Comb-shaped polyacrylamide crystal growth disrupting agent, crystallization-resistant type tail gas catalytic reducing agent prepared from disrupting agent and preparation method

The technology of polyacrylamide and interfering agent is applied in the field of anti-crystallization type tail gas catalytic reducing agent and its preparation field, which can solve the problems of crystallization blockage at pipeline vortex, pipeline crystallization, nozzle blockage and the like, and achieves a simple, easy, and prolonged preparation method. Red light cycle, the effect of reducing the force

Active Publication Date: 2016-06-22
KELAS ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the long-mileage use of urea for vehicles, a series of problems gradually appeared, such as blockage of the nozzle of the SCR system, crystallization blockage at the vortex of the pipeline, crystallization of the pipeline, and frequent lighting of SCR fault lights, which caused the SCR system to fail to work normally. Only by disposing of the crystals at the nozzle can the SCR system run normally, so that the exhaust emission can reach the standard

Method used

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  • Comb-shaped polyacrylamide crystal growth disrupting agent, crystallization-resistant type tail gas catalytic reducing agent prepared from disrupting agent and preparation method
  • Comb-shaped polyacrylamide crystal growth disrupting agent, crystallization-resistant type tail gas catalytic reducing agent prepared from disrupting agent and preparation method
  • Comb-shaped polyacrylamide crystal growth disrupting agent, crystallization-resistant type tail gas catalytic reducing agent prepared from disrupting agent and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The composition distribution ratio of the anti-crystallization catalytic reducing agent is shown in Table 1.

[0018] The composition table of table 1 catalytic reducing agent

[0019] components

Mass percentage / %

Mass / kg

Adblue

95.855

47.927

crystal growth disruptor

0.010

0.005

Triethanolamine

4.000

2.000

pure water

0.135

0.068

total

100

50

[0020] Wherein, m=35, n=15, x=10, x:y=1:18.

[0021] The preparation steps of the present invention are as follows: (1) dissolving: add Adblue, crystal growth disruptor and triethanolamine respectively in the dissolving tank according to the ratio in Table 1, mix and stir, and make the tail gas catalytic reducing agent primary product; (2) Purification: filter and purify the first product of the tail gas catalytic reduction agent through a bag filter with a filtration accuracy of 10 microns, and the filtration flow rate is 2m 3 / H...

Embodiment 2

[0023] The component distribution ratio of anti-crystallization type catalytic reducing agent is shown in table 2

[0024] The composition table of table 2 catalytic reducing agent

[0025]

[0026]

[0027] Wherein, m=30, n=10, x=12, x:y=1:16.

[0028] The preparation steps are as follows: (1) Dissolving: add Adblue, crystal growth disruptor and ethanolamine respectively into the dissolving tank according to the proportions in Table 2, mix and stir to prepare the primary tail gas catalytic reducer; (2) Purify: dissolve the The primary product of the tail gas catalytic reduction agent is filtered and purified through a mechanical filter, and the filtration flow rate is 3m 3 / H to obtain the filtered tail gas catalytic reductant, and then carry out membrane separation by NF technology to obtain the separated tail gas catalytic reductant; (3) make: add 2.776kg of pure water in metering, adjust its total nitrogen content to be 0.155, and make A crystalline tail gas cataly...

Embodiment 3

[0030] The component distribution ratio of anti-crystallization type catalytic reducing agent is shown in table 3

[0031] The composition table of table 3 catalytic reducing agent

[0032] components

Mass percentage / %

Mass / kg

Adblue

86.182

43.091

crystal growth disruptor

1.000

0.500

monoisopropanolamine

10.000

5.000

Ultra-pure water

2.818

1.409

total

100

50

[0033] Wherein, m=40, n=20, x=8, x:y=1:20.

[0034] The preparation steps are as follows: (1) Dissolving: Add Adblue, crystal growth disruptor and monoisopropanolamine into the dissolving tank respectively according to the proportions in Table 3, mix and stir to make the primary exhaust gas catalytic reducer; (2) Purification: filter and purify the exhaust gas catalytic reducing agent primary product through a precision filter element filter with a filtration accuracy of 0.45 microns to obtain the filtered exhaust catalyt...

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Abstract

The invention discloses a comb-shaped polyacrylamide crystal growth disrupting agent, a crystallization-resistant type tail gas catalytic reducing agent prepared from the disrupting agent and a preparation method. The growth disrupting agent is polyacrylamide-co-polyoxyethylene polyoxypropylene methacrylic acid ester, and the tail gas catalytic reducing agent comprises a dispersing agent, Adblue, the crystal growth disrupting agent and the balance of pure water. The preparation method of the crystal growth disrupting agent comprises steps as follows: the crystal growth disrupting agent, the dispersing agent and Adblue are uniformly mixed, purified and separated, and the total nitrogen is regulated. The comb-shaped polyacrylamide crystal growth disrupting agent has the advantages as follows: the prepared crystal growth disrupting agent can effectively inhibit urea crystal growth, the tail gas catalytic reducing agent prepared through combination with the dispersing agent and the like can effectively reduce acting force between urea molecules, the precipitation time and the precipitation quantity of urea crystals are controlled, the red-light-on period caused by crystallization when the urea solution is adopted by vehicles meeting the national IV-stage emission standard is greatly prolonged, and meanwhile, the preparation method is easy and practicable and is implemented easily.

Description

technical field [0001] The invention belongs to the field of automobile exhaust catalytic reducing agents, in particular to an anti-crystallization exhaust catalytic reducing agent and a preparation method thereof. Background technique [0002] Global energy shortages, climate warming, and environmental protection are becoming increasingly severe. The harm of nitrogen oxides (NOx) and particulate matter (PM) emitted by diesel vehicles to human health and the atmospheric environment has attracted great attention. At present, the world's major developed countries are in full swing to introduce more stringent vehicle exhaust emission control standards. [0003] A large number of experimental studies have shown that the current selective catalytic reduction technology can solve the exhaust emission problem of diesel vehicles, and this technology must use an exhaust catalytic reduction agent (commonly known as vehicle urea solution) to treat the NOx in the exhaust gas. Catalyti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01D53/56
CPCB01D53/9409B01D2251/2067B01D2258/012
Inventor 石俊峰秦建严军表
Owner KELAS ENVIRONMENTAL PROTECTION TECH CO LTD
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