CN102213125A - Urea reducing agent composition with improved low-temperature performance - Google Patents
Urea reducing agent composition with improved low-temperature performance Download PDFInfo
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- CN102213125A CN102213125A CN2011101346997A CN201110134699A CN102213125A CN 102213125 A CN102213125 A CN 102213125A CN 2011101346997 A CN2011101346997 A CN 2011101346997A CN 201110134699 A CN201110134699 A CN 201110134699A CN 102213125 A CN102213125 A CN 102213125A
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Abstract
The invention relates to a urea reducing agent composition with improved low-temperature performance. The urea reducing agent composition consists of components A, B and C. The urea reducing agent composition is characterized in that: the component A is urea; the component B is ammoniums; the component C is high-purity water; and the components A, B and C are mixed in a certain proportion. Compared with the conventional urea reducing agent, the urea reducing agent composition with the improved low-temperature performance has a freezing point of lower than minus 15 DEG C and is applicable for use in south in winter.
Description
Technical field:
The present invention relates to a kind of carbamide reducing agent composition that improves cryogenic property, this technology is applied to the reprocessing industry of vehicle exhaust.
Background technique:
In the coming years, the car manufactures, particularly US and European in the whole world will forcibly be implemented some severeer specifications about the emission compliance aspect of automobile nitrogen oxide NOX and particulate PM, for example, and Europe 5 and Europe 6 emission standards.Under the pressure of Abgasgesetz, external automobile-used heavy-duty diesel engine just constantly carries out technology upgrading and improvement on the one hand, on the other hand, select appropriate post-processing technology strategy and equipment, for example, SCR (Selective Catalytic Reduction) catalyzed conversion reduction technique, DPF (Diesel Particulate Filter) particle trap, DOC (Diesel Oxidation Catalyst) oxidation catalyst etc.
The essence of SCR technology is to utilize urea at high temperature to decomposite NH3, reacts under the comprehensive function of catalyzer and temperature as the NH3 and the NOX in the engine exhaust of reducing agent, generates nontoxic N2 and H2O under the desirable operating mode, thereby reaches the purpose of purification.At present, Ou Zhou most of MANUFACTURER have begun to adopt the SCR technology to realize Europe 4 and Europe 5 standards.
SCR has lot of advantages, for example, can have 50～85% NOX removal efficient in the scope of 250～550 ℃ of delivery temperatures, and can effectively reduce the emission level of PM; SCR can easily satisfy Europe 4 and Europe 5 levels, also has the potentiality that reach Europe 6 levels; The SCR technology that adopt in Europe 4, the fuel oil consumption of motor can reduce by 3～6%; The SCR catalyzer does not contain precious metal, and is more relatively low than cost; SCR is to the quality of fuel oil for vehicles, and particularly Sulpher content is insensitive.Based on above analysis, the SCR post-processing technology is the vehicle condition and the fuel oil for vehicles situation of suitable China also.
If apply the vehicle-mounted SCR post-processing technology, must resolve the vital technological difficulties such as atomized spray, SCR catalyzer conversion efficiency, ammonia amount of leakage of dosage, the carbamide reducing agent of carbamide reducing agent supply, carbamide reducing agent in China.The premises all relates to the problem of carbamide reducing agent.In these problems, the freezing point of carbamide reducing agent is a key point.At present, the reducing agent freezing point of traditional urea liquid about-11 ℃, this means and use the vehicle of SCR technology can not run the Shanhai Pass northwards winter all that obviously be intolerable this today for traffic prosperity like this.
Solve the in-problem method of traditional carbamide reducing agent, generally all be at traditional reductant solution system's additional antifreeze liquid circulation heating or electrically heated system and heat-insulation system, add-on parts such as heating pipe loop, temperature transducer, thermal insulation layer have promptly been increased, not only per car has increased about 1200 yuan cost, also increased the complexity of system undoubtedly, the rate of fault height, in addition, need the idling of vehicle certain hour during winter cycling start, after the temperature rising Deng engine coolant, rely on circulating cooling liquid to melt the shortcomings such as urea of having frozen.Discover that exploitation lower freezing point reductant solution is imperative.
Retrieval finds that the achievement in research of improving the reductant solution freezing point comprises the patent 20090031713 " ANTIFREEZING UREA SOLUTION FOR UREA SCR SYSTEM AND UREA SCR SYSTEM USING THE SAME " of Japan and the product Denoxium-30 in Europe.That Japan Patent 20090031713 adopts is C
1～C
7Alcohols as the freezing point improver, its adding quantity is with (water+C
1～C
7Alcohols+urea)/C
1～C
7The ratio of adding quantity of alcohols limit, ratio is 7/1, calculates in theory, the density of suppose ethanol under 20 ℃ of temperature is 0.789kg/L, the adding quantity of reckoning alcohols is less than 10%wt; If adopt methyl alcohol or ethanol to implement, actual detected shows that its freezing point can not reach described-30 ℃, and supposition should be to have added isopropanol or ethylene glycol, and perhaps the inventor has a mind to imply certain composition or addition; Inventor about this point 20090031713 patents does not describe.Therefore, the core of foregoing invention is not in claim scope described in the invention.
Summary of the invention:
A kind of carbamide reducing agent composition that improves cryogenic property, by the A component, B component and C component are formed; It is characterized in that: component A is a urea, and B component is the ammonium class, and component C is a high purity water; Wherein, component A accounts for 25～30 parts of mixture gross mass, and B component accounts for 5 parts～10 parts of mixture gross mass, and component C accounts for 60 parts～70 parts of mixture gross mass.
The urea purity requirement height of component A needs to adopt the urea that satisfies GB/T696-1994 " chemical reagent-urea " standard-required, and molecular formula is CO (NH2) 2, effective element N content 46%, and decomposition temperature is 131 ℃～135 ℃; B component requires to analyzing pure, or the chemical products of suitable purity, be to be used for part to substitute the precursor composition that can discharge NH3 of urea, requirement can normally be decomposed in the engine exhaust temperature scope and do not stayed residue, the component B that recommends is an ammonium formate, and it is stable that it stores chemical property, and molecular formula is NH4HCOO, effective element N content is 21.67%, resolves into NH3 and HCOOH/CO+H2O under 180 ℃; The purity requirement of the water of component C is higher, and the micro-content organism in the water, chlorion and metal ion all are the hazardous materials of SCR post-processing catalyst, and therefore, component C is a high-purity water, is 3 class water quality after purified water or distilled water are handled through reverse osmosis again.
Good effect of the present invention is: the composition to traditional carbamide reducing agent carries out basic improvement, has significantly improved the cryogenic property of pure carbamide reducing agent solution, has very high use value.
Embodiment:
Embodiment 1
Choosing high purity urea component A is 28 parts, and analyzing pure ammonium formate B component is 9 parts, and high-purity water component C is 63 parts; After stirring at room was molten extremely entirely, adopting filter precision was the filter core pressure filtration of 5 μ m, is mixture solution of the present invention.After measured, mixture solution freezing point-17 ℃, tasteless, outward appearance is as clear as crystal, and density is 1.062g/cm
3, Biuret Content 0.03%, impurity content all meets standard-required, and Compatibility in Plastics meets the demands; Behind the room temperature storage 48h, outward appearance, smell do not have the perceptible variation of sense organ, and it is all qualified that performance index detect.
Be to carry out the ESC working condition measurement on 8.6 liters the diesel engine stand in discharge capacity, this reducing agent is under specified discharge rate, and after handling through the SCR preprocessor, the NOX discharging can reach state's 4 requirements.
Embodiment 2
Choosing high purity urea component A is 29 parts, and analyzing pure ammonium formate B component is 7 parts, and high-purity water component C is 64 parts; After stirring at room was molten extremely entirely, adopting filter precision was the filter core pressure filtration of 5 μ m, is mixture solution of the present invention.After measured, mixture solution freezing point-16 ℃, tasteless, outward appearance is as clear as crystal, and density is 1.063g/cm
3, Biuret Content 0.03%, impurity content all meets standard-required, and Compatibility in Plastics meets the demands; Behind the room temperature storage 48h, outward appearance, smell do not have the perceptible variation of sense organ, and it is all qualified that performance index detect.
Be to carry out the ESC working condition measurement on 8.6 liters the diesel engine stand in discharge capacity, this reducing agent is under specified discharge rate, and after handling through the SCR preprocessor, the NOX discharging can reach state's 4 requirements.
Embodiment 3
Choosing high purity urea component A is 30 parts, and analyzing pure ammonium formate B component is 5 parts, and high-purity water component C is 65 parts; After stirring at room was molten extremely entirely, adopting filter precision was the filter core pressure filtration of 5 μ m, is mixture solution of the present invention.After measured, mixture solution freezing point-15 ℃, tasteless, outward appearance is as clear as crystal, and density is 1.064g/cm
3, Biuret Content 0.03%, impurity content all meets standard-required, and Compatibility in Plastics meets the demands; Behind the room temperature storage 48h, outward appearance, smell do not have the perceptible variation of sense organ, and it is all qualified that performance index detect.
Be to carry out the ESC working condition measurement on 8.6 liters the diesel engine stand in discharge capacity, this reducing agent is under specified discharge rate, and after handling through the SCR preprocessor, the NOX discharging can reach state's 4 requirements.
Claims (3)
1. carbamide reducing agent composition that improves cryogenic property, by the A component, the B component, the C component is formed; It is characterized in that: component A is a urea, and B component is the ammonium class, and component C is a high purity water; Wherein, component A accounts for 25～30 parts of mixture gross mass, and B component accounts for 5 parts～10 parts of mixture gross mass, and component C accounts for 60 parts～70 parts of mixture gross mass.
2. a kind of carbamide reducing agent composition that improves cryogenic property according to claim 1 is characterized in that the ammonium class component of described mixture is an ammonium formate.
3. a kind of carbamide reducing agent composition that improves cryogenic property according to claim 1, it is characterized in that described preparation process of mixture is as follows: component A, B component and component C are mixed in above-mentioned ratio, at room temperature be stirred to complete molten after, filter and be finished product.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101346997A CN102213125A (en) | 2011-05-24 | 2011-05-24 | Urea reducing agent composition with improved low-temperature performance |
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| CN2011101346997A CN102213125A (en) | 2011-05-24 | 2011-05-24 | Urea reducing agent composition with improved low-temperature performance |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104147926A (en) * | 2014-08-03 | 2014-11-19 | 长春市永畅实业有限责任公司 | Reducing agent mixture capable of releasing ammonia at low temperature |
| CN104675483A (en) * | 2015-01-13 | 2015-06-03 | 四川美丰化工股份有限公司 | Low-freezing-point nitric oxide reducing agent and preparation method thereof |
| CN105498537A (en) * | 2015-11-30 | 2016-04-20 | 许昌学院 | Low-temperature diesel exhaust reducing agent and preparation method thereof |
| CN107587922A (en) * | 2017-10-13 | 2018-01-16 | 锦西天然气化工有限责任公司 | A kind of ultralow temperature urea for vehicle solution and preparation method thereof |
| CN108636116A (en) * | 2018-04-23 | 2018-10-12 | 河南宗源环保科技有限公司 | A kind of antifreeze type automobile urea solution of guaranteeing the quality |
| CN110394058A (en) * | 2018-08-22 | 2019-11-01 | 山西思淼环保技术开发有限公司 | A kind of urea for vehicle and preparation method thereof that will not be crystallized |
| CN113578050A (en) * | 2021-08-10 | 2021-11-02 | 山东永豪发展集团有限公司 | Tail gas treatment liquid for diesel vehicle and preparation method thereof |
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|---|---|---|---|---|
| US5057293A (en) * | 1987-02-13 | 1991-10-15 | Fuel Tech, Inc. | Multi-stage process for reducing the concentration of pollutants in an effluent |
| JPH08323151A (en) * | 1995-06-05 | 1996-12-10 | Tokyo Gas Co Ltd | Method for purifying waste gas containing nitrogen oxides |
| WO2006013229A1 (en) * | 2004-08-04 | 2006-02-09 | Kemira Oyj | Reducing agent composition |
| CN1747777A (en) * | 2003-02-04 | 2006-03-15 | 凯米罗总公司 | Catalytic process for reducing nitrogen oxides in flue gases and reducing agent composition |
| DE102007062594A1 (en) * | 2007-12-22 | 2009-07-02 | Audi Ag | Urea contained reducing agent solution's i.e. diesel emissions fluid, freezing point reducing method for commercial motor vehicle i.e. passenger car, involves producing ammonium compound by increasing temperature of volume of solution |
-
2011
- 2011-05-24 CN CN2011101346997A patent/CN102213125A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5057293A (en) * | 1987-02-13 | 1991-10-15 | Fuel Tech, Inc. | Multi-stage process for reducing the concentration of pollutants in an effluent |
| JPH08323151A (en) * | 1995-06-05 | 1996-12-10 | Tokyo Gas Co Ltd | Method for purifying waste gas containing nitrogen oxides |
| CN1747777A (en) * | 2003-02-04 | 2006-03-15 | 凯米罗总公司 | Catalytic process for reducing nitrogen oxides in flue gases and reducing agent composition |
| WO2006013229A1 (en) * | 2004-08-04 | 2006-02-09 | Kemira Oyj | Reducing agent composition |
| DE102007062594A1 (en) * | 2007-12-22 | 2009-07-02 | Audi Ag | Urea contained reducing agent solution's i.e. diesel emissions fluid, freezing point reducing method for commercial motor vehicle i.e. passenger car, involves producing ammonium compound by increasing temperature of volume of solution |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104147926A (en) * | 2014-08-03 | 2014-11-19 | 长春市永畅实业有限责任公司 | Reducing agent mixture capable of releasing ammonia at low temperature |
| CN104675483A (en) * | 2015-01-13 | 2015-06-03 | 四川美丰化工股份有限公司 | Low-freezing-point nitric oxide reducing agent and preparation method thereof |
| CN105498537A (en) * | 2015-11-30 | 2016-04-20 | 许昌学院 | Low-temperature diesel exhaust reducing agent and preparation method thereof |
| CN107587922A (en) * | 2017-10-13 | 2018-01-16 | 锦西天然气化工有限责任公司 | A kind of ultralow temperature urea for vehicle solution and preparation method thereof |
| CN108636116A (en) * | 2018-04-23 | 2018-10-12 | 河南宗源环保科技有限公司 | A kind of antifreeze type automobile urea solution of guaranteeing the quality |
| CN110394058A (en) * | 2018-08-22 | 2019-11-01 | 山西思淼环保技术开发有限公司 | A kind of urea for vehicle and preparation method thereof that will not be crystallized |
| CN113578050A (en) * | 2021-08-10 | 2021-11-02 | 山东永豪发展集团有限公司 | Tail gas treatment liquid for diesel vehicle and preparation method thereof |
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Application publication date: 20111012 |