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Super-low energy consuming CO2 capture triggered by weak hydrogen bonds in solid-liquid phase separation

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Listed:
  • Wang, Lidong
  • Fang, Jie
  • Ma, Haojun
  • Wang, Chuhuan
  • Wang, Rujie
  • Li, Qiangwei
  • Zhang, Shihan

Abstract

A novel nonaqueous solid-liquid biphasic solvent, diethylenetriamine (DETA)/dimethyl sulfoxide (DMSO), with considerable CO2 absorption capacity and extremely low regeneration heat, was proposed. After absorbing CO2, the precipitate exhibited a CO2 loading of 0.0070 mol g−1, which accounted for 96.9% of the captured CO2. Benefiting from the greatly reduced reaction heat, sensible heat, and latent heat, the estimated regeneration energy using DETA/DMSO biphasic solvent was reduced to 0.74 GJ t−1 CO2. The corresponding regeneration cost was 44.4 CNY·t−1 CO2, only 19.5% of 5 M MEA, and much lower than the reported biphasic solvents. Moreover, the DETA/DMSO absorbent had good absorption/desorption stability and large desorption efficiency (about 92%). In addition, the substances distribution and CO2 absorption mechanisms of DETA/DMSO were revealed. DETA-carbamate and protonated DETA were recognized as the major CO2 absorption products, while a small amount of carbamic acid rearranging from zwitterion could also exist stably in DMSO diluent. Because of the huge polarity difference of these species in CO2-loaded absorbent, high polarity DETA-CO2 products aggregated together due to weak hydrogen bonds and precipitated from the liquid phase. Overall, the DETA/DMSO biphasic solvent was proved to be a potential candidate for conventional MEA in sustainable CO2 capture.

Suggested Citation

  • Wang, Lidong & Fang, Jie & Ma, Haojun & Wang, Chuhuan & Wang, Rujie & Li, Qiangwei & Zhang, Shihan, 2023. "Super-low energy consuming CO2 capture triggered by weak hydrogen bonds in solid-liquid phase separation," Energy, Elsevier, vol. 272(C).
    • Handle: RePEc:eee:energy:v:272:y:2023:i:c:s036054422300556x
    DOI: 10.1016/j.energy.2023.127162
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    References listed on IDEAS

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    2. Yin, Xin & Shen, Shufeng, 2023. "Water-lean monophasic absorbents containing secondary alkanolamines and dimethyl sulfoxide for energy-efficient CO2 capture," Energy, Elsevier, vol. 281(C).

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