Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Klaus-Dieter Thiel

Norbert Eisenreich

Walter Engel

Herbert Heinisch

In the production of spherulitic nitroguanidine having a high bulk and tap ensity nitroguanidine is dissolved in dipolar, aprotic solvents, e.g. DMF, DMSO, NMP, etc., by heating to above the saturation temperature t.sub.s and the supersaturated solution is cooled with a controlled temperature gradient (.degree.C./min), crystallization being assisted by the addition of particulate, spherulitic material. In order to obtain spherical nitroguanidine with high yield in a continuous process and with mother liquor reuse, during the heating to above the saturation temperature t.sub.s, spherical control particles with a diameter of 5 to 500 .mu.m are regularly added to the solution in a quantity of 0.05 to 5.00 mass %. The particle size is chosen in such a way that, as a function of the solution behaviour of the nitroguanidine used and its concentration, on dropping below the saturation temperature spherical control particles are still present in the indicated quantity in the supersaturated solution.

Process for the production of spherulitic particles

In a process for producing phase-stabilized ammonium nitrate (AN), a diammine complex of Ni or Cu is incorporated into the AN lattice, in which the diammine complex is produced in a solid-state reaction of AN and metal oxide at 110.degree. to 170.degree. C. and in a proportion of up to 10% is either mixed with further AN and melted, homogenized and subsequently transferred into the solid state, or mixed with further AN is incorporated into the AN lattice at between 80.degree. and 170.degree. C. in a solid-state reaction.

Growing community of inventors

Karlsruhe, Germany

Klaus-Dieter Thiel