A complete study of thermophysical properties concerning the 2-(2diethylaminoethoxy)ethanol (DEAE-EO) + water binary system is realized. Density, speed of sound, dynamic and kinematic viscosities and refractive index measurements have been performed at atmospheric pressure, using a vibrating tube densitometer, a falling ball viscosimeter, and a refractometer, for pure DEAE-EO, pure water, and for aqueous solutions of DEAE-EO, from 278.15 to 323.15 K. The thermal expansion was calculated from density data. Excess Gibbs energy of flow and the corresponding excess entropy of flow were also calculated considering dynamic viscosity and density data. Excess molar properties (volume, isobaric expansion coefficient, Gibbs energy of flow and square of refractive index) were calculated and the Redlich-Kister equations were applied to correlate the data. Thermophysical properties of aqueous DEAE-EO (50 mol%) and Methyldiethanolamine (MDEA) (50 mol%) solutions were compared for their application in absorption of acid gases.