Densities and viscosities for water-lean ternary mixtures of 2-butoxyethanol with monoethanolamine, 2-(methylamino)ethanol, 2-(ethylamino)ethanol or 2-(butylamino)ethanol from 293.15 to 353.15 K

Abstract

Water-lean absorbent has great potential in energy savings over aqueous amines for CO2 capture. Measurements on density and viscosity for the ternary systems of monoethanolamine (MEA), 2-(methylamino)ethanol (MAE), 2-(ethylamino)ethanol (EAE) or 2-(butylamino)ethanol (BAE) + 2-butoxyethanol (EGBE) + water have been performed at atmospheric pressure and temperatures from 293.15 to 353.15 K. The total amine concentrations in these systems were held at two constant mass fractions in the range of 30-60 mass%. Excess molar volume (VE) and viscosity deviation (Δη) of the ternary systems were also derived from the experimental data and correlated with Cibulka parameters with the aid of Redlich-Kister equation to fit the measured ternary properties from their pure components. The addition of water into the binary (amine +EGBE) systems can affect greatly the molecular interactions. The VE values of the ternary blends are found to be negative over the investigated conditions. However, Δη values are observed to be positive except in the rich (amine + EGBE) concentration region. The variations of VE and Δη were represented and interpreted with molecular interactions and structural effects.