Method for producing pure melamine

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 251/62 (2006.01) C07D 251/60 (2006.01)

Patent

CA 2350777

The invention relates to a method for producing pure melamine. According to this method, the melamine melt, which is produced from urea in a high-pressure process, is cooled and ammonia is added until it reaches a temperature of approximately 1 to 50 ~C above the melting temperature of the melamine as dependent on the respective pressure of ammonia and then either a) quenched with water or an aqueous solution or suspension containing ammonia and/or melamine so that the melamine solidifies or b) quenched with cold liquid or gaseous ammonia, so that the melamine solidifies, the melamine then being cooled further with water or an aqueous solution or suspension containing ammonia and/or melamine and c) the melamine is then isolated.

L'invention concerne un procédé de production de mélamine pure, selon lequel la mélamine en fusion produite à partir d'urée dans un procédé haute pression est refroidie par apport d'ammoniac à une température supérieure de 1 à 50 ·C au point de fusion de la mélamine, lequel est fonction de la pression respective d'ammoniac. Ensuite, a) on procède à un refroidissement par injection d'eau ou d'une solution ou suspension aqueuse contenant de l'ammoniaque et/ou de la mélamine, la mélamine étant solidifiée ou b) on procède au refroidissement par injection d'ammoniaque ou d'ammoniac froids, la mélamine étant solidifiée puis dans un deuxième temps davantage refroidie par de l'eau ou une solution ou suspension aqueuse contenant de l'ammoniaque et/ou de la mélamine et c) la mélamine est ensuite isolée.

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