Method for preparing melamine

Details Method for preparing melamine Method for preparing melamine

C - Chemistry, Metallurgy

07

D

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

Patent

CA 2331597

Method for preparing melamine from urea via a high-pressure process in which solid melamine is obtained by transferring the reactor product comprising liquid melamine, CO2 and NH3 to a gas/liquid separator and subsequently transferring the melamine melt coming from the separator to a vessel where the melamine melt is cooled with an evaporating cooling medium, characterized in that, the gas/liquid separation is conducted by addition of 5.10 -4 - 2.10 -2 mole of water per mole of melamine.

Cette invention concerne un procédé qui permet de préparer de la mélamine à partir d'urée. On utilise un processus à haute pression au cours duquel la mélamine solide est obtenue en transférant le produit du réacteur, qui contient de la mélamine liquide, du CO2 et du NH3, vers un séparateur de gaz et de liquides. La mélamine fondue provenant du séparateur est ensuite transférée vers un récipient où elle est refroidie à l'aide d'un milieu de refroidissement par évaporation. Cette invention se caractérise en ce que la séparation gaz/liquides se fait en ajoutant de 5.10<-4> à 2.10<-2> mole d'eau par mole de mélamine.

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