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A new approach to the upgrading of the traditional propylene carbonate washing process with significantly higher CO2 absorption capacity and selectivity

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  • Chen, Wan
  • Chen, Mengzijing
  • Yang, Mingke
  • Zou, Enbao
  • Li, Hai
  • Jia, Chongzhi
  • Sun, Changyu
  • Ma, Qinglan
  • Chen, Guangjin
  • Qin, Huibo

Abstract

Although a series of advanced technologies and materials, like ionic liquids and metal organic frameworks, is being developed for carbon capture, traditional techniques, like propylene carbonate (PC) washing, are still widely applied in industry because of their low material costs and ease of operation. Considering the low CO2 solubility and selectivity in PC, we have tried to improve the PC washing process by adding 2-methylimidazole (mIm) to PC in the presence of ethylene glycol (EG) as cosolvent. A series of EG-mIm-PC complex solvents was prepared and their viscosities measured at different temperatures. The absorption isotherms of CO2 in these complex absorbents, as well as in pure PC, were measured at 293.15, 303.15, and 313.15 K at 0.1–0.8 MPa. The heats of CO2 absorption in these solvent mixtures were calculated using the Clausius-Clapeyron equation. For evaluating the effect of mIm on the selectivity of CO2 over other gas species, the absorption isotherms of CH4, N2, and H2 in pure PC and in 24%-mIm complex solvent with highest CO2 solubility were also measured. The results showed that the viscosities of these complex absorbents, as well as the solubility and heats of absorption of CO2 in all of them, moderately or slowly increased with an increase in mIm mass fraction, when the mIm content was lower than 20 wt%, and rapidly increased when it surpassed 20 wt%. The CO2 solubility could be more than doubled when the mIm content reached 24 wt% while viscosity and absorption heat still remains at low levels, that is, lower than 14 mPa·s and 26 kJ/mol, respectively. More importantly, the solubilities of CH4, N2, and H2 drastically decreased in the presence of mIm; using the 24 wt%-mIm complex absorbent instead of pure PC, the selectivity of CO2 over those other gas species increased by: 0.7–2.8 times for CH4, 3.9–6.3 times for N2, and 3.5–7.7 times for H2, with more significant improvements at lower pressure ranges. This work presents a very promising approach to PC washing technology upgrading.

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  • Chen, Wan & Chen, Mengzijing & Yang, Mingke & Zou, Enbao & Li, Hai & Jia, Chongzhi & Sun, Changyu & Ma, Qinglan & Chen, Guangjin & Qin, Huibo, 2019. "A new approach to the upgrading of the traditional propylene carbonate washing process with significantly higher CO2 absorption capacity and selectivity," Applied Energy, Elsevier, vol. 240(C), pages 265-275.
    • Handle: RePEc:eee:appene:v:240:y:2019:i:c:p:265-275
    DOI: 10.1016/j.apenergy.2019.01.236
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    2. Yang, Ming-Ke & Han, Yu & Zou, En-Bao & Chen, Wan & Peng, Xiao-Wan & Dong, Bao-Can & Sun, Chang-Yu & Liu, Bei & Chen, Guang-Jin, 2020. "Separation of IGCC syngas by using ZIF-8/dimethylacetamide slurry with high CO2 sorption capacity and sorption speed but low sorption heat," Energy, Elsevier, vol. 201(C).

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