Liquid–liquid equilibria of aqueous two-phase systems containing polyethylene glycol 4000 and di-potassium tartrate, potassium sodium tartrate, or di-potassium oxalate: Experiment and correlation

Zafarani-Moattar, Mohammed Taghi; Tolouei, Shahram

doi:10.1016/j.calphad.2008.09.006

Cited by 55 publications

(28 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, phase diagram data of the ethanol-K 3 PO 4 ATPS at (298. 15 and 313.15) K have not been reported. Citrates have the advantages of biodegradability and nontoxicity over the traditional phase-forming inorganic salts.…”

Section: Introductionmentioning

confidence: 80%

Liquid−Liquid Equilibrium of Potassium Phosphate/Potassium Citrate/Sodium Citrate + Ethanol Aqueous Two-Phase Systems at (298.15 and 313.15) K and Correlation

et al. 2010

View full text Add to dashboard Cite

Binodal data for the ethanol + K 3 PO 4 /K 3 C 6 H 5 O 7 /Na 3 C 6 H 5 O 7 + water systems were experimentally determined at (298.15 and 313.13) K. On the basis of the binodal data fitting equation with the highest accuracy and the Lever rule, the liquid-liquid equilibrium data for the investigated systems at 298.15 K were directly calculated by MATLAB. The Othmer-Tobias equation and Bancroft equation were used to correlate tie-line data and evaluate the reliability of the calculation method and the corresponding tie-line data. The salting-out strength of salt ions was compared by the parameter of effective excluded volume and the binodal curves plotted in molality, while the salting-out strength of salts was compared by the parameter of salting-out coefficient and the binodal curves plotted in mass fraction. The salting-out strength of the investigated salts is in the order K 3 PO 4 > Na 3 C 6 H 5 O 7 > K 3 C 6 H 5 O 7 . As for salt ions, the salting-out strength of anions is in the order PO 43-< C 6 H 5 O 7 3-, while the salting-out strength of Na + is similar to K + . The effects of salt, hydrophilic alcohol, and temperature on liquid-liquid equilibria were also discussed. The shapes and locations of binodal curves are not sensitive to the investigated temperature range. The additions of salt and ethanol both increase the tie-line length and the absolute value of the tie-line slope.

show abstract

Section: Introductionmentioning

confidence: 80%

Liquid−Liquid Equilibrium of Potassium Phosphate/Potassium Citrate/Sodium Citrate + Ethanol Aqueous Two-Phase Systems at (298.15 and 313.15) K and Correlation

et al. 2010

View full text Add to dashboard Cite

show abstract

“…For that reason, more recent studies point out citrate and tartrate salts as an effective alternative. Liquid–liquid equilibrium measured at different conditions, can be found in the literature for systems composed of sodium citrate and PEG of different molecular weights (400, 600, , 1000, ,, 1450, 1500, 2000, 3350, , 4000, 6000, , and 8000 g/mol), potassium citrate and PEG (2000, 6000, and 8000 g/mol), sodium tartrate and PEG (600, 1000, 2000, 4000, 6000, and 8000 g/mol), potassium tartrate and PEG (4000 g/mol), and potassium sodium tartrate and PEG (4000 g/mol).…”

Section: Introductionmentioning

confidence: 99%

Influence of the Molecular Weight of PEG on the Polymer/Salt Phase Diagrams of Aqueous Two-Phase Systems

Wysoczanska

Macedo

2016

J. Chem. Eng. Data

View full text Add to dashboard Cite

Binodal data for systems composed by polyethylene glycol (PEG) (4000, 6000, or 8000) and salt (potassium citrate, potassium sodium tartrate) were obtained using the cloud point method, at T = 298.15 K. Merchuk equation was applied for the fitting of binodal curves. Tie-lines for systems of PEG (4000, 6000)–potassium citrate and PEG (4000, 6000, 8000)–potassium sodium tartrate were determined by electrical conductivity and lyophilization, and correlated using Othmer–Tobias and Bancroft equations, to verify the reliability of the measured tie-lines. Data were compared with that of previous studies reported in the literature, giving an indication of which system is more efficient in terms of separation, taking into account possible combinations of salt’s cations and PEGs of different molecular weight chosen for ATPS.

show abstract

“…Where a, b and c are adjustment parameters and w 1 and w 2 are the mass fractions of the MIL and salt, respectively. This equation has been widely used to fit the binodal curves of polymer + salt ATPs [39], IL + salt ATPs [40] and ATPs based on hydrophilic organic solvents. In this work, Eq 7is satisfactorily used to fit the binodal data of our investigated systems.…”

Section: Binodal Data and Correlationmentioning

confidence: 99%

Measurement and correlation of phase equilibria in aqueous two-phase systems containing functionalized magnetic ionic liquids and K2HPO4/K2CO3/Na2CO3 at 298.15 K

Yao

Huang

Zang

et al. 2017

Journal of Molecular Liquids

View full text Add to dashboard Cite

Functionalized magnetic ionic liquids (MILs)([C 2 TMG][TEMPO-OSO 3 ], [C 3 TMG][TEMPO-OSO 3 ], [C 4 TMG][TEMPO-OSO 3 ]) and three inorganic salts (K 2 HPO 4 /K 2 CO 3 /Na 2 CO 3) were used to form aqueous two-phase system at 298.15 K. Three classical experienced equations were applied for the correlations of the binodal curves. All of them demonstrated satisfactory performance in data association. The binodal curves were investigated in detail. Both K 2 HPO 4 and K 2 CO 3 was excellent phase forming salts for all the three MILs. Both of them can meet the need of practical applications. There is a narrow biphasic region for the MIL+ Na 2 CO 3 +water system because of a relatively low solubility of salt in water. Additionally, tie-line data were experimentally obtained for the three MILs with K 2 HPO 4 or K 2 CO 3 at 298.15K. Three empirical formulas including Othmer-Tobias equation, Bancroft equation together with another equation derived from binodal theory were used to fit the tie-line data. Consequently, Othmer-Tobias has shown ideal correlation performance and the reliability of our experimental tie-line data can be ensured. Hopefully, these aqueous two-phase equilibrium data should be useful in the areas of chemical separation, purification and analysis.

show abstract

Liquid–liquid equilibria of aqueous two-phase systems containing polyethylene glycol 4000 and di-potassium tartrate, potassium sodium tartrate, or di-potassium oxalate: Experiment and correlation

Cited by 55 publications

References 21 publications

Liquid−Liquid Equilibrium of Potassium Phosphate/Potassium Citrate/Sodium Citrate + Ethanol Aqueous Two-Phase Systems at (298.15 and 313.15) K and Correlation

Liquid−Liquid Equilibrium of Potassium Phosphate/Potassium Citrate/Sodium Citrate + Ethanol Aqueous Two-Phase Systems at (298.15 and 313.15) K and Correlation

Influence of the Molecular Weight of PEG on the Polymer/Salt Phase Diagrams of Aqueous Two-Phase Systems

Measurement and correlation of phase equilibria in aqueous two-phase systems containing functionalized magnetic ionic liquids and K2HPO4/K2CO3/Na2CO3 at 298.15 K

Contact Info

Product

Resources

About