Process for the preparation of pure melamine

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

C - Chemistry, Metallurgy

07

D

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

Patent

CA 2239542

The invention concerns a process for producing pure melamine in which liquid, ammonia-containing melamine is rapidly expanded from an ammonia partial pressure p1 of between 400 and 50 bar to an ammonia partial pressure p2 of between 200 bar and atmospheric pressure at a temperature which is between 0 and 60 °C above the fixed point of the melamine which is dependent on the prevailing ammonia partial pressure in each case, higher pressures permitting a greater margin of the temperature from the fixed point of the melamine than lower pressures, and p1 always being greater than p2. As a result thereof, pure melamine is deposited in solid form. Further expansion of the melamine to atmospheric pressure, if necessary, and cooling to room temperature are then carried out in any order and the pure melamine is isolated.

L'invention concerne un procédé pour produire de la mélamine pure, dans lequel de la mélamine liquide ammoniaquée subit une détente rapide d'une pression partielle d'ammoniac p1 comprise entre 400 et 50 bars à une pression partielle d'ammoniac p2 comprise entre 200 bars et la pression atmosphérique, à une température se situant entre 0 et 60 DEG C au-dessus du point fixe de la mélamine qui est fonction de la pression partielle d'ammoniac régnante dans chaque cas, des pressions supérieures permettant un plus grand écart de la température par rapport au point fixe de la mélamine que des pressions inférieures, et p1 étant toujours supérieur à p2. Par suite, de la mélamine pure se dépose sous forme solide. Une nouvelle détente de la mélamine à la pression atmosphérique, le cas échéant, et un refroidissement à température ambiante sont ensuite effectués dans n'importe quel ordre, et la mélamine pure est isolée.

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