Process for the preparation of urea granules

Details Process for the preparation of urea granules Process for the preparation of urea granules

C - Chemistry, Metallurgy

07

C

C07C 273/14 (2006.01) B01J 2/16 (2006.01)

Patent

CA 2531381

Process for the preparation of urea granules in a fluid bed granulator comprising at least one inlet for fluidization air, a distribution plate above which the fluid bed is present and sprayers that are mounted in the distribution plate, from which the urea melt is sprayed on or over the urea particles present in the fluid bed, which particles are kept in motion by the fluidization air, characterized in that the fluidization air contains very finely atomized water and in that the urea concentration of the urea melt is higher than 97 wt.%.

Cette invention concerne un procédé de fabrication de granules d'urée dans un granulateur à lit fluidisé comprenant au moins une entrée pour l'air de fluidisation, un plateau de distribution disposé au dessus du lit fluidisé et des buses de pulvérisation montées dans le plateau de distribution à partir desquelles de l'urée fondue est pulvérisée sur ou par dessus les particules d'urée présentes dans le lit fluidisé. Ces particules d'urée sont maintenues en mouvement par l'air de fluidisation. Ce processus se caractérise en ce que l'air de fluidisation contient de l'eau très finement atomisée et que la concentration d'urée dans l'urée fondue est supérieure à 97 % en poids.

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