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Type: Artigo de periódico
Title: A Three-phase Ternary Model For Co2-solid-liquid Equilibrium At Moderate Pressures
Author: Da Rocha S.R.P.
De Oliveira J.V.
D'Avila S.G.
Abstract: In this work, we present a simple, totally predictive, three-phase modeling for systems containing CO2-solid-liquid for evaluation of cosolvents in the supercritical-fluid extraction (SCFE) of volatile matter of Brazilian mineral coals. The liquid phase is modeled by the traditional regular solution theory while the gas phase is represented by the Peng-Robinson/Stryjek-Vera equation of state and the heavy component is taken as a pure solid. In the liquid phase, supercritical CO2 is considered a hypothetical liquid, its standard fugacity being given by a specific correlation. The results of the solid-liquid-gas equilibrium calculations are in good agreement with experimental data of the mixture CO2-naphthalene-toluene1 at moderate pressures although no adjustable parameters were used. When a liquid phase is present, the results of the simulations involving the mixtures CO2-naphthalene-toluene and CO2-naphthalene-n-pentane indicate higher concentrations of naphthalene in the gas phase when the cosolvent is n-pentane. These results show that both the solid-cosolvent interactions and the volatility of the cosolvent should be taken into account.
Rights: fechado
Identifier DOI: 
Date Issue: 1996
Appears in Collections:Unicamp - Artigos e Outros Documentos

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