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CO2 capture by biphasic absorbent–absorption performance and VLE characteristics

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  • Zhuang, Quan
  • Clements, Bruce

Abstract

Amine dissolved in alcohol is one of the possible biphasic absorbents for CO2 capture. Monoethanolamine (MEA) and methylaminoethanol (MAE) in isooctanol and 1-heptanol, respectively, were tested as absorbents by using a self-made batch mode chemisorption apparatus. CO2 absorption vapour-liquid equilibrium (VLE) curves were obtained. Phase separation of the absorbent MEA in alcohols occurred readily upon CO2 absorption at the absorption temperature. The CO2 bubbling absorption tests indicated that MAE in the alcohols did not experience phase separation in the whole possible operating temperature range from ambient to 90 °C. The principle for identifying potential CO2 phase separation absorbents is by a good match of the relative strength of the polarity of the amines with the solvent (alcohol in this study), and its change upon CO2 absorption and/or on further temperature increase of the CO2 loaded absorbent. The VLE curves are one of the most important properties of a CO2/absorbent system, based on which, some of the engineering design and operation conditions of a CO2 absorption process can be determined.

Suggested Citation

  • Zhuang, Quan & Clements, Bruce, 2018. "CO2 capture by biphasic absorbent–absorption performance and VLE characteristics," Energy, Elsevier, vol. 147(C), pages 169-176.
    • Handle: RePEc:eee:energy:v:147:y:2018:i:c:p:169-176
    DOI: 10.1016/j.energy.2018.01.004
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    Cited by:

    1. Wang, Rujie & Yang, Yuying & Wang, Mengfan & Lin, Jinshan & Zhang, Shihan & An, Shanlong & Wang, Lidong, 2021. "Energy efficient diethylenetriamine–1-propanol biphasic solvent for CO2 capture: Experimental and theoretical study," Applied Energy, Elsevier, vol. 290(C).
    2. Shen, Yao & Chen, Han & Wang, Junliang & Zhang, Shihan & Jiang, Chenkai & Ye, Jiexu & Wang, Lidong & Chen, Jianmeng, 2020. "Two-stage interaction performance of CO2 absorption into biphasic solvents: Mechanism analysis, quantum calculation and energy consumption," Applied Energy, Elsevier, vol. 260(C).
    3. Zhang, Shihan & Shen, Yao & Wang, Lidong & Chen, Jianmeng & Lu, Yongqi, 2019. "Phase change solvents for post-combustion CO2 capture: Principle, advances, and challenges," Applied Energy, Elsevier, vol. 239(C), pages 876-897.
    4. Laura A. Pellegrini & Matteo Gilardi & Fabio Giudici & Elvira Spatolisano, 2021. "New Solvents for CO 2 and H 2 S Removal from Gaseous Streams," Energies, MDPI, vol. 14(20), pages 1-40, October.

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