Design and Evaluation of Ionic Liquids as Novel CO2 Absorbents Page: 3 of 12
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Progress from the third quarter 2006 activity on the project "Design and Evaluation of
Ionic Liquids as Novel CO2 Absorbents" is provided. Major activities in two areas are
reported: property measurement and molecular modeling.
We have measured CO2 solubility in an ammonium lactate ionic liquid. Previous work
has shown that the lactate anion enables chemical complexation to occur. We
hypothesized that the lactate anion would not be as effective in complexing when paired
with an ammonium cation as compared to when it is paired with an imidazolium cation.
The results confirm this. We also measured CO2 solubility in a functionalized ionic liquid
containing an amine group. These so-called task specific ionic liquids (TSILs) are
expected to have dramatically higher CO2 solubility than physical absorbents. We report
isotherms as well as entropies and enthalpies of absorption for CO2 in one TSIL. CO2
solubilities are higher in this compound than in any previous IL we have observed.
Finally, we also developed a new simulation method that will enable us to compute full
isotherms of gases in ionic liquids. So far, we have tested the method against model
systems and found it to be highly effective.
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Maginn, Edward J. Design and Evaluation of Ionic Liquids as Novel CO2 Absorbents, report, September 30, 2006; United States. (https://digital.library.unt.edu/ark:/67531/metadc878716/m1/3/?rotate=270: accessed May 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.