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Performance and mechanisms of CO2 capture by water-lean 3-diethylaminopropylamine (DEAPA) based absorbents

Author

Listed:
  • Wang, Lemeng
  • Wang, Xueli
  • Ma, Jian
  • Meng, Fanli
  • Li, Kangrui
  • Li, Ming
  • Wang, Rujie
  • Wang, Han
  • Gao, Huiying
  • Zhao, Kun
  • Fu, Dong
  • Zhang, Pan

Abstract

Water-lean amines are currently being investigated for their potential in energy-efficient post-combustion CO2 capture. However, enhancing the absorption capacity and regeneration efficiency remains a critical challenge. In this study, we selected two amines and five alcohol ethers as organic solvents to develop a water-lean system. The performance of these water-lean absorbents, with a water content 10 wt%, was compared to the benchmark 30 wt% MEA aqueous solution. Our findings indicated the DEAPA/FA/H2O water-lean absorbent exhibited exceptional absorption capacity (0.897 mol CO2/mol amine) and high regeneration efficiency (89.2 %), positioning it as a promising candidate for CO2 capture. The regeneration energy consumption across different systems was assessed using an improved method for electric energy consumption. It was discovered that the regeneration heat load of the DEAPA/FA/H2O water-lean absorbent was approximately 50 % lower than that of the conventional 30 wt% MEA aqueous solution. To assess its CO2 capture effectiveness in flue gas, the stability of the DEAPA/FA/H2O solution was confirmed through five consecutive cycle experiments, achieving a regeneration efficiency of 92 % after the fifth cycle. Analysis of the samples using 13C NMR spectroscopy and Fourier Transform Infrared Spectrometer (FTIR) revealed that CO2 react with DEAPA to form an unstable carbamate and HCO3−/CO32−.

Suggested Citation

  • Wang, Lemeng & Wang, Xueli & Ma, Jian & Meng, Fanli & Li, Kangrui & Li, Ming & Wang, Rujie & Wang, Han & Gao, Huiying & Zhao, Kun & Fu, Dong & Zhang, Pan, 2025. "Performance and mechanisms of CO2 capture by water-lean 3-diethylaminopropylamine (DEAPA) based absorbents," Energy, Elsevier, vol. 320(C).
    • Handle: RePEc:eee:energy:v:320:y:2025:i:c:s0360544225008746
    DOI: 10.1016/j.energy.2025.135232
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    References listed on IDEAS

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