Characterization and kinetics of carbon dioxide absorption into aqueous tetramethylammonium glycinate solution
Characterization and kinetics of carbon dioxide absorption into aqueous tetramethylammonium glycinate solution
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DOI：
10.1016/j.cej.2011.11.007
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发表时间：
2012-02
影响因子：
15.1
通讯作者：
Guohua Jing;Lan-Juan Zhou;Zuoming Zhou
中科院分区：
文献类型：
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作者：
Guohua Jing;Lan-Juan Zhou;Zuoming Zhou
一种先进的甘氨酸四甲基铵 ([N1111][Gly]) 水性胺溶剂的特征在于用于吸收二氧化碳 (CO2)。在 298 至 323K 的温度下测定浓度范围为 5% 至 30% 的 [N1111][Gly] 溶液的密度、粘度和 pH 值。估计了相同温度和浓度下 CO2 在 [N1111][Gly] 溶液中的溶解度和扩散率。使用具有平面气液界面的双搅拌池吸收器研究了 [N1111][Gly] 水溶液中 CO2 的吸收。研究了[N1111][Gly]浓度、温度和CO2浓度对[N1111][Gly]水溶液吸收CO2的影响。动力学研究表明，将CO2吸收到[N1111][Gly]水溶液中是快速的伪一级反应方案。基于反应状态，使用双膜模型获得了增强因子E、总反应动力学常数kov和二阶速率常数k2。结果表明，E与CB01/2呈线性关系，15%[N1111][Gly]水溶液吸收CO2的活化能为15.431kJmol−1。
An advanced aqueous amine solvent of tetramethylammonium glycinate ([N1111][Gly]) was characterized for carbon dioxide (CO2) absorption purposes. Density, viscosity and pH of the [N1111][Gly] solution, with concentrations ranging from 5% to 30%, were determined at temperatures from 298 to 323K. Solubility and diffusivity of CO2in [N1111][Gly] solution at the same temperatures and concentrations was estimated. Absorption of CO2into [N1111][Gly] aqueous solution was investigated using a double stirred-cell absorber with a planar gas–liquid interface. The effects of the [N1111][Gly] concentration, temperature and CO2concentration of absorption CO2into aqueous [N1111][Gly] were studied. The kinetics study showed that absorption CO2into aqueous [N1111][Gly] was the fast pseudo-first order reaction regime. Based on the reaction regime, the enhancement factor E, the overall reaction kinetic constant kovand the second-order rate constant k2were obtained using the two-film model. The results showed that E was linear with CB01/2, and the activation energy of 15% aqueous [N1111][Gly] absorbing CO2was 15.431kJmol−1.