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CO 2 absorption by piperazine promoted aqueous ammonia solution: absorption kinetics and ammonia loss

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  • Lichun Li
  • Wenfeng Han
  • Hai Yu
  • Haodong Tang

Abstract

Aqueous ammonia (NH 3 ) solution has been proposed as a promising absorbent for post‐combustion capture of carbon dioxide (CO 2 ). However, when aqueous NH 3 is used alone, the capture process suffers from a low CO 2 absorption rate and high NH 3 loss. In this study, we measured CO 2 mass transfer coefficients and NH 3 loss rate in a wetted wall column study of CO 2 absorption in piperazine (PZ) promoted aqueous NH 3 solution, at NH 3 concentrations of 0.59–4.12 mol/L (M), CO 2 loadings (molar ratio of CO 2 /NH 3 ) of 0 to 0.5, temperatures of 283.15–298.15 K. The second‐order rate constants for the reactions of CO 2 with PZ and NH 3 , which are determined based on the kinetic results from the wetted wall column, agree reasonably well with published values. Addition of PZ to aqueous NH 3 can significantly increase mass transfer coefficients of CO 2 in aqueous NH 3 , but at the expenses of an increase in NH 3 loss. The enhancement by addition of PZ is due to the fast reaction of CO 2 with PZ and PZ carbamate. However, addition of PZ to aqueous NH 3 increases the concentration of free NH 3 in the solvent, thereby increasing NH 3 loss.

Suggested Citation

  • Lichun Li & Wenfeng Han & Hai Yu & Haodong Tang, 2013. "CO 2 absorption by piperazine promoted aqueous ammonia solution: absorption kinetics and ammonia loss," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 3(3), pages 231-245, June.
  • Handle: RePEc:wly:greenh:v:3:y:2013:i:3:p:231-245
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    File URL: http://hdl.handle.net/10.1002/ghg.1347
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    Cited by:

    1. Yu, Bing & Yu, Hai & Li, Kangkang & Yang, Qi & Zhang, Rui & Li, Lichun & Chen, Zuliang, 2017. "Characterisation and kinetic study of carbon dioxide absorption by an aqueous diamine solution," Applied Energy, Elsevier, vol. 208(C), pages 1308-1317.
    2. Wang, Fu & Zhao, Jun & Miao, He & Zhao, Jiapei & Zhang, Houcheng & Yuan, Jinliang & Yan, Jinyue, 2018. "Current status and challenges of the ammonia escape inhibition technologies in ammonia-based CO2 capture process," Applied Energy, Elsevier, vol. 230(C), pages 734-749.
    3. Lichun Li & Xiangcan Chen & Zhengfei Chen & Ruiqin Gao & Hangdi Yu & Tian Yuan & Zongjian Liu & Marcel Maeder, 2021. "Heterogeneous catalysts for the hydrogenation of amine/alkali hydroxide solvent captured CO2 to formate: A review," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 11(4), pages 807-823, August.
    4. Yifang Liu & Fengming Chu & Lijun Yang & Xiaoze Du & Yongping Yang, 2018. "CO2 absorption characteristics in a random packed column with various geometric structures and working conditions," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 8(1), pages 120-132, February.

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