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Particle size adjustment of spherical ammonium dinitramide particles (ADN-Prills) produced by emulsion crystallization

: Heintz, Thomas; Reinhard, Werner; Birke, Christoph; Leisinger, Karlfred

Fulltext urn:nbn:de:0011-n-3201668 (1.1 MByte PDF)
MD5 Fingerprint: 2936c6023b5140e9657c3738aa6b225d
Created on: 9.1.2015

Fraunhofer-Institut für Chemische Technologie -ICT-, Pfinztal:
Energetic Materials. Particles, Processing, Applications : 45th International Annual Conference of ICT, June 24 - 27, 2014, Karlsruhe, Germany
Pfinztal: Fraunhofer ICT, 2014
Fraunhofer-Institut für Chemische Technologie (International Annual Conference) <45, 2014, Karlsruhe>
Conference Paper, Electronic Publication
Fraunhofer ICT ()

During the last years the high performance, low signature and environmental friendly oxidizer ammonium dinitramide (ADN) gained more and more acceptance for defense and space applications. The application of ADN in solid propellant formulations leads to a requirement of spherical particles of two or three different particles sizes. Therefore a coarse particle size fraction in the range of 200-250 μm and medium particle size fraction in the range of 40-60 μm are demanded. A fine fraction of about 5 μm is desirable, but only producible by milling processes.
To achieve these requirements for coarse and medium size (spherical) particles several process parameters of the emulsion crystallization process for ADN, the so-called ADN-Prilling process, were modified. By the variation of process fluids, additives, stirring energy and recrystallization behavior it was possible to generate medium sized ADN-Prills with a mean particle size of 50 μm and coarse ADN-Prills with approx. 200 μm in technical scale. Furthermore targeted seeding during the recrystallization step proved to be a suitable parameter to adjust the particle size of ADN-Prills.