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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.
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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