Process for the preparation of urea

Details Process for the preparation of urea Process for the preparation of urea

C - Chemistry, Metallurgy

07

C

C07C 273/04 (2006.01)

Patent

CA 2445589

Process for the preparation of urea from ammonia and carbon dioxide in which a urea synthesis solution containing urea, ammonium carbamate and unconverted ammonia is formed in a synthesis zone, a part of the urea synthesis solution being transferred from the synthesis zone to a medium-pressure treatment zone operating at a pressure of 1-4 Mpa, and a gas stream from the medium-pressure treatment zone being absorbed into the low-pressure ammonium carbamate solution from the urea recovery section.

Procédé de préparation d'urée à partir d'ammonium et de dioxyde de carbone, selon lequel on forme dans une zone de synthèse une solution de synthèse d'urée, du carbamate d'ammonium et de l'ammonium non transformé. Une partie de la solution de synthèse d'urée est transférée depuis la zone de synthèse vers une zone de traitement à pression moyenne fonctionnant à une pression de 1-4 Mpa; et un flux gazeux provenant de la zone de traitement à pression moyenne est absorbé dans la solution de carbamate d'ammonium à faible pression provenant de la partie de récupération d'urée.

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