Chengde vehicle manufacturer vehicle urea urea water is heavy diesel vehicles to achieve the national IV emission standards essential products. Vehicle urea means urea concentration of 32.5% and a solvent for the ultra-pure aqueous urea, raw materials for urea crystals and ultrapure water. Trucks, buses and other diesel vehicles to achieve the national IV emission standards on exhaust gas treatment should be used and for the SCR system, and this system must use a urea solution to the exhaust of nitrogen oxide processing. Thus, the car became heavy trucks and passenger cars to achieve the national IV emission standards essential product urea solution. SCR is the best choice of emission reductions. At present, the existing standard GB19147-2009 requirements Chaiyou Guo sulfur ≤350ppm, and ECR-DOC technology require oil sulfur content below 10ppm, it has to promote the conditions in China temporarily. SCR may be resistant to 350ppm sulfur oil, thus promoting technical basis. SCR technology thanks to the country's four-engine fuel economy better than EGR technology, small changes to the engine, fuel and oil requirements are lower, have advantages in technology upgrades continuity, SCR catalyst durability and there is no catalytic converter clogged The risk, therefore SCR technology is the most suitable for China's heavy-duty diesel emission reduction technology route. Vehicle urea at a concentration of 32.5% ultra-pure water and the solvent is an aqueous solution of urea, the raw material for the production of urea crystals and ultrapure water, the key point is that the purity of raw materials. From the production process, although the automotive urea raw material purity requirements than the general industrial demand, but domestic technology already meet the actual application requirements. Vehicle urea production process is not sufficient to build high barriers to entry.