Viscosities and Excess Properties of Aqueous Solutions of Ethanolamines from 25 to 80°C

Viscosities of aqueous solutions of monoethanolamine and triethanolamine have been measured from 25 to 80°C over the entire range of concentrations. The excess Gibbs energies for viscous flow have been calculated for aqueous solutions of monoethanolamine, triethanolamine, and also for diethanolamine and methyldiethanolamine from our earlier work J. Chem. Eng. Data 39, 290 (1994)]. The entropy of viscous flow was obtained by using the temperature dependence of the excess Gibbs energy for viscous flow. The structural effects on the viscosity, excess Gibbs energy, and entropy for viscous flow are discussed.