C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 251/60 (2006.01)
Patent
CA 2366585
Method for preparing melamine from urea via a high-pressure process in which solid melamine is obtained by transferring the melamine melt to an expansion vessel where the melamine melt is cooled by incorporated ammonia. Excess ammonia gas is added to the melamine melt to produce a gas/liquid mixture having a mass ratio of at least 0.01. This two-phase mixture is then sprayed via a spraying means into an expansion vessel, the expansion vessel having an ammonia environment with a reduced ammonia pressure. The melamine melt is cooled and solidified by the expansion and evaporation of the incorporated ammonia to form melamine powder. The melamine melt is thereby directly converted into a melamine powder after which the melamine powder is cooled further and the ammonia pressure is released.
L'invention concerne un procédé de préparation de la mélamine à partir de l'urée au moyen d'un processus haute pression, selon lequel on obtient de la mélamine solide en transférant la mélamine en fusion vers une cuve de dilatation dans laquelle elle est refroidie par l'inclusion d'ammonium. Le gaz ammoniac libre est ajouté à la mélamine en fusion pour produire un mélange gaz / liquide possédant un rapport de masse d'au moins 0,01. Le mélange en deux phases est ensuite pulvérisé au moyen d'un dispositif de pulvérisation dans la cuve de dilatation caractérisée par un environnement d'ammoniac à faible pression. La mélamine en fusion est refroidie et solidifiée par la dilatation et l'évaporation de l'ammoniac incorporé; on obtient ainsi de la poudre de mélamine. Ainsi, on transforme directement la mélamine en fusion en poudre de mélamine, après quoi on continue de refroidir la poudre de mélamine et l'on fait baisser la pression de l'ammoniac.
Dsm Ip Assets B.v.
Dsm N.v.
Fetherstonhaugh & Co.
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