resumo
New standards concerning environmental and safety issues are creating an increasing interest on ionic liquids as alternative solvents for a wide range of industrial applications. In this work, a new apparatus developed to measure vapor-liquid phase equilibrium in a wide range of pressures and temperatures was used to measure the phase behavior of the binary systems of carbon dioxide (CO(2))+1-ethyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide ([C(2) mim][Tf(2)N]) and CO(2)+1-methyl-3-pentyl-imidazolium bis(trifluoromethylsulfonyl)imide ([C(5) mim][Tf(2)N]) at temperatures up to 363 K and pressures up to 50 MPa. A thermodynamic consistency test, developed for systems with incomplete PTxy data and based on the Gibbs-Duhem equation, was applied to the experimental data measured in this work and the Peng-Robinson EoS using the Wong-Sandler mixing rule was used to describe the experimental data with excellent results. (C) 2008 Elsevier B.V. All rights reserved.
palavras-chave
GAS SOLUBILITY; THERMODYNAMIC PROPERTIES; MUTUAL SOLUBILITIES; ELEVATED PRESSURES; SURFACE TENSIONS; MOLTEN-SALTS; CO2; SYSTEMS; TEMPERATURE; WATER
categoria
Chemistry; Engineering
autores
Carvalho, PJ; Alvarez, VH; Machado, JJB; Pauly, J; Daridon, JL; Marrucho, IM; Aznar, M; Coutinho, JAP
nossos autores
Isabel Maria Delgado Jana Marrucho Ferreira
Professor Catedrático
Pedro J. Carvalho
Professor Auxiliaragradecimentos
The authors are thankful for financial support from Fundacao para a Ciencia e a Tecnologia (Project POCI/EQU/58152/2004) and Ph.D. grant (SFRH/BD/41562/2007) of Pedroj. Carvalho. The authors would like to acknowledge FAPESP (Fundacao de Amparo a Pesquisa do Estado de SAO Paulo), process # 2006/03711-1.