C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 251/60 (2006.01) C07D 251/62 (2006.01)
Patent
CA 2258162
The invention relates to a method for the preparation of melamine from urea via high-pressure process in which solid melamine is obtained by transferring the melamine melt leaving the melamine reactor to a cooling vessel where the melamine melt is cooled by means of liquid ammonia. The melamine melt is cooled to a temperature of between about 50 °C and about 350 °C by means of liquid ammonia, a mixture comprising ammonia and melamine being formed, after which all or part of this mixture is transferred to an expansion vessel, the composition being contacted with ammonia for about one minute to about five hours, following which solid melamine is liberated from the composition.
L'invention concerne un procédé de préparation de mélamine à partir d'urée à l'aide d'un processus haute pression permettant d'obtenir le la mélamine solide et consistant à transférer la fusion de mélamine quittant le réacteur de mélamine, dans une bac de refroidissement où on la refroidit au moyen d'ammoniaque liquide, afin que la fusion atteigne une température comprise entre environ 50 et environ 350 DEG C, un mélange comprenant de l'ammoniaque et de la mélamine se formant alors. Puis on transfère tout ou partie de ce mélange dans une cuve d'expansion, et on met en contact la composition avec de l'ammoniac pendant une période comprise entre environ une minute et cinq heures, à la suite de quoi on obtient une mélamine solide débarrassée de toutes les autres substances de la composition.
Dsm Ip Assets B.v.
Dsm N.v.
Fetherstonhaugh & Co.
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