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Ultralow-temperature urea reducing agent composition

A reducing agent and ultra-low temperature technology, applied in mechanical equipment, engine components, dispersed particle separation, etc., can solve problems such as melting, high failure rate, and increased cost, achieve high practical value, and solve the effect of high freezing point

Inactive Publication Date: 2011-10-12
LIAONING RUNDI AUTOMOTVE ENVIRONMENTAL PROTECTIONTECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the freezing point of the reducing agent of the traditional urea solution is around -11°C, which means that vehicles using SCR technology cannot go north through Shanhaiguan Pass in winter, which is obviously intolerable for today’s traffic so developed
[0006] The method to solve the problems of traditional urea reducing agent is generally to add antifreeze circulation heating or electric heating system and insulation system to the traditional reducing agent solution system, that is, adding additional parts such as heating pipe circuit, temperature sensor, insulation layer, etc., not only The cost of each vehicle increased by about 1,200 yuan, which undoubtedly increased the complexity of the system and the failure rate was high. In addition, when starting the vehicle in winter, the vehicle needs to be idling for a certain period of time. After the temperature of the engine coolant rises, the antifreeze is circulated to melt Frozen urea and other disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Choose high-purity urea component A to be 15 parts, analytically pure ammonium formate component B to be 22 parts, analytically pure ammonium formamide component C to be 10 parts, analytically pure ethanol component D to be 5 parts, high-purity water Component E is 50 parts; after stirring at room temperature until it is completely dissolved, it is pressure-filtered with a filter element with a filtration accuracy of 5 μm, which is the mixture solution of the present invention. After measurement, the freezing point of the mixture solution is -38°C, it is odorless, the appearance is clear and transparent, and the density is 1.048g / cm 3 , the content of biuret is 0.01%, the content of impurity elements meets the standard requirements, and the compatibility of plastics meets the requirements; after storage at room temperature for 48 hours, there is no perceptible change in appearance and smell, and the performance index tests are all qualified.

[0013] The ESC working con...

Embodiment 2

[0015] Choose 18 parts of high-purity urea component A, 20 parts of analytically pure ammonium formate component B, 7 parts of analytically pure ammonium formamide component C, 3 parts of analytically pure ethanol component D, and high-purity water component E is 52 parts; after stirring at room temperature until fully dissolved, filter under pressure with a filter element with a filtration accuracy of 5 μm, which is the mixture solution of the present invention. After measurement, the mixture solution has a freezing point of -36°C, is odorless, has a clear and transparent appearance, and has a density of 1.052g / cm 3 , the content of biuret is 0.02%, the content of impurity elements meets the standard requirements, and the compatibility of plastics meets the requirements; after storage at room temperature for 48 hours, there is no perceptible change in appearance and smell, and the performance index tests are all qualified.

[0016] The ESC working condition test was carried ...

Embodiment 3

[0018] Choose high-purity urea component A to be 17 parts, analytically pure ammonium formate component B to be 20 parts, analytically pure ammonium formamide component C to be 10 parts, analytically pure ethanol component D to be 3 parts, high-purity water Component E is 50 parts; after stirring at room temperature until it is completely dissolved, filter it under pressure with a filter element with a filtration accuracy of 5 μm, which is the mixture solution of the present invention. After measurement, the freezing point of the mixture solution is -36°C, odorless, clear and transparent in appearance, and the density is 1.050g / cm 3 , the content of biuret is 0.02%, the content of impurity elements meets the standard requirements, and the compatibility of plastics meets the requirements; after storage at room temperature for 48 hours, there is no perceptible change in appearance and smell, and the performance index tests are all qualified.

[0019] The ESC working condition te...

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PUM

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Abstract

The invention relates to an ultralow-temperature urea reducing agent composition. The solution comprises five components such as A, B, C, D and E and is characterized in that the component A is urea; the component B is ammonium; the component C is amide; the component D is low-molecular-weight alcohol; the component E is high-purity water; and the components A, B, C, D and E are mixed in proportion. Compared with the traditional urea reducing agents, the product has the following advantages: the freezing point of the product is lower than minus 35 DEG C; and the product is suitable for being used in the northern cold regions in winter.

Description

Technical field: [0001] The invention relates to an ultra-low temperature urea reducing agent composition, and the technology is applied to the post-treatment industry of automobile exhaust. Background technique: [0002] In the next few years, global automobile manufacturers, especially the United States and Europe, will enforce some stricter standards on vehicle nitrogen oxides NOX and particulate PM emissions, such as Euro 5 and Euro 6 emission standards. Under the pressure of emission regulations, on the one hand, foreign vehicle heavy-duty diesel engines are constantly upgrading and improving their technology; on the other hand, they need to choose appropriate after-treatment technology strategies and equipment, such as SCR (Selective Catalytic Reduction) catalytic conversion reduction technology , DPF (Diesel Particulate Filter) particle trap, DOC (Diesel Oxidation Catalyst) oxidation catalyst, etc. [0003] The essence of SCR technology is to use urea to decompose NH...

Claims

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Application Information

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IPC IPC(8): F01N3/20F01N3/28B01D53/94
Inventor 邹建波
Owner LIAONING RUNDI AUTOMOTVE ENVIRONMENTAL PROTECTIONTECH
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