Urea CAS#57-13-6

Products Description of Urea CAS#57-13-6

When the temperature is below 20℃ and the relative humidity is below 70%, urea not only does not absorb moisture, but also evaporates water to reduce its water content; when the temperature exceeds 20℃ and the relative humidity is higher than 80%, it begins to absorb moisture, and in severe cases, it becomes a paste. When the air turns dry again, it will re-agglomerate, and its degree is second only to ammonium nitrate. At 80℃, urea aqueous solution will undergo hydrolysis and decomposition reactions to form ammonium carbamate, ammonia and carbon dioxide respectively. Under acidic and alkaline conditions, urea decomposes faster when heated. Urea easily combines with straight-chain carbohydrates to form crystalline additional compounds; it forms various complex salts with various inorganic compounds, such as Ca(NO3)2·4CO(NH2)2, NH4Cl·CO(NH2)2, CaSO4·4CO(NH2)2, MgSO4·4CO(NH2)2·3H2O, Mg(NO3)·4CO(NH2)2·2H2O, etc.; it easily reacts with monocalcium phosphate to form urea phosphate, dicalcium phosphate and water, i.e., Ca(H2PO4)2·H2O+CO(NH2)2→H3PO4·CO(NH2)2+CaHPO4+H2O; it easily reacts with nitric acid to form urea nitrate in which the bond between the two is relaxed, CO(NH2)2+HNO3→CO(NH2)2·HNO3; it can combine with formaldehyde to form urea formaldehyde compounds (uric acid shrink gel), among which those with a high formaldehyde ratio are urea resins, and those with a low ratio are slow-release (effective) urea.

Urea Chemical Properties

Safety Information

Product Application of Urea CAS#57-13-6

Urea is mainly used as fertilizer. It is also used as raw material for manufacturing urea-formaldehyde resin, polyurethane, and melamine-formaldehyde resin in industry. It is also widely used in medicine, explosives, leather making, flotation agent, pigments, and dewaxing of petroleum products. When urea is heated to 200°C, solid cyanuric acid (i.e., cyanuric acid) is generated. The derivatives of cyanuric acid, such as trichloroisocyanuric acid, sodium dichloroisocyanate, tri(2-hydroxyethyl)isocyanurate, tri(allyl)isocyanurate, tri(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanate, triglycidyl isocyanurate, and cyanuric acid melamine complex, have many important applications. The first two are new high-grade disinfectants and bleaching agents. The total production capacity of trichloroisocyanuric acid in the world exceeds 80,000 tons.

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