Thermodynamic Investigation of the Aqueous Two-Phase Systems Formed by PEG 400 + Water + Either Sodium Carbonate or Potassium Carbonate at Different Temperatures: Experimental and Correlational Approaches

Carvalho, Roberta de Almeida; Penido, Jussara Alves; Lobo, Fabiana Aparecida; Machado, Poliana Aparecida Lopes; Teixeira, Nelson Henrique Lemes; Virtuoso, Luciano Sindra; Lemos, Leandro Rodrigues de; Rodrigues, Guilherme Dias; Mageste, Aparecida Barbosa

doi:10.1021/acs.jced.8b00546

Cited by 19 publications

(7 citation statements)

References 48 publications

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“…The liquid–liquid equilibrium and binodal curves of PEG 3000 + tri-potassium citrate + water at pH = 8.33, 9.60, and 10.52 were investigated by Ketabi et al Herbst and colleagues studied the phase equilibrium of the ternary system of PEG 6000 , PEG 8000 , and PEG 10000 + C 4 H 4 KNaO 6 + water at T = 283.15, 298.15, and 318.15 K. In another work, Rodrigues et al attempted to study the phase equilibrium for the ATPSs of PEG 1500 + Na 2 SO 4 + water at different temperatures (i.e., T = 293.15, 303.15, and 313.15 K) . Carvalho and co-workers introduced the ternary system of PEG 400 + Na 2 CO 3 or K 2 CO 3 + water to study the thermodynamic equilibrium, temperature, and electrolyte effects . In their work, the binodal data were fitted by the Merchuk equation; the Othmer–Tobias, Bancroft, and Hand equations were used to test the reliability of the experimental tie-lines; and the phase compositions were modeled using the NRTL model .…”

Section: Introductionmentioning

confidence: 99%

“…26 The liquid− liquid equilibrium and binodal curves of PEG 3000 + tri-potassium citrate + water at pH = 8.33, 9.60, and 10.52 were investigated by Ketabi et al 27 Herbst and colleagues 28 29 Carvalho and co-workers introduced the ternary system of PEG 400 + Na 2 CO 3 or K 2 CO 3 + water to study the thermodynamic equilibrium, temperature, and electrolyte effects. 30 In their work, the binodal data were fitted by the Merchuk equation; 31 the Othmer−Tobias, Bancroft, and Hand equations 32 were used to test the reliability of the experimental tie-lines; and the phase compositions were modeled using the NRTL model. 33 Wessner et al used NaCl and LiBr to study the ATPS of PEG 2000 −citrate salts at room temperature and specific pHs.…”

Section: Introductionmentioning

confidence: 99%

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Temperature Effect on the Phase Equilibrium of Polyethylene Glycol 2000 + Trilithium Citrate + Water Aqueous Two-Phase Systems at T = 288.15, 298.15, 308.15, and 318.15 K

Mokarizadeh

Nemati‐Kande

2022

J. Chem. Eng. Data

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Binodal and tie-line mass fractions for ternary polyethylene glycol 2000 + trilithium citrate + water aqueous two-phase systems (ATPSs) were reported at T = 288.15, 298.15, 308.15, and 318.15 K experimentally and modeled thermodynamically. It was found that the extent of the two-phase area of the liquid–liquid equilibrium region was increased as the temperature increased. Also, binodal curves were properly modeled with two nonlinear models, and both models have been successful in fitting the binodal data. Furthermore, the osmotic virial, modified nonrandom two-liquid (m-NRTL), and electrolyte-Wilson models have successfully been implemented in the modeling of the tie-line mass fractions. The quality of fitting with the electrolyte-Wilson and specially m-NRTL models is good, and the uncertainty of the modeled data is in the range of the uncertainty of the experimental data. Also, the salting-out coefficient (k s) of a Setschenow-type equation was applied as a quantitative measure of the salting-out ability. The results of the present work introduce a green and environmentally friendly ATPS for liquid–liquid extraction and purification purposes, which can be used in the separation and purification of drugs, biomaterials, and foods.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temperature Effect on the Phase Equilibrium of Polyethylene Glycol 2000 + Trilithium Citrate + Water Aqueous Two-Phase Systems at T = 288.15, 298.15, 308.15, and 318.15 K

Mokarizadeh

Nemati‐Kande

2022

J. Chem. Eng. Data

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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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“…To the best of our knowledge, there are no data available in the literature for interaction energy between the groups present in the ATPS PEG 8000 + sulfate salts at pH 2.0. Thus, interaction energy parameters between the contribution group were estimated from the experimental tie-line data using the UNIFAC model approach by a Fortran code TML-LLE 2.0 . This code is based on the simplex method and consists of the minimization of an objective function S based on concentration, defined by eq where D is the number of data and N and M are the numbers of components and of tie-lines in each number of data, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, interaction energy parameters between the contribution group were estimated from the experimental tie-line data using the UNIFAC model approach by a Fortran code TML-LLE 2.0. 41 This code is based on the simplex method and consists of the minimization of an objective function S based on concentration, defined by eq 15…”

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confidence: 99%

Thermodynamic Modeling of Aqueous Two-Phase Systems Composed of Macromolecules and Sulfate Salts at pH 2.0

et al. 2019

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Liquid–liquid equilibrium data of aqueous two-phase systems (ATPS) composed of polyethylene glycol (PEG) 8000 + sodium sulfate + water, PEG 8000 + ammonium sulfate + water, and PEG 8000 + magnesium sulfate + water at T = 298.15, 308.15, and 318.15 K and pH 2.0 were determined. The universal function activity coefficient (UNIFAC) model was correlated to the experimental tie-line data, and the root-mean-square deviations (RMSDs) between experimental and calculated data were considered in the calculation. The effects of temperature and cation type on the spinodal curves were evaluated. The salting-out effect was studied by the determination of the effective excluded volume (EEV). Rising temperature resulted in an increase in the biphasic region and tie-lines. Regarding the cation type, the phase-separation abilities followed the order Mg2+ > Na+ > (NH4)+. Increases in the overall composition of the systems resulted in increased tie-line lengths. The tie-line slope absolute values also tended to rise with increasing temperature. Increasing the ATPS constituent concentrations resulted in an increase in the phase densities. The increase in temperature resulted in an increase in the salting-out effect. The exclusion volume values increased in the following order: (NH4)+ < Na+ < Mg2+. The overall mean deviation between the experimental and correlated LLE compositions for the PEG 8000 + ammonium sulfate + water, PEG 8000 + magnesium sulfate + water, and PEG 8000 g mol–1 + sodium sulfate + water was 3.901%. The results of the UNIFAC model agree with the experimental tie-line values. This allows the use of this model to obtain reliable data for this system, thus reducing the number of experiments to be performed for a processing design.

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Thermodynamic Investigation of the Aqueous Two-Phase Systems Formed by PEG 400 + Water + Either Sodium Carbonate or Potassium Carbonate at Different Temperatures: Experimental and Correlational Approaches

Cited by 19 publications

References 48 publications

Temperature Effect on the Phase Equilibrium of Polyethylene Glycol 2000 + Trilithium Citrate + Water Aqueous Two-Phase Systems at T = 288.15, 298.15, 308.15, and 318.15 K

Temperature Effect on the Phase Equilibrium of Polyethylene Glycol 2000 + Trilithium Citrate + Water Aqueous Two-Phase Systems at T = 288.15, 298.15, 308.15, and 318.15 K

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

Thermodynamic Modeling of Aqueous Two-Phase Systems Composed of Macromolecules and Sulfate Salts at pH 2.0

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