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Thermodynamic analysis of CO2 separation from biogas with conventional ionic liquids

Author

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

Abstract

CO2 separation plays an important role in energy saving and CO2 emission reduction to address global warming. Ionic liquids (ILs) have been proposed as potential absorbents for CO2 separation, and a large amount of ILs have been synthesized to achieve this purpose. To screen ILs for CO2 separation, CO2 absorption capacity/selectivity and energy use have been considered, whereas the required amount of IL has been seldom involved. In this work, CO2 separation from biogas with 30 conventional ILs was analyzed theoretically on the basis of the Gibbs free energy change combining the amount of IL needed and the energy use. The desorption temperature was estimated from the absorption pressure, and then the amount of IL needed and the energy use were calculated. Thermodynamic analysis shows that the absorption pressure and the desorption temperature need to be changed to achieve optimal separation. Several ILs were screened with certain criteria, namely, the amount of IL needed and energy use. The performance of the screened ILs was compared with that of commercial CO2 absorbents (30 wt% MEA, 30 wt% MDEA, DEPG, and water). The comparison with DEPG and water shows that the screened physical ILs are promising for IL-based technologies because of their advantages of negligible vaporization enthalpy, low amount of absorbent needed, or low energy use. A comparison with 30 wt% MEA and 30 wt% MDEA indicates that chemical IL has negligible vaporization enthalpy and low energy use. These findings show that the screened ILs are promising for CO2 separation from biogas.

Suggested Citation

  • 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.
  • Handle: RePEc:eee:appene:v:217:y:2018:i:c:p:75-87
    DOI: 10.1016/j.apenergy.2018.02.079
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    References listed on IDEAS

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    1. 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.
    2. Gao, Jubao & Cao, Lingdi & Dong, Haifeng & Zhang, Xiangping & Zhang, Suojiang, 2015. "Ionic liquids tailored amine aqueous solution for pre-combustion CO2 capture: Role of imidazolium-based ionic liquids," Applied Energy, Elsevier, vol. 154(C), pages 771-780.
    3. 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.
    4. 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.
    5. Lu, Jian-Gang & Lu, Chun-Ting & Chen, Yue & Gao, Liu & Zhao, Xin & Zhang, Hui & Xu, Zheng-Wen, 2014. "CO2 capture by membrane absorption coupling process: Application of ionic liquids," Applied Energy, Elsevier, vol. 115(C), pages 573-581.
    6. Theo, Wai Lip & Lim, Jeng Shiun & Hashim, Haslenda & Mustaffa, Azizul Azri & Ho, Wai Shin, 2016. "Review of pre-combustion capture and ionic liquid in carbon capture and storage," Applied Energy, Elsevier, vol. 183(C), pages 1633-1663.
    7. Yang, Jie & Yu, Xinhai & An, Lin & Tu, Shan-Tung & Yan, Jinyue, 2017. "CO2 capture with the absorbent of a mixed ionic liquid and amine solution considering the effects of SO2 and O2," Applied Energy, Elsevier, vol. 194(C), pages 9-18.
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    Cited by:

    1. Yang, Hou-Yun & Wang, Yi-Xuan & He, Chuan-Shu & Qin, Yuan & Li, Wen-Qiang & Li, Wei-Hua & Mu, Yang, 2020. "Redox mediator-modified biocathode enables highly efficient microbial electro-synthesis of methane from carbon dioxide," Applied Energy, Elsevier, vol. 274(C).
    2. 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.
    3. Edyta Słupek & Patrycja Makoś & Jacek Gębicki, 2020. "Theoretical and Economic Evaluation of Low-Cost Deep Eutectic Solvents for Effective Biogas Upgrading to Bio-Methane," Energies, MDPI, vol. 13(13), pages 1-19, July.

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