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CO2 capture performance and mechanism of blended amine solvents regulated by N-methylcyclohexyamine

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  • Wang, Rujie
  • Liu, Shanshan
  • Li, Qiangwei
  • Zhang, Shihan
  • Wang, Lidong
  • An, Shanlong

Abstract

Blended amine solvents are considered potential alternatives to monoethanolamine for CO2 capture, for the fast absorption kinetics of primary/secondary amine and low regeneration penalty of tertiary amine. In this research, blended amine solvents comprising N,N-dimethylcyclohexylamine (DMCA) and N-methylcyclohexyamine (MCA) were proposed. CO2 absorption increased the polarity of the products and ensured the absorbent remained homogenous throughout the absorption/desorption cycles. Through quantum chemical calculation, the low stability of MCA-carbamate was confirmed by a ΔΔG3 value of −6.41 kcal/mol, and a possible reaction route from carbamate to bicarbonate was revealed. Thus, the CO2 capacity of DMCA-MCA reached 0.875–0.985 mol CO2/mol amine. Moreover, MCA exhibited considerably low forward energy barrier for zwitterion formation (2.7 kcal/mol), and the CO2 absorption of DMCA could be accelerated through the proton transfer reaction with the MCA-zwitterion. Accordingly, the total mass transfer coefficient of CO2 in DMCA-MCA approached 2.02 × 10−10 mol/cm2 s Pa, which was 1.2-fold higher than that of 5 M MEA. The total regeneration energy of DMCA-MCA blend was estimated at 2.20 GJ/t CO2, which was 44.9% lower than 5 M MEA. This study developed a novel DMCA-MCA blended solvent with rapid absorption rate, huge CO2 capacity and efficient regeneration for CO2 capture.

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  • 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).
    • Handle: RePEc:eee:energy:v:215:y:2021:i:pb:s0360544220323161
    DOI: 10.1016/j.energy.2020.119209
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    6. Liu, Xuebing & Niu, Xiaowei & Zhan, Guoxiong & Xing, Lei & Huang, Zhoulan & Yuan, Bingling & Peng, Yue & Chen, Zhen & Li, Junhua, 2024. "Dynamic phase-splitting behaviour of biphasic solvent for carbon capture in a novel annular phase separator," Applied Energy, Elsevier, vol. 360(C).
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