Liquid–Liquid Equilibrium Data of Macromolecule + Ammonium Thiosulfate + Water Ternary Systems at 283.2, 298.2, and 313.2 K

Abstract

Liquid−liquid equilibrium data were obtained for aqueous two-phase system (ATPS) composed of [poly(ethylene oxide) (PEO1500), poly(propylene oxide) (PPO425), poly(ethylene oxide) 11 −poly(propylene oxide) 17 −poly(ethylene oxide) 11 (L35), or poly(propylene oxide) 8 −poly(ethylene oxide) 22 −poly(propylene oxide) 8 (10R5)] + ammonium thiosulfate + water, at 283.2, 298.2, and 313.2 K. The consistencies of the all tie-line experimental compositions were improved by applying the Othmer− Tobias and Bancroft equations, resulting in linear correlation coefficients (R 2 ) ≥ 0.95. For all the ATPS, an increase in the temperature resulted in increases in the biphasic region and the tie-line slope, indicating that the phase separation process was entropically driven. Among the macromolecules studied, PPO425 produced the largest biphasic region, due to its greater hydrophobicity, followed by L35 ≈ 10R5 > PEO1500.

Liquid–Liquid Equilibrium Data of Ternary Mixture of Polymer, Sodium Thiosulfate, and Water: Effect of Type and Molar Mass of Macromolecule

“…Thus, the systems formed by F68, a more hydrophobic copolymer, present a biphasic area larger than that of the systems formed by L64. This behavior is similar to that obtained in the study of the effect of the nature of the macromolecule on the position of the binodal curve in ATPS formed by PEG1500 or PPO425 or L35 or 10R5 + ammonium thiosulfate + water …”

“…This behavior is similar to that obtained in the study of the effect of the nature of the macromolecule on the position of the binodal curve in ATPS formed by PEG1500 or PPO425 or L35 or 10R5 + ammonium thiosulfate + water. 31 Also, in relation to this comparison, a greater difference between the binodal curves for the two macromolecules is observed in the BP region, where the salt concentrations in this phase in ATPS formed by F68 are much lower than those formed by PEG10k. These results show that sodium thiosulfate has a higher salting-out effectiveness compared to the aqueous solution of the more hydrophobic macromolecule F68, inducing phase segregation at lower concentrations.…”

Effect of Temperature on the Phase Equilibria of Poly(vinylpyrrolidone) 10000 + Trilithium Citrate + Water Aqueous Two-Phase System and Partitioning of Curcumin at T = 298.15, 308.15, and 318.15 K

“…The polymer–salt system is a mixture of a water-soluble polymer and an inorganic salt . Several polymer–salt systems have been studied previously, ,,− but the role of temperature in these systems is not well investigated. Muniz et al .…”

Measurement and Correlation of Liquid–Liquid Equilibrium for the Ternary System 1-Octyl-3-methylimidazolium Tetrafluoroborate + 1-Ethyl-3-methylimidazolium Tetrafluoroborate + Water

“…The values of the fitted parameters are shown in Table , where a , b , c , and d are parameters, and R 2 is the determination coefficient. The correlation results of the two equations are shown in Figures and , and R 2 is greater than 0.97, which indicates that the measured liquid–liquid phase equilibrium data are reliable. − The thermodynamic consistency of the LLE data was also checked by the method proposed by Marcilla et al, which was conducted by the MATLAB code (GMcal_TieLinesLL)…”