Is vehicle urea the same as DEF?
Diesel Exhaust Fluid (DEF) is a urea liquid for discharge control. It is injected into the exhaust current and reacts with the harmful greenhouse gas. DEF is a harmless solution, consisting of 32.5% urea and 67.5% derived water.

Is vehicle urea the same as Adblue?
Adblue is a car urea water solution, which is made of 32.5% urea water solution by mixing urea and softening water. After mixing, cool the urea solution Adblue 32.5 % and transfer it to the storage tank.

Why does diesel engine need urea?
Urea is added to many diesel vehicles to convert dangerous nitrogen oxides into harmless nitrogen and water. NOX is a major air pollutant, which can cause smoke, which causes asthma, respiratory diseases and heart disease

Production method
The preparation method is to mix purified ammonia and carbon dioxide at a molar ratio of 2.8 ~ 4.5 into the synthesis tower. The pressure in the tower is 13.8 ~ 24.6MPa, the temperature is 180 ~ 200 ºC, and the residence time of reaction materials is 25 ~ 40min. The urea solution containing excess ammonia and ammonium carbamate is obtained. After decompression and cooling, the urea solution separated from ammonia and ammonium carbamate is evaporated to more than 99.5%, and then granulated in the granulating tower to obtain finished urea.

Characteristics of vehicle urea

When the temperature of urea is below 20 ºC and the relative humidity is below 70%, diesel vehicle urea will not only not absorb moisture, but also evaporate water and reduce its water content; When the temperature exceeds 20 ºC and the relative humidity is higher than 80%, it starts to absorb moisture, and becomes paste when it is serious. When the air is dried again, it will re agglomerate, which is only inferior to ammonium nitrate. When the urea aqueous solution is at 80 ºC, hydrolysis and decomposition reactions will occur, forming ammonium carbamate, ammonia gas and carbon dioxide respectively.

Under acid and alkaline conditions, urea will decompose faster when it is heated. Urea is easy to combine with straight chain carbohydrates to form crystalline additional compounds; It forms a variety of double salts with various inorganic compounds, such as Ca (NO3) 2 · 4CO (NH2) 2, NH4Cl · CO (NH2) 2, CaChemicalbookSO4 · 4CO (NH2) 2, MgSO4 · 4CO (NH2) 2 · 3H2O, Mg (NO3) · 4CO (NH2) 2 · 2H2O, etc; It is easy to form urea phosphate, dicalcium phosphate and water with monocalcium phosphate, namely Ca (H2PO4) 2 · H2O+CO (NH2) 2 → H3PO4 · CO (NH2) 2+CaHPO4+H2O;

With nitric acid, it is easy to form urea nitrate, CO (NH2) 2+HNO3 → CO (NH2) 2 · HNO3, which combines and relaxes the two; It can combine with formaldehyde to form urea formaldehyde compounds (uric acid rubber shrinks), in which the higher proportion of formaldehyde is urea resin, and the lower proportion is slow-release (effective) urea.

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