Process for the preparation of melamine

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 251/60 (2006.01) C07D 251/56 (2006.01)

Patent

CA 2386219

Process for the preparation of melamine comprising a reaction step, a gas/liquid separation step in which a melamine melt is separated from off-gases, a stripping step and a cooling step, in which the stripping step is carried out at a pressure of between MPa and 17 MPa and a temperature of between 330°C and 450°C and in which the melamine melt obtained in the preceding steps is pressurised in the cooling step to a pressure of between 15 and 35 MPa, with the pressure in the cooling step being higher than the pressure in the stripping step and with the temperature in the cooling step being adjusted between the melting point of the urea melt at the prevailing pressure and 365°C.

L'invention concerne un procédé relatif à l'élaboration de mélamime, qui comprend une phase de réaction, une phase de séparation gaz/liquide dans laquelle de la mélamime fondue est séparée des effluents gazeux, une phase d'entraînement et une phase de refroidissement. La phase d'entraînement est conduite à une pression comprise entre 5 MPa et 17 MPa et à une température comprise entre 330 DEG C et 450 DEG C, et la mélamime fondue résultant des phases précédentes est soumise dans la phase de refroidissement à une pression comprise entre 15 et 35 MPa, sachant que la pression dans la phase de refroidissement est supérieure à la pression dans la phase d'entraînement et que la température dans la phase de refroidissement est ajustée entre le point de fusion de l'urée en fusion à la pression courante et à une température de 365 DEG C.

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