Liquid–liquid equilibria of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate and sodium citrate/tartrate/acetate aqueous two-phase systems at 298.15 K: Experiment and correlation

Han, Juan; Yu, Chaoqin; Wang, Yun; Xie, Xueqiao; Yan, Yongsheng; Guo, Yijia; Guan, Weixing

doi:10.1016/j.fluid.2010.03.044

Cited by 87 publications

(72 citation statements)

References 38 publications

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“…From this, knowledge of new ATPSs and its application in purification processes have been well explored by researchers. Since studies of Gutowski and his collaborators (2003) [5], ATPSs composed of ionic liquids and salts were also published [13,14], despite their higher costs compared with aqueous systems composed of PEG and Salt [15].…”

Section: Introductionmentioning

confidence: 99%

Study of liquid-liquid equilibria in aqueous two-phase systems formed by poly (ethylene glycol) (PEG) and sodium thiosulfate pentahydrate (Na2S2O3.5H2O) at different temperatures

Oliveira

Sosa

Costa

et al. 2018

Fluid Phase Equilibria

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This study aimed at providing experimental liquid-liquid equilibrium (LLE) data for aqueous two-phase systems (ATPSs) formed by poly (ethylene glycols) (PEG) of different molecular weights (1500 or 4000 or 6000) g.mol À1 and sodium thiosulfate pentahydrate at different temperatures (293.15e313.15) K and under atmospheric pressure. Correlations of experimental data of binodal curves were carried out using the Merchuk methodology. The effects of temperature, polymer molecular weight and of the nature of the anion of salts on binodal curves were discussed. In comparison with other anions previously investigated, the salting-out ability of the thiosulfate anion was between those of citrate and tartrate anions. Finally, the Othmer-Tobias and Bancroft equations and the NRTL activity coefficient model were used for correlating tie line compositions.

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Section: Introductionmentioning

confidence: 99%

Study of liquid-liquid equilibria in aqueous two-phase systems formed by poly (ethylene glycol) (PEG) and sodium thiosulfate pentahydrate (Na2S2O3.5H2O) at different temperatures

Oliveira

Sosa

Costa

et al. 2018

Fluid Phase Equilibria

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“…Compared to the traditional ATPSs composed of polymer and salt, using the IL instead of salts can adjust the phases' polarities more conveniently [2,18]. For the unique properties of the ILATPSs, many researchers have studied the ILATPSs and obtained numerous thermodynamic data in past decades [19][20][21][22][23]; meanwhile some scientists have researched the application of the ILATPSs in the separation and purification process in the biological area, mainly proteins, amino acids and pharmaceuticals [2,[24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of gold (III) extraction using a novel ionic liquid-based aqueous two phase system without additional extractants

Zheng

Tong

Wang

et al. 2015

Separation and Purification Technology

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“…ILs with low β values are apt to produce ABS. 6,15 19 Figure 4 shows that the anion salts follow the order C 6 …”

Section: ■ Introductionmentioning

confidence: 99%

Phase Behavior of Aqueous Biphasic Systems Composed of Ionic Liquids and Organic Salts

2015

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This study evaluated the effects of ionic liquids (ILs) on the formation of aqueous biphasic systems (ABS) with organic salts. Phase diagrams, tie lines, and respective tie line lengths were determined at 298 K and atmospheric pressure. Using imidazoliumbased ILs, the effects of the IL anions and salt anions, as well as the addition of dipolar aprotic solvents (DAS) on ABS formation were investigated. In general, the IL with hydrogen bond basicity ranging between 0.38 and 0.60 formed ABS with organic salts. However, those below this range were insoluble, and those above this range did not undergo phase separation. The salt anion capacity to induce ABS increased with increased valence and decreased Gibbs free energy of hydration. Moreover, the biphasic area for the IL-based ABS reduced with increased DAS concentration. ■ INTRODUCTIONThe aqueous biphasic system (ABS) is an efficient and green approach to the separation and purification of biomolecules. In recent years, ionic liquid (IL)-based ABS have been significantly explored for the liquid−liquid extraction of a large array of enzymes, 1 biomolecules, 2,3 and polar solutes. 4−6 In IL processing of biomass, ABS is used as an alternative separation method for the recovery and purification of IL from aqueous effluents, and a recovery of over 95 wt % of the IL could be obtained. 7−9 IL-based ABSs are formed when a salt, saccharide, or polymer is dissolved in IL aqueous solutions above critical concentrations. 10−12 A large set of literature data has focused on the ABS composed of IL and inorganic salts, and the effects of the IL nature, salt, pH, and temperature have been evaluated. 10,13−17 However, common inorganic salts lead to environmental problems when discharged at high concentrations into effluent streams. 18 Apart from phosphates, sulfates, and carbonates, organic salts have also been used as possible alternatives for the preparation of IL-based ABS. Given that citrate-based salts are biodegradable and nontoxic, C 6 H 5 K 3 O 7 and C 6 H 5 Na 3 O 7 are extensively explored. 18 Moreover, Han et al. 19,20 showed that the salting-out ability of the anions of organic salts follows the order C 6 H 5 O 7 3+ > C 4 H 4 O 4 2+ > C 4 H 4 O 6 2+ . Nevertheless, a wide variety of organic salts and ILs are absent in most of these systems.The addition of dipolar aprotic solvents (DASs) is a crucial subject regarding the separation and recovery of hydrophilic ILs by forming ABS. However, a systematic study involving these particular systems and addressing the effect of the addition of DAS on the formation of IL-based ABS had not been carried out before. In 2013, Gao et al. 21 were the first to show that dimethyl sulfoxide (DMSO), N,N-dimethylformamide (DMF), and N,N-dimethylacetamide (DMAC), can be used to tune the phase behavior of the ABS composed of 1-butyl-3-methylimidazolium chloride ([C 4 mim]Cl) and K 3 PO 4 . The trends in the density of the two phases, the surface tension, the conductivity, and the dipolarity of the mixtures are dependent on the changes in hydr...

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Liquid–liquid equilibria of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate and sodium citrate/tartrate/acetate aqueous two-phase systems at 298.15 K: Experiment and correlation

Cited by 87 publications

References 38 publications

Study of liquid-liquid equilibria in aqueous two-phase systems formed by poly (ethylene glycol) (PEG) and sodium thiosulfate pentahydrate (Na2S2O3.5H2O) at different temperatures

Study of liquid-liquid equilibria in aqueous two-phase systems formed by poly (ethylene glycol) (PEG) and sodium thiosulfate pentahydrate (Na2S2O3.5H2O) at different temperatures

Mechanism of gold (III) extraction using a novel ionic liquid-based aqueous two phase system without additional extractants

Phase Behavior of Aqueous Biphasic Systems Composed of Ionic Liquids and Organic Salts

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