CN104226093A - Composite additive of automobile urea solution - Google Patents
Composite additive of automobile urea solution Download PDFInfo
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- CN104226093A CN104226093A CN201410341756.2A CN201410341756A CN104226093A CN 104226093 A CN104226093 A CN 104226093A CN 201410341756 A CN201410341756 A CN 201410341756A CN 104226093 A CN104226093 A CN 104226093A
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- urea
- compound additive
- urea solution
- composite additive
- foaming agent
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Abstract
The invention discloses composite additive of an automobile urea solution. The composite additive comprises one or more Gemini surface active agents mixed in any ratio, wherein the content of the Gemini surface active agents in the automobile urea solution is 10ppm to 5,000ppm. The composite additive also comprises a cosurfactant and/or an anti-foaming agent. The cosurfactant is any one or a mixture of several of direct-chain alcohol polyoxyethylene ether, branch-chain alcohol polyoxyethylene ether, aliphatic amine polyoxyethylene ether and alkylphenol polyoxyethylene ether in any ratio. The anti-foaming agent is a mixture of dimethicone and one or more of C2 to C8 in any ratio. By adopting the composite additive for the urea solution, the dispersion property of urea in the urea solution can be obviously improved, the atomizing size can be reduced, the NH3 conversion efficiency can be improved, and the blockage of an SCR (selective catalytic reaction) system can be avoided.
Description
Technical field
The present invention relates to urea for vehicle solution field, particularly relating to one can improve NH
3the compound additive of the urea for vehicle solution of transformation efficiency.
Background technology
Automobile (especially diesel vehicle) exhaust emissions has become one of main source of atmospheric pollution, nitrogen oxide (NO
x) be the Main Ingredients and Appearance of vehicle exhaust.NO
xneed exhaust gas processing device to control, as: thin nitrogen oxide absorbent technology (LNT), SCR technology (SCR), oxidation catalytic converter technology (DOC), EGR+grain catcher technology (EGR+DPF) etc., SCR system is widely used in the vent gas treatment of heavy-duty diesel oil locomotive.
SCR technology is reduced the generation of particle (PM), then utilizes urea liquid to NO
xsCR catalyst carries out catalytic reduction.SCR selective catalytic reduction system operating includes 3 parts such as urea liquid supply system, urea solution jet and control system, SCR Selective catalytic reduction system.Urea liquid is deposited in vehicle-mounted special holding vessel, with the motor exhaust (about 200 ~ 500 DEG C, meet reduction reaction conditions) of pump by urea solution jet thermotropism.At high temperature, generation NH is decomposed after urea liquid gasification
3, under catalyst action, NH
3with the NO in tail gas
xreaction, generates harmless H
2o and N
2.
But due to urea bad dispersibility, decompose not exclusively, urea decomposition is NH
3intermediate product isocyanic acid (HNCO) in process is easy to urea or biuret reaction in solution, and generate and be difficult to decompose cyanuric acid, at a higher temperature, cyanuric acid is condensed into melamine further.The deposits such as undecomposed urea, cyanuric acid and melamine are attached in exhaust pipe, blender and SCR catalyst, change original gas flowfield, cause again sedimental further gathering, cause SCR system to block.SCR system blocking can directly cause automobile fuel consumption to increase, and exhaust emissions worsens, and can cause engine damage time serious.Therefore, how to avoid these deposits to generate, become the key issue that SCR system is in the urgent need to address.
Summary of the invention
In order to solve urea bad dispersibility in existing urea solution, atomization size is larger and uneven, be easy to produce deposit in SCR system, cause the problem that SCR system blocks, the invention provides a kind of compound additive for urea liquid, obviously can improve the dispersiveness of urea in urea liquid, reduce atomization size, improve NH
3transformation efficiency, thus avoid SCR system to block.
For this reason, technical scheme of the present invention is as follows:
For a compound additive for urea for vehicle solution, comprise one or more with arbitrarily than mixing Gemini surface active; The structural formula of described Gemini surface active is
Or
Or
or
Wherein: x=1 ~ 6, m=3 ~ 20, n=2 ~ 18.
The content of described Gemini surface active in described urea for vehicle solution is 10 ~ 5000ppm.
Described compound additive also comprises cosurfactant or anti-foaming agent.
Described compound additive also comprises cosurfactant and anti-foaming agent.
Described cosurfactant be in straight chain alcohol APEO, branched-chain alcoho APEO, aliphatic amine polyoxyethylene ether and APES any one or arbitrarily several with arbitrarily than mixture.
Described anti-foaming agent is dimethicone or C
2~ C
8alcohol in any one alcohol or any several alcohol with arbitrarily than mixture.
The content in described urea for vehicle solution of described cosurfactant is 100 ~ 10000ppm.
Content 0.1 ~ the 20wt% of described anti-foaming agent in described urea for vehicle solution.
Compound additive for urea for vehicle solution provided by the invention, this additive main functional component is structural formula Gemini surface active as above, this surfactant has polyoxyethylene group, its terminal hydroxy group can among each other and and the aqueous solution between form hydrogen bond, make the spacing of hydroxyl molecular ion head base more tight, thus the dispersiveness of urea can significantly be improved after adding described Gemini surface active in urea for vehicle solution; And the effect of cosurfactant is the dispersiveness improving urea in urea liquid under Gemini surface active existent condition further; The effect of anti-foaming agent eliminates when having surfactant to exist, a large amount of bubbles that solution produces.
Add compound additive provided by the invention in urea for vehicle solution after, the average diameter of SCR device spray droplet can be effectively reduced, improve atomizing effect, increase the contact area of urea and air, thus improve NH
3transformation efficiency.Decrease urea for vehicle solution use amount to a certain extent, and the sedimental generations such as biuret, cyanuric acid and melamine can be prevented, avoid SCR system to block.
Detailed description of the invention
Below in conjunction with embodiment, technical scheme of the present invention is described in detail.
Embodiment 1
Urea for vehicle solution is designated as S
0, wherein the mass fraction of urea is 32.5%; Then the compound additive S that interpolation four kinds is different respectively wherein
1, S
2, S
3and S
4; As Table I changes S in urea liquid
1, S
2, S
3and S
4concentration, measure its surface tension respectively and be listed in Table I.
Wherein: S
1, S
2, S
3and S
4structural formula as follows:
Table I Gemini surface active is on the impact of urea for vehicle solution surface tension
From Table I, along with surfactant concentration raises, urea liquid surface tension declines, the increased activity of surfactant, energy barrier required when low surface tension reduces Solution Dispersion, is conducive to the dispersion force improving urea liquid.
Embodiment 2
Use laser-Doppler dynamic particles analyzer (PDA) respectively to blank urea for vehicle solution and add compound additive S described in embodiment 1
1, S
2, S
3or S
4urea for vehicle solution carry out testing spraying characteristic.
In urea liquid, the mass concentration of urea is 32.5%, the content of compound additive is 100ppm.
Spray axis is chosen five cross sections, each section selection 5 measurement points, calculate the average diameter of drop, experimental result is in table II ~ V.
Can obviously be found out by data in table: after adding compound additive, the average diameter of the drop on cross section obviously diminishes.
Table II compound additive S
1spray characteristics is affected
Table III compound additive S
2spray characteristics is affected
Table IV compound additive S
3spray characteristics is affected
Table V compound additive S
4spray characteristics is affected
Embodiment 3
Join the urea for vehicle solution that mass concentration is 32.5%, then add wherein account for its gross mass 1% methyl-silicone oil, 200ppm hexadecanol APEO (ethoxy radix is 5), then add S described in the embodiment 1 of concentration as shown in table VI wherein respectively
1, S
2, S
3and S
4.
The solution prepared is applied to respectively the platform experiment of engine, experimental temperature is between 250 DEG C ~ 280 DEG C, and the impact that the addition measuring compound additive reduces SCR system sediment yield, the results are shown in table VI.
The impact that the addition of table VI compound additive reduces sediment yield
Embodiment 4
Join the urea for vehicle solution that mass concentration is 32.5%, then add wherein account for its gross mass 1% octanol, 0.05% OPEO (ethoxy radix is 10), then add S described in embodiment 1 that total concentration is 400ppm wherein
1, S
2, S
3and S
4mixture;
Use laser-Doppler dynamic particles analyzer (PDA) respectively to blank urea for vehicle solution with add said mixture solution and carry out testing spraying characteristic, solution records particle diameter as shown in table VII through nanospray experiment;
Above-mentioned solution is applied to the platform experiment of engine, experimental temperature is between 250 DEG C ~ 280 DEG C, and the impact that the addition measuring compound additive reduces SCR system sediment yield, the results are shown in table VIII.
Table VII additive package S
1+ S
2+ S
3+ S
4spray characteristics is affected
The impact that the addition of table VIII mixed surfactant (400ppm) agent reduces sediment yield
| Surfactant | S 1 | S 1+S 2 | S 1+S 3 | S 2+S 4 | S 1+S 2+S 3+S 4 |
| Deposit slip (%) | 53 | 52 | 48 | 45 | 43 |
Claims (8)
1., for a compound additive for urea for vehicle solution, it is characterized in that: comprise one or more with arbitrarily than mixing Gemini surface active; The structural formula of described Gemini surface active is
Or
Or
or
Wherein: x=1 ~ 6, m=3 ~ 20, n=2 ~ 18.
2. compound additive as claimed in claim 1, is characterized in that: the content of described compound additive in described urea for vehicle solution is 10 ~ 5000ppm.
3. compound additive as claimed in claim 1, is characterized in that: described compound additive also comprises cosurfactant or anti-foaming agent.
4. compound additive as claimed in claim 1, is characterized in that: described compound additive also comprises cosurfactant and anti-foaming agent.
5. the compound additive as described in claim 3 or 4, is characterized in that: described cosurfactant be in straight chain alcohol APEO, branched-chain alcoho APEO, aliphatic amine polyoxyethylene ether and APES any one or arbitrarily several with arbitrarily than mixture.
6. the compound additive as described in claim 3 or 4, is characterized in that: described anti-foaming agent is dimethicone or C
2~ C
8alcohol in any one alcohol or any several alcohol with arbitrarily than mixture.
7. the compound additive as described in claim 3 or 4, is characterized in that: the content in described urea for vehicle solution of described cosurfactant is 100 ~ 10000ppm.
8. the compound additive as described in claim 3 or 4, is characterized in that: the content 0.1 ~ 20wt% of described anti-foaming agent in described urea for vehicle solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410341756.2A CN104226093A (en) | 2014-07-17 | 2014-07-17 | Composite additive of automobile urea solution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410341756.2A CN104226093A (en) | 2014-07-17 | 2014-07-17 | Composite additive of automobile urea solution |
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| Publication Number | Publication Date |
|---|---|
| CN104226093A true CN104226093A (en) | 2014-12-24 |
Family
ID=52215525
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|---|---|---|---|
| CN201410341756.2A Pending CN104226093A (en) | 2014-07-17 | 2014-07-17 | Composite additive of automobile urea solution |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106039996A (en) * | 2016-06-28 | 2016-10-26 | 许江煌 | Adblue and preparation method thereof |
| CN106064020A (en) * | 2016-06-28 | 2016-11-02 | 许江煌 | A kind of preparation method of urea for vehicle |
| CN107051204A (en) * | 2017-05-09 | 2017-08-18 | 东莞蔚蓝环保科技有限公司 | A kind of preparation technology of urea for vehicle solution |
| CN107663449A (en) * | 2016-07-28 | 2018-02-06 | 安庆五宁精细化工有限责任公司 | A kind of efficient cleanup additive of nano emulsion type |
| CN108367239A (en) * | 2015-12-02 | 2018-08-03 | 道达尔销售服务公司 | The composition prepared by urea for handling exhaust gas |
| CN108409957A (en) * | 2017-12-07 | 2018-08-17 | 天津工业大学 | A kind of urea for vehicle solution fluorocarbon surfactant |
| CN108499360A (en) * | 2018-04-14 | 2018-09-07 | 长沙小新新能源科技有限公司 | A kind of urea for vehicle and preparation method thereof containing catalyst |
| CN112791587A (en) * | 2020-12-31 | 2021-05-14 | 温州君怡化工贸易有限公司 | High-atomization automotive urea solution and preparation method thereof |
Citations (1)
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|---|---|---|---|---|
| CN102665873A (en) * | 2009-10-16 | 2012-09-12 | 普罗帕博尔特公司 | Additive to urea solutions |
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2014
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Patent Citations (1)
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|---|---|---|---|---|
| CN102665873A (en) * | 2009-10-16 | 2012-09-12 | 普罗帕博尔特公司 | Additive to urea solutions |
Non-Patent Citations (3)
| Title |
|---|
| 刘荣等: "壬基酚聚氧乙烯醚双子表面活性剂的合成", 《石油化工》, vol. 37, no. 10, 31 December 2008 (2008-12-31), pages 1040 * |
| 徐念: "烷基酚双子表面活性剂的合成及其性能研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》, no. 8, 15 August 2009 (2009-08-15) * |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108367239A (en) * | 2015-12-02 | 2018-08-03 | 道达尔销售服务公司 | The composition prepared by urea for handling exhaust gas |
| CN106039996A (en) * | 2016-06-28 | 2016-10-26 | 许江煌 | Adblue and preparation method thereof |
| CN106064020A (en) * | 2016-06-28 | 2016-11-02 | 许江煌 | A kind of preparation method of urea for vehicle |
| CN106064020B (en) * | 2016-06-28 | 2018-10-23 | 许江煌 | A kind of preparation method of urea for vehicle |
| CN107663449A (en) * | 2016-07-28 | 2018-02-06 | 安庆五宁精细化工有限责任公司 | A kind of efficient cleanup additive of nano emulsion type |
| CN107051204A (en) * | 2017-05-09 | 2017-08-18 | 东莞蔚蓝环保科技有限公司 | A kind of preparation technology of urea for vehicle solution |
| CN108409957A (en) * | 2017-12-07 | 2018-08-17 | 天津工业大学 | A kind of urea for vehicle solution fluorocarbon surfactant |
| CN108499360A (en) * | 2018-04-14 | 2018-09-07 | 长沙小新新能源科技有限公司 | A kind of urea for vehicle and preparation method thereof containing catalyst |
| CN112791587A (en) * | 2020-12-31 | 2021-05-14 | 温州君怡化工贸易有限公司 | High-atomization automotive urea solution and preparation method thereof |
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