Method for producing solid melamine

Details Method for producing solid melamine Method for producing solid melamine

C - Chemistry, Metallurgy

07

D

C07D 251/62 (2006.01)

Patent

CA 2361941

The invention relates to a method for producing solid melamine by expanding liquid, ammoniacal melamine which is mixed with excess ammonia, whereby a dispersion is produced. Said dispersion is expanded, optionally after it has been held under ammonia pressure, whereby solid melamine is deposited. The solid melamine is optionally held under ammonia pressure. Expansion is then optionally carried out in any particular order, along with cooling to room temperature and the pure melamine is isolated.

Cette invention concerne un procédé de production de mélamine solide par la détente de mélamine liquide contenant de l'ammoniac. Selon ce procédé, la mélamine liquide contenant de l'ammoniac est mélangée à de l'ammoniac en excès pour former une dispersion, et la dispersion, sur laquelle on a éventuellement laissé agir la pression de l'ammoniac, est détendue, la mélanine se trouvant alors en partie sous forme solide. Eventuellement, on laisse agir un certain temps la pression de l'ammoniac sur la mélamine solide. Finalement, on continue éventuellement la détente par phases successives aléatoires, on ramène à la température ambiante et on isole la mélamine solide.

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