For diesel vehicles such as heavy trucks and passenger cars to meet the National IV emission standards, a suitable SCR system must be selected for exhaust gas treatment, and this system must use urea solution to treat nitrogen oxides in the exhaust gas. Therefore, urea solution for vehicles has become an essential product for heavy-duty trucks and passenger cars to meet the National IV emission standards.

SCR is the best choice for emission reduction in my country. At present, the current domestic diesel national standard GB19147-2009 requires the sulfur content to be ≤350ppm, while the ECR-DOC technology requires the sulfur content of the oil to be less than 10ppm, so it is temporarily unavailable in China. SCR is resistant to 350ppm sulfur-containing oil, so it has a technical basis for promotion. Because the national IV engine using SCR technology has better fuel economy than EGR technology, less changes to the engine, lower requirements for fuel and oil, advantages in the continuity of technology upgrades, good SCR catalyst durability and no catalyst blockage Therefore, SCR technology is the most suitable emission reduction technology route for heavy-duty diesel vehicles in my country.

Vehicle urea is a urea aqueous solution with a concentration of 32.5% and ultrapure water as the solvent. The raw materials for production are the special raw materials for vehicle urea and ultrapure water. The key point is the purity of the raw materials. From the point of view of production process, although the requirements for raw material purity of automotive urea are higher than that of general industrial use, the current domestic process can already meet the actual application requirements. The production process of automotive urea is not sufficient to create high barriers to entry.