Design and Evaluation of Ionic Liquids as Novel CO2 Absorbents Page: 3 of 16
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Abstract
Progress from the fourth quarter 2005 activity on the project "Design and Evaluation of
Ionic Liquids as Novel CO2 Absorbents" is provided. Major activities in three areas are
reported: compound synthesis, property measurement and molecular modeling. Two new
ionic liquids have been synthesized (1-n-hexy-3-methylimidazolium saccharinate and
1-n-hexy-3-methylimidazolium acesulfumate). Densities and viscosities have been
measured for these compounds. A new apparatus for measuring SO2 solubility in ionic
liquids was installed, tested and validated. Using this new apparatus, we carried out the
first ever measurements of SO2 solubility in an ionic liquid. It was determined that SO2 is
remarkably soluble in the ionic liquid 1-n-hexyl-3-methylimidazolium
bis(trifluoromethanesulfonyl)imide. We believe this is a general phenomenon and that
other ionic liquids will show similar high solubilities. CO2 and N2 solubilities as well as
thermal decomposition temperatures were measured in the recently synthesized 1-n-
hexy-3-methylimidazolium lactate ionic liquid. This ionic liquid shows some of the
highest CO2 solubility of any ionic liquid we have tested. It was found, however, that
thermal stability may be an issue above 100 C. To make a better comparison of the
performance of the ionic liquids, we have used DOE baseline data for CO2 absorption to
compute a relative CO2 carrying capacity of the ionic liquids versus MEA. We show that
the initial ionic liquids studied likely have too low a capacity to be economically viable,
but the new lactate compound is approaching the capacity required. We validated the
molecular modeling code for computing absorption isotherms and have results for CO2
absorption in the ionic liquid 1-n-butyl-3-methylimidazolium hexafluorophosphate.
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Maginn, Edward J. Design and Evaluation of Ionic Liquids as Novel CO2 Absorbents, report, November 20, 2005; United States. (https://digital.library.unt.edu/ark:/67531/metadc874117/m1/3/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.