C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 273/04 (2006.01)
Patent
CA 2208027
In a process for urea production, substantially pure ammonia and carbon dioxide are reacted in a main reaction space (R-1) from which outgoes a reaction mixture subjected to stripping to obtain a partially purified mixture sent to a urea recovery section (3). From this section (3), a dilute carbamate solution is obtained which is recycled to an auxiliary reaction space (R-2) in which the residual carbamate is converted into urea. This process achieves high average conversion yield with reduced energy consumption.
Dans une technique de production d'urée, de l'ammoniac sensiblement pur et du dioxyde de carbone réagissent dans un espace de réaction principal (R-1) d'où ressort un mélange réactionnel, soumis à rectification pour donner un mélange partiellement purifié, qu'on envoie ensuite dans une zone de récupération d'urée (3). Dans cette zone, on obtient une solution diluée de carbamate qu'on recycle dans un espace de réaction auxiliaire (R-2), où le carbamate résiduel est transformé en urée. Cette technique permet d'obtenir un fort rendement moyen de conversion tout en réduisant la consommation d'énergie.
Oyen Wiggs Green & Mutala
Urea Casale S.a.
LandOfFree
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