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:


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

* Simplottm UAN-32 Product Data Sheet

* Poole Chemical UAN 32% Solution

* [ 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.

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • uan — ba·ca·uan; la·uan; quech·uan; …   English syllables

  • UAN — Dieser Artikel oder Absatz stellt die Situation in Deutschland dar. Hilf mit, die Situation in anderen Ländern zu schildern. Auftragnehmer ist ein Begriff, der in der deutschen Rechtssprache nicht ganz präzise bei verschiedenen Vertragstypen,… …   Deutsch Wikipedia

  • UAN — Urea Ammonium Nitrate (Miscellaneous » Farming) **** United Animal Nations (Community » Non Profit Organizations) **** Universal Application Network (Business » Firms) * Unión Autonomista Navarra (International » Spanish) …   Abbreviations dictionary

  • UAN — uric acid nitrogen …   Medical dictionary

  • UAN — Universal Access Number (CS 1 Service) …   Acronyms

  • uan — abdiquant accentuant accouant afflouant affluant allouant amadouant apiquant appliquant arquant astiquant attaquant attribuant atténuant avouant bafouant baraquant bifurquant biloquant bisquant bivouaquant blinquant bloquant braquant briquant… …   Dictionnaire des rimes

  • uan — ISO 639 3 Code of Language ISO 639 2/B Code : ISO 639 2/T Code : ISO 639 1 Code : Scope : Individual Language Type : Living Language Name : Kuan …   Names of Languages ISO 639-3

  • UAN — abr. Uniуn Autonomista Navarra …   Diccionario de Abreviaturas de la Lengua Española

  • UAN — Universal Access Number (CS 1 Service) …   Acronyms von A bis Z

  • uân — [ref dict= Unihan (Ch En) ]紜[/ref], [ref dict= Unihan (Ch En) ]蘊[/ref], [ref dict= Unihan (Ch En) ]醞[/ref] …   Vietnamese Index for Unihan

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.