Process for the preparation of urea

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 273/04 (2006.01)

Patent

CA 2462288

The invention relates to a process for the preparation of urea from ammonia and carbon dioxide, which preparation takes places wholy or partly with the application of a synthesis reactor, a condenser, a scrubber and a stripper, wherein an outlet of the stripper, through which a gas stream is discharged during operation, is functionally connected to the inlet of the condenser and to the inlet of the reactor and wherein an outlet of the condenser is functionally connected to an inlet of the scrubber and wherein the obtained reaction mixture is stripped in the stripper in countercurrent with one of the starting materials, wherein the gas stream coming from the top of the submerged condenser is subjected to an extra washing step before this gas stream is supplied to the high-pressure scrubber. The submerged condenser operating as such may he for example a submerged condenser of horizontal or vertical design of a falling-film high-pressure carbamate condenser transformed into a submerged condenser. The invention further relates to a process for improving and/or optimizing a urea plant as well as to a urea plant as such.

L'invention porte sur un procédé de préparation d'urée à partir d'ammoniac et de CO¿2? nécessitant l'utilisation entière ou partielle: d'un réacteur de synthèse, d'un condenseur, d'un épurateur et d'un stripper. La sortie du stripper par laquelle le gaz se décharge pendant l'opération est fonctionnellement reliée à l'entrée du condenseur et à celle du réacteur. La sortie du condenseur est fonctionnellement reliée à l'entrée de l'épurateur et le mélange réactif est strippé dans le stripper, à contre-courant de l'un des produits de départ. Le gaz provenant du sommet du condenseur submergé subit une étape supplémentaire de lavage avant d'être transféré dans l'épurateur à haute pression. Le condenseur submergé peut par exemple être le condenseur submergé de type horizontal ou vertical d'un condenseur de carbamate à flot tombant transformé en condenseur submergé. L'invention porte également sur un procédé d'amélioration et d'optimisation d'une installation de production d'urée et sur une telle installation.

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