(Liquid+liquid) equilibrium of (NaNO3+PEG 4000+H2O) ternary system at different temperatures

Jiménez, Yecid P.; Galleguillos, Héctor R.

doi:10.1016/j.jct.2011.05.007

Cited by 32 publications

(6 citation statements)

References 36 publications

(71 reference statements)

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“…For the ATPS PEG400 + sodium citrate, a small expansion of the two-phase region was verified when the system temperature increased. A similar behavior was reported for PEG6000 + sodium citrate 31 as well as for other polymeric-salts ATPS at different temperatures, such as for systems containing PEG4000 + sodium nitrate, 32 and PEG10000 + magnesium sulfate. 33 For PEG400 + sodium phosphate ATPS the temperature effect on the position of the binodal curves was not relevant at the studied range.…”

Section: ■ Materials and Methodssupporting

confidence: 81%

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Measurements and Modeling of Liquid–Liquid Equilibrium of Polyethylene Glycol 400, Sodium Phosphate, or Sodium Citrate Aqueous Two-Phase Systems at (298.2, 308.2, and 318.2) K

et al. 2013

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Experimental equilibrium data were obtained for aqueous two-phase systems composed of polyethylene glycol 400 g·mol–1 + sodium phosphate, and polyethylene glycol 400 g·mol–1 + sodium citrate, at T = (298.2, 308.2 and 318.2) K. For the system formed by sodium phosphate, at the studied range, the temperature effect on the position of the binodal curves was not relevant. For the system composed of sodium citrate, the temperature increase caused an expansion of the biphasic region. The efficacy of the salts in inducing phase segregation follows the order sodium phosphate > sodium citrate at temperatures of (298.2 and 308.2) K. Energy interaction parameters for the NRTL and UNIQUAC models were estimated, and the mean deviations between experimental and calculated compositions were 0.46 % and 0.32 %, respectively. These results show that both models, NRTL and UNIQUAC, are able to represent the phase behavior of polymer–salt aqueous two-phase systems evaluated.

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Section: ■ Materials and Methodssupporting

confidence: 81%

“…A similar trend was observed for PEG4000 + sodium perchlorate ATPS. 34 The salts tested in the present research share a common cation (Na + ). The biphasic region, at (298.2 and 308.2) K, for systems containing sodium citrate was smaller when compared to the biphasic region for systems composed of sodium phosphate.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Measurements and Modeling of Liquid–Liquid Equilibrium of Polyethylene Glycol 400, Sodium Phosphate, or Sodium Citrate Aqueous Two-Phase Systems at (298.2, 308.2, and 318.2) K

et al. 2013

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“…Among all of the components of aqueous two-phase systems (ATPS) including, e.g., polymers, ionic liquids, alcohols, salts, surfactants, sugars, among others, polymer–salt-based ATPSs are one of the most well-known components due to their simplicity, compatibility, and wide varieties. − Most reported research works on polymer–salt-based ATPSs are related to poly(ethylene glycol) (PEG) and inorganic salts such as sulfate, − phosphate, , carbonate, , nitrate, or chloride . Poly(ethylene glycol) possesses superior properties such as low toxicity, neutrality, excellent biocompatibility, and solubility in both aqueous and organic solutions. ,, The information for the phase behavior of the polymer/salt aqueous two-phase systems, therefore, has substantial significance in the applications for much biological and environmental process design.…”

Section: Introductionmentioning

confidence: 99%

Phase Equilibria of Aqueous Two-Phase Systems of PEG with Sulfate Salt: Effects of pH, Temperature, Type of Cation, and Polymer Molecular Weight

et al. 2021

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The present work reports the liquid–liquid equilibrium (LLE) measurements and the construction of binodal curves for polyethylene glycols (PEG) + zinc sulfate/ammonium sulfate + water at three different temperatures (298.15, 303.15, and 308.15 K) and pH values (3.00, 4.70, and 5.21). PEGs with different molecular weights of 2000 g·mol–1 (PEG 2000), 3000 g·mol–1 (PEG 3000), and 8000 g·mol–1 (PEG 8000) were chosen for this study. The phase composition was obtained by measuring the refractive index (n D) and density (ρ) and was further used to obtain the tie-line length (TLL) and the slope of tie-line (STL). The tie-lines are reported at different polymer lengths, pH values, and temperatures. The values of the effective excluded volume (EEV) were employed to analyze the effect of the parameters on the binodal curves. Moreover, the impact of those parameters on the TLL and STL and plait point are discussed and compared with the results of the literature. Furthermore, the binodal curves data and the tie-lines’ ends were fitted using some semiempirical equations with satisfactory results. Finally, the UNIFAC is used to calculate the LLE data of the above system and the adjusted binary group interaction parameters of the model were reported.

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“…In recent years, a large number of experimental phase equilibrium data sets of systems composed of PEG and a salt have been reported. − The study of new polymer–salt systems has been used to improve the technique because of the low cost, the low viscosity, and the rapid phase separation of these systems . Several studies have combined PEG with different types of salts, for example, sulfates, carbonates, chlorides, and nitrates, but no experimental data for PEG + sodium sulfite + water are available in the literature.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Correlation of the Phase Equilibrium of Aqueous Two-Phase Systems Composed of Polyethylene(glycol) 1500 or 4000 + Sodium Sulfite + Water at Different Temperatures

et al. 2014

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The equilibrium behaviors of two-phase liquid−liquid systems composed of poly(ethylene glycol) (PEG) 1500 or 4000 + sodium sulfite + water were experimentally determined at temperatures of (288.15, 298.15, 308.15, and 318.15) K. The effects of the molecular weight of PEG and the temperature on the phase separation were studied. The binodal curves were fitted to an empirical equation that correlates the concentrations of PEG 1500 or 4000 and sodium sulfite, and the coefficients for the different temperatures were estimated. The tie-line compositions were estimated and correlated using the Othmer−Tobias and Bancroft equations, and the parameters are reported. The liquid−liquid equilibrium (LLE) experimental data obtained were wellcorrelated to the activity coefficients of the non-random two-liquid (NRTL) and UNIversal QUAsiChemical (UNIQUAC) models, and the mean deviations were less than 0.36 % and 0.31%, respectively.

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(Liquid+liquid) equilibrium of (NaNO3+PEG 4000+H2O) ternary system at different temperatures

Cited by 32 publications

References 36 publications

Measurements and Modeling of Liquid–Liquid Equilibrium of Polyethylene Glycol 400, Sodium Phosphate, or Sodium Citrate Aqueous Two-Phase Systems at (298.2, 308.2, and 318.2) K

Measurements and Modeling of Liquid–Liquid Equilibrium of Polyethylene Glycol 400, Sodium Phosphate, or Sodium Citrate Aqueous Two-Phase Systems at (298.2, 308.2, and 318.2) K

Phase Equilibria of Aqueous Two-Phase Systems of PEG with Sulfate Salt: Effects of pH, Temperature, Type of Cation, and Polymer Molecular Weight

Measurement and Correlation of the Phase Equilibrium of Aqueous Two-Phase Systems Composed of Polyethylene(glycol) 1500 or 4000 + Sodium Sulfite + Water at Different Temperatures

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