Process and apparatus for producing urea granules

C - Chemistry – Metallurgy – 05 – C

Patent

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23/391, 117/46.8

C05C 9/00 (2006.01) B01J 2/16 (2006.01)

Patent

CA 1118293

- 51 - ABSTRACT OF THE DISCLOSURE Urea granules having a desired size are produced in a fluidized bed formed in a vertical cylindrical vessel which is partitioned into an upper compartment and a lower compartment by means of a funnel shaped partition having numerous holes through which the lower compartment is connected to the upper compartment, by: (A) feeding urea solid seed particles into the upper compartment; (B) atomizing and injecting upward a liquid containing a material to be incorporated onto the urea seed particles into the upper compartment through a nozzle having a top thereof located just above a center of the bottom of the funnel-shaped partition, (C)-(1) upwardly blowing a number of streams of an inert gas having a temperature of from 50 to 98°C into the upper compartment through the holes of the funnel-shaped partition; (C)-(2) blowing upward a stream of an inert gas having a temperature of from 30 to 120°C into the upper compartment through an annular opening formed in the bottom of the funnel-shaped partition and surrounding the atomizing nozzle, whereby the atomized liquid droplets can adhere to the urea seed particles and be dried or solidified while the particles are circulated in a fluidized bed in the upper compartment; (D) discharging the resultant urea granules from the upper compartment through the annular opening and; (E) discharging exhaust gas from the top end of the upper compartment.

322444

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