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Preparation of High Purity Ammonium Dinitramide and Its Liquid Mono-propellant

암모늄 디나이트라마이드염의 합성 및 액상연료화 연구

  • Kim, Wooram (Department of Applied Environmental Science, Kyung Hee University) ;
  • Park, Mijeong (Department of Applied Environmental Science, Kyung Hee University) ;
  • Kim, Sohee (Department of Applied Environmental Science, Kyung Hee University) ;
  • Jeon, Jong-Ki (Deparment of chemical engineering, Kongju National University) ;
  • Jo, Youngmin (Department of Applied Environmental Science, Kyung Hee University)
  • 김우람 (경희대학교 환경응용과학과) ;
  • 박미정 (경희대학교 환경응용과학과) ;
  • 김소희 (경희대학교 환경응용과학과) ;
  • 전종기 (공주대학교 화학공학과) ;
  • 조영민 (경희대학교 환경응용과학과)
  • Received : 2019.07.30
  • Accepted : 2019.08.29
  • Published : 2019.10.10

Abstract

A recently developed propellant, ammonium dinitramide (ADN, $NH_4N(NO_2)_2$ is stable and safe at an ambient condition. However, it requires high purity for practical applications. A very little quantity of foreign impurities in ADN may cause clogging of thruster nozzles and catalyst poisoning for the use of a liquid propellant. Thus, several purification processes for precipitated ADN particles such as repetition extraction, activated carbon adsorption and low-temperature extraction were presented in this study. The purifying methods helped to improve the chemical purity as evaluated by FT-IR and UV-Vis spectroscopy in addition to ion chromatography (IC) analyses. Among the purification processes, adsorption was found to be the best, showing a final purity of 99.8% based on relative quantification by IC. Thermal analysis revealed an exothermic temperature of $148^{\circ}C$ for the synthesized liquid monopropellant, but rose to $188^{\circ}C$ when urea was added.

Acknowledgement

Supported by : 한국연구재단

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