Enhanced process for the synthesis of urea

C - Chemistry – Metallurgy – 07 – C

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C07C 273/04 (2006.01) B01J 19/24 (2006.01)

Patent

CA 2687668

An enhanced process is described for the synthesis of urea from ammonia and carbon dioxide, at a high pressure and temperature, with the formation of ammonium carbamate as intermediate, which includes a high pressure synthesis section, comprising at least one separation step by decomposition-stripping with ammonia of the non-converted ammonium carbamate, carried out in a vertical apparatus, commonly called stripper, characterized in that said step also comprises a feeding, in the lower part of said stripper, of a stream of CO2, heated to a temperature ranging from 130 to 230°C, in a quantity of 1 to 15% by weight with respect to the total weight of the fresh CO2 fed to the process, containing a passivating agent in such a quantity that its equivalent content of O2 in moles varies from 0.05% to 0.80% with respect to the moles of CO2 of said stream.

L'invention concerne un procédé amélioré pour la synthèse de l'urée à partir d'ammoniac et de dioxyde de carbone, sous une pression et une température élevées, avec la formation de carbamate d'ammonium en tant qu'intermédiaire, lequel procédé comprenant une section de synthèse sous haute pression, avec au moins une étape de séparation par décomposition-stripping avec de l'ammoniac du carbamate d'ammonium non converti, effectuée dans un appareil vertical communément appelé stripper, caractérisé en ce que ladite étape comprend également une introduction, dans la partie inférieure dudit stripper, d'un courant de CO2 chauffé à une température allant de 130 à 230 °C, en quantité de 1 à 15 % en poids par rapport au poids total du CO2 d'appoint introduit dans le procédé, contenant un agent de passivation en quantité telle que sa teneur équivalente en O2 en moles varie de 0,05 % à 0,80 % par rapport au nombre de moles de CO2 dudit courant.

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