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A novel method to recover ammonia loss in ammonia‐based CO 2 capture system: ammonia regeneration by vacuum membrane distillation

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  • Mengxiang Fang
  • Qinhui Ma
  • Zhen Wang
  • Qunyang Xiang
  • Wenmin Jiang
  • Zhixiang Xia

Abstract

Aiming to solve the problem of high ammonia loss during ammonia‐based CO 2 chemical absorption process, an ammonia wash system was recommended to be added after the absorber column. Hence, we need to deal with a lot of wash water. Recently, we proposed a vacuum membrane distillation (VMD) system to regenerate ammonia from ammonia wash water. The stripping gaseous ammonia can be used for producing a high‐concentration ammonia solution for solvent make‐up in the CO 2 capture system, and the wash water after distillation can be reused. In this work, we investigated 0.3 M ammonia solutions on different operation factors such as feed flow rate, feed temperature, pressure in the permeate side, and CO 2 loading. The experimental results show that both temperature and pressure in the permeate side have significant influences on the ammonia stripping process. Increasing feed temperature and reducing pressure in the permeate side will not only improve ammonia removal efficiency, but also enhance total transmembrane flux and overall mass transfer coefficient. The increase of feed flow rate can improve the total transmembrane flux, but will lower the ammonia removal efficiency. The increase of CO 2 loading in the feed ammonia solution will decrease the ammonia removal rate. Furthermore, we investigated a continuous circulation experiment and found that the ammonia removal efficiency largely depended on the removal time. The removal efficiency can be up to 95.6% with a 120 min continuous circulation time. We think this VMD system has the potential to recover ammonia and solve the solvent loss problem. © 2015 Society of Chemical Industry and John Wiley & Sons, Ltd

Suggested Citation

  • Mengxiang Fang & Qinhui Ma & Zhen Wang & Qunyang Xiang & Wenmin Jiang & Zhixiang Xia, 2015. "A novel method to recover ammonia loss in ammonia‐based CO 2 capture system: ammonia regeneration by vacuum membrane distillation," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 5(4), pages 487-498, August.
    • Handle: RePEc:wly:greenh:v:5:y:2015:i:4:p:487-498
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    File URL: http://hdl.handle.net/10.1002/ghg.1503
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    Cited by:

    1. 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.
    2. Chu, Fengming & Gao, Qianhong & Li, Shang & Yang, Guoan & Luo, Yan, 2020. "Mass transfer characteristic of ammonia escape and energy penalty analysis in the regeneration process," Applied Energy, Elsevier, vol. 258(C).
    3. 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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