Experimental Data and Modeling for Viscosity and Refractive Index of Aqueous Mixtures with 2‑(Methylamino)ethanol (MAE) and Aminoethylethanolamine (AEEA)

In the present study, the viscosity and refractive index of pure and aqueous 2-(methylamino)­ethanol (MAE) and aminoethylethanolamine (AEEA) and an aqueous blend of MAE and AEEA were measured in the temperature range of 293.15–333.15 K with an interval of 5 K at atmospheric pressure. Amine content in aqueous mixtures varied from 0.05 to 0.30 weight fraction. The viscosity of pure components was correlated by Arrhenius-type equation with average absolute deviation percentage (AAD%) values of 1.87 and 2.42 for MAE and AEEA, respectively. Modified Vogel–Tamman–Fulcher equation with AAD% of 1.343 was proposed to correlate the viscosity of pure AEEA. A new equation with respect to temperature was also proposed to correlate the refractive index data of pure MAE and pure AEEA. Viscosity and refractive index data of aqueous MAE, AEEA, and an aqueous blend of MAE and AEEA were associated by newly proposed correlations and maximum AAD% was found to be 0.11 and 0.001 for viscosity and refractive index, respectively. Deviation in viscosity (Δμ) and deviation in refractive index (Δn_D) from ideal solution of aqueous MAE and AEEA were correlated by the Redlich–Kister equation, and the maximum standard deviation was calculated to be 0.091 and 0.0012 for MAE and 0.114 and 0.0011 for AEEA, respectively.