Abstract
Although the solid propellant, ammonium dinitramide (ADN, NH4N(NO2)2) is safe and thermally stable, it requires high purity for practical commercial applications. Even a small amount of impurities in ADN can create negative effects, including catalyst poisoning and thruster nozzle cloggings when it is used as a liquid propellant. Thus, we explored several purification processes for the precipitated ADN particles, such as repetition extraction, adsorption by activated carbons, and low-temperature extraction. These purifying methods help to improve the chemical purity as evaluated by FTIR, UV-vis, DSC, and IC analyses. Among the purification processes, adsorption was found to be the best method, showing a final purity of 99.768% based on relative quantification by ion chromatography.
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Kim, W., Kwon, Y., Hwang, S.Y. et al. Comparative evaluation of purity of green energetic material (ammonium dinitramide) depending on refining method. Korean J. Chem. Eng. 34, 1693–1698 (2017). https://doi.org/10.1007/s11814-017-0072-7
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DOI: https://doi.org/10.1007/s11814-017-0072-7