Name: China Factory High Quality Wholesale Price Urea CAS 57-13-6
Brand: Wuhan Fortuna Chemical Co., Ltd.

Specifications of Urea CAS 57-13-6

Items	Specifications	Results
Appearance	White crystalline granuler	Complies
Total nitrogen content	46.2%min	46.5%
Biuret	≤1.0%	0.9%
Moisture	≤0.5%	0.15%
Size（0.85~2.8mm）	≥90%	97%

Parameters of Urea CAS 57-13-6

Product parameters
Cas number:	57-13-6
Appearance:	White crystalline granuler
Purity:	46%min
Package details:	50kg/bag
Brand:	Fortunachem

Core Definition & Chemistry:

Chemical Formula: CO(NH₂)₂ (Carbamide).
Structure: A planar organic molecule with a central carbon atom double-bonded to oxygen and single-bonded to two nitrogen atoms, each bonded to two hydrogen atoms.
Properties: White, crystalline, odorless solid. Highly soluble in water (key for biological excretion). Melts at 133°C (decomposes). Non-toxic, hygroscopic (absorbs moisture).

Biological Role - Waste Product:

Primary Function: The main nitrogenous waste product in mammals (including humans), birds, and some reptiles/amphibians (ureotelic organisms).
Formation (Urea Cycle): Synthesized primarily in the liver from toxic ammonia (NH₃) generated during protein/amino acid breakdown. The cycle combines ammonia with carbon dioxide, using ornithine as a carrier, ultimately producing urea and regenerating ornithine.
Excretion: Transported in the bloodstream to the kidneys, filtered out, and dissolved in water as the primary solute in urine. Blood Urea Nitrogen (BUN) levels are a key indicator of kidney function.

Historical Significance:

Wöhler's Synthesis (1828): First intentional synthesis of an organic compound (urea) from inorganic starting materials (ammonium cyanate). This landmark experiment disproved "vitalism" (the idea that organic compounds required a "vital force" only found in living organisms) and founded modern organic chemistry.

Industrial Production (Bosch-Meiser Process):

Raw Materials: Ammonia (NH₃) and Carbon Dioxide (CO₂) - typically derived from natural gas.
Process:
Reaction: 2 NH₃ + CO₂ → Ammonium Carbamate (High pressure: 150-200 bar, High temp: 180-200°C)
Dehydration: Ammonium Carbamate → Urea + H₂O (Requires heat, lower pressure; equilibrium driven by water removal).
Output: Molten urea is concentrated, purified, and formed into prills or granules (>90% for fertilizer).

Major Applications:

Fertilizers (Dominant Use): Provides essential nitrogen (N) for plant growth (highest N content of solid fertilizers at 46%). Applied as granules, in blends (NPK), or liquid solutions (UAN). Prone to ammonia volatilization loss (mitigated by inhibitors/coatings).

Chemical Industry Feedstock:

Urea-Formaldehyde (UF) Resins: Used in adhesives for wood products (plywood, particleboard), coatings, laminates, textiles.
Melamine Production: Key precursor.
Other: Barbiturates, hydrazine, flame retardants, stabilizers.
Reducing Emissions (Selective Catalytic Reduction - SCR):

Diesel Exhaust Fluid (DEF)/AdBlue: Aqueous urea solution (32.5%). Injected into diesel exhaust, decomposes to ammonia, which catalytically converts harmful NOx gases into harmless nitrogen (N₂) and water (H₂O). Critical for meeting emission standards.
Other Uses:

Animal Feed: Non-protein nitrogen (NPN) source for ruminants (microbes convert it to protein).
Cosmetics/Skincare: Moisturizer (keratolytic agent).
Deicing Agent: Less corrosive than salt, but environmental concerns exist.
Explosives: Component of urea nitrate (regulated).

Key Considerations:

Environment: Fertilizer runoff contributes to eutrophication (algal blooms, dead zones). SCR reduces air pollution.
Safety: Generally safe; dust can irritate, molten urea causes severe burns. Urea nitrate is a security concern.

In Essence: Urea is biologically vital as the primary vehicle for safe nitrogen excretion in mammals. Industrially, it's the world's most important nitrogen fertilizer and a versatile chemical building block, notably for resins and emission control technology (SCR/DEF), underpinning modern agriculture and manufacturing.