• Chinese name: Urea English name: Urea
• Alias: Carbonamide Chemical formula: CH4N2O
• Molecular weight: 60.06 CAS: 57-13-6
• EINECS: 200-315-5 Melting point: 132.7ºC
• Boiling point: 196.6°C / standard atmospheric pressure Water solubility: soluble in water
• Density: 1.335g/cm3 Appearance: White crystal
• Application: Fertilizer Safety Description: Avoid contact with skin and eyes.
Urea, also known as carbamide, is an organic compound composed of carbon, nitrogen, oxygen, and hydrogen. It is a white crystal. One of the simplest organic compounds, it is the main nitrogenous end product of the metabolic breakdown of proteins in mammals and some fish. It is also the nitrogen fertilizer with the highest nitrogen content.
As a neutral fertilizer, urea is suitable for a variety of soils and plants. It is easy to store, easy to use, and has little damage to the soil. In industry, carbon dioxide are used to synthesize urea under certain conditions.
physical properties
Chemical formula: CO(NH2)2, molecular weight 60.06, CO(NH2)2 is colorless or white needle-like or rod-like crystals, industrial or agricultural products are white slightly reddish solid particles, odorless and tasteless. The nitrogen content is about 46.67%. Density 1.335g/cm3. Melting point 132.7 ºC. Soluble in water and alcohol, insoluble in ethe Weakly alkaline.
CAS No.: 57-13-6
EINECS Number: 200-315-5
Molecular formula: CH4N2O
Molecular weight: 60.05
Melting point: 131-135ºC
Boiling point: 196.6°Cat760mmHg
Refractive index: n20/D 1.40
Flash point: 72.7°C
Inchi: InChI=1/CH4N2O/c2-1(3)4/h(H4,2,3,4)
Density: 1.335
Water solubility: 1080 g/L (20ºC) Chemical properties
Under the action of acid, alkali and enzyme (acid and alkali need to be heated), urea can be hydrolyzed to carbon dioxide.
Instable to heat, it will be deaminated into biuret when heated to 150~160ºC. If heated rapidly, it will be deaminated and trimerized into a six-membered ring compound cyanuric acid. (Mechanism: first deamination generates isocyanic acid (HN=C=O), and then trimerization.)
generate acetyl urea
it reacts with diethyl malonate to form malonyl urea (also known as barbituric acid because it has a certain acidity).
Under the action of basic catalysts such , it can react with formaldehyde to form urea-formaldehyde resin by polycondensation.Agricultural applications:
Urea is a high-concentration nitrogen fertilizer, a neutral quick-acting fertilizer, and can also be used to produce a variety of compound fertilizers. No harmful substances remain in the soil, and long-term application has no adverse effects. Animal husbandry can be used as feed for ruminants. However, if the temperature is too high in granulation, a small amount of biuret, also known as biuret, will be produced, which has an inhibitory effect on crops. my country stipulates that the content of urea biuret in fertilizers should be less than 0.5%. When the biuret content exceeds 1%, it cannot be used as seed fertilizer, seedling fertilizer and foliar fertilizer, and the urea content in other application periods should not be too much or too concentrated.
Urea is an organic nitrogen fertilizer, which can be absorbed and utilized by crops after being hydrolyzed into ammonium carbonate or ammonium bicarbonate by the action of urease in the soil. Therefore, urea should be applied 4 to 8 days before the fertilization period of crops.
main application
Medical Applications:
Dermatologists use certain agents containing urea to increase skin moisture. Occlusive dressings for non-surgically removed nails contain 40% urea.
A carbon-14-breath test to test for the presence of Helicobacter pylori uses urea containing either a carbon 14 or carbon 13 label. Because H. pylori's urease uses urea to make to raise the pH in its surrounding stomach. The same principle can be used to test similar bacteria living in the stomach of animals.
Urea is a high-concentration nitrogen fertilizer, a neutral quick-acting fertilizer, and can also be used to produce a variety of compound fertilizers. No harmful substances remain in the soil, and long-term application has no adverse effects. Animal husbandry can be used as feed for ruminants. However, if the temperature is too high in granulation, a small amount of biuret, also known as biuret, will be produced, which has an inhibitory effect on crops. my country stipulates that the content of urea biuret in fertilizers should be less than 0.5%. When the biuret content exceeds 1%, it cannot be used as seed fertilizer, seedling fertilizer and foliar fertilizer, and the urea content in other application periods should not be too much or too concentrated.
Urea is an organic nitrogen fertilizer, which can be absorbed and utilized by crops after being hydrolyzed into ammonium carbonate or ammonium bicarbonate by the action of urease in the soil. Therefore, urea should be applied 4 to 8 days before the fertilization period of crops.
Raw material for special plastics, especially urea formaldehyde resin
raw materials for certain glues
Composition of Fertilizers and Feeds
Instead of freezing salt sprinkled on the street, the advantage is that it does not corrode the metal
Enhance the smell of cigarettes
Gives industrially produced pretzels brown
ingredient in certain shampoos and cleansers
Composition of first aid refrigeration kits, as urea reacts with water to absorb heat
Treatment of exhaust gases from diesel engines, engines, thermal power plants, especially reducing their nitrogen oxides
The ingredients of the rain booster <compounded salt>
Used in the past to separate paraffins because urea can form clathrates
Refractory
Composition of Eco-Friendly Engine Fuels
Ingredients in Teeth Whitening Products
for chemical fertilizers
Important auxiliaries for dyeing and printing
Commercial application:
Raw material for special plastics, especially urea formaldehyde resin
raw materials for certain glues
Composition of Fertilizers and Feeds
Instead of freezing salt sprinkled on the street, the advantage is that it does not corrode the metal
Enhance the smell of cigarettes
Gives industrially produced pretzels brown
ingredient in certain shampoos and cleansers
Composition of first aid refrigeration kits, as urea reacts with water to absorb heat
Treatment of exhaust gases from diesel engines, engines, thermal power plants, especially reducing their nitrogen oxides
The ingredients of the rain booster <compounded salt>
Used in the past to separate paraffins because urea can form clathrates
Refractory
Composition of Eco-Friendly Engine Fuels
Ingredients in Teeth Whitening Products
for chemical fertilizers
Important auxiliaries for dyeing and printing
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