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<p>The impact of water on the physicochemical properties and CO<sub>2</sub> absorption capability of the <i>N</i>-methyldiethanolamine (MDEA) + polyethylene glycol 300 (PEG300) solution was explored. The molar ratio of PEG300 to MDEA was fixed at 0.3734: 0.6266, and the density and viscosity of the aqueous solutions were measured at<i> P</i> = 100.5 kPa and <i>T</i> = (298.15–318.15) K. Based on these measurements, the excess properties of the system were calculated. Meanwhile, spectral analysis confirmed the formation of intermolecular hydrogen bonds among MDEA, PEG300, and H₂O. Building on these findings, the influence of water content on the cyclic CO<sub>2</sub> absorption performance of the H₂O + (PEG300 + MDEA) system was systematically investigated, with particular emphasis on the regeneration behavior at 15 wt% MDEA concentration. Furthermore, the underlying mechanism of the cyclic CO₂ absorption process was elucidated using multiple analytical techniques. These insights provide certain theoretical support for the industrial application of PEG300 + MDEA aqueous systems in CO<sub>2</sub> capture.</p>

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Physicochemical Properties, Intermolecular Interactions and CO2 Absorption Performance of N-Methyldiethanolamine + Polyethylene Glycol 300 + Water Solution

  • 期刊论文

  • 发表日期：

    2025年10月11日

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  • Yuting Wang,
  • Min Wang,
  • Xupeng Fu,
  • Wenxue Wang,
  • Liming Chai,
  • Enna Wang,
  • Xionghui Wei,
  • Zhaojun Wu,
  • Jianbin Zhang

摘要

The impact of water on the physicochemical properties and CO2 absorption capability of the N-methyldiethanolamine (MDEA) + polyethylene glycol 300 (PEG300) solution was explored. The molar ratio of PEG300 to MDEA was fixed at 0.3734: 0.6266, and the density and viscosity of the aqueous solutions were measured at P = 100.5 kPa and T = (298.15–318.15) K. Based on these measurements, the excess properties of the system were calculated. Meanwhile, spectral analysis confirmed the formation of intermolecular hydrogen bonds among MDEA, PEG300, and H₂O. Building on these findings, the influence of water content on the cyclic CO2 absorption performance of the H₂O + (PEG300 + MDEA) system was systematically investigated, with particular emphasis on the regeneration behavior at 15 wt% MDEA concentration. Furthermore, the underlying mechanism of the cyclic CO₂ absorption process was elucidated using multiple analytical techniques. These insights provide certain theoretical support for the industrial application of PEG300 + MDEA aqueous systems in CO2 capture.