Comparison of the crystals obtained by precipitation of CL-20 with different chemical purity

Paweł Maksimowski , Wincenty Skupiński , Joanna Szczygielska


The precipitation of CL-20 with different chemical purity is presented herein. Studies have shown that the first crystallization of the crude CL-20 does not allow achieving the expected polymorphic purity and slightly increases chemical purity. Further precipitation processes result in gradual increase of the chemical purity about 1–2 % and in the improvement of the properties of crystals, i.e. density, polymorphic purity, and sensitivity to friction. This paper attempts a preliminary purification of the crude CL-20 with columns filled with activated charcoal. A material of high purity, obtained by this process, was used in the process of precipitation. As a result of the crystallization a sample of CL-20 was obtained with high chemical purity of 99.5 % and significantly reduced sensitivity to friction (128 N) and to impact (4 J). Additionally, samples of CL-20, recovered from the filtrate after crystallization with a chemical purity of about 88 %, were purified on columns filled with activated charcoal. In this process a significant amount of impurities was removed and the purity was increased to 96 %.
Author Paweł Maksimowski (FC / DH-EM)
Paweł Maksimowski,,
- Department Of High-Energetic Materials
, Wincenty Skupiński (FC / DH-EM)
Wincenty Skupiński,,
- Department Of High-Energetic Materials
, Joanna Szczygielska (FC / DH-EM)
Joanna Szczygielska,,
- Department Of High-Energetic Materials
Journal seriesPropellants, Explosives, Pyrotechnics, ISSN 0721-3115
Issue year2013
Publication size in sheets0.5
Keywords in Englishhexanitrohexaazaisowurtzitane (HNIW or CL20), purification, precipitation
ASJC Classification1500 General Chemical Engineering; 1600 General Chemistry
Languageen angielski
propellantsexplosivespyrotechnics_2013_38_791.pdf 292.87 KB
Score (nominal)25
Score sourcejournalList
ScoreMinisterial score = 25.0, 01-02-2020, ArticleFromJournal
Ministerial score (2013-2016) = 25.0, 01-02-2020, ArticleFromJournal
Publication indicators Scopus Citations = 4; WoS Citations = 4; Scopus SNIP (Source Normalised Impact per Paper): 2014 = 1.556; WoS Impact Factor: 2013 = 1.497 (2) - 2013=1.663 (5)
Citation count*1 (2015-08-24)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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