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Preparation method of automobile urea solution

A technology for vehicle urea and solution, applied in separation methods, chemical instruments and methods, dispersion particle separation, etc., can solve the problems of low yield of raw urea, and achieve the effects of reducing aldehyde content, simplifying purification procedures, and simple equipment

Inactive Publication Date: 2015-01-07
HENAN JUNHUA DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the impurity removal rate of this method is high, the raw material urea yield is on the low side

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Adopt pure water with a resistivity of 18.25MΩ·cm, agricultural qualified product urea to be mixed with urea solution of 32.5% (mass fraction), its biuret content is 0.43%, aldehyde content is 14.64mg / kg, filters, then adds 1.16% aldehyde treatment agent (based on solution mass), act for 20 minutes, and finally pass through the anion and cation secondary ion exchange resin column for purification treatment, the solution outflow rate is about 2ml / min, and the biuret content in the collected solution is 0.03% , the content of aldehydes is 4.71mg / kg, the total content of impurities is below 19ppm, and meets the technical requirements of urea solution for vehicles.

Embodiment 2

[0026] Adopt pure water with a resistivity of 18.25MΩ·cm and agricultural qualified product urea to prepare a 35% (mass fraction) urea solution, the biuret content is 0.47%, and the aldehyde content is 15.11mg / kg, filtered, and then added 2.13% aldehyde treatment agent (based on solution mass), act for 20 minutes, and finally pass through the anion and cation secondary ion exchange resin column for purification treatment, the solution outflow rate is about 2ml / min, and the biuret content in the collected liquid obtained is 0.02% , the content of aldehydes is 1.54mg / kg, the total content of impurities is below 17ppm, and meets the technical requirements of urea solution for vehicles.

Embodiment 3

[0028] Pure water with a resistivity of 18.25MΩ·cm and agricultural qualified product urea are used to prepare a 35% (mass fraction) urea solution with a biuret content of 0.41% and an aldehyde content of 14.51mg / kg. After filtering, add 3.82% aldehyde treatment agent (based on solution mass), act for 10 minutes, and finally pass through anion and cation secondary ion exchange resin columns for purification treatment, the solution outflow rate is about 2ml / min, and in the collected solution obtained, the biuret content is 0.02% , the content of aldehydes is 0.84mg / kg, the total content of impurities is below 16ppm, and meets the technical requirements of urea solution for vehicles.

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PUM

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Abstract

The invention relates to a preparation method of an automobile urea solution. The method comprises the following steps: (1) selecting agricultural grade urea and pure water serving as raw materials, and preparing the raw materials into a urea solution; (2) purifying the urea solution prepared in the step (1) through a filter; (3) adding an aldehyde treatment agent into the urea solution obtained in the step (2) to lower the aldehyde content of the urea solution; and (4) loading the urea solution obtained in the step (3) through an ion exchange resin column, and removing metal ions and other impurities from the urea solution to obtain the urea solution which meets automobile use requirements. The preparation method disclosed by the invention is simple and easy to implement, and has high technical adaptability and high raw material yield. The obtained urea solution has low impurity content and good development and application values.

Description

technical field [0001] The invention relates to a preparation method of a catalytic reducing agent, in particular to a preparation method of a vehicle urea solution. Background technique [0002] Urea for vehicles is a high-purity urea solution developed in recent years and suitable for SCR systems (selective catalytic reduction systems). Under the condition of high temperature (above 300°C), the urea solution first decomposes into ammonia gas, and then under the action of special catalyst, the ammonia gas undergoes a redox reaction with the nitrogen oxides in the exhaust gas of diesel vehicles to produce nitrogen and water, thereby making nitrogen The emission of oxides has reached the national IV or even higher emission standards. [0003] The raw materials for the production of urea for vehicles are ordinary urea and ultrapure water. However, during the production and packaging of agricultural urea, impurities such as metal ions, aldehydes, insolubles, and biurets will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01D53/56
Inventor 刘灏郑强位南南李新丽
Owner HENAN JUNHUA DEV
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