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CO2 capture with the absorbent of a mixed ionic liquid and amine solution considering the effects of SO2 and O2

Author

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  • Yang, Jie
  • Yu, Xinhai
  • An, Lin
  • Tu, Shan-Tung
  • Yan, Jinyue

Abstract

Room-temperature ionic liquids (ILs) have recently been proposed as a potential candidate for CO2 capture. In this study, experiments were conducted in an absorption-desorption loop system to investigate the effects of SO2 and O2 on CO2 capture using an aqueous amine solution mixed with IL. The gas mixture containing CO2, O2, SO2 and N2 in the composition range of flue gas from a coal-fired power plant after flue gas desulfurization was selected as the feed gas. It was found that the addition of hydrophilic IL of 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) to a monoethanolamine (MEA) aqueous solution reduced the losses of MEA and water by lowering the saturated vapour pressure of the mixed absorbent. For hydrophobic IL of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([hmim][Tf2N]), the MEA loss for 30wt% MEA+70wt% [hmim][Tf2N] increased dramatically with the system running because carbonate, which was formed by MEA reacting with CO2, was insoluble in [hmim][Tf2N] at the absorber operation temperature of 323K. The effects of O2 and SO2 were relatively insignificant for the MEA and water losses. The aqueous amine solution mixed with [bmim][BF4] showed good performances with a CO2 removal efficiency of above 90% and the SO2 concentration at the absorber outlet below 20ppb. No obvious IL loss was detected. For the absorbent of 30wt% MEA+50wt% [bmim][BF4]+20wt% H2O, the thermal energy consumption for absorbent regeneration is 33.8% lower than that of the aqueous MEA solution.

Suggested Citation

  • Yang, Jie & Yu, Xinhai & An, Lin & Tu, Shan-Tung & Yan, Jinyue, 2017. "CO2 capture with the absorbent of a mixed ionic liquid and amine solution considering the effects of SO2 and O2," Applied Energy, Elsevier, vol. 194(C), pages 9-18.
    • Handle: RePEc:eee:appene:v:194:y:2017:i:c:p:9-18
    DOI: 10.1016/j.apenergy.2017.02.071
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    1. Jiang, Xuemei & Guan, Dabo, 2016. "Determinants of global CO2 emissions growth," Applied Energy, Elsevier, vol. 184(C), pages 1132-1141.
    2. Yang, Jie & Yu, Xinhai & Yan, Jinyue & Tu, Shan-Tung & Dahlquist, Erik, 2013. "Effects of SO2 on CO2 capture using a hollow fiber membrane contactor," Applied Energy, Elsevier, vol. 112(C), pages 755-764.
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