Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

In the present work, the solubilities of NH3 in deep eutectic solvents (DESs) formulated by ethylamine chloride (EaCl) and urea were determined at (313.2 to 353.2) K and (0 to 300.0) kPa. It is found that the isotherms for NH3 absorption display slightly non-ideal profiles, and EaCl contributes slightly more than urea to the absorption of NH3 in EaCl+urea mixtures. Overall, EaCl+urea mixtures possess quite promising absorption capacities for NH3, with the values of (4.179 to 4.573) mol*kg-1 at 313.2 K and ~100.0 kPa. The Krichevesky-Kasarnovsky (K-K) equation was used for the correlation of NH3 solubilities, and the Henry's constants and infinite-dilution partial molar volumes of NH3 in EaCl+urea mixtures were obtained. The thermodynamic functions of NH3 absorption process were also calculated based on the relationship between Henry's constants and temperatures. Considering that the physical properties are basic data for liquid solvents, the densities, viscosities, freezing temperatures, glass transition temperatures and melting temperatures of EaCl+urea mixtures at different temperatures were also determined.