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Effect of Salt Mixtures on Aqueous Two-Phase System Composed of PEG 35000: Experiment and Correlation

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Abstract

An aqueous two-phase system (ATPS) composed of PEG35000, Na2CO3, K2CO3, and their mixtures at 298 K was studied. The liquid–liquid equilibrium (LLE) of these systems, including binodal curves, tie-lines, tie-line length, and slope of the tie-line, were obtained. Additionally, for the first time, salt mixtures with different initial mass ratios of 1:3, 1:1, and 3:1 were used to prepare the aqueous two-phase systems. The effect of electrolyte and salting-out power for these systems was examined and compared. Consistent with the literature, it was found that the salting-out power of Na+ is higher than that of the K+ cation. Furthermore, in Na2CO3 and K2CO3 mixtures, increasing the amount of sodium ions resulted in stronger salting-out power. The LLE data was correlated with the Othmer-Tobias, Bancroft, and Setschenow models, and good agreement was found with all three models.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Basic Science, Ayatollah Boroujerdi University, Boroujerd, Iran

    Hossein Dashti Khavidaki & Zahra Asadi

  2. Department of Chemistry, Faculty of Science, Arak University, Arak, Iran

    Alireza Salabat

Authors
  1. Hossein Dashti Khavidaki
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  2. Zahra Asadi
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  3. Alireza Salabat
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Correspondence to Hossein Dashti Khavidaki.

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Khavidaki, H.D., Asadi, Z. & Salabat, A. Effect of Salt Mixtures on Aqueous Two-Phase System Composed of PEG 35000: Experiment and Correlation. J Solution Chem (2024). https://doi.org/10.1007/s10953-024-01381-9

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