Production process for preparing urea solution for vehicles from industrial urea

Abstract

The invention discloses a production process for preparing a urea solution for vehicles from industrial urea. The production process comprises the following steps: S1, removing impurities from industrial urea, crushing the urea raw material in a low-temperature environment after the impurities are removed, and then mixing the raw material, namely industrial urea powder with ultrapure water at a temperature of 20-40 DEG , so as to allow the industrial urea powder to be completely dissolved in the ultrapure water to obtain an industrial urea solution; and S2, continuously adding the industrial urea powder into the urea solution obtained in the step S1 until the solution is saturated, then mixing the saturated industrial urea solution and crystallizer circulating liquid, and allowing an obtained mixture to enter an external crystallization cooler pipe for cooling. According to the production process for preparing the urea solution for vehicles from the industrial urea, the cheap industrial urea is used as the raw material, process flow is short, equipment is simple, operation is convenient, and the production process is suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of vehicle urea production technology, in particular to a production process for preparing vehicle urea solution from industrial urea. Background technique [0002] Although the domestic automotive urea solution market has just started, the market demand potential is quite huge, and the sales volume of the domestic automotive urea solution market is growing rapidly. [0003] At present, the domestic production of urea for vehicles is dominated by small and medium-sized private enterprises, and the main production processes are divided into the following three routes: (1) Firstly, urea particles for vehicles are produced by re-purification of industrial urea, and then mixed with ultrapure water in proportion to prepare Urea solution for vehicles; (2) Industrial or agricultural urea is first mixed with ultrapure water, and then the urea solution for vehicles is prepared through the processes of primary filtrat...

AI Technical Summary

Problems solved by technology

The filtration and purification process of the above-mentioned (2) route is complicated, the equipment investment cost is high, and the reverse osmosis membrane flux and anti-pollution performance of the filtration process limit its production capacity

The (3) route is only suitable for large-scale chemical enterprises producing urea, and the impurities such as ammonia, formaldehyde, and diuresis in the product are relatively high, and the product quality is difficult to meet the requirements.