A kind of urea solution for vehicle and preparation method thereof

Abstract

The invention relates to the field of chemical industry, in particular to a urea solution for vehicles and a preparation method thereof. The present invention adjusts the formula of the urea solution for vehicles, and solves the problem of some impurities in the existing urea solution for vehicles by adding active agents, which will affect the activity of urea, so that the reaction is too slow and urea is prone to condensation reaction and crystallization at high temperature, resulting in pipeline blockage And other issues. Among them, the ammonium alcohol ether carboxylate in the active agent reduces the problem of urea crystallizing and blocking pipelines at high temperatures, and the use of sodium percarbonate and ammonium persulfate improves the reaction rate of urea and improves the activity.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a urea solution for vehicles and a preparation method thereof. Background technique [0002] With the development of the economy, China's automobile industry has experienced rapid growth. While promoting social and economic development and bringing convenience to people's lives, automobiles have also brought energy and environmental protection issues. It has been shown that the nitrogen oxides and PM pollutants emitted by diesel vehicles in my country account for more than 60% and 90% of the total motor vehicle emissions, respectively. Urea solution for vehicles can reduce nitrogen oxides to N in the catalytic reduction technology (SCR) route 2 and water, reducing the source of air pollution. [0003] Diesel vehicles have relatively high requirements on urea for vehicles. During the production and packaging of urea, metal ions (Fe, K, Ca), and urea condensation at high temperat...

AI Technical Summary

Problems solved by technology

In the prior art, three stages of urea crystallization are used to purify this problem, but there are still some biurets and triurets produced during the purification process, so the production of biurets and triurets is reduced and the dissolution of urea is increased. Sex is an issue that needs to be addressed in the field

At the same time, in the traditional urea formula, the processed urea is often not pure enough. At the same time, no improver is added during the preparation of the urea solution, and the reaction of urea is too slow, which will easily lead to problems such as a decrease in the reaction rate.

[0004] To sum up, some impurities in the existing urea solution for vehicles cause the activity of urea to be affected, so the reaction is too slow, and urea is prone to condensation reaction and crystallization at high temperature, which leads to pipeline blockage and other problems.

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