CN107178408A - A kind of ultralow temperature diesel vehicle urea liquid and preparation method thereof - Google Patents
A kind of ultralow temperature diesel vehicle urea liquid and preparation method thereof Download PDFInfo
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- CN107178408A CN107178408A CN201710408443.8A CN201710408443A CN107178408A CN 107178408 A CN107178408 A CN 107178408A CN 201710408443 A CN201710408443 A CN 201710408443A CN 107178408 A CN107178408 A CN 107178408A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention provides a kind of ultralow temperature diesel vehicle urea liquid and preparation method thereof, wherein ultralow temperature diesel vehicle urea liquid, including following each component：Component A, component B, component C and component D；The component A is high purity water, and component B is urea, and component C is small molecule solid amide substance, and component D is small molecule alcohol material；The parts by weight of each component are：5~40 parts of 40~70 parts of component A, 20~35 parts of component B, 5~25 parts of component C and component D.A kind of ultralow temperature diesel vehicle urea liquid of the present invention, formula and preparation method are simple, it is easy to operate, because modifier component is simple, it is not introduced into the composition of limited content, every quality index is qualified, product freezing point is at 25 DEG C~55 DEG C, and surface tension is significantly less than common urea reducing agent, is adapted to each season of the South and the North, especially the Northeast pole cold season uses, with very high value for applications.
Description
Technical field
It is molten more particularly, to a kind of ultralow temperature diesel oil urea for vehicle the invention belongs to diesel motor exhaust process field
Liquid and preparation method thereof.
Background technology
In recent years, often to the winter is entered, central and east the greater part haze takes place frequently, and haze number of days is universal more than 5 days, and national mist
Overall haze day is in increase trend.Especially nearly 2 years, the haze weather duration is longer, such as, Beijing air day up to standard in 2015
Number be only 186 days, 2016, Beijing air in November number of days up to standard less than 5 into.Haze is to the suspended particulate substance of hundreds of in air
The general statement of content overproof, especially PM2.5 (equivalent aerodynamic diameter is less than or equal to 2.5 microns of particulate matter) is recognized
To be to cause haze weather " arch-criminal ".Research shows that motor vehicle exhaust emission accounts for about the 30% of the national PM2.5 total amount of pollutant,
It is to cause one of China's haze weather " chief culprit ", wherein, the tail gas pollution from heavy-duty diesel vehicle is up to more than 2/3rds.
Data display, the nitrogen oxides and PM pollutants of the emission of diesel engine of Jin Zhan China car ownership 17%, accounts for motor vehicle respectively
The 60% of total emission volumn and more than 90%.To mitigate the pollution that is caused to atmospheric environment of vehicle exhaust, China has carried out in an all-round way state
Four discharge standards.
On May 15th, 2014, State Council's issue《2014-2015 energy-saving and emission-reduction low carbon development action schemes》, it is indicated that arrive
Before the end of the year in 2014, in the national standard derv fuel of supply country four.During 2014 " 11 ", including Jiangsu, Fujian, Sichuan
Multiple provinces Deng including, have all issued the oily popularization policy of respective state four.Ministry of Industry and Information was announced from 1 day January in 2015, national
In the range of diesel vehicle will enforce state IV discharge standards.It is domestic with the promotion and implementation of derv fuel state IV discharge standards
Urea for vehicle market development has welcome new opportunity.Although this market was at the early-stage in recent years, domestic demand has a high potential, car
It can be increased rapidly with urea sales volume.
The main pollutant effulent of Diesel engine is NOx (nitrogen oxides) and PM (particulate), and China is due to national conditions, oil product
Etc. the influence of factor, upgrading state four uses SCR routes.The engine of SCR technology route is taken during burning,
Diesel oil is set fully to burn by technological means so as to reach the target of effectively control PM discharge capacitys, and NOx is then needed in exhaust
During be reduced to nitrogen (N2) and water (H2O), reducing agent is exactly urea for vehicle solution necessary to this process.Tail gas from
Turbocharger enters blast pipe after coming out, and is provided with urea measuring and injecting device on blast pipe, temperature reach 300 DEG C~
Urea liquid is sprayed at 500 DEG C, the urea (NH in the presence of catalyst2CONH2) hydrolysis generation NH3And CO2, NH3It is anti-with NOx
Should, generation nitrogen and water discharge, while absorbing harmful flue gas particle.
The purity and purity requirements of urea for vehicle solution are higher, relative to industrial urea, biuret, insoluble matter, iron, sulphur
The content of compound, chloride etc. has strict requirements.Because metal ion poisoning easily occurs for SCR catalyst carrier so as to lose
Catalytic effect is removed, therefore urea for vehicle solution must use electronics industry one-level ultra-pure water.Current urea for vehicle solution it is general by
32.5% high-purity urea and 67.5% ultra-pure water composition.The urea liquid crystalline temperature of this concentration is minimum, less than -11 DEG C
When can crystallize, can completely be freezed at -20 DEG C in actual use, make it in the north especially under the winter cold snap such as northeast
Use be restricted.The freezing point for adding modifying agent reduction urea for vehicle solution is the method for most convenient and low cost, but by
In SCR catalyst to urea for vehicle solution purity and the high request of cleanliness factor, the metal salt of aqueous solution freezing point can be substantially reduced
It can not use so that the range of choice of modifying agent is very limited, inorganic salts can only select ammonium material substantially, organic modifiers are big
More options amine or amide substance.
Retrieval is found, using urea as ammonia source, and the existing patent for adding modifying agent improvement freezing point is relatively more, but is mostly ammonium class
Material, such as ammonium formate, ammonium carbonate, ammonium hydrogen carbonate, when the content is higher, CO2Detected level it is easily exceeded, and stability is poor, holds
Easily decompose.Chinese patent CN201110134706.3《A kind of low-temperature urea reducing agent composition》、CN201110134698.2《One
Plant ultralow-temperature urea reducing agent composition》、CN201510015958《A kind of low freezing point NOx reducing agent and its preparation side
Method》With CN 201510017530《A kind of ultralow freezing point NOx reducing agent and preparation method thereof》Amide-type thing is all used
Matter.To ensure low-carbon, low viscosity, small molecule amide substance is often selected, small molecule acid amides has liquid and the class of solid two.It is above-mentioned
In four publications, all clearly indicated in letter of authorization or specification, selected amide-type is liquid formamide, its freezing point
(or fusing point, freezing point) is 2.6 DEG C.Formamide has combustibility, in the presence of a catalyst, is heated to less than 35 DEG C, decomposable asymmetric choice net
Go out hypertoxicity hydrogen cyanide, and energy strong corrosion copper, brass, lead, rubber, it has not been convenient to storage and transport.
In addition small molecule alcohol has all been selected in aforementioned four publication as compound additive, but composition is relative originally special
Profit will be complicated, increases technology difficulty.In addition, wherein all containing ammonium formate, CO is easily caused2Detected level it is exceeded, during decomposition
It is also easy to produce hydrogen cyanide.Also include organic compounds containing sulfur dimethyl sulfoxide (DMSO) in CN201510015958 and CN201510017530,
Sulfide staining thing may be produced after pyrolytic.
The content of the invention
In view of this, the present invention is directed to propose a kind of ultralow temperature diesel vehicle urea liquid, to overcome prior art
Defect, can adapt to different regions spring and summer early winter in autumn and cold, pole cold season are used, and in the urea for vehicle solution materials
Solid acid amides and Alcoholic modifier it is water-miscible, can be miscible with usual organic matter, preparation method is simple, easy to operate, because
Modifier component is simple, is not introduced into the composition of limited content, therefore every quality index is qualified.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of ultralow temperature diesel vehicle urea liquid, including following each component：Component A, component B, component C and component
D；The component A is high purity water, and component B is urea, and component C is small molecule solid amide substance, and component D is small molecule alcohol
Material.
It is preferred that, the parts by weight of each component are：40~70 parts of component A, 20~35 parts of component B, 5~25 parts of component C
With 5~40 parts of component D.
It is preferred that, the parts by weight of each component are：45~65 parts of component A, 23~32 parts of component B, 8~22 parts of component C
With 7~35 parts of component D.
It is preferred that, the parts by weight of each component are：50~60 parts of component A, 26~30 parts of component B, component C 12~20
15~30 parts of part and component D.
It is preferred that, the component C is more than one or both of acetamide, diacetayl amide and triacetamide；Described group
The content for dividing C is 20 parts.
Small molecule class solid acid amides such as acetamide, colourless transparent crystal, soluble in water and ethanol, low toxicity.Although freezing point
Up to 82.3 DEG C, but experiment shows that added in common urea for vehicle after a certain amount of acetamide, the freezing point of solution significantly drops
It is low.Compared to formamide, acetamide has a clear superiority in security, stores and transports and is also convenient for much.
It is preferred that, the component D is more than one or both of methanol, ethanol and ethylene glycol.
The preferred technical grade high purity water of high purity water.
The urea need to meet GB29518-2013《Diesel engine NOx reducing agent aqueous solution of urea (AUS32)》
The technical requirements of the special urea of AUS32 in standard.
The high purity water need to meet GB29518-2013《Diesel engine NOx reducing agent aqueous solution of urea
(AUS32)》To the technical requirements of high purity water in standard.
The solid amide-type and small molecule alcohol are the product for analyzing pure ratings above.
To reduce cost, the content of solid acid amides is unsuitable too high, is advisable with 20%, some small-molecular-weights can be added simultaneously
Liquid alcohols.
Small molecule alcohol is due to very low freezing point and less density, such as methanol (- 97 DEG C, 0.792g/cm3)、
Ethanol (- 114 DEG C, 0.798g/cm3), it can make urea liquid that there is lower freezing point and viscosity.But because they are with stronger
Volatility, volatile matter is flammable strong, therefore addition can not be excessive.With solid acid amides compounding after, methanol, ethanol volatility it is bright
It is aobvious to weaken, determined after placing three months and find the freezing point of solution without being decreased obviously.Although ethylene glycol be usually used in motor vehicle antifreeze fluid
Preparation, but density is slightly larger, can increase the viscosity of urea liquid, reduces mobility, should not add excessive.In view of cost, easily
Preferred methanol in property, security and viscosity, the present invention is obtained, can also be selected according to property, effect in methanol, ethanol, ethylene glycol
Multiple combinations.
Urea for vehicle solution is during being atomized and being injected into the exhaust pipe of engine, and atomizing effect is one very crucial
The problem of.Atomizing effect is good, and the urea low particle size ejected is small, can quickly hydrolyze, be pyrolyzed, into catalyst carrier
Section, be diffused into catalyst surface, absorption, react, NH after reaction3Escape few, reduction NOx efficiency is improved.Atomizing effect is with going back
The surface tension of former agent solution has substantial connection.At room temperature, the surface tension of water is 72mN/m, traditional urea for vehicle solution
It is to be formulated using the urea and water of high-purity, its surface tension reaches more than 66mN/m, and 100% methanol or ethanol are all
In below 25mN/m, ethylene glycol is 50mN/m.It is expected that adding the surface of solution after above-mentioned substance in conventional urea solution
Power inherently declines, and the reducing agent drop ejected is smaller, so as to improve the atomizing effect of urea for vehicle solution.
Electrical conductivity also has certain influence during the use of urea liquid, and electrical conductivity is lower, solution electricity in reaction system
The flowing of lotus is slower, easily causes charge accumulated, forms electrokinetic phenomena, and electrokinetic phenomena height is also easy to produce electric spark to a certain extent,
Vehicle is potentially dangerous.Due to the basic unionization of organic amide, electrical conductivity very little is added into urea liquid and inevitably resulted in
Its electrical conductivity is reduced.Even if when addition is 20%, compared to the electrical conductivity that one-level industrial electronic water is less than 1 μ s/cm, urea is molten
The electrical conductivity of liquid is still greater than 130 μ s/cm, with certain electric conductivity.
Another object of the present invention is to propose a kind of to prepare ultralow temperature diesel vehicle urea liquid as described above
Method, to prepare above-mentioned ultralow temperature diesel vehicle urea liquid.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of method for preparing ultralow temperature diesel vehicle urea liquid as described above, comprises the following steps：
(1) component B is added in component A, it is fully dissolved, obtain clear solution；
(2) component C and component D are sequentially added in the clear solution described in step (1), is sufficiently stirred for mixing, gained is mixed
Close solution and produce ultralow temperature diesel vehicle urea liquid of the present invention.
It is preferred that, in the step (2), component C and component D are sequentially added in the clear solution described in step (1), is filled
Divide and stir and evenly mix, the filtering of gained mixed solution produces ultralow temperature diesel vehicle urea liquid of the present invention.
It is preferred that, in the step (2), after cartridge pressure filtering of the gained mixed solution through 0.5-0.8 μm, 0.6Mpa i.e.
Obtain ultralow temperature diesel vehicle urea liquid of the present invention.
It is preferred that, in the step (1), component B is added in component A, in making it fully dissolve at 35 DEG C~40 DEG C, obtained
To clear solution；In the step (2), after the clear solution in step (1) is cooled to room temperature, component C is added, component is treated
After C is completely dissolved, component D is added.
Preparation method of the present invention is applied in the preparation of Lab Products lab scale, its preparation process includes following step
Suddenly：
(1) high-purity urea is added and added in the round-bottomed flask of high purity water, after being sealed with grinding port plug, be heated to 35 DEG C~
40 DEG C, stirring to urea is completely dissolved, the transparent shape of solution；
(2) step (1) resulting solution is cooled to room temperature, adds small molecule solid amide substance, sealed with grinding port plug
Afterwards, stirring to solution is mixed thoroughly.
(3) small molecule alcohol will be added in step (2) resulting solution, is sealed with grinding port plug, stirring to solution is thoroughly mixed
Uniformly.
(4) step (3) resulting solution is filtered with the cartridge pressure that filtering accuracy is 0.8pm, 0.6Mpa, that is, obtains this hair
Bright ultralow temperature urea for vehicle product.
Preparation method of the present invention is applied in pilot scale and the preparation of commercial prod, its preparation method is：Institute
There is the proportional amplification of raw material, after strong stirring is completely dissolved to urea, sequentially add solid amide substance and small molecule alcohol
Material, strong stirring is to being mixed thoroughly, and obtained solution is after the cartridge pressure filtering through 0.5-0.8 μm, 0.6Mpa
The mixture solution of the present invention.
Relative to prior art, a kind of ultralow temperature diesel vehicle of the present invention is had the advantage that with urea liquid：
A kind of ultralow temperature diesel vehicle urea liquid of the present invention, its solid acid amides and Alcoholic modifier energy and water
It is miscible, can be miscible with usual organic matter, formula and preparation method are simple, easy to operate, because modifier component is simple, are not introduced into limit
The composition of content processed, every quality index is qualified (to reach ISO22241-1:2006 international standards, DIN 70070:2005 morals
The requirement of national standard and DB11/552-2008 Beijing standard), product freezing point is at -25 DEG C~-55 DEG C, and surface tension is significantly less than
Common in-vehicle urea liquid, being adapted to the South and the North each season, especially the Northeast pole cold season uses, and makes with very high
With and promotional value.
The detected level of a kind of ultralow temperature diesel vehicle urea liquid of the present invention, carbonate and chloride reaches
Requirement in the standard of DB11/552-2008 Beijing is (due to ISO 22241-1:2006 international standards and DIN 70070:2005 morals
National standard is not required the detected level of carbonate and chloride, therefore with reference to DB11/552-2008 Beijing standard), both
Detected level is respectively：Carbonate is (with CO2Meter) detected level≤0.2%, chloride detected level≤0.2%.
A kind of ultralow temperature diesel vehicle urea liquid of the present invention, can effectively improve traditional vehicle urea liquid mist
Change effect, improve NOxReduction efficiency.
The method for preparing ultralow temperature diesel vehicle urea liquid as described above and above-mentioned ultralow temperature diesel vehicle
Had the advantage that identical, will not be repeated here relative to prior art with urea liquid.
Embodiment
In addition to being defined, technical term used has universal with those skilled in the art of the invention in following examples
The identical meanings of understanding.Test reagent used, is routine biochemistry reagent unless otherwise specified in following examples；It is described
Experimental method, is conventional method unless otherwise specified.
The present invention is described in detail with reference to embodiment.
Embodiment 1
(1) the high-purity urea of 5.0171g is added in the round-bottomed flask for having added 10.4187g high purity waters, sealed with grinding port plug
Afterwards, heating water bath is to 40 DEG C, and magnetic agitation to urea is completely dissolved, the transparent shape of solution；
(2) step (1) resulting solution is cooled to room temperature, adds 2.6024g acetamides, after being sealed with grinding port plug, magnetic force
Stirring to solution is mixed thoroughly.
(3) 1.1564g methanol will be added in step (2) resulting solution, after being sealed with grinding port plug, magnetic agitation is complete to solution
It is complete well mixed.
(4) step (3) resulting solution is filtered with the cartridge pressure that filtering accuracy is 0.8pm, 0.6MPa, that is, obtains this hair
Bright ultralow temperature tail gas catalytic reducer product.
After measured, -25 DEG C of mixture solution freezing point, surface tension 62.5mN/m, electrical conductivity is 227 μ S/cm, and outward appearance is clear
Clear transparent, product quality indicator meets ISO 22241-I:The requirement of 2006 international standards, and carbonate and chloride detected level symbol
Close DB11/552-2008 Beijing standard；After Room-temperature seal is stored three months, outward appearance, smell are without the perceptible change of sense organ.
The product of the present embodiment is subjected to ETC, ESC on the diesel engine machine frame of 233 horsepowers of power (discharge capacity 6.5L)
Under working condition measurement, the specified discharge rate of product, after being handled through SCR aftertreatment system, NOx emission can reach state four standard.
Embodiment 2
(1) the high-purity urea of 4.9472g is added in the round-bottomed flask for having added 10.2384g high purity waters, sealed with grinding port plug
Afterwards, heating water bath is to 40 DEG C, and magnetic agitation to urea is completely dissolved, the transparent shape of solution；
(2) step (1) resulting solution is cooled to room temperature, adds 2.5547g acetamides, after being sealed with grinding port plug, magnetic force
Stirring to solution is mixed thoroughly.
(3) 2.5560g methanol will be added in step (2) resulting solution, after being sealed with grinding port plug, magnetic agitation is complete to solution
It is complete well mixed.
(4) step (3) resulting solution is filtered with the cartridge pressure that filtering accuracy is 0.8pm, 0.6MPa, that is, obtains this hair
Bright ultralow temperature tail gas catalytic reducer product.
After measured, -31 DEG C of mixture solution freezing point, surface tension 58.6mN/m, electrical conductivity is 183.4 μ S/cm, product
Quality index meets ISO 22241-I:The requirement of 2006 international standards, and carbonate and chloride detected level meet DB11/552-
2008 Beijing standards；After Room-temperature seal is stored three months, outward appearance, smell are without the perceptible change of sense organ.
The product of the present embodiment is subjected to ETC, ESC on the diesel engine machine frame of 233 horsepowers of power (discharge capacity 6.5L)
Under working condition measurement, the specified discharge rate of product, after being handled through SCR aftertreatment system, NOx emission can reach state four standard.
Embodiment 3
(1) the high-purity urea of 5.1276g is added in the round-bottomed flask for having added 10.6359g high purity waters, sealed with grinding port plug
Afterwards, heating water bath is to 40 DEG C, and magnetic agitation to urea is completely dissolved, the transparent shape of solution；
(2) step (1) resulting solution is cooled to room temperature, adds 2.6516g acetamides, after being sealed with grinding port plug, magnetic force
Stirring to solution is mixed thoroughly.
(3) 4.5582g methanol will be added in step (2) resulting solution, after being sealed with grinding port plug, magnetic agitation is complete to solution
It is complete well mixed.
(4) step (3) resulting solution is filtered with the cartridge pressure that filtering accuracy is 0.8pm, 0.6MPa, that is, obtains this hair
Bright ultralow temperature tail gas catalytic reducer product.
After measured, -42 DEG C of mixture solution freezing point, surface tension 59.2mN/m, electrical conductivity is 152.5 μ S/cm, outward appearance
As clear as crystal, product quality indicator meets ISO 22241-I:The requirement of 2006 international standards, and carbonate and chloride detected level
Meet DB11/552-2008 Beijing standard；After Room-temperature seal is stored three months, outward appearance, smell are without the perceptible change of sense organ.
The product of the present embodiment is subjected to ETC, ESC on the diesel engine machine frame of 233 horsepowers of power (discharge capacity 6.5L)
Under working condition measurement, the specified discharge rate of product, after being handled through SCR aftertreatment system, NOx emission can reach state four standard.
Embodiment 4
(1) the high-purity urea of 4.8294g is added in the round-bottomed flask for having added 10.0285g high purity waters, sealed with grinding port plug
Afterwards, heating water bath is to 40 DEG C, and magnetic agitation to urea is completely dissolved, the transparent shape of solution；
(2) step (1) resulting solution is cooled to room temperature, adds 2.5080g acetamides, after being sealed with grinding port plug, magnetic force
Stirring to solution is mixed thoroughly.
(3) 5.4008g methanol will be added in step (2) resulting solution, after being sealed with grinding port plug, magnetic agitation is complete to solution
It is complete well mixed.
(4) step (3) resulting solution is filtered with the cartridge pressure that filtering accuracy is 0.8pm, 0.6MPa, that is, obtains this hair
Bright ultralow temperature tail gas catalytic reducer product.
After measured, -48 DEG C of mixture solution freezing point, surface tension 54.5mN/m, electrical conductivity is 146.7 μ S/cm, outward appearance
As clear as crystal, product quality indicator meets ISO 22241-I:The requirement of 2006 international standards, and carbonate and chloride detected level
Meet DB11/552-2008 Beijing standard；After Room-temperature seal is stored three months, outward appearance, smell are without the perceptible change of sense organ.
The product of the present embodiment is subjected to ETC, ESC on the diesel engine machine frame of 233 horsepowers of power (discharge capacity 6.5L)
Under working condition measurement, the specified discharge rate of product, after being handled through SCR aftertreatment system, NOx emission can reach state four standard.
Embodiment 5
(1) the high-purity urea of 6.1128g is added in the round-bottomed flask for having added 12.6823g high purity waters, sealed with grinding port plug
Afterwards, heating water bath is to 40 DEG C, and magnetic agitation to urea is completely dissolved, the transparent shape of solution；
(2) step (1) resulting solution is cooled to room temperature, adds 3.1626g acetamides, after being sealed with grinding port plug, magnetic force
Stirring to solution is mixed thoroughly.
(3) 8.453g methanol will be added in step (2) resulting solution, after being sealed with grinding port plug, magnetic agitation is complete to solution
It is complete well mixed.
(4) step (3) resulting solution is filtered with the cartridge pressure that filtering accuracy is 0.8pm, 0.6MPa, that is, obtains this hair
Bright ultralow temperature tail gas catalytic reducer product.
After measured, -54 DEG C of mixture solution freezing point, surface tension 54mN/m, electrical conductivity is 128.6 μ S/cm, and outward appearance is clear
Clear transparent, product quality indicator meets ISO 22241-I:The requirement of 2006 international standards, and carbonate and chloride detected level symbol
Close DB11/552-2008 Beijing standard；After Room-temperature seal is stored three months, outward appearance, smell are without the perceptible change of sense organ.
The product of the present embodiment is subjected to ETC, ESC on the diesel engine machine frame of 233 horsepowers of power (discharge capacity 6.5L)
Under working condition measurement, the specified discharge rate of product, after being handled through SCR aftertreatment system, NOx emission can reach state four standard.
Embodiment 6
(1) the high-purity urea of 10.3200g is added in the round-bottomed flask for having added 21.4329g high purity waters, sealed with grinding port plug
After mouthful, heating water bath is to 40 DEG C, and magnetic agitation to urea is completely dissolved, the transparent shape of solution；
(2) step (1) resulting solution is cooled to room temperature, adds 5.3551g acetamides, after being sealed with grinding port plug, magnetic force
Stirring to solution is mixed thoroughly.
(3) 5.3610g ethanol will be added in step (2) resulting solution, after being sealed with grinding port plug, magnetic agitation is complete to solution
It is complete well mixed.
(4) step (3) resulting solution is filtered with the cartridge pressure that filtering accuracy is 0.8pm, 0.6MPa, that is, obtains this hair
Bright ultralow temperature tail gas catalytic reducer product.
After measured, -30 DEG C of mixture solution freezing point, surface tension 54.6mN/m, electrical conductivity is 188 μ S/cm, and outward appearance is clear
Clear transparent, product quality indicator meets ISO 22241-I:The requirement of 2006 international standards, and carbonate and chloride detected level symbol
Close DB11/552-2008 Beijing standard；After Room-temperature seal is stored three months, outward appearance, smell are without the perceptible change of sense organ.
The product of the present embodiment is subjected to ETC, ESC on the diesel engine machine frame of 233 horsepowers of power (discharge capacity 6.5L)
Under working condition measurement, the specified discharge rate of product, after being handled through SCR aftertreatment system, NOx emission can reach state four standard.
Embodiment 7
(1) the high-purity urea of 9.4921g is added in the round-bottomed flask for having added 19.7121g high purity waters, sealed with grinding port plug
Afterwards, heating water bath is to 40 DEG C, and magnetic agitation to urea is completely dissolved, the transparent shape of solution；
(2) step (1) resulting solution is cooled to room temperature, adds 4.9255g acetamides, after being sealed with grinding port plug, magnetic force
Stirring to solution is mixed thoroughly.
(3) 8.4464g ethanol will be added in step (2) resulting solution, after being sealed with grinding port plug, magnetic agitation is complete to solution
It is complete well mixed.
(4) step (3) resulting solution is filtered with the cartridge pressure that filtering accuracy is 0.8pm, 0.6MPa, that is, obtains this hair
Bright ultralow temperature tail gas catalytic reducer product.
After measured, -31 DEG C of mixture solution freezing point, surface tension 47.6mN/m, electrical conductivity is 141 μ S/cm, and outward appearance is clear
Clear transparent, product quality indicator meets ISO 22241-I:The requirement of 2006 international standards, and carbonate and chloride detected level symbol
Close DB11/552-2008 Beijing standard；After Room-temperature seal is stored three months, outward appearance, smell are without the perceptible change of sense organ.
The product of the present embodiment is subjected to ETC, ESC on the diesel engine machine frame of 233 horsepowers of power (discharge capacity 6.5L)
Under working condition measurement, the specified discharge rate of product, after being handled through SCR aftertreatment system, NOx emission can reach state four standard.
Embodiment 8
(1) the high-purity urea of 9.1268g is added in the round-bottomed flask for having added 18.9600g high purity waters, sealed with grinding port plug
Afterwards, heating water bath is to 40 DEG C, and magnetic agitation to urea is completely dissolved, the transparent shape of solution；
(2) step (1) resulting solution is cooled to room temperature, adds 4.7389g acetamides, after being sealed with grinding port plug, magnetic force
Stirring to solution is mixed thoroughly.
(3) 4.7355g ethylene glycol, after being sealed with grinding port plug, magnetic agitation to solution will be added in step (2) resulting solution
It is mixed thoroughly.
(4) step (3) resulting solution is filtered with the cartridge pressure that filtering accuracy is 0.8pm, 0.6MPa, that is, obtains this hair
Bright ultralow temperature tail gas catalytic reducer product.
After measured, -27 DEG C of mixture solution freezing point, surface tension 66.2mN/m, electrical conductivity is 196 μ S/cm, and outward appearance is clear
Clear transparent, product quality indicator meets ISO 22241-I:The requirement of 2006 international standards, and carbonate and chloride detected level symbol
Close DB11/552-2008 Beijing standard；After Room-temperature seal is stored three months, outward appearance, smell are without the perceptible change of sense organ.
The product of the present embodiment is subjected to ETC, ESC on the diesel engine machine frame of 233 horsepowers of power (discharge capacity 6.5L)
Under working condition measurement, the specified discharge rate of product, after being handled through SCR aftertreatment system, NOx emission can reach state four standard.
Embodiment 9
(1) the high-purity urea of 9.2948g is added in the round-bottomed flask for having added 19.3036g high purity waters, sealed with grinding port plug
Afterwards, heating water bath is to 40 DEG C, and magnetic agitation to urea is completely dissolved, the transparent shape of solution；
(2) step (1) resulting solution is cooled to room temperature, adds 4.8283g acetamides, after being sealed with grinding port plug, magnetic force
Stirring to solution is mixed thoroughly.
(3) 8.2698g ethylene glycol, after being sealed with grinding port plug, magnetic agitation to solution will be added in step (2) resulting solution
It is mixed thoroughly.
(4) step (3) resulting solution is filtered with the cartridge pressure that filtering accuracy is 0.8pm, 0.6MPa, that is, obtains this hair
Bright ultralow temperature tail gas catalytic reducer product.
After measured, -30 DEG C of mixture solution freezing point, surface tension 64.6mN/m, electrical conductivity is 158 μ S/cm, and outward appearance is clear
Clear transparent, product quality indicator meets ISO 22241-I:The requirement of 2006 international standards, and carbonate and chloride detected level symbol
Close DB11/552-2008 Beijing standard；After Room-temperature seal is stored three months, outward appearance, smell are without the perceptible change of sense organ.
The product of the present embodiment is subjected to ETC, ESC on the diesel engine machine frame of 233 horsepowers of power (discharge capacity 6.5L)
Under working condition measurement, the specified discharge rate of product, after being handled through SCR aftertreatment system, NOx emission can reach state four standard.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (10)
1. a kind of ultralow temperature diesel vehicle urea liquid, it is characterised in that：Including following each component：Component A, component B, group
Divide C and component D；The component A is high purity water, and component B is urea, and component C is small molecule solid amide substance, and component D is
Small molecule alcohol material.
2. ultralow temperature diesel vehicle urea liquid according to claim 1, it is characterised in that：The parts by weight of each component
For：5~40 parts of 40~70 parts of component A, 20~35 parts of component B, 5~25 parts of component C and component D.
3. ultralow temperature diesel vehicle urea liquid according to claim 1, it is characterised in that：The parts by weight of each component
For：7~35 parts of 45~65 parts of component A, 23~32 parts of component B, 8~22 parts of component C and component D.
4. ultralow temperature diesel vehicle urea liquid according to claim 1, it is characterised in that：The parts by weight of each component
For：15~30 parts of 50~60 parts of component A, 26~30 parts of component B, 12~20 parts of component C and component D.
5. the ultralow temperature diesel vehicle urea liquid according to Claims 1-4 any one, it is characterised in that：It is described
Component C is more than one or both of acetamide, diacetayl amide and triacetamide；The content of the component C is 20 parts.
6. the ultralow temperature diesel vehicle urea liquid according to Claims 1-4 any one, it is characterised in that：It is described
Component D is more than one or both of methanol, ethanol and ethylene glycol.
7. a kind of method of the ultralow temperature diesel vehicle urea liquid prepared as described in claim 1 to 6 any one, it is special
Levy and be：Comprise the following steps：
(1) component B is added in component A, it is fully dissolved, obtain clear solution；
(2) component C and component D are sequentially added in the clear solution described in step (1), is sufficiently stirred for mixing, gained mixing is molten
Liquid produces ultralow temperature diesel vehicle urea liquid of the present invention.
8. the preparation method of the ultralow temperature diesel vehicle urea liquid described in claim 7, it is characterised in that：The step
(2) in, component C and component D are sequentially added in the clear solution described in step (1), is sufficiently stirred for mixing, gained mixed solution
Filtering, produces ultralow temperature diesel vehicle urea liquid of the present invention.
9. the preparation method of ultralow temperature diesel vehicle urea liquid according to claim 8, it is characterised in that：The step
Suddenly in (2), gained mixed solution produces ultralow temperature of the present invention after the cartridge pressure filtering through 0.5-0.8 μm, 0.6Mpa
Type diesel vehicle urea liquid.
10. the preparation method of ultralow temperature diesel vehicle urea liquid according to claim 7, it is characterised in that：It is described
In step (1), component B is added in component A, in making it fully dissolve at 35 DEG C~40 DEG C, clear solution is obtained；The step
(2) in, after the clear solution in step (1) is cooled to room temperature, component C is added, after component C is completely dissolved, is added
Component D.
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