Optimal Technical Conditions of Preparing Spherical Nitroguanidine by Uniform Design

Optimal technical conditions of preparing spherical nitroguanidine(NQ) had been obtained by adopting uniform design experimentation, and the spheral nitroguanidine with higher bulk density had been prepared. In the non-aqueous-solvent process of spherical nitroguanidine preparation, adding a certainty of NQ crystallization control particles into the mother liquor make the residual solution(mother liquor) reuse. The NQ crystallization control particles must be spherical, its particle size and adding quantity also must be limited in a certain range and technical conditions must be controlled in the state of crystallization of mother liquor. The technical conditions were optimized as follows: particle size and adding quantity of NQ crystallization control particles were 70-100 μm and 0.5% respectively, cooling rate of super-saturation solution was 3.5 ℃/min. The prepared spherical nitroguanidine particle had regular shape and smooth surface. Its bulk density and vibro-compacted density might reach 1.01 g/cm~3 and 1.13 g/cm~3 respectively.