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Measurement and correlation of phase equilibria in aqueous two-phase systems containing ionic liquid ([EOMiM]Br) and potassium citrate/ammonium citrate/potassium tartrate at different temperatures

  • Separation Technology, Thermodynamics
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Abstract

An aqueous two-phase system (ATPS) containing an ionic liquid (1-(2-methoxyethyl)-3-methylimidazolium bromide) and three organic salts (K3C6H5O7, (NH4)3C6H5O7, and K2C4H4O6) at different temperatures was designed. Binodal data were correlated using two empirical equations, and tie-line data were fit with the utilization of Bancroft and Othmer-Tobias equations. In the systems investigated, three conclusions were drawn from the study of the phase-forming ability of salt through effective excluded volume, Gibbs free energy of ions, and the phase diagram. First, if the same cations of salt were present, the ability of salt to form phases increased with increasing valence of the anion. Second, the larger the effective excluded volume, the stronger the aforementioned ability of salt in forming phases. Third, salt had more ability to form phases if cations (or anions) contained in the salt possessed higher negative Gibbs free energy when the cation (anion) of the salt was the same. The effect of temperature on ATPSs was also investigated. It was found that it was easier to form ATPSs at lower temperature, and the tie-line slope showed growing absolute values as the temperature was decreased.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 21606099), the Natural Science Foundation of Jilin Province (No. 20150520062JH and 20180623042TC) and Science and Technology Research Foundation of Jilin Province Department of Education (No. JJKH20170376KJ). We are grateful to Computing Center of Jilin Province for their essential support.

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Authors and Affiliations

  1. Key Laboratory of Preparation and Application of Environmental Friendly Materials, Jilin Normal University, Ministry of Education, Changchun, 130103, China

    Dongdong Wang, Yang Lu, Zhuo Sun, Wei Liang, Dongshu Sun, Changli Qi & ChengZhuo Sheng

  2. Jilin Provincial Key Laboratory for Numerical Simulation, Jilin Normal University, 1301 Haifeng Street, Siping, 136000, China

    Dongdong Wang, Yang Lu, Zhuo Sun, Wei Liang & Xiaopeng Yu

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  1. Dongdong Wang
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  2. Yang Lu
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  3. Zhuo Sun
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  4. Wei Liang
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  7. ChengZhuo Sheng
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  8. Xiaopeng Yu
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Correspondence to Yang Lu or Xiaopeng Yu.

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11814_2019_439_MOESM1_ESM.pdf

Measurement and correlation of phase equilibria in aqueous two-phase systems containing ionic liquid ([EOMiM]Br) and potassium citrate/ammonium citrate/potassium tartrate at different temperatures

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Wang, D., Lu, Y., Sun, Z. et al. Measurement and correlation of phase equilibria in aqueous two-phase systems containing ionic liquid ([EOMiM]Br) and potassium citrate/ammonium citrate/potassium tartrate at different temperatures. Korean J. Chem. Eng. 37, 332–340 (2020). https://doi.org/10.1007/s11814-019-0439-z

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  • DOI: https://doi.org/10.1007/s11814-019-0439-z

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