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Low-Viscosity Triethylbutylammonium Acetate as a Task-Specific Ionic Liquid for Reversible CO2 Absorption

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Separation Engineering Research Center, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P. R. China
*E-mail: [email protected]; [email protected]. Phone: +86-25-83593772. Fax: +86-25-83593772.
Cite this: J. Chem. Eng. Data 2011, 56, 4, 1125–1133
Publication Date (Web):March 7, 2011
Copyright © 2011 American Chemical Society

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    Capturing and storing carbon dioxide (CO2) is now of concern. This work presents a task-specific ionic liquid (TSIL), triethylbutylammonium acetate ([N2224][CH3COO]), for the purpose of trapping CO2 instead of the commonly used organic amine solutions. Since [N2224][CH3COO] has a hydrophilic nature, the CO2 dissolution behavior into [N2224][CH3COO]−nH2O complexes has been investigated in detail, including the absorption rate, absorption capacity, and the ability of repeating absorption. The solubilities of CO2 into [N2224][CH3COO]−1H2O at 0 °C, 25 °C, 40 °C, and 60 °C from (0.007 up to 30) bar are presented. The results show strong evidence that [N2224][CH3COO]−1H2O is an excellent reversible absorbent for CO2, and the recovered [N2224][CH3COO]−1H2O maintains the same absorption capacity and absorption rate. The CO2 absorption into [N2224][CH3COO]−nH2O mixtures at 25 °C and pressures up to 30 bar is also studied. It is elucidated that the absorption capacity decreases with the content of water and the rise of operational temperature. The equilibrium constant, Henry’s law constant, overall rate constant, and activation energy are also calculated from the experimental data. All evidence indicates that [N2224][CH3COO]−nH2O with low viscosity may have potential to be used as good absorbents for CO2 capture.

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