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metadata.dc.type: | Artigo de Periódico Artigo de Periódico |
Title: | Isobaric (vapor + liquid) equilibria of 1-ethyl-3-methylimidazolium ethylsulfate plus (propionaldehyde or valeraldehyde): Experimental data and prediction |
Other Titles: | Journal of Chemical Thermodynamics |
Authors: | Alvarez, Víctor H. Silva, Silvana Mattedi e Aznar, Martin |
metadata.dc.creator: | Alvarez, Víctor H. Silva, Silvana Mattedi e Aznar, Martin |
Abstract: | This paper reports the density, refraction index, and (vapor + liquid) equilibria (VLE) for binary systems {aldehyde + 1-ethyl-3-methylimidazolium ethylsulfate ([emim][EtSO4])}: {propionaldehyde + [emim]- [EtSO4]} and {valeraldehyde + [emim][EtSO4]}. The uncertainties for the temperature, pressure, and compositions measurements for the phase equilibria are ±0.1 K, ±0.01 kPa and ±0.0004, respectively. A qualitative analysis of the variation of the properties with changes in solvent and temperature was per- formed. The Peng–Robinson equation of state (PR EoS), coupled with the Wong–Sandler mixing rule (WS), is used to describe the experimental data. To calculate activity coefficients we used three different models: NRTL, UNIQUAC, and COSMO-SAC. Since the predictive liquid activity coefficient model COSMO-SAC is used in the Wong–Sandler mixing rule, the resulting thermodynamic model is a completely predictive one. The prediction results for the density and for the (vapor + liquid) equilibria have a deviation lower than 2.3% and 1.6%, respectively. The (vapor + liquid) equilibria predictions show a good description for the propionaldehyde system and only a qualitative description for the valeraldehyde system. |
Keywords: | (Vapor + liquid) equilibria Protic ionic liquid COSMO-SAC Molecular interactions |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/5337 |
Issue Date: | 2011 |
Appears in Collections: | Artigo Publicado em Periódico (PEI) |
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