Comparison of the crystals obtained by precipitation of CL-20 with different chemical purity
Paweł Maksimowski , Wincenty Skupiński , Joanna Szczygielska
AbstractThe 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 %.
|Journal series||Propellants, Explosives, Pyrotechnics, ISSN 0721-3115|
|Publication size in sheets||0.5|
|Keywords in English||hexanitrohexaazaisowurtzitane (HNIW or CL20), purification, precipitation|
|Score|| = 25.0, 01-02-2020, ArticleFromJournal|
= 25.0, 01-02-2020, ArticleFromJournal
|Publication indicators||= 4; = 4; : 2014 = 1.556; : 2013 = 1.497 (2) - 2013=1.663 (5)|
|Citation count*||1 (2015-08-24)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.