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Formation of particles of explosives with supercritical fluids

: Teipel, U.; Förter-Barth, U.; Krause, H.; Gerber, P.


Propellants, explosives, pyrotechnics 22 (1997), No.3, pp.165-169
ISSN: 0340-7462
ISSN: 0721-3115
ISSN: 1521-4087
Journal Article
Fraunhofer ICT ()

Different processes to form particles of explosives and propellants with supercrit. fluids such as the RESS-, the PCA-, and the GAS process are explained, and first results are presented. Esp. with regard to insensitive explosives, the formation of crystals without spots, i.e. free of solvent inclusions, is aspired. For the RESS process (rapid expansion of supercrit. solns.), the formation of particles results from the rapid expansion of a loaded supercrit. fluid. The GAS process (gas anti-solvent) uses a high-compressed fluid as anti-solvent to lower the solvent power of a common solvent and thus to recrystallize the solid. In the PCA process (pptn. with a compressed fluid anti-solvent) the soln. and the compressed gas are simultaneously injected into the crystallizer in counter-current flow. The processes have significant advantages for the particle formation of sensitive energetic materials due to the moderate operation conditions (temp. and pressure) if CO2 is used as solvent or as anti-solvent. The variation of pressure and temp. allow to control the morphol. of the recrystd. solid particles in a wide range. It is possible to produce cryst. particles with a small size and a narrow size distribution without spots.