Kinetics of Carbon Dioxide Absorption into Mixed Aqueous Solutions of MEA + [Bmim]BF4 Using a Double Stirred Cell
Kinetics of Carbon Dioxide Absorption into Mixed Aqueous Solutions of MEA + [Bmim]BF4 Using a Double Stirred Cell
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DOI：
10.1021/ef400976j
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发表时间：
2013-09
期刊：
影响因子：
5.3
通讯作者：
Bi-hong Lu;Xiang-qian Wang;Yinfeng Xia;Nan Liu;Sujing Li;W. Li
中科院分区：
文献类型：
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作者：
Bi-hong Lu;Xiang-qian Wang;Yinfeng Xia;Nan Liu;Sujing Li;W. Li
采用双搅拌槽研究了单乙醇胺（MEA）和1-丁基-3-甲基咪唑四氟硼酸盐（[Bmim] BF 4）的混合溶液在CO2分压为15 kPa的条件下吸收模拟烟气中的CO2。结果表明，在相同MEA浓度下，混合溶液吸收CO2的增强因子（E）和二级反应速率常数（k2，mix）均高于单一MEA溶液吸收CO2的增强因子和二级反应速率常数。在303.15 K时，k2，mix和k2，IL分别为3487.6 m3·kmol-1·s-1和1936.7 m3·kmol-1·s-1。并估算了CO2吸收的Arcourius方程。实验结果证实了[Bmim] BF_4对CO_2水化有积极作用的假设。吸附剂在溶液中的扩散和溶解度是反应的限制因素。
An aqueous blend of monoethanolamine (MEA) and 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) for CO2 absorption from simulated flue gas was investigated using a double stirred cell at a CO2 partial pressure of 15 kPa. It was found that the values of the enhancement factor (E) and the second-order reaction rate constant (k2,mix) for CO2 absorption into mixed solution were higher than those into a single MEA aqueous solution with the same MEA concentration. k2,mix and k2, IL were found to be 3487.6 m3·kmol–1·s–1 and 1936.7 m3·kmol–1·s–1 at 303.15 K, respectively. The Arrhenius equation of CO2 absorption was also estimated. The results proved the assumption that [Bmim]BF4 had an active effect on the CO2 hydration. The diffusion and solubility of the absorbent in the solution were the limiting factors of the reaction.