Preparing method for urea solution used for vehicles

Abstract

The invention discloses a preparing method for a urea solution used for vehicles. The preparing method comprises the following steps that by weight, 20-35 parts of urea, 60-80 parts of high-purity water, 5-10 parts of ethanol, 4-7 parts of N-methylsuccinimide and 1-3 parts of polyoxyethylene stearate are weighed; urea and high-purity water are mixed and stirred, and a urea solution is obtained; a cellulose xanthate adsorbent is added into the urea solution, stirring and filtering are carried out, and a clarified urea solution is obtained; then ion exchange is carried out, and a purified urea solution is obtained; finally, the purified urea solution, ethanol, N-methylsuccinimide and polyoxyethylene stearate are stirred evenly, and the urea solution used for vehicles is obtained. The method has the advantages of being simple in preparing process, high in production efficiency, environmentally friendly, low in cost, remarkable in impurity removing effect and the like, and industrial production is easy to achieve.

Description

technical field [0001] The invention relates to the technical field of automobile tail gas treatment, in particular to a method for preparing a urea solution for automobiles. Background technique [0002] In recent years, air quality has continued to decline, and smog has become increasingly serious. Motor vehicle exhaust emissions account for about 20% to 25% of the causes of smog on average. At present, there are more than 57 million tons of pollutants emitted by motor vehicles every year in the country, including nitrogen oxides, hydrocarbons, carbon monoxide, and particulate matter. Among them, nitrogen oxides and particulate matter emitted by automobiles exceed 85%, and hydrocarbons and carbon monoxide exceed 70%. In addition, heavy-duty diesel vehicles, which account for less than 20 percent of the car population, emit about 60 percent of nitrogen oxides. Therefore, the control of motor vehicle emissions has become an increasingly urgent task. [0003] In the field o...

AI Technical Summary

Problems solved by technology

[0004] The raw materials for the production of urea for vehicles are ordinary urea and ultrapure water, and impurities such as metal ions, aldehydes, insolubles, and biurets will inevitably be introduced into ordinary urea during the production and packaging process, and these impurities will not only cause the catalyst of the SCR system inactivation, and clogging of pipes

Therefore, the commonly used method is to crystallize and purify common urea by chemical reagents. This process has the disadvantages of low yield, high cost, and easy environmental pollution.