Process for producing high-quality melamine from urea

Details Process for producing high-quality melamine from urea Process for producing high-quality melamine from urea

C - Chemistry, Metallurgy

07

D

C07D 251/60 (2006.01)

Patent

CA 2722963

A process for high--pressure, liquid phase conversion of urea into melamine is disclosed, where molten urea is fed to a first reaction zone (S1 ) where the melamine melt is under mechanical agitation, and a heat input (Q1 ) is provided to maintain the endothermic reaction, and the liquid is then passed to a second reaction zone (S2) kept at a lower temperature and where further agitation is provided. Embodiments of plants adapted to carry out the process are also disclosed, including multiple stirred reactors in cascade and a single reactor with multiple internal compartments defining said first and second reaction zones.

La présente invention concerne un procédé de conversion en phase liquide sous pression élevée de l'urée en mélamine. Selon ce procédé, l'urée fondue est chargée dans une première zone de réaction (S1) où la mélamine fondue est sous agitation mécanique, et un apport de chaleur (Q1) est fourni pour entretenir la réaction endothermique, et le liquide est ensuite transmis à une seconde zone de réaction (S2) gardée à une température plus faible et où une agitation est de nouveau fournie. L'invention concerne de plus des modes de réalisation dinstallations industrielles adaptées pour effectuer le procédé, comprenant de multiples réacteurs agités en cascade et un réacteur simple avec de multiples compartiments internes définissant lesdites première et seconde zones de réaction.

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