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Nonaqueous amine-based absorbents for energy efficient CO2 capture

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  • Guo, Hui
  • Li, Chenxu
  • Shi, Xiaoqin
  • Li, Hui
  • Shen, Shufeng

Abstract

High energy consumption for CO2 capture using aqueous amines is still a major drawback limiting its deployment on a global scale. In this work, the absorption-desorption performance of CO2 into several blends of monoethanolamine (MEA) or diethanolamine (DEA) with glycol ethers (2-methoxyethanol (2ME) and 2-ethoxyethanol (2EE)) as nonaqueous solvents has been investigated at ambient pressure. Reaction mechanisms and the relative heat duty for these nonaqueous systems were also explored and compared with those of the aqueous MEA. Results showed that the nonaqueous absorbents with 5.0 M MEA had comparable absorption capacity with aqueous 5.0 M MEA and higher desorption efficiency resulting in a larger cyclic capacity (1.45 mol kg−1). Higher partial pressure ratio of CO2 to solvent vapor under the desorption conditions was also observed for these nonaqueous systems. 13C NMR, FTIR spectra and online conductivity analysis provided evidences that CO2 can react with MEA in nonaqueous solvents forming the ionic couples (i.e. protonated MEA and carbamate) as well as carbamic acid at high CO2 loading. The mixture of MEA and 2ME or 2EE could significantly reduce the energy consumption by about 55% as compared to the benchmark aqueous 5.0 M MEA system.

Suggested Citation

  • Guo, Hui & Li, Chenxu & Shi, Xiaoqin & Li, Hui & Shen, Shufeng, 2019. "Nonaqueous amine-based absorbents for energy efficient CO2 capture," Applied Energy, Elsevier, vol. 239(C), pages 725-734.
    • Handle: RePEc:eee:appene:v:239:y:2019:i:c:p:725-734
    DOI: 10.1016/j.apenergy.2019.02.019
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    References listed on IDEAS

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