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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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 53, 1409–1418 (2024). https://doi.org/10.1007/s10953-024-01381-9
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DOI: https://doi.org/10.1007/s10953-024-01381-9