Testing the ability of various equations of state to reproduce high-pressure isotherm crossings in the (α, P) plane

Privat, Romain; Gaillochet, François; Jaubert, Jean‐Noël

doi:10.1016/j.fluid.2012.05.008

Cited by 9 publications

(3 citation statements)

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“…There is no unique crossing point; in fact, there is a range of pressures where isotherms cross to each other, as shown in panel (c) of Figures 4−6. This behavior agrees with the study reported previously by Privat et al, 35 and it has been explained in the literature 33,36 as an effect of pressure on the shape of the effective intermolecular potential, where the liquid system passes from the domain of fluctuations at low pressures to the domain of the short-range repulsive forces at high pressures.…”

Section: Resultssupporting

confidence: 93%

P–ρ–TData and Derivative Properties of 3-Methylpentane, 2,4-Dimethylpentane, and 2,3,4-Trimethylpentane from 283.15 to 363.15 K at Pressures up to 65 MPa

2019

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In this work, we present densities at high pressures of three branched hydrocarbons: 3-methylpentane, 2,4-dimethylpentane, and 2,3,4trimethylpentane from 283.15 to 363.15 K and at pressures up to 65 MPa. We have used a vibrating tube densimeter along with the forced path calibration method. This method considers mechanical properties of the cell and allows us to reach standard uncertainties less than 0.0004 g•cm 3 . For 3methylpentane, the new density data agree within 0.2% with densities from the literature. For the case of 2,4-dimethylpentane and 2,3,4-trimethylpentane, densities at high pressures have not been reported in the literature. Isobaric expansibility and isothermal compressibility are calculated using an equation of state correlated to the experimental density data.

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Section: Resultssupporting

confidence: 93%

P–ρ–TData and Derivative Properties of 3-Methylpentane, 2,4-Dimethylpentane, and 2,3,4-Trimethylpentane from 283.15 to 363.15 K at Pressures up to 65 MPa

2019

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“…the quantity λ = b/v c (root of Eq. ) can be obtained directly by solving Eq. :

λ = {(\sqrt[3]{(1 + r_{1}) {((), 1 + r_{2})}^{2}} + \sqrt[3]{(1 + r_{2}) {((), 1 + r_{1})}^{2}} + 1)}^{- 1}

…”

Section: Discussionmentioning

confidence: 99%

Comments on “Understanding cubic equations of state: A search for the hidden clues of their success”

Heidaryan

2018

AIChE Journal

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“…Because of the complicated phase behavior resulting from complex molecular interactions, such a study is not an easy task and beyond the scope of the current work. Models need to have a good fundamental backbone to be able to describe the observed phenomena, and cubic equations of state are unable to capture the complexities of the alcohol multimers and their impact on phase behavior. ,, Secuianu and co-workers, ,,, and well as the group of Jaubert and Privat − among others, have recently been making strides toward thermodynamic comprehension of these type of systems. However, implementation of these more complex models is not straightforward.…”

Section: Discussionmentioning

confidence: 99%

High Pressure Phase Behavior of the Homologous Series CO₂ + 1-Alcohols

Schwarz

2018

J. Chem. Eng. Data

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The phase behavior of the supercritical CO 2 + 1-alcohol homologous series for 1-octanol and higher alcohols is investigated. A literature survey revealed that sufficient data are available lower alcohols (1-decanol and lower) but data are limited for higher 1-alcohols. Data for CO 2 + 1-dodecanol, CO 2 + 1-tetradecanol, and CO 2 +1-hexadecanol were thus measured using a visual static synthetic method for T = 313− 353 K. Measured and literature data indicated that the phase transition pressures are very high (>28 MPa) for CO 2 + 1decanol and higher alcohols in the mixture critical region. Additionally, a temperature inversion (increasing temperature leading to decreasing phase transition pressure) is present in the mixture critical region and is more pronounced in systems containing higher 1-alcohols. The temperature inversion is postulated to result from the formation of alcohol multimers due to hydrogen bonding between alcohol molecules. From the phase behavior data as well as published upper critical end point and solid−liquid−liquid−vapor equilibria data, Type III phase behavior according to the classification of Scott and van Konynenburg is assigned to the systems CO 2 + 1-octanol to CO 2 + 1tetradecanol. However, for higher alcohols additional investigations are required to assign a phase behavior type. This systematic study hopes to aid future thermodynamic modeling attempts to describe the complex phase behavior of CO 2 + 1-alcohol systems.

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Testing the ability of various equations of state to reproduce high-pressure isotherm crossings in the (α, P) plane

Cited by 9 publications

References 30 publications

P–ρ–TData and Derivative Properties of 3-Methylpentane, 2,4-Dimethylpentane, and 2,3,4-Trimethylpentane from 283.15 to 363.15 K at Pressures up to 65 MPa

P–ρ–TData and Derivative Properties of 3-Methylpentane, 2,4-Dimethylpentane, and 2,3,4-Trimethylpentane from 283.15 to 363.15 K at Pressures up to 65 MPa

Comments on “Understanding cubic equations of state: A search for the hidden clues of their success”

High Pressure Phase Behavior of the Homologous Series CO₂ + 1-Alcohols

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Testing the ability of various equations of state to reproduce high-pressure isotherm crossings in the (α, P) plane

Cited by 9 publications

References 30 publications

P–ρ–TData and Derivative Properties of 3-Methylpentane, 2,4-Dimethylpentane, and 2,3,4-Trimethylpentane from 283.15 to 363.15 K at Pressures up to 65 MPa

P–ρ–TData and Derivative Properties of 3-Methylpentane, 2,4-Dimethylpentane, and 2,3,4-Trimethylpentane from 283.15 to 363.15 K at Pressures up to 65 MPa

Comments on “Understanding cubic equations of state: A search for the hidden clues of their success”

High Pressure Phase Behavior of the Homologous Series CO2 + 1-Alcohols

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High Pressure Phase Behavior of the Homologous Series CO₂ + 1-Alcohols