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Liquid–Liquid Equilibrium of Imidazolium Ionic Liquids + Phosphate + Water Aqueous Two-Phase Systems and Correlation

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Abstract

Binodal curves of the aqueous 1-butyl-3-methylimidazolium tetrafluoroborate([C4mim]BF4) + kosmotropic salt (Na3PO4,(NH4)3PO4) + water aqueous two-phase systems were determined experimentally at 288.15, 298.15, 308.15 and 318.15 K. Three empirical equations were used to correlate the binodal data. All three empirical equations reproduce the data with a high degree of precision. The effect of temperature on the binodal curves was studied. Corresponding to two different salts, the two-phase area decreases with increasing temperature. From the binodal model for these systems, the effective excluded volumes (EEV) were obtained. The binodal curves and EEV both indicate that the salting-out abilities are in the order: Na3PO4 > (NH4)3PO4. And, the reliability of the tie-line compositions was proved by the empirical correlation with the Othmer–Tobias and Bancroft equations. The results show that the salting-out strength is greater at lower temperatures. Additionally, a relatively simple two-parameter equation was used for the correlation of the tie-line data.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21576124, 21676124 and 21878131).

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Authors and Affiliations

  1. School of Computer Science and Communication Engineering, Jiangsu University, Zhenjiang, 212013, People’s Republic of China

    Xu Bao

  2. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, People’s Republic of China

    Zhaohui Chen, Yun Wang, Chunmei Li & Liang Ni

  3. School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, People’s Republic of China

    Juan Han

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Correspondence to Juan Han.

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Bao, X., Chen, Z., Han, J. et al. Liquid–Liquid Equilibrium of Imidazolium Ionic Liquids + Phosphate + Water Aqueous Two-Phase Systems and Correlation. J Solution Chem 48, 1167–1187 (2019). https://doi.org/10.1007/s10953-019-00896-w

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