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Performance and mechanism of CO2 absorption in 2-ethylhexan-1-amine + glyme non-aqueous solutions

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  • Fu, Kun
  • Liu, Chenxu
  • Wang, Lemeng
  • Huang, Xiayu
  • Fu, Dong

Abstract

In this work, novel non-aqueous absorbents composed of 2-ethylhexan-1-amine (EHA) and glyme were proposed for CO2 capture. The absorption performance of CO2 in EHA + diglyme, EHA + triglyme and EHA + tetraglyme non-aqueous solutions was investigated and the viscosities (η) of the CO2-saturated absorbents were measured. Besides the experiments, kinetic models were applied to correlate the CO2 absorption. The activation energy (Ea) was obtained from Arrhenius equation, and the absorption mechanism was deduced. The results showed that both Lagergren model and Avrami model can accurately correlate and predict the time-dependent absorption amount, thus an optimized composition under which excellent absorption performance and relatively low η and Ea can be simultaneously achieved was determined. Compared to water-based absorbents like MEA, the optimized non-aqueous absorbents take the advantages of better absorption performance and lower activation energy. Moreover, the glyme solvents have about 50% lower specific heat capacities and much higher boiling points (≥435 K) than water, which is expected to greatly reduce the sensible heat and the latent heat of the solvent during regeneration. Therefore, the proposed novel absorbents have promising industrial application potential in the CO2 capture process.

Suggested Citation

  • Fu, Kun & Liu, Chenxu & Wang, Lemeng & Huang, Xiayu & Fu, Dong, 2021. "Performance and mechanism of CO2 absorption in 2-ethylhexan-1-amine + glyme non-aqueous solutions," Energy, Elsevier, vol. 220(C).
    • Handle: RePEc:eee:energy:v:220:y:2021:i:c:s0360544220328425
    DOI: 10.1016/j.energy.2020.119735
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    References listed on IDEAS

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    1. Xiao, Min & Liu, Helei & Gao, Hongxia & Olson, Wilfred & Liang, Zhiwu, 2019. "CO2 capture with hybrid absorbents of low viscosity imidazolium-based ionic liquids and amine," Applied Energy, Elsevier, vol. 235(C), pages 311-319.
    2. Hwang, Junhyeok & Kim, Jeongnam & Lee, Hee Won & Na, Jonggeol & Ahn, Byoung Sung & Lee, Sang Deuk & Kim, Hoon Sik & Lee, Hyunjoo & Lee, Ung, 2019. "An experimental based optimization of a novel water lean amine solvent for post combustion CO2 capture process," Applied Energy, Elsevier, vol. 248(C), pages 174-184.
    3. Khalilpour, Rajab, 2014. "Multi-level investment planning and scheduling under electricity and carbon market dynamics: Retrofit of a power plant with PCC (post-combustion carbon capture) processes," Energy, Elsevier, vol. 64(C), pages 172-186.
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    Citations

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    Cited by:

    1. Neha Agarwal & Le Cao Nhien & Moonyong Lee, 2022. "Rate-Based Modeling and Assessment of an Amine-Based Acid Gas Removal Process through a Comprehensive Solvent Selection Procedure," Energies, MDPI, vol. 15(18), pages 1-17, September.
    2. Fu, Kun & Zheng, Mingzhen & Wang, Haijie & Fu, Dong, 2022. "Effect of water content on the characteristics of CO2 capture processes in absorbents of 2-ethylhexan-1-amine + diglyme," Energy, Elsevier, vol. 244(PA).
    3. Fu, Kun & Zheng, Mingzhen & Fu, Dong, 2023. "Low partial pressure CO2 capture in packed tower by EHA+Diglyme water-lean absorbent," Energy, Elsevier, vol. 266(C).
    4. Zhou, Xiaobin & Liu, Chao & Fan, Yinming & Zhang, Lihao & Tang, Shen & Mo, Shengpeng & Zhu, Yinian & Zhu, Zongqiang, 2022. "Energy-efficient carbon dioxide capture using a novel low-viscous secondary amine-based nonaqueous biphasic solvent: Performance, mechanism, and thermodynamics," Energy, Elsevier, vol. 255(C).
    5. Meng, Fanli & Fu, Kun & Wang, Xueli & Wang, Yixiao & Wang, Lemeng & Fu, Dong, 2024. "Study on absorption and regeneration performance of EHA-DMSO non-aqueous absorbent for CO2 capture from flue gas," Energy, Elsevier, vol. 286(C).
    6. Han, Siyu & Meng, Yuan & Aihemaiti, Aikelaimu & Gao, Yuchen & Ju, Tongyao & Xiang, Honglin & Jiang, Jianguo, 2022. "Biogas upgrading with various single and blended amines solutions: Capacities and kinetics," Energy, Elsevier, vol. 253(C).

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