Method for producing urea pellets

Details Method for producing urea pellets Method for producing urea pellets

2006-08-01

2010-11-23

Mayes, Melvin C (Department: 1793)

Coating processes

Immersion or partial immersion

C502S167000, C564S063000

Reexamination Certificate

active

07838080

ABSTRACT:
A method for producing urea pellets having a narrow range of grain sizes and a sphericity >75% and a defined residual moisture ≦0.5% is provided. The method provides urea pellets having the properties required which meet the requirements of the automotive industry for use thereof in reducing emissions from diesel engines. The method includes spraying a urea-containing liquid having a temperature between ambient temperature and above the melting point of the urea into the high particle density region of the spray zone of a near circular gas, material flow of a spouted bed apparatus and onto the particle surface of the material, which is dried and granulated in the gas flow at a temperature of not more than 130° C. at a controlled heat and mass transfer rate while being separated.

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