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HIGH PRESSURE PHASE EQUILIBRIUM: PREDICTION OF ESSENTIAL OIL SOLUBILITY Ciênc. Tecnol. Aliment.
CARDOZO-FILHO,Lúcio; WOLFF,Fred; MEIRELES,M. Angela A..
This work describes a method to predict the solubility of essential oils in supercritical carbon dioxide. The method is based on the formulation proposed in 1979 by Asselineau, Bogdanic and Vidal. The Peng-Robinson and Soave-Redlich-Kwong cubic equations of state were used with the van der Waals mixing rules with two interaction parameters. Method validation was accomplished calculating orange essential oil solubility in pressurized carbon dioxide. The solubility of orange essential oil in carbon dioxide calculated at 308.15 K for pressures of 50 to 70 bar varied from 1.7<FONT FACE="Symbol">±</font> 0.1 to 3.6<FONT FACE="Symbol">±</font> 0.1 mg/g. For same the range of conditions, experimental solubility varied from 1.7<FONT...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Essential oil; Phase equilibria; Supercritical extraction; Peng-Robinson; Soave-Redlich-Kwong.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20611997000400027
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Phase Equilibria of the CH4-CO2 Binary and the CH4-CO2-H2O Ternary Mixtures in the Presence of a CO2-Rich Liquid Phase ArchiMer
Legoix, Ludovic; Ruffine, Livio; Donval, Jean-pierre; Haeckel, Matthias.
The knowledge of the phase behavior of carbon dioxide (CO2)-rich mixtures is a key factor to understand the chemistry and migration of natural volcanic CO2 seeps in the marine environment, as well as to develop engineering processes for CO2 sequestration coupled to methane (CH4) production from gas hydrate deposits. In both cases, it is important to gain insights into the interactions of the CO2-rich phase—liquid or gas—with the aqueous medium (H2O) in the pore space below the seafloor or in the ocean. Thus, the CH4-CO2 binary and CH4-CO2-H2O ternary mixtures were investigated at relevant pressure and temperature conditions. The solubility of CH4 in liquid CO2 (vapor-liquid equilibrium) was determined in laboratory experiments and then modelled with the...
Tipo: Text Palavras-chave: Gas hydrate; CH4; CO2-rich mixtures; Phase equilibria; Soave-Redlich-Kwong (SRK) cubic equation of state (EoS).
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00414/52538/53349.pdf
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THE GENERALIZED MAXIMUM LIKELIHOOD METHOD APPLIED TO HIGH PRESSURE PHASE EQUILIBRIUM Ciênc. Tecnol. Aliment.
CARDOZO-FILHO,Lúcio; STRAGEVITCH,Luiz; WOLFF,Fred; MEIRELES,M. Angela A..
The generalized maximum likelihood method was used to determine binary interaction parameters between carbon dioxide and components of orange essential oil. Vapor-liquid equilibrium was modeled with Peng-Robinson and Soave-Redlich-Kwong equations, using a methodology proposed in 1979 by Asselineau, Bogdanic and Vidal. Experimental vapor-liquid equilibrium data on binary mixtures formed with carbon dioxide and compounds usually found in orange essential oil were used to test the model. These systems were chosen to demonstrate that the maximum likelihood method produces binary interaction parameters for cubic equations of state capable of satisfactorily describing phase equilibrium, even for a binary such as ethanol/CO2. Results corroborate that the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phase equilibria; Supercritical extraction; Peng-Robinson; Soave-Redlich-Kwong.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20611997000400026
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