Liquid urea for vehicles and preparation method thereof

A technology of urea and products for vehicles, which is applied in the chemical industry, can solve the problems of polluted catalysts and high failure rates, and achieve the effects of simple preparation process, strong chelation ability, and improved miscibility

Inactive Publication Date: 2018-08-17
杨耀辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, low-quality diesel exhaust treatment fluid will pollute the catalyst in the SCR catalytic reaction tank, causing serious consequences
[0003] At present, the freezing point of traditional vehicle urea is around -11°C. In order to meet the needs of vehicles using SCR technology in low-temperature environments, traditional vehicle urea systems are generally eq

Method used

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  • Liquid urea for vehicles and preparation method thereof
  • Liquid urea for vehicles and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0022] Embodiment 1: This embodiment provides a vehicle urea solution, the components and mass percentages are as follows: urea solution 32.5%; methanol 5%; ammonium formate 4%; ammonium sulfate 5%; alkylphenol polyoxygen Vinyl ether 2%; propylene glycol 5%; polyoxyethylene stearate 2%; chelating agent 5.5%; deionized water 39%.

[0023] A method for preparing the above-mentioned vehicle urea liquid, which comprises the following steps:

[0024] (1) Weigh deionized water according to weight percentage, then pour it into a mixing tank, and heat it to 70~75℃, and then keep it at a constant temperature;

[0025] (2) Weigh the urea solution into deionized water by weight percentage, turn on the stirrer, and stir evenly;

[0026] (3) Weigh methanol, propylene glycol and polyoxyethylene stearate by weight percentage and add them to deionized water, turn on the agitator, and stir evenly;

[0027] (4) Weigh ammonium formate, ammonium sulfate and alkylphenol polyoxyethylene ether in weight perc...

Example Embodiment

[0032] Example 2, a vehicle urea solution and its preparation method provided in this implementation are basically the same as Example 1, except that the components and their mass percentages of vehicle urea solution are as follows: urea solution 32.5%; methanol 7%; ammonium formate 6%; ammonium sulfate 8%; alkylphenol polyoxyethylene ether 4%; propylene glycol 8%; polyoxyethylene stearate 5%; chelating agent 8%; deionized water 21.5%.

Example Embodiment

[0033] Example 3, a vehicle urea solution and its preparation method provided in this implementation are basically the same as Example 1, except that: urea solution 32.5%; methanol 6%; ammonium formate 5%; ammonium sulfate 7%; alkane Base phenol polyoxyethylene ether 3%; propylene glycol 6%; polyoxyethylene stearate 4%; chelating agent 6%; deionized water 30.5%.

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Abstract

The invention discloses a liquid urea for vehicles and a preparation method thereof. The liquid urea comprises following components in percentage by weight: 32.5% of urea solution, 5 to 7% of methanol, 4 to 6% of ammonium formate, 5 to 8% of ammonium sulfate, 2 to 4% of alkyl phenol polyoxyethylene, 5 to 8% of propylene glycol, 2 to 5% of polyoxyethylene stearate, 5.5 to 8% of chelating agent, and21.5 to 39% of deionized water. The formula of provided liquid urea is reasonable, ammonium formate and ammonium sulfate will promote the degradation of urea to generate ammonia gas, moreover, ammonium formate, ammonium sulfate, and ammonia gas can generate a synergistic effect to greatly improve the conversion rate of catalytic reduction of NOx; methanol, propylene glycol, and polyoxyethylene stearate can improve the compatibility; the anti-freezing performance of the liquid urea is good, the stability is high, the application range is largely enlarged; the chelating agent has a strong chelating performance for all raw materials, NOx in tail gas can be radically processed, the processing effect is good, and the urea is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a urea solution for vehicles and a preparation method thereof. Background technique [0002] With the continuous increase of the number of automobiles in our country, the harm of nitrogen oxides and particulate matter emitted by automobiles to human health and the atmospheric environment has attracted great attention. According to reports, all countries in the world are committed to reducing these two emissions. As far as my country is concerned, the "National IV" emission standard that has been implemented means that more advanced technologies must be used for vehicle exhaust emissions. A large number of experimental studies have shown that selective catalytic reduction technology (SCR) is the most suitable "National IV" emission solution for diesel vehicles, and this technology must use urea solution to reduce NO in exhaust gas. X Therefore, the urea solu...

Claims

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Application Information

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IPC IPC(8): B01D53/94B01D53/56
CPCB01D53/9418B01D2251/2067
Inventor 杨耀辉
Owner 杨耀辉
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