Density, viscosity and excess properties for binary mixtures of 2-(ethylamino)ethanol and 2-(butylamino)ethanol with 2-butoxyethanol at temperatures from (293.15 to 353.15) K

Abstract

Nonaqueous amine-based blends have great potential for energy-efficient CO2 absorbent. In this work, densities and viscosities were measured for liquid binary mixtures of 2-(ethylamino)ethanol (EAE) and 2-(butylamino)ethanol (BAE) with 2-butoxyethanol (EGBE) at temperatures of (293.15–353.15)K over the entire concentration range and atmospheric pressure. Intermolecular interactions between EGBE and two secondary amines with different carbon chain length were discussed. The excess molar volume (VE), viscosity deviations (∆η) and excess Gibbs free energy (∆G⁎E) were calculated from the experimental data and also correlated with the Redlich-Kister equation to estimate the binary interaction parameters. The experimental data and the calculated from the proposed correlations for the studied binary mixtures matched well each other, with AADs within 0.01% and 1.45% for density and viscosity respectively. The variation of excess properties was also discussed in terms of intermolecular interactions. Weak interactions on mixing these binary mixtures with different mass fractions were observed from the FTIR spectra analysis.