| Customization: | Available |
|---|---|
| CAS No.: | 57-13-6 |
| Formula: | CH4n2o |
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It can react with acids to form salts. There is hydrolysis. The condensation reaction can be carried out at high temperature to generate biuret, triuret and cyanuric acid. heated to
It is decomposed at 160°C, producing turning into cyanic acid at the same time. Because it is contained in human urine, it is named urea. Urea contains 46% nitrogen (N), which is the highest nitrogen content among solid nitrogen fertilizers.
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.
It reacts with generate semicarbazide.
Urea is easily soluble in water, 105 grams can be dissolved in 100 ml of water at 20°C, and the aqueous solution is neutral. There are two types of urea products. Crystalline urea is white needle-like or prism-like crystal form, and has strong hygroscopicity. Granular urea is a translucent particle with a particle size of 1 to 2 mm, with a smooth appearance and significantly improved hygroscopicity. The critical moisture absorption point at 20°C is 80% relative humidity, but at 30°C, the critical moisture absorption point drops to 72.5%, so urea should be kept open in humid climates in midsummer. At present, hydrophobic substances such as paraffin are added in urea production, and their hygroscopicity is greatly reduced
Commercial 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.
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