China Industry Automotive Grade Low Biuret Formaldehyde Diesel Exhaust SCR Def Aus 32 Adblue Urea for Car

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.

Agricultural applications:


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


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