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Low-temperature condition release ammonia reducing agent composition and preparation method thereof

A technology of low temperature conditions and reducing agent, applied in separation methods, chemical instruments and methods, mechanical equipment, etc., can solve the problem of high temperature of ammonia

Active Publication Date: 2015-01-07
CHANGCHUN YONGCHANG PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a low-temperature ammonia-releasing reducing agent composition and its preparation method to solve the problem of the high temperature of the existing domestic urea reducing agent releasing ammonia, so that the patent can release the ammonia source at a relatively low temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh 98g of urea (analytically pure), dissolve it in 3100g of high-purity water with a conductivity of 2mS / cm, stir and dissolve it, add 1624g of ammonium carbonate (analytical pure), stir until completely dissolved, add 157g of ammonium formate (analytical pure ), and stir until completely dissolved; (2) Add 200g of ethylene glycol to (1), and stir evenly until completely dissolved; (3) Filter the mixture in (2) through a filter element with a filtration accuracy of 0.5μm to obtain this product Invented low-temperature ammonia release reducing agent products. According to the measurement, the freezing point of this example is -12°C, the appearance is clear and transparent, the element content and physical and chemical indicators all meet the requirements of GB standards, and the compatibility of plastics meets the requirements.

[0034]The test was carried out on a national 4 diesel engine bench with a displacement of 11L. After a cold start at an ambient temperat...

Embodiment 2

[0036] (1) Weigh 94g of urea (analytically pure), dissolve it in 2500g of high-purity water with a conductivity of 2mS / cm, stir and dissolve it, add 1500g of ammonium carbonate (analytical pure), stir until completely dissolved, add 82g of ammonium formate (analytical pure ), stirred until completely dissolved;

[0037] (2) Add 830g of ethanol to (1), stir evenly until completely dissolved;

[0038] (3) Pressure-filter the mixture in (2) through a filter element with a filtration accuracy of 0.8 μm to obtain the low-temperature ammonia-releasing reducing agent product of the present invention. According to the measurement, the freezing point of this example is -17°C, the appearance is clear and transparent, the element content and physical and chemical indicators all meet the requirements of GB standards, and the compatibility of plastics meets the requirements.

[0039] The test was carried out on a national 4 diesel engine bench with a displacement of 11L. After a cold star...

Embodiment 3

[0041] (1) Weigh 91g of urea (analytically pure), dissolve it in 2500g of high-purity water with a conductivity of 2mS / cm, stir and dissolve it, add 1500g of ammonium carbonate (analytical pure), stir until completely dissolved, add 103g of ammonium formate (analytical pure) ), stirred until completely dissolved;

[0042] (2) Add 800g of ethylene glycol to (1), stir evenly until completely dissolved;

[0043] (3) Pressure-filter the mixture in (2) through a filter element with a filtration accuracy of 0.5 μm to obtain the low-temperature ammonia-releasing reducing agent product of the present invention. It is determined that the freezing point of this example is -8°C, the appearance is clear and transparent, the element content and physical and chemical indicators all meet the requirements of GB standards, and the compatibility of plastics meets the requirements.

[0044] The test was carried out on a national 4 diesel engine bench with a displacement of 11L. After a cold sta...

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Abstract

The invention relates to a low-temperature condition release ammonia reducing agent composition and a preparation method thereof, and belongs to the low-temperature condition release ammonia reducing agent composition and the preparation method thereof. The composition is prepared by the following raw materials in parts by mass: 15-21 parts of ammonium carbonate, 0.79-1 part of urea, 0.80-1.57 parts of ammonium formate, 2.0-8.3 parts of low molecular alcohols, and 25-31 parts of high-purity water. Compared with a traditional urea reducing agent, the composition can release an ammonia source under a lower temperature. The obtained product can be used under the environment below -15 DEG C, and can totally satisfy normal operation of an SCR system. The freezing point of the product is -15 DEG C; and the product can be used in four reasons in the south and in spring, summer, autumn and early winter in the north.

Description

technical field [0001] The invention relates to a composition of a low-temperature ammonia-releasing reducing agent and a preparation method thereof, in particular to a low-temperature ammonia-releasing reducing agent composition and a preparation method thereof which can be used for post-treatment of automobile tail gas. Background technique [0002] As a convenient means of transportation, automobiles bring convenience to people's life and production. At the same time, automobile exhaust also causes serious pollution to the atmosphere. In terms of automobile exhaust treatment, the current international solution is SCR technology (Selective Catalytic Reduction), that is, selective catalytic reduction technology. At the same time, this technology is also the most realistic option for domestic automobile exhaust treatment in the future. The essence of SCR technology is to use urea to decompose NH at high temperature 3 , NH as reducing agent 3 It reacts with NOx in engine ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20B01D53/94
CPCY02T10/12
Inventor 张凤霞李有树于力娜米新艳崔龙王丹
Owner CHANGCHUN YONGCHANG PETROCHEM
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