Urea (carbamide) — chemical compound, diamide of carbonic acid. White crystals, soluble in polar solvents (water, ethanol, luquid ammonia).
In the industry urea is synthesized on Bazarov's reaction from ammonia and carbon dioxide:
2NH3 + CO2 NH2CONH2 + H2O
For this reason of production of urea combine with ammoniac productions.
Urea is the large-capacity product used generally as nitrogen fertilizer (content of nitrogen of 46%) and is issued, in this quality, in the steady against caking granulated look.
Other important industrial use of urea is synthesis mochevino-aldehydic (first of all ureaformaldehyde) the pitches which are widely used as adhesives in production of the fiber boards (FB) and furniture production. Derivative urea — effective herbicides.
Urea is also applied to purification of combustion gases of thermal power plants, boiler rooms, incineration plants, internal combustion engines, etc. of nitrogen oxides:
(NH2)2CO + H2O →t ° 2NH3 + CO2
3NO + 2NH3 → N2 + 3H2O
The carbamide is registered as food additive of E927b. It is used, in particular, in production of chewing gum.