Liquid-liquid equilibrium and physical properties of aqueous mixtures of poly(vinyl pyrrolidone) with potassium phosphate at different pH: Experiments and modeling

Rahmani, Abbas; Rostami, Abbas Ali; Pirdashti, Mohsen; Mobalegholeslam, Poorya

doi:10.1007/s11814-016-0326-9

Cited by 6 publications

(7 citation statements)

References 50 publications

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“…In this study, the extended NRTL , and modified UNIFAC-NRF are used to calculate the phase equilibria of PVPs + KCHO 2 /NaCHO 2 + H 2 O systems using the excess Gibbs energy, G E , which is defined as the sum of three contributions …”

Section: Experimental Evaluationmentioning

confidence: 99%

“…Experimental LLE data (as in Tables 4 and 5) were correlated with the extended NRTL 24 and the modified UNIFAC-NRF model. 27 The LLE correlation was made using the adjusted binary interaction parameters, and it minimized the corresponding objective function (eq 9). The obtained values of the interaction parameters for both models are listed in Tables 6 and 7, respectively.…”

Section: Volumetric Behavior Of the Binodal Curvementioning

confidence: 99%

“…Using an aqueous two-phase system (ATPS), a well-known and highly affordable liquid–liquid extraction technique, can be an impressive method for the extraction and purification of biomolecules − and separation of metal ions, − dyes, − and pharmaceutical compounds. − Besides, it is a simple and low-cost biocompatible extraction method that is efficient for many biological and environmental treatment industries and can be easily scaled up. − Recently, poly(vinyl pyrrolidone) (PVP) has been successfully applied to construct a polymer-salt-based ATPS with many organic and inorganic salts. ,,− It is a water-soluble polymer, inexpensive, and stable and has more features like poly(ethylene glycol) used in biomolecule purification. ,,, Although the PVP is getting the interest of many researchers, a few experimental data were found for the liquid–liquid equilibrium (LLE) data and physical properties of the aqueous mixture of PVP + salt systems.…”

Section: Introductionmentioning

confidence: 99%

“…4,13,20−30 It is a water-soluble polymer, inexpensive, and stable and has more features like poly(ethylene glycol) used in biomolecule purification. 13,26,27,31 Although the PVP is getting the interest of many researchers, a few experimental data were found for the liquid−liquid equilibrium (LLE) data and physical properties of the aqueous mixture of PVP + salt systems.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, in our previous papers, we have reported LLE data for PVP (Mw ave = 60,000)-trisodium citrate 25,26 and PVP (Mw ave = 40,000)-dipotassium hydrogen phosphate. 27 The modified UNIQUAC-NRF 27 model was satisfactorily used to simulate the coexistence phase compositions of these ATPSs.…”

Section: Introductionmentioning

confidence: 99%

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Temperature, Polymer Molecular Weight, and Salt Effects on Phase Equilibria of PVP + Formate Salts + Water: Experimental Measurements, Correlations, and Thermodynamic Modeling

2021

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The phase diagram and liquid−liquid equilibrium data for poly(vinyl pyrrolidone) (PVP) of different molecular weights (10,000, 24,000, or 40,000) + potassium formate (KCHO 2 ) or sodium formate (NaCHO 2 ) aqueous two-phase systems were determined experimentally at different temperatures (298.15, 308.15, and 318.15 K). The phase composition and the tie-line ends were obtained by measuring and correlating the density (ρ) and refractive index (n D ) of binary and ternary mixtures within the range of 0−46.6 wt % of PVP and 0−30 wt % of used salts. Furthermore, the binodal data were fitted to both the Pirdashti and Merchuk equations. The cloud point of PVP solutions was determined in the presence of salt at different concentrations. Additionally, the influence of the polymer's molecular weight and temperature on the binodal curve, tie-line length, and slope of tie-line is discussed and compared with the literature data. Moreover, the impact of the Hofmeister series on the separation factor of formate ion was determined. Finally, the extended NRTL and modified UNIFAC-NRF were used to compute the phase compositions of the studied systems, and the adjusted parameters of the models were reported. Results show that both models provide satisfactory agreement with experimental data.

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Section: Experimental Evaluationmentioning

confidence: 99%

Section: Volumetric Behavior Of the Binodal Curvementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Temperature, Polymer Molecular Weight, and Salt Effects on Phase Equilibria of PVP + Formate Salts + Water: Experimental Measurements, Correlations, and Thermodynamic Modeling

2021

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Aqueous two-phase systems for cephalexin monohydrate partitioning using poly ethylene glycol and sodium tartrate dihydrate: Experimental and thermodynamic modeling

Edrisi

Bakhshi

Rahimnejad

2019

Korean J. Chem. Eng.

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Phase Equilibria of the Ternary System of Lithium Sulfate + Polyethylene Glycol (PEG3000) + Water at Different pH: Experiment Determination, Correlation, and Thermodynamic Modeling

et al. 2022

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The phase equilibrium data for the ternary systems [lithium sulfate (Li2SO4) + polyethylene glycol (PEG3000) + water] were measured at 298.15 K and at various pH values (2.94, 4.90, and 6.80). The solid–liquid equilibrium data including the solubility, density, and refractive index were determined using the isothermal dissolution equilibrium method. The liquid–liquid equilibrium (LLE) data for the aqueous two-phase system were obtained experimentally by measuring the biphasic physical properties, including the density and refractive index at 298.15 K. Subsequently, the binodal curves were correlated by using the Pirdashti and Merchuk equations, the effective excluded volumes were calculated from the binodal curve data, and the tie-line compositions were adjusted to the Othmer–Tobias and Bancroft equations, respectively. Results show that the solubility of Li2SO4 in the aqueous polymeric solution mitigates as the content of PEG increases, eventually. It was found that the more acidic solution induces the salting-out effect, and the LLE formed easily at the lower pH of studied systems. Finally, the extended UNIQUAC, the modified UNIQUAC-FV, and the modified UNIFAC-NRF models were selected to correlate the LLE data of the studied systems, and the modified UNIQUAC-FV model gives a better correlation for tie-lines data.

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Liquid-liquid equilibrium and physical properties of aqueous mixtures of poly(vinyl pyrrolidone) with potassium phosphate at different pH: Experiments and modeling

Cited by 6 publications

References 50 publications

Temperature, Polymer Molecular Weight, and Salt Effects on Phase Equilibria of PVP + Formate Salts + Water: Experimental Measurements, Correlations, and Thermodynamic Modeling

Temperature, Polymer Molecular Weight, and Salt Effects on Phase Equilibria of PVP + Formate Salts + Water: Experimental Measurements, Correlations, and Thermodynamic Modeling

Aqueous two-phase systems for cephalexin monohydrate partitioning using poly ethylene glycol and sodium tartrate dihydrate: Experimental and thermodynamic modeling

Phase Equilibria of the Ternary System of Lithium Sulfate + Polyethylene Glycol (PEG3000) + Water at Different pH: Experiment Determination, Correlation, and Thermodynamic Modeling

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