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

详细信息    查看全文

• 作者：Guannan Wang ; Wenlong Hou ; Feng Xiao ; Jiao Geng ; Youting Wu ; Zhibing Zhang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2011
• 出版时间：April 14, 2011
• 年：2011
• 卷：56
• 期：4
• 页码：1125-1133
• 全文大小：869K
• 年卷期：v.56,no.4(April 14, 2011)
• ISSN：1520-5134

文摘

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]鈭?i>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]鈭?H₂O at 0 掳C, 25 掳C, 40 掳C, and 60 掳C from (0.007 up to 30) bar are presented. The results show strong evidence that [N₂₂₂₄][CH₃COO]鈭?H₂O is an excellent reversible absorbent for CO₂, and the recovered [N₂₂₂₄][CH₃COO]鈭?H₂O maintains the same absorption capacity and absorption rate. The CO₂ absorption into [N₂₂₂₄][CH₃COO]鈭?i>nH₂O mixtures at 25 掳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鈥檚 law constant, overall rate constant, and activation energy are also calculated from the experimental data. All evidence indicates that [N₂₂₂₄][CH₃COO]鈭?i>nH₂O with low viscosity may have potential to be used as good absorbents for CO₂ capture.