Integrated process for urea and melamine production

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 273/12 (2006.01)

Patent

CA 2667956

In an integrated process for urea and melamine production, urea is produced in a urea plant (10) comprising a high pressure urea synthesis section (11) from which an aqueous solution comprising urea, ammonium carbonate and ammonia is obtained and a urea recovery section (21) operating at low pressure, and melamine is produced in a melamine plant (40) wherein off-gases resulting as by-products of the melamine synthesis are discharged from said plant at a medium pressure and recycled to the high-pressure urea synthesis section (11).

L'invention concerne un procédé intégré destiné à produire de l'urée et de la mélamine, dans lequel on produit de l'urée dans une usine à urée (10) comportant une section de synthèse d'urée à haute pression (11), à partir de laquelle on obtient une solution aqueuse contenant de l'urée, du carbonate d'ammonium et de l'ammoniaque, et une section de récupération d'urée (21) fonctionnant à basse pression, et on produit de la mélamine dans une usine à mélamine (40), dans laquelle les gaz de dégagement résultant en tant que sous-produits de la synthèse de la mélamine sont refoulés de ladite usine à une pression moyenne, et recyclés dans la section de synthèse d'urée à haute pression (11).

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