Liquid–Liquid Equilibrium Data, Viscosities, Densities, Conductivities, and Refractive Indexes of Aqueous Mixtures of Poly(ethylene glycol) with Trisodium Citrate at Different pH

Pirdashti, Mohsen; Movagharnejad, Kamyar; Rostami, Abbas Ali; Akbarpour, Pegah; Ketabi, Mahnam

doi:10.1021/acs.jced.5b00705

Cited by 29 publications

(31 citation statements)

References 44 publications

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“…The density reduction with increasing temperature can be attributed to the greater vibration and agitation of the molecules of the liquid, which cause a possible increase of the volume and, consequently, fewer molecular interactions. 40 Similar behavior was also found for other systems containing polymers and salts, as in Shahrokhi et al 41 which studied the ATPS PEG 1500 and zinc sulfate at 298.15 K and in various pH values (2.54, 3.57, and 4.70), Pirdashti et al 42 which evaluated the density of the phases in PEG 3000 and trisodium citrate at 298.15 K and different pH values (6.1, 7.5, and 9.0) and Taboada et al 43 that determined the density of the phases in PEG 4000 and sodium sulfate at 298.15 K.…”

Section: Journal Of Chemical and Engineering Datasupporting

confidence: 68%

Liquid–Liquid Equilibrium Data and Thermodynamic Modeling for Aqueous Two-Phase System Peg 1500 + Sodium Sulfate + Water at Different Temperatures

Barreto¹,

Castro²,

Júnior³

et al. 2019

J. Chem. Eng. Data

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Liquid–liquid equilibrium data of aqueous two phase systems (ATPS) composed of polyethylene glycol (PEG) 1500 g·mol–1 + sodium sulfate + water at T = (293.15, 303.15 and 313.15) K and p = 0.1 MPa were determined. The density of the top and bottom phases of tie-lines (TL) was determined. The universal functional activity coefficient (UNIFAC) model was correlated to the experimental tie-line data, and the root-mean-square deviations (RMSD) between experimental and calculated data were considered in the calculation. The salting-out effect was evaluated using the model of the effective volume (EEV). The temperature had no influence on the binodal curves and TL, this effect can be attributed to a small enthalpic contribution in the phase separation process. Increases in the ATPS constituents concentrations resulting in an increase in the density of the phases. The increase in temperature resulted in an increase in the salting-out effect. The highest estimated value of EEV was obtained for a system at 293.15 K. Calculated RMSD between the experimental and predicted LLE compositions for the PEG 1500 + sodium sulfate systems was 1.71%. The results of the UNIFAC model agree with the experimental tie-line values. The use of this thermodynamic model allowed the acquisition of reliable data for the system, being able to reduce the number of experiments performed.

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Section: Journal Of Chemical and Engineering Datasupporting

confidence: 68%

Liquid–Liquid Equilibrium Data and Thermodynamic Modeling for Aqueous Two-Phase System Peg 1500 + Sodium Sulfate + Water at Different Temperatures

Barreto¹,

Castro²,

Júnior³

et al. 2019

J. Chem. Eng. Data

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“…It is important to note that temperature control is essential during the whole experimental procedure. The experimental procedure has been described in detail in previous studies, ,− and all devices used in this study were essentially the same as in our previous work . Stock solutions of PEGs (50 and 80 wt %), zinc sulfate (30 wt %), and ammonium sulfate (40 wt %) were prepared.…”

Section: Experimental Evaluationmentioning

confidence: 99%

“…The experimental data obtained were correlated using the Merchuk, Pirdashti, and Jayapal models (or eqs –) where a , b , and c represent adjusted parameters and w p and w s depict the polymer and salt mass fractions, respectively.…”

Section: Experimental Evaluationmentioning

confidence: 99%

“…PEGs of different molecular weights, namely, PEG 2000, PEG 3000, and PEG 8000, were selected to assess their effect on the formation of ATPS. The experimental data were further utilized to construct the binodal curves, and they were successfully fitted using the Merchuk, Pirdashti, and Jayapal equations. Furthermore, the influence of cation type on the salting-out ability was discussed by incorporating the effective excluded volume (EEV) model. , Finally, the LLE data were fitted the UNIFAC model and the binary group interactions were calculated.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Pd-catalyzed reactions (the importance of these can be seen in the 2010 Nobel prize award for their discovery) have also been carried out in PEG under both homocatalytic and heterocatalytic conditions where Pd is immobilized onto a porous silica material. − PEGs have also been successfully used as components in deep eutectic solvents. − Despite all of these successes, there are only limited experimental and theoretical studies on the dynamics of neat PEG. − Experimental physicochemical properties of PEGs are needed to further this effort. In this respect, densities and viscosities have been repeatedly reported for several polydisperse PEGs usually as part of studies on binary mixtures involving polydisperse PEGs. − The polydisperse PEGs are composed of mixtures of PEG oligomers with approximately a Gaussian mole fraction distribution around the mean chain length. ,, It is likely that the exact mole fraction distribution may vary from vendor to vendor and possibly even from batch to batch. Unfortunately, a composition analysis of polydisperse PEGs is typically not included in the above cited studies.…”

Section: Introductionmentioning

confidence: 99%

Densities, Viscosities, and Self-Diffusion Coefficients of Ethylene Glycol Oligomers

Hoffmann

Horowitz

Gutmann³

et al. 2021

J. Chem. Eng. Data

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Polyethylene glycol (PEG) is gaining interest as an alternative green solvent in chemical synthesis and processing. This report presents density and viscosity data from 293.15 K to 358.15 K as well as self-diffusion coefficient data from 298.15 K to 358.15 K for oligomers of PEG from di-to nonaethylene glycol. The results were obtained by extrapolation from measurement series where water, the most common impurity in PEGs, was intentionally added in several increments. The obtained results are carefully compared to literature data, which are widely available only for density and viscosity, and only for the lower oligomers. Densities are found to be linearly dependent on temperatures for all studied oligomers. The temperature dependence of viscosity and self-diffusion coefficients show only slight deviations from the Arrhenius equation over the investigated temperature range. The activation energies obtained from the viscosity data agree well with the activation energies from the self-diffusion coefficient data and appear to be linearly dependent with respect to the number of ethylene oxide repeat units in the PEG oligomer. This linearity combined with the observation that the pre-exponential factor appears to be the same for all studied oligomers may serve as a tool to estimate viscosities and self-diffusion coefficients for higher oligomers within the investigated temperature range. The densities of the oligomers all fall within a rather narrow range without a clear trend in homologous series.

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Liquid–Liquid Equilibrium Data, Viscosities, Densities, Conductivities, and Refractive Indexes of Aqueous Mixtures of Poly(ethylene glycol) with Trisodium Citrate at Different pH

Cited by 29 publications

References 44 publications

Liquid–Liquid Equilibrium Data and Thermodynamic Modeling for Aqueous Two-Phase System Peg 1500 + Sodium Sulfate + Water at Different Temperatures

Liquid–Liquid Equilibrium Data and Thermodynamic Modeling for Aqueous Two-Phase System Peg 1500 + Sodium Sulfate + Water at Different Temperatures

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

Densities, Viscosities, and Self-Diffusion Coefficients of Ethylene Glycol Oligomers

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