Crystallization of Ammonium-Perchlorate from Solution of Electrolytically Produced Sodium-Perchlorate in a Pilot- Scale Plant

Large scale application of ammonium-perchlorate in the composite rocket fuels defines this compound as an important strategic material. The high content of oxygen in ammonium-perchlorate (54.5 % w/w) and the fact that during the thermal decomposition does not yield solid residue, determines its application as an exceptional and irreplaceable oxidative compound in the composite rocket fuels. The fraction of ammonium-perchlorate in the composite rocket fuels is usually around 70-75 % w/w, while the energetic performances of the fuel are increased even for 50% compared to the conventional fuels. Based on these facts, and especially due to the specificity and needs of its own production process, in company ‘’19. December’ ’ AD, Podgorica, Montenegro, is initiated production of ammonium-perchlorate on a semi-industrial scale, with original solutions for the crystallization of ammonium-perchlorate, which is a key step in production of this compound. The core reaction in the process of crystallization is the reaction of double exchange: NaClO4 + NH4Cl → NH4ClO4 + NaCl First, the technological parameters of sodium-perchlorate production from sodium-chlorate by electrolytic reaction are investigated, followed by definition of key crystallization parameters in the system: NH4ClO4 – NaCl – H2O. As a result of the crystallization, the product is obtained, which satisfies known and valid standards, especially from the point of granulation, crystal shape, moisture content and crystal packing density