Renormalization group corrections to the modified perturbed hard sphere chain equation of state for vapor liquid equilibria and interfacial tension of pure and binary mixtures

Choi, Ji Su; Bae, Young Chan

doi:10.1016/j.fluid.2016.09.029

Cited by 10 publications

(10 citation statements)

References 74 publications

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“…The larger molecules of n -hexane have stronger attractive intermolecular (dispersive) interactions at the interface that produce greater IFT values. This trend is the same as what has been reported in the literature for pure n -alkanes, where heavier species have higher IFT values . Our results showed that the trend could also be valid for binary mixtures of n -alkanes with a common accompanying component.…”

Section: Resultssupporting

confidence: 91%

“…This trend is the same as what has been reported in the literature for pure nalkanes, where heavier species have higher IFT values. 27 Our results showed that the trend could also be valid for binary mixtures of n-alkanes with a common accompanying component. In Figure 6a, it is also observed that, at the same temperature, the difference between the IFTs of the two fluid systems decreases with increasing pressure.…”

Section: ■ Results and Discussionsupporting

confidence: 58%

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Effects of Temperature and Pressure on Interfacial Tensions of Fluid Mixtures. II. Propane/n-Pentane and Propane/n-Hexane Binaries

et al. 2021

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We use the experimental setup and protocols described in Toutouni et al. (Effects of Temperature and Pressure on Interfacial Tensions of Fluid Mixtures. I. CO2/n-Pentane Binary. J. Chem. Eng. Data, 2021, DOI 10.1021/acs.jced.0c01044) to examine the impacts of temperature and pressure on interfacial tensions (IFT) of binary hydrocarbon systems propane/n-pentane and propane/n-hexane. The pressure and temperature vary from 0.2 to 3.5 MPa and 323.15 to 403.15 K for the propane/n-pentane fluid system and from 0.18 to 3.5 MPa and 296.15 to 403.15 K for the propane/n-hexane fluid system. The results indicate that the IFT values of both fluid systems follow the same trends with changes in pressure and temperature. It is observed that when pressure increases isothermally, the IFT values decrease. Furthermore, when increasing temperature isobarically, the IFT values exhibit a decreasing trend at low pressures, but the trend reverses at higher pressures. The measured data also reveal that, at a given pressure and temperature, the IFT value of the propane/n-pentane system is lower than that of the propane/n-hexane system. The difference between the two IFT values decreases as pressure increases isothermally.

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Section: Resultssupporting

confidence: 91%

Section: ■ Results and Discussionsupporting

confidence: 58%

Effects of Temperature and Pressure on Interfacial Tensions of Fluid Mixtures. II. Propane/n-Pentane and Propane/n-Hexane Binaries

et al. 2021

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“…30 There are plenty of research works employing thermodynamics to calculate the surface tension. [31][32][33][34][35][36][37][38] In particular, Prigogine and collaborators presented a relatively simple theory to explain the surface tension of polymer solutions on the basis of thermodynamics. 31 Afterward, the surface tension of several polymer solutions is investigated by Siow and Patterson on the basis of the F-H theory.…”

Section: Introductionmentioning

confidence: 99%

“…Thermodynamic modeling for the surface tension of mixtures are typically derived on the assumption that the interface is considered a thin layer separated from the vapor and bulk liquid 30 . There are plenty of research works employing thermodynamics to calculate the surface tension 31–38 . In particular, Prigogine and collaborators presented a relatively simple theory to explain the surface tension of polymer solutions on the basis of thermodynamics 31 .…”

Section: Introductionmentioning

confidence: 99%

Phase equilibria and surface tension in castor oil‐based polyols‐water–methanol mixture: Thermodynamic basis

Moon

Yang

Lee

et al. 2020

J of Applied Polymer Sci

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Considering the current environmental issues with petro-polymers, castor oil is a promising green alternative to the polyols to be used as the main raw material for polyurethane. However, the basic information regarding the processability of castor oil-based polyol (CP) such as its miscibility in different solvents is still elusive. Herein we have investigated the phase equilibria and surface tension of various CP solutions using thermo-optical analysis and pendent drop method, respectively. The modified double lattice (MDL) model was employed to theoretically describe those phase equilibria and surface behaviors. The phase diagrams of CPs/methanol binary systems represent upper critical solution temperature (UCST) behaviors, and CPs/methanol/water ternary systems show Treybal Type 2 behaviors. The surface tension results exhibit preferential solvent adsorption, which means affinity of the solvent to be present in surface is higher than that of the polymer. The calculated results showed good agreement with the experimental observations.

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“…Thus far, many authors have applied this method using different mean-field theories (e.g. Mean-Spherical Approximation (MSA) [26], equation of state for chain-like molecules [29,30], the SAFT equation and its variants [31,32,33,34,35,36,37,38,39,40], cubic equations [41,42,43,44,45,46,47,48], and others [49,50]), obtaining similarly good results. However, some aspects in the method are still unclear, including parameter estimation procedures and approximations in the renormalization equations.…”

Section: Introductionmentioning

confidence: 99%

Renormalization Group Theory Applied to the CPA Equation of State: Impacts on Phase Equilibrium and Derivative Properties

Silva

Abreu

Tavares

2019

Preprint

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Calculation of thermodynamic properties such as vapor-liquid phase behavior with equations of state is largely and successfully employed in chemical engineering applications.<br>However, in the proximities of the critical point, the different density-fluctuation scales inherent to critical phenomena introduce significant changes in these thermodynamic properties, with which the classical equations of state are not prepared to deal.<br>Aiming at correcting this failure, we apply a renormalization-group methodology to the CPA equation of state in order to improve the thermodynamic description in the vicinity of critical points.<br>We use this approach to compute vapor-liquid equilibrium of pure components and binary mixtures, as well as derivative properties such as speed of sound and heat capacity.<br>Our results show that this methodology is able to provide an equation of state with the correct non-classical behavior, thus bringing it in consonance with experimental observation of vapor-liquid equilibrium and derivative properties in near-critical conditions.

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Renormalization group corrections to the modified perturbed hard sphere chain equation of state for vapor liquid equilibria and interfacial tension of pure and binary mixtures

Cited by 10 publications

References 74 publications

Effects of Temperature and Pressure on Interfacial Tensions of Fluid Mixtures. II. Propane/n-Pentane and Propane/n-Hexane Binaries

Effects of Temperature and Pressure on Interfacial Tensions of Fluid Mixtures. II. Propane/n-Pentane and Propane/n-Hexane Binaries

Phase equilibria and surface tension in castor oil‐based polyols‐water–methanol mixture: Thermodynamic basis

Renormalization Group Theory Applied to the CPA Equation of State: Impacts on Phase Equilibrium and Derivative Properties

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