Process for preparing granular urea

Details Process for preparing granular urea Process for preparing granular urea

C - Chemistry, Metallurgy

05

C

C05C 9/00 (2006.01) B01J 2/04 (2006.01) B01J 2/16 (2006.01) C07C 273/02 (2006.01) C07C 273/14 (2006.01)

Patent

CA 2215596

The present invention provides a process for preparing granular urea, which solves a problem for removing a moisture in a prilling tower method and a problem for concentrating diluted formaldehyde in granulation by a fluidized, spouted bed method when urea is granulated in the presence of formaldehyde. That is, the present invention provides a process for preparing granular urea from liquid drops or sprayed drops of a urea solution, wherein the urea solution is divided into two portions of a urea solution A and a urea solution B, and a urea solution prepared by mixing an aqueous formaldehyde solution with the urea solution A, concentrating the above mixed solution and then mixing it with the urea solution B is used.

La présente invention concerne un procédé de préparation d'urée granulaire qui résout le problème de l'élimination de l'humidité dans le procédé de grelonage et le problème de la concentration de formaldéhyde dilué dans le procédé de granulation par un lit fluidisé à jets quand l'urée est granulée en présence de formaldéhyde. Cela signifie que la présente invention fournit un procédé de préparation d'urée granulaire à partir de gouttes de liquide ou de gouttes pulvérisées d'une solution d'urée. Cette solution est divisée en deux parties: solution d'urée A et solution d'urée B. On prépare une solution en mélangeant une solution aqueuse de formaldéhyde avec la solution A, on concentre ce mélange puis on le mélange à la solution B.

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