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Effect of water content on the characteristics of CO2 capture processes in absorbents of 2-ethylhexan-1-amine + diglyme

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  • Fu, Kun
  • Zheng, Mingzhen
  • Wang, Haijie
  • Fu, Dong

Abstract

In our recent study (Fu et al., 2021), 70 wt% 2-ethylhexan-1-amine (EHA) + 30 wt% diglyme was proven to be a promising system for carbon dioxide (CO2) absorption. In this work, the capture performance of 15 kPa CO2 in 70 wt% EHA + (30 or 25 or 20) wt% diglyme solution was investigated. The evolution of solution composition during the capture process was identified. The time-dependent absorption and desorption capacities were accurately correlated by using the modified Avrami model. After 90 min of absorption, the proposed sorbents maintained relatively low viscosities (≤32.07 mPa s) and had much lower heat capacities than the aqueous 30 wt% ethanolamine (MEA). The CO2 desorption capacities of the sorbents containing 0 wt%, 5 wt% and 10 wt% water were higher than that of the aqueous 30 wt% MEA by 134.1%, 123.6% and 91.7%, respectively. The regeneration efficiency of the sorbents containing 0 wt%, 5 wt% and 10 wt% water was 92.1%, 87.9% and 83.8%, respectively, in the 5th absorption (313 K) - desorption (373 K) cycle. Furthermore, it is encouraging to note that the energy consumption for CO2 desorption of proposed sorbents was below 20% of that of the aqueous 30 wt% MEA.

Suggested Citation

  • Fu, Kun & Zheng, Mingzhen & Wang, Haijie & Fu, Dong, 2022. "Effect of water content on the characteristics of CO2 capture processes in absorbents of 2-ethylhexan-1-amine + diglyme," Energy, Elsevier, vol. 244(PA).
    • Handle: RePEc:eee:energy:v:244:y:2022:i:pa:s0360544221029054
    DOI: 10.1016/j.energy.2021.122656
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    References listed on IDEAS

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    1. Barzagli, Francesco & Giorgi, Claudia & Mani, Fabrizio & Peruzzini, Maurizio, 2018. "Reversible carbon dioxide capture by aqueous and non-aqueous amine-based absorbents: A comparative analysis carried out by 13C NMR spectroscopy," Applied Energy, Elsevier, vol. 220(C), pages 208-219.
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    Cited by:

    1. Yin, Xin & Shen, Shufeng, 2023. "Water-lean monophasic absorbents containing secondary alkanolamines and dimethyl sulfoxide for energy-efficient CO2 capture," Energy, Elsevier, vol. 281(C).
    2. Fu, Kun & Zheng, Mingzhen & Fu, Dong, 2023. "Low partial pressure CO2 capture in packed tower by EHA+Diglyme water-lean absorbent," Energy, Elsevier, vol. 266(C).
    3. Meng, Fanli & Fu, Kun & Wang, Xueli & Wang, Yixiao & Wang, Lemeng & Fu, Dong, 2024. "Study on absorption and regeneration performance of EHA-DMSO non-aqueous absorbent for CO2 capture from flue gas," Energy, Elsevier, vol. 286(C).

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