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Reactive ionic liquid media for the separation of propylene/propane gaseous mixtures

Abstract: Designed room temperature ionic liquids (RTILs) containing silver salt are presented as reactive media in separating propylene/propane gas mixtures. Solubilities of propylene and propane in the reactive media, silver tetrafluoroborate (AgBF4) dissolved in 1-butyl-3-methylimidazolium tetrafluoroborate (BmimBF4) and N-butyl-4-methylpyridinium tetrafluoroborate (BmpyBF4), were investigated as a function of silver ion concentration, temperature, and pressure. Equilibrium data were obtained working in a temperature range between 278 and 318 K and at pressures up to 6 bar. Propylene absorption was chemically enhanced in the silver-based RTILs and was considerably higher than that in the standard RTILs. Absorption of propane in the silver-based RTILs is based on physical interactions only. A simple mathematical model based on the formation of complex species with different stoichiometry has been developed in order to describe the total propylene absorption, and the model was validated with experimental data obtained working with different concentrations of silver salt (between 0.1 and 1 M). The model parameters, equilibrium constants (KEq,1f(T) and KEq,2f(T)), and enthalpies of complexation (AHr,1, AHr,2) were obtained. Thermal stability of the silver ions was analyzed and to be found dependent on the silver salt concentration. Complete regeneration of the reaction media was possible at a temperature of 313 K and 20 mbar of pressure.

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 Autoría: Ortiz A., Galán Sanchez L., Gorri D., De Haan A., Ortiz I.,

 Fuente: Industrial and Engineering Chemistry Research, 2010, 49(16), 7227-7233

Editorial: American Chemical Society

 Fecha de publicación: 09/07/2010

Nº de páginas: 7

Tipo de publicación: Artículo de Revista

 DOI: 10.1021/ie100576r

ISSN: 0888-5885,1520-5045

Proyecto español: CTQ2008-00690

Url de la publicación: https://doi.org/10.1021/ie100576r