters were obtained. The root-mean square deviations (RMSDs) indicate that the UNIQUAC model performs better than the NRTL model.

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Authors and Affiliations

  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, PR China

    Xuemei Zhang & Feiyan Yang

  2. Peiyang Chemical Equipment Co., Ltd, Tianjin, 300072, PR China

    Chungui Jian

  3. Zhejiang Medicine Co, Ltd. Changhai Biological Company, Shaoxing, 321366, PR China

    Hongwei Wang, Wangxin Kong, Guangjin Shangguan, Jin Huang, Huangpeng Lu & Longjie Xu

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  1. Xuemei Zhang
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Zhang, X., Yang, F., Jian, C. et al. Liquid–Liquid Equilibrium Study of the Ternary System 2-Methyl-2-butanol + Water + n-Heptanol at 303.15 K, 313.15 K and 323.15 K. J Solution Chem 51, 224–239 (2022). https://doi.org/10.1007/s10953-022-01144-4

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