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Choline-based deep eutectic solvents for CO2 separation: Review and thermodynamic analysis

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  • Zhang, Yingying
  • Ji, Xiaoyan
  • Lu, Xiaohua

Abstract

CO2 separation plays an important role in energy saving and CO2 emission reduction, both of which are necessary to address the issue of global warming. Ionic liquids (ILs) have been proposed to be “green” solvents for CO2 separation. Unfortunately, the high cost, toxicity, and poor biodegradability of these compounds limit their large-scale application. Deep eutectic solvents (DESs) were recently considered a new type of IL with additional advantages in terms of cost, environmental impact, and synthesis. DESs based on choline salts (i.e., choline-based DESs) are promising candidates for CO2 separation. In this work, the microstructures, physicochemical properties, and water effect of choline-based DESs are surveyed and compared with those of conventional ILs. The properties of choline-based DESs are similar to those of conventional ILs, but research on the latter remains limited. Further study on the microstructures, properties, and separation performance of choline-based DESs considering dynamic factors must be carried out through experimental measurements and model development. Thermodynamic analysis based on Gibbs free energy change is conducted to investigate the performances of choline-based-DESs during CO2 separation from biogas. Choline-based-DESs are screened on the basis of energy use and amount of absorbent needed. The performances of the screened choline-based-DESs are further compared with those of conventional ILs screened in our previous work, as well as commercial CO2 absorbents. Comparisons indicate that the screened DES-based absorbents show great application potential due to their nonvolatility, low energy use, or low amount required. The performances of physical choline-based-DES and 30 wt% MEA for CO2 separation from other gas streams (e.g., flue gas, lime kiln gas, and bio-syngas) are discussed. Considering the high amounts of physical absorbents required to enable separation, further study with techno-economic analysis needs to be carried out.

Suggested Citation

  • Zhang, Yingying & Ji, Xiaoyan & Lu, Xiaohua, 2018. "Choline-based deep eutectic solvents for CO2 separation: Review and thermodynamic analysis," Renewable and Sustainable Energy Reviews, Elsevier, vol. 97(C), pages 436-455.
    • Handle: RePEc:eee:rensus:v:97:y:2018:i:c:p:436-455
    DOI: 10.1016/j.rser.2018.08.007
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    References listed on IDEAS

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    1. Zhang, Yingying & Ji, Xiaoyan & Xie, Yujiao & Lu, Xiaohua, 2018. "Thermodynamic analysis of CO2 separation from biogas with conventional ionic liquids," Applied Energy, Elsevier, vol. 217(C), pages 75-87.
    2. Jianmin Zhang & Jian Sun & Xiaochun Zhang & Yansong Zhao & Suojiang Zhang, 2011. "The recent development of CO 2 fixation and conversion by ionic liquid," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 1(2), pages 142-159, June.
    3. Zhang, Yingying & Ji, Xiaoyan & Lu, Xiaohua, 2014. "Energy consumption analysis for CO2 separation from gas mixtures," Applied Energy, Elsevier, vol. 130(C), pages 237-243.
    4. Zhang, Yingying & Ji, Xiaoyan & Xie, Yujiao & Lu, Xiaohua, 2016. "Screening of conventional ionic liquids for carbon dioxide capture and separation," Applied Energy, Elsevier, vol. 162(C), pages 1160-1170.
    5. Xie, Yujiao & Zhang, Yingying & Lu, Xiaohua & Ji, Xiaoyan, 2014. "Energy consumption analysis for CO2 separation using imidazolium-based ionic liquids," Applied Energy, Elsevier, vol. 136(C), pages 325-335.
    6. Jason E. Bara, 2012. "What chemicals will we need to capture CO 2 ?," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 2(3), pages 162-171, June.
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    Cited by:

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    3. Sun, Jiasi & Sato, Yuki & Sakai, Yuka & Kansha, Yasuki, 2023. "Ternary deep eutectic solvents: Evaluations based on how their physical properties affect energy consumption during post-combustion CO2 capture," Energy, Elsevier, vol. 270(C).

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