Process for the preparation of a urea-comprising aqueous stream

Details Process for the preparation of a urea-comprising aqueous stream Process for the preparation of a urea-comprising aqueous stream

C - Chemistry, Metallurgy

07

C

C07C 273/16 (2006.01) B01D 53/94 (2006.01)

Patent

CA 2597761

The invention relates to a process for the preparation of a urea-comprising aqueous stream, that is suitable for use in a unit for the reduction of NOx in combustion engine exhaust gases, wherein the urea-comprising aqueous stream is separated directly from or after a recovery section in a urea production process and is thereafter diluted with water until the urea-comprising stream comprises 30-35 wt % urea.

La présente invention concerne un procédé de préparation d~un courant aqueux comprenant de l~urée, approprié pour être utilisé dans une unité de réduction des NOx de gaz d~échappement de moteurs à combustion. Selon ce procédé, le courant aqueux comprenant de l~urée est séparé directement dans ou après une section de récupération d~un procédé de production d~urée, suite à quoi il est dilué avec de l~eau jusqu~à une concentration de 30 à 35 % en poids d~urée dans le courant aqueux.

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