Process for producing high-quality melamine from urea

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(57) Abstract : A process for highpressure, liquid phase conversion of urea into melamine is disclosed, where molten urea is fed to a first re- 20 action zone (S 1 ) where the melamine 2b-- 5 25 melt is under mechanical agitation, and a heat input (Q 1 ) is provided to maintain the endothermic reaction, and the liquid is then passed to a second reaction zone ($2) 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.