Kinetics of carbon dioxide absorption into aqueous [Hmim][Gly] solution

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• 作者：Hongxiu Guo ^{ghx495140023@163.com} ; Zuoming Zhou ^{zzm1975@126.com} ; Guohua Jing ; ^{zhoujing@hqu.edu.cn}
• 关键词：Carbon dioxide ; 1-Hexyl-3-methylimidazolium glycine ; Absorption ; Regeneration ; Kinetics
• 刊名：International Journal of Greenhouse Gas Control
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：16
• 期：Complete
• 页码：197-205
• 全文大小：759 K

文摘

CO₂ absorption performance in the [Hmim][Gly] solution was investigated in detail at 298, 303, 313, 323 K within the concentration range of 0.5-1.2 M under an atmospheric pressure by using a double stirred cell absorber with a planar gas-liquid interface. The density, viscosity and pH of the [Hmim][Gly] solution were obtained, and the solubility and diffusivity of CO₂ in [Hmim][Gly] solution were calculated. To explore the regeneration property of the CO₂-loaded solution, method under vacuum pressure was used by varying the regeneration temperature from 328 to 343 K and the regeneration time in the range of 30-120 min. The effect of regeneration cycles on regeneration efficiency was also determined. The kinetic results demonstrated that the reaction took place in a fast pseudo-first order regime. Hatta number Ha, the enhancement factor E, the overall reaction kinetic constant k_ov and the second-order rate constant k₂ were obtained using the two-film model. At the absorption temperature of 303 K, the enhancement factor E was linear with . The second-order reaction rate was determined as the following equation: .