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Energy-saving CO2 capture using sulfolane-regulated biphasic solvent

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  • Wang, Rujie
  • Jiang, Lei
  • Li, Qiangwei
  • Gao, Ge
  • Zhang, Shihan
  • Wang, Lidong

Abstract

Because of phase separation characteristics, biphasic solvents are recognized as promising absorbents for CO2 capture with low regeneration heat consumption. However, limited CO2 loading in CO2-rich phase, associated with excessive CO2-rich phase volume, challenges the energy-saving regeneration potential of mixed-amine biphasic solvents. In this study, sulfolane was employed as a phase splitter to improve the phase separation properties of N,N-diethylenetriamine (DETA)-N,N,N′,N″,N″-pentamethyldiethylenetriamine (PMDETA) biphasic absorbent. By introducing the hydrophobic sulfolane, large CO2 capacity (increased from 3.56 to 6.48 mol/L) and low CO2-rich phase volume (decreased from 100% to 27.1%) were simultaneously achieved. Moreover, sulfolane acted as an absorption accelerator to increase the CO2 absorption rate in DETA-PMDETA-sulfolane solvent to 1.3 times the corresponding DETA-PMDETA solvent. Benefiting from the large CO2 capacity associated with favorable phase separation behavior, DETA-PMDETA-sulfolane has a minimized regeneration heat estimated at 1.86 GJ/t-CO2 at a lean CO2-loading of 0.55 mol/mol. This is 53.4% lower than the regeneration heat (3.99 GJ/t-CO2) using 5 M monoethanolamine solvent.

Suggested Citation

  • Wang, Rujie & Jiang, Lei & Li, Qiangwei & Gao, Ge & Zhang, Shihan & Wang, Lidong, 2020. "Energy-saving CO2 capture using sulfolane-regulated biphasic solvent," Energy, Elsevier, vol. 211(C).
    • Handle: RePEc:eee:energy:v:211:y:2020:i:c:s0360544220317758
    DOI: 10.1016/j.energy.2020.118667
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    References listed on IDEAS

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    2. Wang, Rujie & Liu, Shanshan & Li, Qiangwei & Zhang, Shihan & Wang, Lidong & An, Shanlong, 2021. "CO2 capture performance and mechanism of blended amine solvents regulated by N-methylcyclohexyamine," Energy, Elsevier, vol. 215(PB).
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    4. 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).
    5. Zhou, Xiaobin & Liu, Chao & Zhang, Jie & Fan, Yinming & Zhu, Yinian & Zhang, Lihao & Tang, Shen & Mo, Shengpeng & Zhu, Hongxiang & Zhu, Zongqiang, 2023. "Novel 2-amino-2-methyl-1-propanol-based biphasic solvent for energy-efficient carbon dioxide capture using tetraethylenepentamine as a phase change regulator," Energy, Elsevier, vol. 270(C).
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