An experimental and modeling study of physical N₂O solubility in 2-(ethylamino)ethanol

Physical N₂O solubility in pure 2-(ethylamino)ethanol (EAE) solvent was measured over the temperature range 289.6– 349.7 K. The physical solubility of CO₂ in EAE was then derived via the “N₂O analogy” method. The effect of structural characteristics such as carbon chain length, hydroxyl group, hydroxylmethyl group and amino group on the physical CO₂ solubility was revealed through the comparison of various amines to determine the most advantageous structure for high physical solubility. The physical heat of CO₂ absorption of the amine was correlated using Arrhenius equation to analyse the sensitivity of the solubility data to the temperature change. Likewise, physical N₂O solubility in aqueous EAE solution was measured from 289.6 to 349.7 K and EAE concentration from 7.5 to 75.0 wt%. To correlate the solubility data in a binary EAE-H₂O system, four mathematical models, polynomial, semi-empirical, Redlich-Kister equation and Arrhenius equation models were introduced with average absolute relative deviation (AARD) of 6.5%, 8.7%, 5.9% and 8.7%, respectively. A small extrapolation with respect to temperature at 283 and 363 K was made to further estimate the performance of these models.