Process for preparing melamine from urea

Details Process for preparing melamine from urea Process for preparing melamine from urea

C - Chemistry, Metallurgy

07

D

C07D 251/60 (2006.01) C07B 63/00 (2006.01)

Patent

CA 2398986

Process for preparing melamine from urea at elevated temperature and in the presence of a catalyst, in which a gaseous product stream is obtained which is contacted with a liquid coolant in a cooling zone and in which a proportion of the concentrated aqueous carbamate solution from the absorption zone is returned to the cooling zone.

La présente invention concerne un procédé de préparation de mélamine à partir d'urée, à une température élevée et en présence d'un catalyseur. Selon ce procédé, un flux de produit gazeux obtenu est mis en contact avec un liquide de refroidissement, dans une zone de refroidissement, et une partie de la solution de carbamate aqueuse concentrée, issue de la zone d'absorption, est de nouveau conduite à la zone de refroidissement.

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