Chemistry: fertilizers – Processes and products – Organic material-containing
Patent
1979-02-28
1980-08-12
Silverberg, Sam
Chemistry: fertilizers
Processes and products
Organic material-containing
427213, 118DIG5, C05C 900
Patent
active
042171270
ABSTRACT:
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.
REFERENCES:
patent: 2979421 (1961-04-01), Rissman et al.
patent: 3001228 (1961-09-01), Nack
patent: 3206297 (1965-09-01), O'Connor
patent: 3231413 (1966-01-01), Berquin
patent: 3253944 (1966-05-01), Wurster
patent: 3615187 (1971-10-01), Suzukawa et al.
patent: 3856441 (1974-12-01), Suzukawa et al.
patent: 3940514 (1976-02-01), Baker et al.
patent: 4071304 (1978-01-01), Chauvin et al.
patent: 4123570 (1978-10-01), Van Hijfte et al.
patent: 4142885 (1979-03-01), Heumann et al.
Hisadomi Masaki
Kawamura Sigeru
Kono Hisashi
Minemura Norimichi
Nakai Shigeyuki
Silverberg Sam
Ube Industries Ltd.
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