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Energy efficient diethylenetriamine–1-propanol biphasic solvent for CO2 capture: Experimental and theoretical study

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  • Wang, Rujie
  • Yang, Yuying
  • Wang, Mengfan
  • Lin, Jinshan
  • Zhang, Shihan
  • An, Shanlong
  • Wang, Lidong

Abstract

Biphasic solvents characterized by a substantially decreased regeneration heat consumption are promising alternative CO2 absorbents to typical monoethanolamine (MEA). In this study, 1-propanol was used as a phase splitter for diethylenetriamine (DETA) aqueous solvents. A tunable phase separation property was achieved by simply varying the concentration of 1-propanol. The 30 wt% DETA–50 wt% 1-propanol solvent exhibited the best phase separation properties with a volume ratio (rich–phase) of 41.7% and a rich loading of 6.54 mol/L. A molecular scale understanding of the phase separation mechanism was revealed through molecular dynamics simulations. Upon 1-propanol introduction, strong hydrogen bond interactions tended to be established between uncovered DETACOO– and DETAH+ and triggered the evolution of phase separation. Furthermore, 1-propanol functioned as an absorption activator by increasing the overall mass transfer coefficient (KG) from 2.11 to 3.22 × 10–10 mol/cm2·s·Pa. DETA–1-propanol achieved a regeneration heat of 2.12 GJ/t CO2, which was 46.9% lower than that of 5 M MEA. This study provides a molecular-scale understanding of the phase separation mechanism and a promising DETA–1-propanol biphasic solvent with favorable phase separation behavior, rapid CO2 absorption, high CO2 absorption capacity, and superior energy-saving regeneration.

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  • 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).
    • Handle: RePEc:eee:appene:v:290:y:2021:i:c:s0306261921002750
    DOI: 10.1016/j.apenergy.2021.116768
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    7. Yuan, Bingling & Chen, Zhen & Zhang, Qianxuan & Zhan, Guoxiong & Xing, Lei & Huang, Zhoulan & Li, Yuchen & Wang, Lidong & Li, Junhua, 2024. "Sulfolane-based biphasic solvent with high water-balance robustness and degradation resistance for industrial CO2 capture," Applied Energy, Elsevier, vol. 366(C).
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    9. 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).
    10. Wang, Rujie & Zhao, Huajun & Qi, Cairao & Yang, Xiaotong & Zhang, Shihan & Li, Ming & Wang, Lidong, 2022. "Novel tertiary amine-based biphasic solvent for energy-efficient CO2 capture with low corrosivity," Energy, Elsevier, vol. 260(C).
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