摘要
The influence of water content on the physicochemical properties of the H 2 O + (polyethylene glycol 300 (PEG300) + hydroxyethyl ethylenediamine (AEEA)) mixed system was investigated in detail. Density ( ρ ) and viscosity ( η ) were systematically measured over the temperature range of 298.15 K to 318.15 K under atmospheric pressure, and electrical conductivity was determined at 298.15 K. Based on the experimental data, excess molar volume ( V m E ), excess Gibbs free energy of activation for viscous flow ( ΔG ⁎E ), and viscosity deviation ( Δη ) were calculated to reveal the variations in intermolecular interactions. Subsequently, the formation of intermolecular hydrogen bonds, primarily characterized by H 2 O···HNH- interactions, had been further confirmed through spectroscopic analyses, including Fourier-transform infrared (FTIR) and Raman spectroscopy. The CO 2 absorption performance of different mixed system was systematically investigated under varying gas flow rates and water concentrations. The results demonstrated that the mixed system with higher water content exhibited optimal CO 2 absorption capacity at elevated gas flow rates, reaching a maximum absorption of 1.11 mol CO 2 /mol AEEA. Cyclic absorption experiments were further conducted, and graphic characterizations, including Raman spectroscopy, infrared spectroscopy, and 13 C NMR, were utilized to analyze the CO 2 absorption process of the H 2 O + (PEG300 + AEEA) mixed system over time. It was found that the byproducts N-hydroxyethyl-2-imidazolidinone (HEIA) and 3-(2-hydroxyethyl)-2-oxazolidinone (HEOD), formed during the cycles, were the primary contributors to the decline in absorption capacity. As the number of cycles increased, the mixed system gradually reached a new chemical equilibrium, with absorption performance stabilizing. These findings offered valuable theoretical insight for the optimization of absorbent systems.
危险品化学品经营许可证（带存储）