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<p>Deep eutectic solvents (DESs) are promising green CO<sub>2</sub> absorbents due to their low vapor pressure, high designability, and environmental friendliness. In this work, diethylamine hydrochloride (DH) was used as the hydrogen bond acceptor (HBA), and ethylene glycol (EG) and diethylene glycol (DEG) as the hydrogen bond donors (HBDs). Six homogeneous, room-temperature-stable DESs were synthesized at HBA: HBD molar ratios from 1:4 to 1:6. Their densities and viscosities were measured at 303.15–333.15&#xa0;K, and CO<sub>2</sub> solubilities were determined at pressures of 0.206–2.310&#xa0;MPa. A soft‑SAFT thermodynamic model was established to correlate the densities, and a temperature–dependent binary interaction parameter was introduced to correlate CO<sub>2</sub> solubilities. The improved free volume theory (FVT) was coupled to achieve accurate viscosity calculation. The average absolute relative deviations for density, CO<sub>2</sub> phase equilibrium, and viscosity were 0.028%, 2.15%, and 0.77%, respectively, demonstrating excellent predictive accuracy and extrapolation capability. All DESs exhibited mass losses below 1% below 100&#xa0;°C, and the capacity decay of the optimal absorbents after three cycles was less than 7%, indicating both excellent thermal stability and cyclic stability.</p>

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Diethylamine Hydrochloride-Based Deep Eutectic Solvents for CO2 Capture: Experimental Characterization and soft-SAFT Thermodynamic Modeling

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Derui Li,
  • Qiang Zheng,
  • Fuxin Yang,
  • Houzhang Tan,
  • Xiaopo Wang

摘要

Deep eutectic solvents (DESs) are promising green CO2 absorbents due to their low vapor pressure, high designability, and environmental friendliness. In this work, diethylamine hydrochloride (DH) was used as the hydrogen bond acceptor (HBA), and ethylene glycol (EG) and diethylene glycol (DEG) as the hydrogen bond donors (HBDs). Six homogeneous, room-temperature-stable DESs were synthesized at HBA: HBD molar ratios from 1:4 to 1:6. Their densities and viscosities were measured at 303.15–333.15 K, and CO2 solubilities were determined at pressures of 0.206–2.310 MPa. A soft‑SAFT thermodynamic model was established to correlate the densities, and a temperature–dependent binary interaction parameter was introduced to correlate CO2 solubilities. The improved free volume theory (FVT) was coupled to achieve accurate viscosity calculation. The average absolute relative deviations for density, CO2 phase equilibrium, and viscosity were 0.028%, 2.15%, and 0.77%, respectively, demonstrating excellent predictive accuracy and extrapolation capability. All DESs exhibited mass losses below 1% below 100 °C, and the capacity decay of the optimal absorbents after three cycles was less than 7%, indicating both excellent thermal stability and cyclic stability.