What raw materials are used to make automotive urea solution?
1 Answers
Automotive urea solution is generally synthesized from NOX with 32.5% ultra-pure urea and pure water. The following is relevant information about automotive urea: 1. Introduction: Automotive urea is a urea aqueous solution with a concentration of 32.5% and a solvent of ultra-pure water. The production raw materials are specialized automotive urea materials and ultra-pure water, with the key point being the purity of the raw materials. From a production process perspective, although the purity requirements for automotive urea raw materials are higher than those for general industrial use, current domestic processes can already meet practical application needs. The production process of automotive urea is not sufficient to create high entry barriers. 2. Principle: At temperatures between 70-75°C, urea undergoes hydrolysis in an aqueous solution. At temperatures below 30°C, urea recrystallizes from the aqueous solution. Each hydrolysis and crystallization cycle significantly improves its purity. Generally, using industrial-grade urea for one hydrolysis and crystallization cycle can meet the standard requirements for automotive urea, with a production ratio of 1.5:1.