A free-volume modification of GEM-QC to correlate VLE and LLE in polymer solutions

Radfarnia, Hamid R.; Taghikhani, Vahid; Ghotbi, Cyrus; Khoshkbarchi, Mohammad K.

doi:10.1016/j.jct.2004.02.005

Cited by 10 publications

(5 citation statements)

References 31 publications

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“…It can also be observed that for all the surfactants studied, the systems exhibit a lower critical solution temperature, which represents the region of liquid-liquid immiscibility; one phase is water-rich and the other is surfactantrich. [15][16][17]. These results corroborate the evidence given by other researchers [18,19].…”

Section: Flory-huggins Modelsupporting

confidence: 92%

Influence of sodium chloride on the cloud point of polyethoxylate surfactants and estimation of Flory-Huggins model parameters

Araújo

Neto

Chiavone‐Filho

et al. 2015

Rev. Fac. Ing. Antioquia

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In this study, the influence of NaCl on the cloud point of polyethoxylate surfactants from the family of lauryl alcohol polyethoxylates (C 12 EO n ) and nonylphenol polyethoxylates (NPEO n ) was investigated. Liquid-liquid equilibrium curves of the aforementioned aqueous surfactants system with the presence of NaCl were plotted and thermodynamic parameters based on the Flory-Huggins model were obtained. The visual method was used to determine the cloud point. Solutions containing surfactant concentrations between 0.5 and 20% (by weight) and NaCl between 4.9 and 12.1% (by weight) were prepared. Salt had a salting-out effect, decreasing surfactant solubility in water. Furthermore, the cloud point decreased with an increase of NaCl concentration. The Flory-Huggins model satisfactorily described the experimental data for all surfactant + NaCl aqueous mixtures studied. ---------

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Section: Flory-huggins Modelsupporting

confidence: 92%

Influence of sodium chloride on the cloud point of polyethoxylate surfactants and estimation of Flory-Huggins model parameters

Araújo

Neto

Chiavone‐Filho

et al. 2015

Rev. Fac. Ing. Antioquia

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show abstract

“…Some of models have presented based on the van der Waals theory while several authors [7]- [15] further developed the models according to the lattice base. These bases have been used for the development of various activity coefficient models as well as equations of state [16].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Vapor-Liquid Equilibrium of Polypropylene Oxide Solution Systems by Cubic Equations of State

Karimi¹,

Rahimi²,

Ahmadloo³

2014

IJCEA

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“…Some models have been based on the van der Waals theory, while several authors [11][12][13][14] further developed the models according to the lattice base. These bases have been applied for the expansion of various activity coefficient models, as well as equations of state (EoS) [15].…”

Section: Introductionmentioning

confidence: 99%

Modeling of vapor-liquid equilibrium for binary polypropylene glycol/solvent solutions using cubic equation of state models: optimization and comparison of CEoS models

Ahmadloo

Sobhanifar

Hosseini

2014

Journal of Polymer Engineering

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The cubic equation of state (CEoS) is a powerful method for calculation of the vapor-liquid equilibrium (VLE) in polymer solutions. Using CEoS for both the vapor and liquid phases allows one to calculate the non-ideality of polymer solutions based on a single EoS approach. In this research, VLE calculations of polypropylene glycol (polypropylene oxide) [PPG(PPO)]/solvent solutions were carried out. In this approach, eight models containing Peng-Robinson-Stryjek-Vera (PRSV) and Soave-Redlich-Kwong (SRK) CEoS separately combined with four mixing rules, namely van der Waals one-fluid mixing rule with one adjustable parameter (vdW1), van der Waals one-fluid mixing rule with two adjustable parameters (vdW2), Wong-Sandler (WS), and ZhongMasuoka (ZM) were applied to calculations of bubble point pressure. For a better correlation, the adjustable binary interaction parameters existing in any mixing rule were optimized. The results were very acceptable and satisfactory. The results of absolute average deviations (%AAD) between computed results and experimental bubble point pressure data were calculated and presented. Although the capability of two CEoS had a good agreement with experimental data and illustrated the correct type of phase behavior in all cases, the performance of the PRSV+vdW2 was more reliable than the other models.

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A free-volume modification of GEM-QC to correlate VLE and LLE in polymer solutions

Cited by 10 publications

References 31 publications

Influence of sodium chloride on the cloud point of polyethoxylate surfactants and estimation of Flory-Huggins model parameters

Influence of sodium chloride on the cloud point of polyethoxylate surfactants and estimation of Flory-Huggins model parameters

Prediction of Vapor-Liquid Equilibrium of Polypropylene Oxide Solution Systems by Cubic Equations of State

Modeling of vapor-liquid equilibrium for binary polypropylene glycol/solvent solutions using cubic equation of state models: optimization and comparison of CEoS models

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