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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.

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  • 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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    6. Nguyen, Ngoc N. & La, Vinh T. & Huynh, Chinh D. & Nguyen, Anh V., 2022. "Technical and economic perspectives of hydrate-based carbon dioxide capture," Applied Energy, Elsevier, vol. 307(C).
    7. 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).
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