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Thermophysical properties and CO2 absorption of ammonium-based protic ionic liquids containing acetate and butyrate anions
Ionic liquids, which are classified as new solvents, have been identified to be potential solvents in the application of CO2 capture. In this work, six ammonium-based protic ionic liquids, containing ethanolammonium EtOHA, tributylammonium TBA, bis(2-ethylhexyl)ammonium BEHA cations, and acetate AC and butyrate BA anions, were synthesized and characterized. The thermophysical properties of the ammonium-based protic ionic liquids were measured. Density, Ï�, and dynamic viscosity, Î·, were determined at temperatures between 293.15 K and 363.15 K. The density and viscosity values were correlated using empirical correlations and the thermal coefficient expansion, Î±p, and molecular volume, Vm, were estimated using density values. The thermal stability of the ammonium-based protic ionic liquids was investigated using thermogravimetric analyzer (TGA) at a heating rate of 10 °CÂ·min-1 The CO2 absorption of the ammonium-based ionic liquids were measured up to 20 bar at 298.15 K. From the experimental results, BEHABA had the highest affinity towards CO2 with the mol fraction of CO2 absorbed approaching 0.5 at 20 bar. Generally, ionic liquids with butyrate anions have better CO2 absorption than that of acetate anions while BEHA ionic liquids have higher affinity towards CO2 followed by TBA and EtOHA ionic liquids. © 2019 by the authors.
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