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

International Journal of Greenhouse Gas Control
DOI: 10.1016/j.ijggc.2013.03.024
  • Carbon Dioxide
  • 1-Hexyl-3-Methylimidazolium Glycine
  • Absorption
  • Regeneration
  • Kinetics


Abstract CO2 absorption performance in the [Hmim][Gly] solution was investigated in detail at 298, 303, 313, 323K within the concentration range of 0.5–1.2M 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 343K and the regeneration time in the range of 30–120min. 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 kov and the second-order rate constant k2 were obtained using the two-film model. At the absorption temperature of 303K, the enhancement factor E was linear with CIL1/2. The second-order reaction rate was determined as the following equation: k2=3.04×107exp(−3050/T).

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