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 2361054

The invention relates to a process for the preparation of urea from ammonia and carbon dioxide, the preparation being effected in whole or in part in a vertical combi-reactor. The gas stream leaving the stripper is fed to the condenser section of a vertical combi-reactor in which this gas stream is wholly or partially condensed in the carbamate stream which is transferred from the scrubber section to the condenser section via a downcomer. Ammonia and carbon dioxide are partially converted into urea in this condenser section of the combi-reactor. The urea conversion is completed in the reaction section of the combi-reactor.

Ce procédé sert à élaborer de l'urée à partir d'ammoniac et de gaz carbonique, totalement ou partiellement dans un réacteur combiné vertical. Le courant gazeux de la colonne de stripping est envoyé dans l'étage condenseur du réacteur combiné vertical où la condensation partielle ou totale du courant gazeux donne naissance à un courant de carbamate qui est transféré via un trop-plein de l'étage laveur à l'étage condenseur. L'ammoniac et le gaz carbonique se convertissent partiellement en urée dans l'étage condenseur du réacteur combiné. La conversion de l'urée s'achève dans l'étage réacteur du réacteur combiné.

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