Physicochemical properties and CO2 absorption performance of poly(ethylene glycol) 300 + hydroxyethyl ethylenediamine mixed solution

• Published in: Journal of molecular liquids Vol. 408; p. 125300
• Main Authors: Fu, Xupeng, Wang, Yuting, Wang, Xiaoyu, Chai, Liming, Wang, Enna, Wu, Zhaojun, Zhang, Jianbin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.08.2024
• Subjects: AEEA; CO2 absorption; Intermolecular interaction; PEG300; PEG300; Intermolecular interaction; CO2 absorption; AEEA
• ISSN: 0167-7322
• DOI: 10.1016/j.molliq.2024.125300

•Densities and excess volumes for PEG300 + AEEA system.•Viscosities and viscosity deviation for PEG300 + AEEA system.•Absorption mechanism of CO2 in PEG300 + AEEA system.•Intermolecular interaction in PEG300 + AEEA system. Density (ρ) and viscosity (η) data of the polyethylene glycol 300 (PEG300) and hydroxyethyl ethylenediamine (AEEA) mixed solution were measured at P = 1005 hPa and T = (298.15–318.15) K. Following these data, Jouyban-Acree model exhibited superior correlation to density in the mixed system compared to nonlinear least square method, while the McAllister four-body equation yielded a better fitting for kinematic viscosity than other models. Utilizing ρ and η data, the Redlich-Kister equation was employed for the systematic computation and analysis of excess molar volume (VmE), excess activation Gibbs free energy (ΔG*E), partial molar volumes (V1¯ and V2¯), and viscosity deviation (Δη) in the PEG300 (1) + AEEA (2) mixed solution. These excess properties indicated the advantageous nature of intermolecular binding in the PEG300 (1) + AEEA (2) mixed solution, further substantiated on the basis of various spectroscopic characterizations. Finally, under conditions of CO2 flow rate at 150 mL/min, absorption experiments were conducted for 4 h in the PEG300 (1) + AEEA (2) mixed solution, pure AEEA, and pure PEG300, which indicated that the mixed solution exhibited the highest CO2 absorption capacity of 0.95 mol CO2/mol AEEA, demonstrating superior absorption performance compared to the two pure substances.