Monday, 24 April 2017

What is Prilled Urea and how it is different from Granular urea?




Urea has 46% nitrogen and thats why its a very good source of nitrogen for agriculture use. Urea is white crystalline solid organic compound and manufactured in "Prilled" form. Urea is considered an organic compound because it contains carbon. It is soluble in water. Its chemical formula is CO(NH2)2. "Prilled urea" is widely used in agriculture as nitrogen rich fertiliser. Urea is produced in excess of 140,000,000 tons per year worldwide, of which more than 90% of world production is destined for use as a fertiliser.

Prilled urea, or "prills" are formed by dropping liquid urea from a prilling tower into droplets that dry into roughly spherical shapes 1mm to 4 mm in diameter. A tall tower is used to make the prilled urea and the three prill towers of Duncans fertiliser are shown in following image.

Granular urea is chemically the same as prilled urea. Granular urea, however, is slightly larger and harder. Today, the use of prilled urea is more prevalent because it is more resistant to breaking down when being blended with the other components of fertiliser.


Specifications for Prilled Urea 46%N :

Nitrogen: 46% min.
Moisture: 0.3% max.
Biuret: 1% max.
Granulation: 1 - 4 mm 90-94 % min.
Melting Point: 132 Degrees Celsius
Colour: Pure White Prilled
Radiation: Non - Radioactive
Free Ammonia: 160pxt ppm max.
Prilled,Free Flowing, Treated against caking, 100% free from harmful substances


Specifications for Granular Urea 46%N :

Nitrogen: 46% min.
Moisture: 0.5% max.
Biuret: 1.4 % max.
Granulation: 2 - 4 mm 90-94 % min.
Melting Point: 132 Degrees Celsius
Colour: Standard White or Pure White
Radiation: Non - Radioactive
Free Ammonia: 160pxt ppm max.
Free Flowing, Treated against caking, 100% free from harmful substances


Prilled Urea and Granular Urea
(http://www.sabic.com/corporate/en/productsandservices/fertilizers/prilled-rea-granular-rea)
Description
Urea is the most popular and economical of all nitrogenous fertilizers being used worldwide. Urea has a nitrogen content of 46%, a higher concentration than this is available in other solid sources of nitrogen. Unlike phosphate and potassium fertilizers, which normally require a single application, urea needs to be applied several times during the growing season. Urea is an ideal source of nitrogen for all kinds of crops (wheat, barley, rice, maize etc.) In addition, urea is a major raw material for melamine, and an important raw material for the manufacture of other industrial products. SABIC
produces and markets both Prilled and Granular Urea, thus giving customers a flexible choice to suit their requirements.
Properties
Parameter
Unit
Quantity / Description
Spherical shape
granules
Melting point
°C
around 132
Molecular weight
amu
60
Specifications
Granular Urea Specifications
Parameter
Unit
Quantity
Total nitrogen
wt %
46 min
Biuret content
wt %
1% max
Formaldehyde (HCHO)
wt %
0.45 min
Crushing strength
kg
2 min
Moisture
wt %
0.5 max
Particle size
wt %
2-4 mm....90% min
> 4 mm....7% max
Prilled Urea Specifications
Parameter
Unit
Quantity
Total nitrogen
wt %
46 min
Biuret content
wt %
≤ 1
Moisture
wt %
≤ 0.5
Particle size
wt %
1-2.8 mm....90% min



Source : 

(http://duncansfertiliser.blogspot.com/2011/12/what-is-prilled-urea-and-how-it-is.html)
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