The study of phase behavior of aqueous two-phase system containing [C mim]BF4 (n= 2,3,4) + (NH4)2SO4+ H2O at different temperatures

Xu, Tao; Han, Juan; Hu, Yaoyuan; Wang, Yun; Lu, Yang; Chen, Tong; Ni, Liang

doi:10.1016/j.fluid.2014.09.029

Cited by 21 publications

(19 citation statements)

References 33 publications

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“…This trend is directly related to the decrease of the solubility of [Bmim]BF 4 and CuSO 4 in water with decreasing temperature and indicates that the phase separation for such systems is exothermic. Similar phenomena have been reported for ATPSs formed by aqueous PEG + electrolyte mixtures ,,− and in previous work published by our research group, where the behavior of the phase of ATPSs formed by [Bmim]BF 4 + sulfates of manganese or nickel or zinc + water at different temperatures was evaluated.…”

Section: Resultssupporting

confidence: 87%

“…Salting-out effect of the different cations on the aqueous two-phase systems formed for [Bmim]BF 4 + salt sulfate + H 2 O at 298.15 K: (■) MnSO 4 ; (▼) Li 2 SO 4 ; (▲) MgSO 4 ; (Δ) ZnSO 4 ; (○) NiSO 4 ; (◀) (NH 4 ) 2 SO 4 ; (∇) Na 2 SO 4 ; and (□) CuSO 4 (present work).…”

Section: Resultsmentioning

confidence: 65%

“…Our interest has been understanding how different factors such as the nature of cation and anion, temperature, composition, among others, influence this balance. Recent works have described new ILATPS formed by [Bmim]BF 4 and salt sulfates like MnSO 4 , Li 2 SO 4 , MgSO 4 , ZnSO 4 , , NiSO 4 , and (NH 4 ) 2 SO 4 . , However, a significant part of these publications has been limited to a description of the LLE at a single temperature and, furthermore, considered the equilibrium analysis in terms of a limited amount of experimental information, for example, assuming that there are no significant exchanges of the ionics pairs between the phases. Although this premise has proven to be true, it has not been sufficiently verified experimentally. − …”

Section: Introductionmentioning

confidence: 99%

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Phase Behavior in Aqueous Two-Phase Systems Based-Ionic Liquid Composed of 1-Butyl-3-methylimidazolium Tetrafluoroborate and Copper Sulfate in Different Temperatures

et al. 2019

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Phase behavior of new aqueous two-phase systems (ATPSs) composed by 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) + copper sulfate (CuSO4) + water systems were determined experimentally at T = (283.15, 298.15, and 313.15) K. The phase diagrams obtained at the different study temperatures describe the liquid–liquid equilibrium (LLE) and, in some cases, the liquid–liquid–solid equilibrium for different mixture compositions. The effects of the temperature, composition, and ion exchange in the formation of this ATPS were available. The temperature had a remarkable effect on the position of phase diagrams. The decrease in temperature promoted phase separation indicating the exothermic character of formation of these ATPSs, and further, at temperatures of 283.15 and 298.15 K it was observed that there was phase inversion for some mixture compositions that occurred. The extent of the ionic exchange of the original ionic pairs between the phases in equilibrium was evaluated considering the electroneutrality of the phases. It was observed experimentally that, in the LLE condition established, there was no significant exchange of the ionic pairs. The ability of different cations, from different sulfate salts, to induce the formation of ATPSs in mixtures involving [Bmim]BF4 was evaluated. For this, thermodynamic data of hydration of different cations reported in the literature were used together with experimental data of saturation solubility to establish a scale. Thermodynamic parameters of transfer of components (cations, anions, and water) between the phases were also calculated from the experimental data and indicated that the material transfer of the bottom phase to the top is not spontaneous and tends to be less spontaneous as the length of the tie line value increases. Additionally, the equilibrium data and binodal curves were fitted to an empirical nonlinear expression (Merchuk equation), and the salting out effect was explored using the type-Setschenow equation.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phase Behavior in Aqueous Two-Phase Systems Based-Ionic Liquid Composed of 1-Butyl-3-methylimidazolium Tetrafluoroborate and Copper Sulfate in Different Temperatures

et al. 2019

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“…ATPSs formed by two polymers or a polymer and a salt represent the conventional and most studied systems. However, other alternative biphasic systems have been proposed, such as polymer-surfactant [7], ionic liquid-salt [8] or surfactant-ionic liquid [9]. The different types of ATPSs available offer different features that can be explored to selectively separate biomolecules.…”

Section: Introductionmentioning

confidence: 99%

Polyethylene glycol 8000+ citrate salts aqueous two-phase systems: Relative hydrophobicity of the equilibrium phases

Silvério

Gracia

Teixeira

et al. 2016

Fluid Phase Equilibria

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Polyethylene glycol 8000 + citrate salts aqueous two-phase systems: relative hydrophobicity of the equilibrium phases, Fluid Phase Equilibria (2015), http://dx. AbstractThe Gibbs free energy of transfer of a methylene group, ∆G*(CH 2 ), is reported as a measure of the relative hydrophobicity of the equilibrium phases. Furthermore, ∆G*(CH 2 ) is a characteristic parameter of each tie-line, and for that reason can be used for comparing different tie-lines of a given aqueous two-phase system (ATPS) or even to establish comparisons among different ATPSs. In this work, the partition coefficients of a series of four dinitrophenylated-amino acids were experimentally determined, at 23 ºC, in five different tie-lines of PEG8000-(sodium or potassium) citrate ATPSs. ∆G*(CH 2 ) values were calculated from the partition coefficients and used to evaluate the relative hydrophobicity of the equilibrium phases. PEG8000-potassium citrate ATPSs presented larger relative hydrophobicity than PEG8000-sodium citrate ATPSs. Furthermore, the results obtained indicated that the PEG-rich phase (top phase) has higher affinity to participate in hydrophobic hydration interactions than the salt-rich phase (bottom phase).

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“…As well as in the case of the IL-system, the binodal curves obtained for the polymer-system with Fe(III) at 50 °C ( Figure 8) present a different shape compared to the classical binodal curves found in the literature. [14][15][16] The AAS analyses performed for systems comprising 25 wt% of HCl and 30 wt% of PEG-600 show that 50% of Fe(III) remains in the aqueous phase. The calculation was performed considering an arbitrary volume repartition of 95 wt% of upper phase (aqueous phase) and 5 wt% of lower phase (polymer phase) due to the difficulty to quantify the low amount of bottom phase obtained, starting from a total volume of 10 mL of sample.…”

Section: Il-based Systemsmentioning

confidence: 99%

Uncommon biphasic behaviour induced by very high metal ion concentrations in HCl/H₂O/[P₄₄₄₁₄]Cl and HCl/H₂O/PEG-600 systems

Sinoimeri

Fernandes

Cognard

et al. 2020

Phys. Chem. Chem. Phys.

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The study of phase behavior of aqueous two-phase system containing [C mim]BF4 (n= 2,3,4) + (NH4)2SO4+ H2O at different temperatures

Cited by 21 publications

References 33 publications

Phase Behavior in Aqueous Two-Phase Systems Based-Ionic Liquid Composed of 1-Butyl-3-methylimidazolium Tetrafluoroborate and Copper Sulfate in Different Temperatures

Phase Behavior in Aqueous Two-Phase Systems Based-Ionic Liquid Composed of 1-Butyl-3-methylimidazolium Tetrafluoroborate and Copper Sulfate in Different Temperatures

Polyethylene glycol 8000+ citrate salts aqueous two-phase systems: Relative hydrophobicity of the equilibrium phases

Uncommon biphasic behaviour induced by very high metal ion concentrations in HCl/H₂O/[P₄₄₄₁₄]Cl and HCl/H₂O/PEG-600 systems

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The study of phase behavior of aqueous two-phase system containing [C mim]BF4 (n= 2,3,4) + (NH4)2SO4+ H2O at different temperatures

Cited by 21 publications

References 33 publications

Phase Behavior in Aqueous Two-Phase Systems Based-Ionic Liquid Composed of 1-Butyl-3-methylimidazolium Tetrafluoroborate and Copper Sulfate in Different Temperatures

Phase Behavior in Aqueous Two-Phase Systems Based-Ionic Liquid Composed of 1-Butyl-3-methylimidazolium Tetrafluoroborate and Copper Sulfate in Different Temperatures

Polyethylene glycol 8000+ citrate salts aqueous two-phase systems: Relative hydrophobicity of the equilibrium phases

Uncommon biphasic behaviour induced by very high metal ion concentrations in HCl/H2O/[P44414]Cl and HCl/H2O/PEG-600 systems

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Uncommon biphasic behaviour induced by very high metal ion concentrations in HCl/H₂O/[P₄₄₄₁₄]Cl and HCl/H₂O/PEG-600 systems