Urea is produced from liquid ammonia and carbon dioxide gas through a rapid exothermic reaction that results in the formation of an intermediate liquid product called ammonium carbamate. This intermediate product is converted to urea and water through a slow and slightly endothermic reaction. Unreacted feed and intermediate product components are recovered by separation, recycling or recycling to maximize product yield. Vacuum evaporation is used to concentrate the urea product and remove water to create a high weight percentage “melt”. The melt can be used to produce urea granules or peril.
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