Process for the production of spherulitic particles

Details Process for the production of spherulitic particles Process for the production of spherulitic particles

1996-10-07

1997-12-09

Nelson, Peter A.

Plastic and nonmetallic article shaping or treating: processes

Explosive or propellant article shaping or treating

Forming or treating particulate material

264 36, 149105, 149111, 564262, C06B 2100

Patent

active

056964072

ABSTRACT:
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.

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