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Process for producing urea granules
| Details |
Inventors: Kono, Hisashi; Nakai, Shigeyuki; Hisadomi, Masaki; Minemura, Norimichi; Okita, Tetsuo; Kawamura, Sigeru;
Assignee: Ube Industries, Ltd. (Yamaguchi, JP)
Primary Examiner: Silverberg; Sam
Assistant Examiner:
Attorney, Agent or Firm: Burgess, Ryan and Wayne
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.degree. to 98.degree. 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.degree. to 120.degree. 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. |
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DETAILED DESCRIPTION OF THE INVENTION In the process of the present invention, the urea granules are produced in a fluidized bed which is formed in an upper portion of a vertical cylindrical region portitioned from a lower portion thereof by means of a funnel-shaped partition converging toward a bottom thereof and having a number of holes formed thereon.
That is, the upper portion is connected to the lower portion through the holes of the funnel-shaped partition.
The term "urea granules" used herein refers to a granule which consists of urea alone or a mixture of urea with an additive, or which is composed of a core consisting of urea alone or a mixture of urea and an additive and a coating layer consisting of a solid material different from the core-forming material.
The term "vertical cylindrical region" used herein may involve a vertical polygonal prismatic region, for example, a vertical hexagonal or octagonal prismatic region.
The term "funnel-shaped partition" used herein refers not only to an inverted circular cone-shaped partition but also to an inverted polygonal pyramid-shaped partition, for example, an inverted hexagonal or octagonal pyramid-shaped partition.
In the case of the polygonal pyramid-shaped partition, it is preferable that the edges of the pyramid be rounded.
In the process of the present invention, the fluidized bed is formed by the operations of: (A) feeding solid seed particles of urea into the upper portion of the cylindrical region; (B) atomizing and injecting upward a stream of a liquid containing a material to be incorporated onto the urea seed particles, into the upper portion of the cylindrical region through a nozzle having a top end thereof located just above a center of the bottom of the funnel-shaped partition, the liquid being forwarded to the nozzle through a path extending through the lower portion of the cylindrical region; (C)-(1) blowing a number of streams of an inert gas, not reactive to urea and the liquid, and having a temperature of from 50
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