High-pressure phase equilibrium measurements and thermodynamic modeling for the systems involving CO2, ethyl esters (oleate, stearate, palmitate) and acetone

Brandalize, Marcus V.; Gaschi, Priscilla S.; Mafra, Marcos R.; Ramos, Luiz Pereira; Corazza, Marcos L.

doi:10.1016/j.cherd.2014.04.028

Cited by 12 publications

(11 citation statements)

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“…However, while no three phase regions were observed, it may be that they are present in these systems, only at composition−temperature conditions not considered in this work. Brandalize et al 2 and Gaschi et al 5 observed liquid−liquid immiscibility and vapor−liquid−liquid equilibria at temperatures close to the critical point of CO 2 for the systems CO 2 /ethyl hexadecanoate and CO 2 /ethyl octadecanoate.…”

Section: Resultsmentioning

confidence: 98%

“…Figure 4. Comparison of experimental phase transition pressure (P) as a function of ethyl ester mass fraction (w EE ) for CO 2 /ethyl esters system from ethyl octanoate to ethyl octadecanoate at (a) 318.2 K, (b) 333.2 K, and (c) 348.2 K (key × = C8EE, ○ = C10EE, △ = C12EE, □ = C14EE, ◊ = C16EE, + = C18EE; CO 2 /ethyl octanoate data from Hwu et al6 and CO 2 /ethyl octadecanoate data from Bharath et al,1 Brandalize et al,2 and Crampon et al4 ).…”

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confidence: 99%

“…• Ethyl octadecanoate (ethyl stearate, C18EE): Bharath et al,1 Brandalize et al,2 (from the same group at Gaschi et al5 ) and Crampon et al4 all measured phase behavior data for the system CO 2 /ethyl octadecanoate. Bharath et al and Crampon et al measured data at 313.2, 323.2, and 333.2 K, while Brandalize et al covered the range 303.2 to 353.2 K in 10 K increments.…”

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confidence: 99%

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High Pressure Phase Equilibria of the CO₂/Saturated Ethyl Esters Homologous Series

Schwarz¹

2018

J. Chem. Eng. Data

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A systematic study on the phase behavior of saturated ethyl esters with supercritical CO2 is presented. High pressure phase behavior measurements for the systems CO2/ethyl decanoate, CO2/ethyl dodecanoate, CO2/ethyl tetradecanoate, and CO2/ethyl hexadecanoate were conducted in a static synthetic view cell in the temperature range 308–358 K. Phase transition pressures were measured in the range 5.86–23.01 MPa for ethyl ester mass fractions in the range 0.0174–0.657 and complement existing literature data. Throughout the temperature and compositional range measured, which encompassed the liquid phase, mixture critical region, and vapor phase, an increase in temperature leads to an increase in phase transition pressure with no temperature inversions or three phase regions observed. Additionally, an increase in hydrocarbon backbone length leads to an ever-increasing phase-transition pressure, suggesting fractionation of ethyl esters according to molecular mass with supercritical CO2 is possible. Finally, the measured and previously published CO2/ethyl ester data were successfully correlated with a modified Chrastil models and the MT model. While these models cannot easily be used predictively and depend on the data sets used for correlation, these are simple and easy methods that can be used to interpolate data.

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Section: Resultsmentioning

confidence: 98%

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confidence: 99%

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High Pressure Phase Equilibria of the CO₂/Saturated Ethyl Esters Homologous Series

Schwarz¹

2018

J. Chem. Eng. Data

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“…Since sizes, structures, and intermolecular forces of components in a mixture are not significantly different, a conventional cubic equation of state can be used for the evaluation of the phase behavior of highpressure systems. Among cubic equations, the Peng-Robinson and Soave-Redlich-Kowang equations of state are widely used for determining high-pressure phase equilibria (Stevens et al, 1997;Adrian et al, 1998;Liao et al, 2010;Hou et al, 2012;Brandalize et al, 2014;Machida et al, 2014;Pereira et al, 2014). In addition to the cubic equations of state, CPA and GC equations of state are also used to predict thermodynamic properties and high-pressure phase behavior of fluids (Espinosa et al, 2002;Fernández-Ronco et al, 2010;Keshtkari et al, 2013;Masoodiyeh et al, 2013).…”

Section: Vapor-liquid Equilibriummentioning

confidence: 99%

Study of Solubility in Supercritical Fluids: Thermodynamic Concepts and Measurement Methods - A Review

Rad

Karimi-Sabet

Varaminian

2019

Braz. J. Chem. Eng.

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Due to the importance of supercritical fluid technology (SFT) in different industries, it has been the subject of intense research in recent decades. Solubility is a key concept in SFT. In fact, obtaining knowledge about the theoretical concepts of solubility and related experimental measurement methods can be useful in developing and improving the quality of research in this field. This study reviews the fundamental knowledge of solubility in supercritical fluids and investigates the significant topics in this field, including high-pressure phase behavior, experimental measurement methods, modeling, and molecular simulation of solubility.

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“…The experimental apparatus and procedure used in this work were presented and described in previous publications [13][14][15][16][17]. Briefly, the experimental data measurements were performed in a high-pressure variable-volume view cell containing a movable piston, which allows the pressure control inside the cell.…”

Section: Apparatus and Experimental Proceduresmentioning

confidence: 99%

Phase equilibrium measurements and thermodynamic modeling of {CO2 + diethyl succinate + cosolvent} systems

Petza

Grilla

Capeletto

et al. 2019

Fluid Phase Equilibria

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This work reports experimental phase equilibrium data for the binary systems {CO2(1) + diethyl succinate(2)} and {CO2(1) + ethyl acetate(2)}, and for the ternary systems {CO2(1) + diethyl succinate(2) + ethanol(3)} and {CO2(1) + diethyl succinate(2) + ethyl acetate(3)}.The experiments for the binary system {CO2(1) + diethyl succinate(2)} were carried out at temperatures ranging from 308 K to 358 K, and temperatures ranging from 303 K to 343 K for {CO2(1) + ethyl acetate(2)} as well as for all ternary systems. Only vapor-liquid equilibria were observed for all systems. The experimental measurements were carried out in a high-pressure variable-volume view cell containing a movable piston, which allows pressure control inside the cell. Binary and ternary systems were modeled with the Peng-Robinson cubic equation of state with the van der Waals quadratic mixing rule (vdW2).The presence of a cosolvent (ethanol and ethyl acetate) decreased the saturation pressures of either bubble or dew points compared to the binary system CO2 + diethyl succinate, increasing the solubility of diethyl succinate in CO2.

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High-pressure phase equilibrium measurements and thermodynamic modeling for the systems involving CO2, ethyl esters (oleate, stearate, palmitate) and acetone

Cited by 12 publications

References 48 publications

High Pressure Phase Equilibria of the CO₂/Saturated Ethyl Esters Homologous Series

High Pressure Phase Equilibria of the CO₂/Saturated Ethyl Esters Homologous Series

Study of Solubility in Supercritical Fluids: Thermodynamic Concepts and Measurement Methods - A Review

Phase equilibrium measurements and thermodynamic modeling of {CO2 + diethyl succinate + cosolvent} systems

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High-pressure phase equilibrium measurements and thermodynamic modeling for the systems involving CO2, ethyl esters (oleate, stearate, palmitate) and acetone

Cited by 12 publications

References 48 publications

High Pressure Phase Equilibria of the CO2/Saturated Ethyl Esters Homologous Series

High Pressure Phase Equilibria of the CO2/Saturated Ethyl Esters Homologous Series

Study of Solubility in Supercritical Fluids: Thermodynamic Concepts and Measurement Methods - A Review

Phase equilibrium measurements and thermodynamic modeling of {CO2 + diethyl succinate + cosolvent} systems

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Product

Resources

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High Pressure Phase Equilibria of the CO₂/Saturated Ethyl Esters Homologous Series

High Pressure Phase Equilibria of the CO₂/Saturated Ethyl Esters Homologous Series