Excess properties, intermolecular interactions, and CO2 absorption property of ethylene glycol + diethylenetriamine binary solutions

Abstract

In this work, the density (ρ) and viscosity (η) data of ethylene glycol (EG) + diethylenetriamine (DETA) binary solutions at T = 298.15 K–318.15 K and P = 100.5 kPa are reported. The basic physicochemical data of binary solutions were used to investigate their excess molar volume (VmE), viscosity deviation (Δη), and excess viscous flow activation Gibbs free energy (ΔG*E), which revealed that there was strong intermolecular interaction in the EG (1) + DETA (2) binary solutions. The density values, viscosity values, and excess properties of binary solutions were fitted by parametric models, such as Jouyban-Acree model, McAllister four-body model, and Redlich-Kister (R-K) equation. After that, the binary solutions were spectroscopically analyzed to further discuss their intermolecular interaction. Meanwhile, Raman, UV, and 1H NMR spectra jointly demonstrated the intermolecular hydrogen bonding of the binary solutions as the form of –OH···N(H2)–. Finally, CO2 absorption was carried out to investigate the CO2 absorption property of the binary solutions, which provided reference data for CO2 capture.