291352 Experimental Characterization of Functionalized Alkylimidazoles As Solvents for CO2 Capture

Monday, October 29, 2012
Hall B (Convention Center )
Joshua Moon1, Kristopher Reclusado2, Matthew S. Shannon1, A. Christopher Irvin1, Alexander Stanton1, Michelle S. Hindman1 and Jason E. Bara1, (1)Chemical & Biological Engineering, University of Alabama, Tuscaloosa, AL, (2)Chemical Engineering, Villanova University, Villanova, PA

Previous work has characterized specific physical properties and CO2 solubility of 1-n-alkylimidazole solvents for use in pre- and post-combustion CO2 capture during gas treating.  This research project explores the CO2 solubility and physical properties of functionalized alkylimidazole solvents to determine the effects of functional group position(s) on various chemical and physical attributes.  Using this information, additional correlations between ring substitution and physical properties can be derived to optimize the characteristics best suited for larger-scale pilot testing in industrial applications.  Synthesis and purification of these compounds were followed by tests to determine empirical equations concerning density, viscosity, and vapor pressure as functions of temperature and ring substitution, and these properties were shown to be comparable to previously-tested 1-n-alkylimidazoles.  The solvents in general were found to have low viscosities (<15 cp) and negligible vapor pressures (<0.5 mbar).  CO2 solubility experiments also showed that functionalized alkylimidazoles have similar if not improved absorption capacities relative to ionic liquids and 1-n-alkylimidazoles.

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