Improvement to the high-pressure loop in a process for...

C - Chemistry – Metallurgy – 07 – C

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C07C 273/04 (2006.01)

Patent

CA 2743659

A process and a related plant layout for producing urea are disclosed, wherein the high--pressure loop (1) comprises a synthesis reactor (2), a thermal stripper (3), a condenser (4), and an adiabatic CO2 stripper (10) disposed upstream said thermal stripper, separating a vapour phase (13) containing ammonia from the urea solution (9) discharged from the reactor, and recycling said vapour phase to the re-actor. The adiabatic stripper (10) can be incorporated in a reactor (200) having a top reaction zone and a bottom adiabatic stripping zone. A revamping method for a conventional urea plant in accordance with the inventive process is also disclosed.

L'invention concerne un procédé et un agencement d'usine associé pour la production d'urée, selon lesquels la boucle haute pression (1) comprend un réacteur de synthèse (2), un extracteur thermique (3), un condenseur (4) et un extracteur de CO2 adiabatique (10) disposé en amont dudit extracteur thermique, qui sépare une phase vapeur (13) contenant de l'ammoniac de la solution d'urée (9) déchargée du réacteur, et recycle ladite phase vapeur dans le réacteur. L'extracteur adiabatique (10) peut être incorporé dans un réacteur (200) qui comporte une zone de réaction supérieure et une zone d'extraction adiabatique inférieure. L'invention concerne également un procédé de modernisation d'une installation classique de production d'urée selon le procédé de l'invention.

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