Online citations, reference lists, and bibliographies.
← Back to Search

Excess Molar Enthalpies For Mixtures Of Supercritical CO2 And Ethyl Acetate And Their Role In Supercritical Fluid Applications

F. Zahran, C. Pando, J. A. R. Renuncio, A. Cabañas
Published 2012 · Chemistry

Save to my Library
Download PDF
Analyze on Scholarcy
Abstract Mixtures of supercritical CO2 and ethyl acetate (EA) are very often involved in supercritical fluid applications and their thermodynamic properties are required to understand and design these processes. Excess molar enthalpies ( H m E ) for (CO2 + EA) mixtures were measured using an isothermal high-pressure flow calorimeter under conditions of temperature and pressure typically used in supercritical processes: pressures from (9.00 to 18.00) MPa and temperatures from (313.15 to 333.15) K. Mixtures showed exothermic mixing; excess molar enthalpies exhibited a minimum in the CO2-rich region. The effects of pressure and temperature on the excess molar enthalpy of (CO2 + EA) are large. The most exothermic H m E values were observed for a coincident CO2 mole fraction value of 0.737 at T/K = (323.15 and 333.15) and P/MPa = 9.00: (−4489 and −4407) J · mol−1, respectively. Two-phase splitting was observed in the CO2-rich region at T/K = 333.15 and P/MPa = 9.00; in this region H m E varies linearly with CO2 mole fraction. For a given mole fraction and temperature, mixtures become more exothermic as pressure decreases. These trends were analyzed in terms of molecular interactions, phase equilibria, density and critical parameters previously reported for (CO2 + EA). Excess molar enthalpies here reported were correlated using the Soave–Redlich–Kwong and Peng–Robinson equations of state, and the classical mixing rule with two binary interaction parameters. The influence of the thermal effects on the phase behavior of (CO2 + EA) mixtures formed in supercritical antisolvent precipitation experiments was discussed.
This paper references
Radical polymerization in supercritical carbon dioxide—use of supercritical carbon dioxide as a mixing assistant
K. Nishi (2005)
CO(2)-expanded solvents: unique and versatile media for performing homogeneous catalytic oxidations.
M. Wei (2002)
Piroxicam solid state studies after processing with SAS technique
N. D. Zordi (2010)
Role of excess molar enthalpies in supercritical antisolvent micronizations using dimethylsulfoxide as the polar solvent
F. Zahran (2011)
The influence of phase behavior on the morphology of protein α-chymotrypsin prepared via a supercritical anti-solvent process
Shan-Chun Chang (2008)
Isothermal high pressure flow calorimeter
J. Christensen (1976)
A New Two-Constant Equation of State
D. Peng (1976)
Kinetically Driven Crystallization of a Pure Polymorphic Phase of Stearic Acid from CO2-Expanded Solutions
S. Sala (2010)
Volumetric behavior of ethyl acetate, ethyl octanoate, ethyl laurate, ethyl linoleate, and fish oil ethyl esters in the presence of supercritical CO2
R. Smith (1998)
Precipitation of lutein and co-precipitation of lutein and poly-lactic acid with the supercritical anti-solvent process
Fernando Miguel (2008)
Role of Phase Behavior and Atomization in the Supercritical Antisolvent Precipitation
E. Reverchon (2003)
Vapour-liquid equilibrium in the carbon dioxide—ethyl acetate system at high pressure
Z. Wagner (1994)
Vapor−Liquid Equilibria of the Carbon Dioxide + Ethyl Propanoate and Carbon Dioxide + Ethyl Acetate Systems at Pressure from 2.96 MPa to 11.79 MPa and Temperature from 313 K to 393 K
Yiling Tian (2004)
Excess enthalpies of (ethanol+water) at 323.15, 333.15, 348.15, and 373.15 K and from 0.4 to 15 MPa
J. Ott (1986)
Measurements and modeling of high-pressure excess molar enthalpies and isothermal vapor–liquid equilibria of the carbon dioxide + N,N-dimethylformamide system
F. Zahran (2010)
E. Reverchon (1999)
Interactions of phase equilibria, jet fluid dynamics and mass transfer during supercritical antisolvent micronization
E. Reverchon (2010)
Volume expansions and vapor-liquid equilibria of binary mixtures of a variety of polar solvents and certain near-critical solvents
A. Kordikowski (1995)
Excess Molar Enthalpies of CO2 + Acetone at Pressures from (9.00 to 18.00) MPa and Temperatures from (313.15 to 333.15) K
F. Zahran (2010)
High-Pressure Vapor−Liquid Equilibrium Data for Systems Involving Carbon Dioxide + Organic Solvent + β-Carotene
G. Borges (2007)
Static properties of solutions. Van der Waals and related models for hydrocarbon mixtures
R. Scott (1970)
High-pressure phase behavior and modeling of binary mixtures for alkyl acetate in supercritical carbon dioxide
H. Byun (2006)
Solvent effect on tolbutamide crystallization induced by compressed CO2 as antisolvent
P. Subra-Paternault (2007)
Micronization processes with supercritical fluids: fundamentals and mechanisms.
A. Martín (2008)
Nanoparticles production by supercritical antisolvent precipitation: A general interpretation
E. Reverchon (2007)
Volumetric Behavior and Saturated Pressure for Carbon Dioxide + Ethyl Acetate at a Temperature of 313.15 K
M. Kato (2006)
Precipitation of sub-micron particles of 3,5-diprenyl-4-hydroxycinnamic acid in Brazilian propolis from supercritical carbon dioxide anti-solvent solutions
Chao-Rui Chen (2009)
A New Equation of State for Carbon Dioxide Covering the Fluid Region from the Triple‐Point Temperature to 1100 K at Pressures up to 800 MPa
R. Span (1996)
Phase equilibria for enzyme-catalyzed reactions in supercritical carbon dioxide
A. Chrisochoou (1995)
Equilibrium constants from a modified Redlich-Kwong equation of state
G. Soave (1972)
Excess molar enthalpies for binary mixtures related to supercritical antisolvent precipitation: Carbon dioxide + N-methyl-2-pyrrolidone
M. J. Dávila (2007)
High pressure phase equilibrium data for the systems carbon dioxide/ethyl acetate and carbon dioxide/isoamyl acetate at 295.2, 303.2 and 313.2 K
M. V. D. Silva (2000)
Role of phase behavior in micronization of lysozyme via a supercritical anti-solvent process
Shan-Chun Chang (2008)
Analysis of volume expansion mechanism of CO2–acetate systems at 40 °C
T. Aida (2010)
Recent developments in particle design using supercritical fluids
A. Shariati (2003)

This paper is referenced by
Semantic Scholar Logo Some data provided by SemanticScholar