Viscosity and Mass Diffusion Coefficient of Ammonia/Ethylammonium Nitrate Mixtures

摘要

Ethylammonium nitrate shows an enhanced ammonia solubility due to the formation of strong hydrogen bonds.This protic ionic liquid also shows negligible vapour pressure and shares many properties with water. Theseattractive features make it interesting to study the mixtures of ethylammonium nitrate with ammonia forabsorption refrigeration systems.This paper reports new experimental data for viscosity and mass diffusion coefficient inammonia/ethylammonium nitrate mixtures. Measurements were performed using a piston-type viscometer forviscosity, and Optical Digital Interferometry for diffusion coefficients. Viscosity measurements wereperformed at temperatures between 293.15 K and 353.15 K, over a wide concentration range. Diffusionmeasurements of ammonia in the ionic liquid were performed at 293.15 K and 303.15 K. Viscosity data andthe mass diffusion process were described using a semi-empirical correlation and a non-equilibrium model,respectively. The models show an acceptable deviation from experimental data.