What is the production formula for automotive urea?
2 Answers
Automotive urea production formula consists of 32.5% high-purity urea and 67.5% ultra-pure water. Automotive urea needs to be refilled approximately every 2,000 kilometers; for every 100 liters of diesel used, 3 to 5 liters of urea are consumed, which is equivalent to 3% to 5% of the fuel consumption. The reason for adding automotive urea is: The harmful substances in diesel vehicle exhaust are mainly nitrogen oxides and particulate matter. While particulate emissions can be reduced through technical means inside the engine, the exhaust primarily contains nitrogen oxides. By injecting urea into the exhaust after-treatment device, the urea decomposes into ammonia at high temperatures, which reacts with nitrogen oxides in the presence of a catalyst to produce harmless nitrogen and water.
The production formula for automotive urea is essentially a solution composed of 32.5% urea and 67.5% deionized water. The urea must be of high purity, free from impurities, as any contaminants can lead to crystallization or leave deposits in the SCR system, compromising emission control. This ratio is ingeniously designed to ensure it resists freezing at low temperatures and maintains moderate volatility at high temperatures. The water must be ultra-pure, deionized to prevent any minerals or pollutants from damaging vehicle components. Avoid attempting DIY mixing, as achieving the required precision is challenging—relying on commercially available branded products is more convenient and reliable. The key is to purchase from reputable sources, such as well-known auto parts stores, to avoid substandard products that could cause SCR system failures and increase repair costs. Automotive urea is crucial for reducing emissions in diesel vehicles, and regular replenishment helps protect the engine and extend its lifespan.
