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• Physical properties for the PEG 200 and 1,2-PDA system. • Excess volumes values and property deviations proved intermolecular forces for the PEG 200 and 1,2-PDA system. • Hydrogen bonding of the PEG 200 and 1,2-PDA system were confirmed by FTIR, UV–vis and Fluorescence spectra. • This work enriches significant physical property parameters for industrial applications. • This work provides theoretical evidence for inhibiting amine volatilization during CO 2 capture by alcohol-amine system. In this work, density(ρ) and viscosity(η) of polyethylene glycol 200(PEG 200) and 1,2-propanediamine(1,2-PDA) system were measured at temperature from 293.15 to 318.15 K with temperature difference about 5 K under atmospheric pressure condition. In accordance with ρ and η , the excess molar volume (V m E), the thermal expansion coefficient(α p), viscosity deviation(Δη), and the viscosity activation free energy(ΔG*E) were computed and corrected with Redlich-Kister(R-K) equation. In addition, the viscosity values of PEG 200 and 1,2-PDA system were fitted with the three-body McAllister semi-empirical models. The intermolecular interactions between PEG 200 and 1,2-PDA were analyzed by FTIR, UV–vis, and Fluorescence spectral results, which were intermolecular hydrogen bond, and the interaction mode was expressed as follow: CH 3 CH(NH 2) CH 2 (H 2)N⋯H-OCH 2 CH 2 -. According to the data of V m E and ΔG*E , it is known that when the molar ratio of PEG to 1,2-PDA was about 1:1, the interaction is strongest. Theoretically, CO 2 capture absorption with this system can effectively inhibit the volatilization of amines. [ABSTRACT FROM AUTHOR]

The density (ρ), viscosity (η) and surface tension (γ) of 1, 3-propanediamine (1, 3-PDA) and tetraethylene glycol (T 4 EG) binary mixtures at different temperatures (T = 293.15–318.15 K) were measured. Based on the density data, the excess molar volume (V m E ), partial molar volume (V ¯ m , i), the excess Gibbs free energy (∆G ⁎E ) and thermal expansion coefficient (α p) of binary mixtures were calculated. Viscosity values (η) can be used to analyze the friction between fluids, and can be used in the design and application of chemical process equipment. Surface tension (γ) can be used to analyze intermolecular forces. The results were fitted to the Redli-Kister (RK) equation. The excess properties were analyzed from interaction at T 4 EG (1) + 1, 3-PDA (2) binary mixtures. According to the Gaussian calculation, the hydrogen bonding with 1.2 Å −3.0 Å bond length occurred in binary mixtures attributed to the positive dissociation energy of the binary mixtures. The results were further confirmed by FTIR and UV–vis and fluorescence spectra, the hydrogen bonds interaction mode was described as following: ⋯HOC 2 H 4 OC 2 H 4 OC 2 H 4 OC 2 H 4 OH⋯N(H 2)C 3 H 6 (H 2)N⋯. • Densities and excess volumes for the T 4 EG (1) + 1, 3-PDA (2) binary system. • Viscosities and viscosity deviation for the T 4 EG (1) + 1, 3-PDA (2) binary system. • surface tension and surface tension deviation for the T 4 EG (1) + 1, 3-PDA (2) binary system. • Intermolecular interaction analyzed as·HOC 2 H 4 OC 2 H 4 OC 2 H 4 OC 2 H 4 OH···N(H 2)C 3 H 6 (H 2)N···. • This work enriches the thermodynamic database, but also provides the reference for its application in chemical industry. [ABSTRACT FROM AUTHOR]