UAN

UAN

UAN is a solution of urea and ammonium nitrate in water used as a fertilizer. The combination of urea and ammonium nitrate has an extremely low critical relative humidity (18% at 30°C) and can therefore only be used in liquid fertilizers. The most commonly used grade of these fertilizer solutions is UAN 32.0.0 (32%N), which consists of 45% ammonium nitrate, 35% urea and only 20% water. Other grades are UAN 28, UAN 30 and UAN 18.The solutions are quite corrosive towards mild steel (up to 500 MPY on C1010 steel) and are therefore generally equipped with a corrosion inhibitor to protect tanks, pipelines, nozzles, etc.

Physical and Chemical Characteristics of Urea Ammonium Nitrate Solutions

The solutions contain a remarkably low amount of water and nevertheless have a low salt-out temperature:

References

* UNIDO and International Fertilizer Development Center (1998), "FertilizerManual" , Kluwer Academic Publishers, ISBN 0-7923-5032-4.

* Simplottm UAN-32 Product Data Sheethttp://www.simplot.com/agricultural/plant/upload/Urea-Ammon-Nitrate-Solution-32-0-0.pdf

* Poole Chemical UAN 32% Solutionhttp://www.poolechemical.com/uan32solution.html

* [http://www.uhde.biz/competence/technologies/fertilisers/techprofile.de.epl?profile=7&pagetype=1&pagenum=6 Process Design]

* For a good description of the chemical composition of UAN, see the University of Nebraska Fact Sheet 288-01, "Nitrogen Sources" by Tom Dorn, Extension Educator.http://lancaster.unl.edu/ag/factsheets/288.pdf


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