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Diesel oil tail gas reducing agent for improving low temperature performances, and preparation method thereof

A low-temperature performance, reducing agent technology, applied in air quality improvement, chemical instruments and methods, exhaust gas treatment, etc., can solve the problems of affecting the overall stability of the solution, easily exceeding the standard, increasing process costs, etc., to achieve high usage and the effect of promoting value

Inactive Publication Date: 2016-05-04
XUCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The urea solution with this concentration has the lowest crystallization point, and it will crystallize when it is lower than -11°C. In actual use, it will be completely frozen at -20°C, which restricts its use in cold winter weather in the north, especially in the northeast.
[0005] Adding a modifier to reduce the freezing point of the urea solution for vehicles is the most convenient and low-cost method, but due to the high requirements of the SCR catalyst on the purity and cleanliness of the urea solution for vehicles, metal salts that can significantly reduce the freezing point of the aqueous solution cannot be used, making the modification The choice of sex agents is very limited
There are many existing patents that use urea as the ammonia source and add modifiers to improve the freezing point, but most of them contain crystalline or powdered ammonium substances, such as ammonium formate, ammonium carbonate, ammonium bicarbonate, etc., which easily lead to uneven dissolution and affect Overall stability of the solution and increased process cost
When the content of ammonium carbonate and ammonium bicarbonate is high, CO 2 The detected amount is easy to exceed the standard, and the stability is poor, and it is easy to decompose

Method used

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  • Diesel oil tail gas reducing agent for improving low temperature performances, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Add 7.2718g of high-purity urea into a round-bottomed flask to which 15.6622g of high-purity water has been added, seal it with a ground plug, heat in a water bath to 40°C, and stir magnetically until the urea is completely dissolved and the solution is uniform and transparent;

[0043] (2) Cool the solution obtained in step (1) to room temperature, add 1.6735 g of N,N-dimethylformamide, seal it with a ground plug, and stir magnetically until the solution is completely mixed and uniform.

[0044] (3) The solution obtained in step (2) is pressure-filtered with a filter element with a filtration accuracy of 0.8pm to obtain the diesel vehicle exhaust catalytic reducer product with improved low-temperature performance of the present invention.

[0045] (4) After measurement, the solidification point of the mixture solution is -14.5°C, the surface tension is 61mN / m, the appearance is clear and transparent, and the content of impurity elements meets the standard requiremen...

Embodiment 2

[0047] (1) Add 7.2350g of high-purity urea into a round-bottomed flask to which 15.0031g of high-purity water has been added, seal it with a ground plug, heat in a water bath to 40°C, and stir magnetically until the urea is completely dissolved and the solution is transparent;

[0048] (2) Cool the solution obtained in step (1) to room temperature, add 2.6267 g of N,N-dimethylformamide, seal it with a ground plug, and stir magnetically until the solution is completely mixed and uniform.

[0049] (3) The solution obtained in step (2) is pressure-filtered with a filter element with a filtration accuracy of 0.8pm to obtain the diesel vehicle exhaust catalytic reducer product with improved low-temperature performance of the present invention.

[0050] (4) After measurement, the freezing point of the mixture solution is -16°C, the surface tension is 58.9mN / m, the appearance is clear and transparent, and the content of impurity elements meets the standard requirements; after being se...

Embodiment 3

[0052] (1) Add 7.2257g of high-purity urea into a round-bottomed flask to which 15.4654g of high-purity water has been added, seal it with a ground plug, heat in a water bath to 40°C, and stir magnetically until the urea is completely dissolved and the solution is transparent;

[0053] (2) Cool the solution obtained in step (1) to room temperature, add 3.8223 g of N,N-dimethylformamide, seal it with a ground plug, and stir magnetically until the solution is completely mixed and uniform.

[0054] (3) The solution obtained in step (2) is pressure-filtered with a filter element with a filtration accuracy of 0.8pm to obtain the diesel vehicle exhaust catalytic reducer product with improved low-temperature performance of the present invention.

[0055] (4) After measurement, the solidification point of the mixture solution is -18°C, the surface tension is 58mN / m, the appearance is clear and transparent, and the content of impurity elements meets the standard requirements; after bein...

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Abstract

The invention discloses a diesel oil tail gas reducing agent for improving low temperature performances, and a preparation method thereof. The problem of poor low temperature resitance of urea solutions for present traditional vehicles is solved in the invention, the atomization effect of the urea solution is effectively improved, and the NOx reducing efficiency is improved. The reducing agent comprises, by mass, 45-70% of highly pure water A, 20-35% of urea B, and 5-35% of micro-molecular liquid amide C. The product disclosed in the invention is suitable for being used at a low temperature, has a freezing point reaching -15 ~ -25 DEG C, has obviously lower surface tension than traditional common urea reducing agents, is suitable for being used in four seasons in south, and is suitable for being used in spring, summer, autumn and early winter in north.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a diesel exhaust reducing agent for improving low-temperature performance and a preparation method thereof. Background technique [0002] On May 15, 2014, the State Council issued the "2014-2015 Action Plan for Energy Conservation, Emission Reduction and Low-Carbon Development", pointing out that before the end of 2014, the national IV standard vehicle diesel will be supplied nationwide. During the "October" period of 2014, many provinces, including Jiangsu, Fujian, and Sichuan, issued their own national four oil promotion policies. The Ministry of Industry and Information Technology announced that starting from January 1, 2015, diesel vehicles nationwide will enforce the National IV emission standards. With the promotion and implementation of the National IV emission standard for vehicle diesel, the domestic vehicle urea market has ushered in a new opportunity. Altho...

Claims

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Application Information

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IPC IPC(8): B01J31/02F01N3/10
CPCB01J31/0245F01N3/10F01N2370/00F01N2570/14Y02A50/20
Inventor 武小满郭丽丽刘春辉徐岩岩李叶向天成陈新华
Owner XUCHANG UNIV
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