Process for the preparation of melamine

Details Process for the preparation of melamine Process for the preparation of melamine

C - Chemistry, Metallurgy

07

D

C07D 251/60 (2006.01) B01J 2/02 (2006.01) B05B 9/00 (2006.01) C07D 251/62 (2006.01)

Patent

CA 2306511

Process for the preparation of melamine from urea via a high-pressure process in which dry melamine powder is obtained by transferring the melamine melt leaving the reactor to a vessel in which the melamine melt is cooled by means of ammonia characterized in that the melamine melt is sprayed into a cooling vessel and cooled by droplets of evaporating liquid ammonia which is sprayed into the same cooling vessel at a pressure above 0.1 MPa and a temperature between 50 °C and the melting point of the melamine in the cooling vessel.

L'invention concerne un procédé à haute pression permettant d'élaborer de la mélamine à partir d'urée. On obtient ainsi de la poudre de mélamine sèche par transfert de la mélamine en fusion quittant le réacteur, vers un récipient où cette mélamine en fusion est refroidie par de l'ammoniac. L'opération est caractérisée en ce que la mélamine en fusion est pulvérisée dans un récipient de refroidissement et refroidie par des goutelettes d'ammoniac liquide en évaporation, également pulvérisé dans le même récipient, à une pression excédant 0,1 MPa et à une température comprise entre 50 DEG C et le point de fusion de la mélamine dans le récipient de refroidissement considéré.

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