CN105536865A - Diesel oil tail gas reducing agent for improving low temperature performances, and preparation method thereof - Google Patents
Diesel oil tail gas reducing agent for improving low temperature performances, and preparation method thereof Download PDFInfo
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- CN105536865A CN105536865A CN201510851243.0A CN201510851243A CN105536865A CN 105536865 A CN105536865 A CN 105536865A CN 201510851243 A CN201510851243 A CN 201510851243A CN 105536865 A CN105536865 A CN 105536865A
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- urea
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- reducing agent
- cryogenic property
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/0234—Nitrogen-, phosphorus-, arsenic- or antimony-containing compounds
- B01J31/0235—Nitrogen containing compounds
- B01J31/0245—Nitrogen containing compounds being derivatives of carboxylic or carbonic acids
-
- 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
-
- 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
- F01N2370/00—Selection of materials for exhaust purification
-
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a diesel oil tail gas reducing agent for improving low temperature performances, and a preparation method thereof. The problem of poor low temperature resitance of urea solutions for present traditional vehicles is solved in the invention, the atomization effect of the urea solution is effectively improved, and the NOx reducing efficiency is improved. The reducing agent comprises, by mass, 45-70% of highly pure water A, 20-35% of urea B, and 5-35% of micro-molecular liquid amide C. The product disclosed in the invention is suitable for being used at a low temperature, has a freezing point reaching -15 ~ -25 DEG C, has obviously lower surface tension than traditional common urea reducing agents, is suitable for being used in four seasons in south, and is suitable for being used in spring, summer, autumn and early winter in north.
Description
Technical field
The present invention relates to chemical technology field, be specifically related to a kind of diesel exhaust reducing agent improving cryogenic property and preparation method thereof.
Background technology
On May 15th, 2014, State Council issues " 2014-2015 energy-saving and emission-reduction low carbon development action scheme ", before pointing out the end of the year in 2014, at national supply country four standard derv fuel.2014 " 11 " period, comprise multiple provinces in Jiangsu, Fujian, Sichuan etc., all issued the respective oily popularization policy of state four.Ministry of Industry and Information announced from 1 day January in 2015, and the diesel vehicle of nationwide will enforce state IV discharge standard.Along with the promotion and implementation of derv fuel state IV discharge standard, domestic urea for vehicle market development has welcome new opportunity.Although this market is at the early-stage in recent years, domestic demand has a high potential, and urea for vehicle sales volume can increase rapidly.
The main pollutant effulent of Diesel engine is NOx (nitrogen oxide) and PM (particulate), and China is due to the impact of the factor such as national conditions, oil product, and what upgrading state four adopted is SCR route.Take the engine of SCR technology path in the process of burning, made diesel oil Thorough combustion by technological means thus reached the target of effectively controls PM discharge capacity, NOx then needs to be reduced to nitrogen (N in the process be vented
2) and water (H
2o), the reducing agent that this process is required is exactly urea for vehicle solution.Tail gas out enters blast pipe afterwards from turbocharger, and blast pipe is provided with urea measuring and injecting device, sprays into urea liquid when temperature reaches 300 DEG C ~ 500 DEG C, urea (NH under the effect of catalyst
2cONH
2) hydrolysis generation NH
3and CO
2, NH
3react with NOx, generate nitrogen and water discharge, the flue gas particle that simultaneously stability is harmful.
Purity and the purity requirements of urea for vehicle solution are higher, and relative to industrial urea, the content of biuret, insoluble matter, iron, sulfide, chloride etc. has strict requirement.Due to SCR catalyst carrier, that metal ion very easily occurs is poisoning thus lose catalytic effect, and therefore urea for vehicle solution must use electron trade one-level ultra-pure water.Current urea for vehicle solution is generally made up of the ultra-pure water of 32.5% high-purity urea and 67.5%.The urea liquid crystalline temperature of this concentration is minimum, can crystallization in lower than-11 DEG C, actual use in can freeze completely-20 DEG C time, its use under the cold snap in winter such as the north especially northeast is restricted.
The freezing point adding modifier reduction urea for vehicle solution is the way of most convenient and low cost, but because SCR catalyst is to the high request of urea for vehicle solution purity and cleanliness factor, the slaine that obviously can reduce aqueous solution freezing point can not use, and makes the range of choice of modifier very limited.Be ammonia source with urea, adding modifier, to improve the existing patent of freezing point many, but the ammonium class material mostly containing crystal or powdery type, as ammonium formate, ammonium carbonate, carbonic hydroammonium etc., easily cause dissolving uneven, affect the resistance to overturning of solution, and increase process costs.When the content of ammonium carbonate, carbonic hydroammonium is higher, CO
2detected level easily exceed standard, and poor stability, easily decomposes.In addition, the amide-type modifier that the present invention is used does not relate to the claim of existing patent.
Summary of the invention
The object of the invention is to adopt Novel modifier to reduce the freezing point of urea for vehicle solution, prepare a series of exhaust gas from diesel vehicle inorganic agent improving cryogenic property, different regions spring and summer can be adapted to and use season early winter in autumn.This amide-type modifier can be miscible with water, can be miscible with usual organic matter, and preparation method is simple, easy to operate, simple because forming, and do not introduce the composition of limited content, therefore every quality index is all qualified.
Improve a diesel exhaust reducing agent for cryogenic property, be made up of A, B, C tri-kinds of components: component A is high purity water, B component is urea, and component C is Small molecular liquid amide class material.Component A, component B and component C dissolve in certain proportion, Homogeneous phase mixing obtains clear solution.
In solution, component A mass fraction is 45% ~ 70%, and B component mass fraction is 20% ~ 35%, component C mass fraction is 5% ~ 35%.
In technical grade high purity water, add special urea, abundant stirring and dissolving, then adds amide substance, namely obtains the exhaust gas from diesel vehicle reductant solution improving cryogenic property after fully stirring and evenly mixing.
Component C is DMF, N-METHYLFORMAMIDE, one or more in DMA.
Improve an its preparation method for the diesel exhaust reducing agent of cryogenic property,
(1) high-purity urea is added add in the round-bottomed flask of high purity water, after grinding port plug sealing, be heated to 35 DEG C ~ 40 DEG C, be stirred to urea and dissolve completely, the transparent shape of solution;
(2) step (1) gained solution is cooled to room temperature, adds Small molecular liquid amide class material, after grinding port plug sealing, be stirred to solution and mix completely;
(3) by step (2) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain the tail gas catalytic reducer product improving cryogenic property of the present invention;
(4) preparation of pilot scale and commercial prod: the proportional amplification of all raw materials, strong stirring adds Small molecular liquid amide class material after urea dissolves completely, and the homogeneous solution obtained filters and obtain mixture solution of the present invention through the cartridge pressure of 0.5-0.8 μm.
The technical solution used in the present invention:
A kind of low form exhaust gas from diesel vehicle catalytic reducer, its composition and mass percent are: high purity water mass fraction is 45% ~ 70%, and high-purity urea quality mark is 20% ~ 35%, and amide-type mass fraction is 5 ~ 35%.
Described urea need meet the technical requirement of the special urea of AUS32 in GB29518-2013 " Diesel engine NOx reducing agent aqueous solution of urea (AUS32) " standard.
Described pure water need meet the technical requirement to pure water in GB29518-2013 " Diesel engine NOx reducing agent aqueous solution of urea (AUS32) " standard
Described amide-type is the product analyzing pure above grade.
Except formamide, major part has RCONH
2the acid amides of structure is colorless solid.Aliphatic substituted amide RCONHR ', RCONR '
2normal is liquid, wherein the most important thing is DMF (HCON (CH
3)
2).The acid amides of molecular weight can be water-soluble, and along with molecular weight increases, solubility reduces gradually.DMF (being called for short DMF), molecular formula is:
A kind of transparency liquid, can and water and majority of organic solvent dissolve each other, be high boiling polarity (hydrophily) non-protonic solvent, chemical and better heat stability.Compared with other small-molecular-weight liquid benzamide types, as formamide, N-METHYLFORMAMIDE (MMF), N, N-dimethylacetylamide (being called for short DMAC), except similar character, the most outstanding feature of DMF is that its freezing point is very low, for-61 DEG C, and former three freezing point is followed successively by 2.6 DEG C ,-40 DEG C ,-20 DEG C.Therefore first-selected DMF is low temperature modification agent in the present invention, the multiple combination in DMF, MMF and DMAC also can be selected according to cost, character, effect.Even if through the discharge duct of higher temperatures, part DMF decomposes generation dimethylamine, because dimethylamine is gas soluble in water, and its freezing point is-92 DEG C, the freezing point of solution can be reduced on the contrary further, do not affect the low temperature usability of reductant solution, and burning after product pollution-free.
Carbamide reducing agent sprays in the process in the exhaust pipe of engine being atomized, and atomizing effect is a very crucial problem.Atomizing effect is good, and the urea low particle size ejected is little, can be hydrolyzed fast, pyrolysis, enter catalyst carrier section, be diffused into catalyst surface, absorption, reaction, NH after reaction
3escape few, the efficiency of reducing NOx improves.The surface tension of atomizing effect and reductant solution has substantial connection.At room temperature, the surface tension of water is about 72mN/m, and traditional carbamide reducing agent is that the highly purified urea of employing and water are formulated, and its surface tension reaches more than 64mN/m, and the DMF of 100% is about 26mN/m.Can predict, after adding above-mentioned substance in conventional urea solution, the surface tension of solution inherently declines, and surface tension is less, and the reducing agent drop ejected is less, thus improves the atomizing effect of carbamide reducing agent.
ISO22241-1:2006 international standard and the detected level of DIN70070:2005 DIN to carbonate do not do requirement, and the present invention with reference to the carbonate that requires in DB11/552-2008 Beijing standard and SZJG33-2010 Shenzhen standard (with CO
2meter) detected level≤0.2%, thus there is very high value for applications.
Preparation method of the present invention comprises the following steps:
(1) high-purity urea is added add in the round-bottomed flask of high purity water, after grinding port plug sealing, be heated to 35 DEG C ~ 40 DEG C, be stirred to urea and dissolve completely, the transparent shape of solution;
(2) step (1) gained solution is cooled to room temperature, adds Small molecular liquid amide class material, after grinding port plug sealing, be stirred to solution and mix completely.
(3) by step (2) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain the tail gas catalytic reducer product improving cryogenic property of the present invention.
(4) preparation of pilot scale and commercial prod: the proportional amplification of all raw materials, strong stirring adds Small molecular liquid amide class material after urea dissolves completely, and the homogeneous solution obtained filters and obtain mixture solution of the present invention through the cartridge pressure of 0.5-0.8 μm.
Detailed description of the invention
Below by way of specific embodiment, the present invention will be further described.
Improve a diesel exhaust reducing agent for cryogenic property, be made up of A, B, C tri-kinds of components: component A is high purity water, B component is urea, and component C is Small molecular liquid amide class material.Component A, component B and component C dissolve in certain proportion, Homogeneous phase mixing obtains clear solution.
In solution, component A mass fraction is 45% ~ 70%, and B component mass fraction is 20% ~ 35%, component C mass fraction is 5% ~ 35%.
In technical grade high purity water, add special urea, abundant stirring and dissolving, then adds amide substance, namely obtains the exhaust gas from diesel vehicle reductant solution improving cryogenic property after fully stirring and evenly mixing.
Component C is DMF, N-METHYLFORMAMIDE, one or more in DMA.
Improve an its preparation method for the diesel exhaust reducing agent of cryogenic property,
(1) high-purity urea is added add in the round-bottomed flask of high purity water, after grinding port plug sealing, be heated to 35 DEG C ~ 40 DEG C, be stirred to urea and dissolve completely, the transparent shape of solution;
(2) step (1) gained solution is cooled to room temperature, adds Small molecular liquid amide class material, after grinding port plug sealing, be stirred to solution and mix completely;
(3) by step (2) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain the tail gas catalytic reducer product improving cryogenic property of the present invention;
(4) preparation of pilot scale and commercial prod: the proportional amplification of all raw materials, strong stirring adds Small molecular liquid amide class material after urea dissolves completely, and the homogeneous solution obtained filters and obtain mixture solution of the present invention through the cartridge pressure of 0.5-0.8 μm.
Embodiment 1
(1) high-purity for 7.2718g urea is added in the round-bottomed flask adding 15.6622g high purity water, after grinding port plug sealing, heating water bath to 40 DEG C, magnetic agitation is dissolved completely to urea, and solution is homogeneous transparent shape;
(2) step (1) gained solution is cooled to room temperature, adds 1.6735gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) be that the cartridge pressure of 0.8pm filters by step (2) gained solution filtering accuracy, namely obtain of the present inventionly improving cryogenic property exhaust gas from diesel vehicle catalytic reducer product.
(4) after measured ,-14.5 DEG C, mixture solution freezing point, surface tension 61mN/m, clear appearance is transparent, and impurity content all meets standard-required; After Room-temperature seal stores one month, outward appearance, smell are without the perceptible change of sense organ, and it is all qualified that performance indications detect.
Embodiment 2
(1) high-purity for 7.2350g urea is added in the round-bottomed flask adding 15.0031g high purity water, after grinding port plug sealing, heating water bath to 40 DEG C, magnetic agitation is dissolved completely to urea, the transparent shape of solution;
(2) step (1) gained solution is cooled to room temperature, adds 2.6267gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) be that the cartridge pressure of 0.8pm filters by step (2) gained solution filtering accuracy, namely obtain of the present inventionly improving cryogenic property exhaust gas from diesel vehicle catalytic reducer product.
(4) after measured ,-16 DEG C, mixture solution freezing point, surface tension 58.9mN/m, clear appearance is transparent, and impurity content all meets standard-required; After Room-temperature seal stores one month, outward appearance, smell are without the perceptible change of sense organ, and it is all qualified that performance indications detect.
Embodiment 3
(1) high-purity for 7.2257g urea is added in the round-bottomed flask adding 15.4654g high purity water, after grinding port plug sealing, heating water bath to 40 DEG C, magnetic agitation is dissolved completely to urea, the transparent shape of solution;
(2) step (1) gained solution is cooled to room temperature, adds 3.8223gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) be that the cartridge pressure of 0.8pm filters by step (2) gained solution filtering accuracy, namely obtain of the present inventionly improving cryogenic property exhaust gas from diesel vehicle catalytic reducer product.
(4) after measured ,-18 DEG C, mixture solution freezing point, surface tension 58mN/m, clear appearance is transparent, and impurity content all meets standard-required; After Room-temperature seal stores one month, outward appearance, smell are without the perceptible change of sense organ, and it is all qualified that performance indications detect.
Embodiment 4
(1) high-purity for 7.2067g urea is added in the round-bottomed flask adding 15.5379g high purity water, after grinding port plug sealing, heating water bath to 40 DEG C, magnetic agitation is dissolved completely to urea, the transparent shape of solution;
(2) step (1) gained solution is cooled to room temperature, adds 5.0306gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) be that the cartridge pressure of 0.8pm filters by step (2) gained solution filtering accuracy, namely obtain of the present inventionly improving cryogenic property exhaust gas from diesel vehicle catalytic reducer product.
(4) after measured ,-20 DEG C, mixture solution freezing point, surface tension 55.7mN/m, clear appearance is transparent, and impurity content all meets standard-required; After Room-temperature seal stores one month, outward appearance, smell are without the perceptible change of sense organ, and it is all qualified that performance indications detect.
Embodiment 5
(1) high-purity for 7.2886g urea is added in the round-bottomed flask adding 15.0395g high purity water, after grinding port plug sealing, heating water bath to 40 DEG C, magnetic agitation is dissolved completely to urea, the transparent shape of solution;
(2) step (1) gained solution is cooled to room temperature, adds 6.3602gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) by step (2) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(4) after measured ,-23 DEG C, mixture solution freezing point, surface tension 54.4mN/m, clear appearance is transparent, and impurity content all meets standard-required; After Room-temperature seal stores one month, outward appearance, smell are without the perceptible change of sense organ, and it is all qualified that performance indications detect.
Embodiment 6
(1) high-purity for 14.5459g urea is added in the round-bottomed flask adding 30.3884g high purity water, after grinding port plug sealing, heating water bath to 40 DEG C, magnetic agitation is dissolved completely to urea, the transparent shape of solution;
(2) step (1) gained solution is cooled to room temperature, adds 16.1716gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) by step (2) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(4) after measured ,-27 DEG C, mixture solution freezing point, surface tension 52.3mN/m, clear appearance is transparent, and impurity content all meets standard-required; After Room-temperature seal stores one month, outward appearance, smell are without the perceptible change of sense organ, and it is all qualified that performance indications detect.
Claims (6)
1. improve a diesel exhaust reducing agent for cryogenic property, it is characterized in that: be made up of A, B, C tri-kinds of components: component A is high purity water, B component is urea, component C is Small molecular liquid amide class material.
2. a kind of diesel exhaust reducing agent improving cryogenic property according to claim 1, is characterized in that: component A, component B and component C dissolve in certain proportion, Homogeneous phase mixing obtains clear solution.
3. a kind of diesel exhaust reducing agent improving cryogenic property according to claim 2, it is characterized in that: in solution, component A mass fraction is 45% ~ 70%, and B component mass fraction is 20% ~ 35%, component C mass fraction is 5% ~ 35%.
4. a kind of diesel exhaust reducing agent improving cryogenic property according to claim 1, it is characterized in that: in technical grade high purity water, add special urea, abundant stirring and dissolving, then add amide substance, after fully stirring and evenly mixing, namely obtain the exhaust gas from diesel vehicle reductant solution improving cryogenic property.
5. a kind of diesel exhaust reducing agent improving cryogenic property according to claim 1, is characterized in that: component C is DMF, N-METHYLFORMAMIDE, one or more in DMA.
6. improve an its preparation method for the diesel exhaust reducing agent of cryogenic property, it is characterized in that:
(1) high-purity urea is added add in the round-bottomed flask of high purity water, after grinding port plug sealing, be heated to 35 DEG C ~ 40 DEG C, be stirred to urea and dissolve completely, the transparent shape of solution;
(2) step (1) gained solution is cooled to room temperature, adds Small molecular liquid amide class material, after grinding port plug sealing, be stirred to solution and mix completely;
(3) by step (2) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain the tail gas catalytic reducer product improving cryogenic property of the present invention;
(4) preparation of pilot scale and commercial prod: the proportional amplification of all raw materials, strong stirring adds Small molecular liquid amide class material after urea dissolves completely, and the homogeneous solution obtained filters and obtain mixture solution of the present invention through the cartridge pressure of 0.5-0.8 μm.
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| CN201510851243.0A CN105536865A (en) | 2015-11-30 | 2015-11-30 | Diesel oil tail gas reducing agent for improving low temperature performances, and preparation method thereof |
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|---|---|---|---|
| CN201510851243.0A CN105536865A (en) | 2015-11-30 | 2015-11-30 | Diesel oil tail gas reducing agent for improving low temperature performances, and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106745060A (en) * | 2016-12-14 | 2017-05-31 | 河南省化工研究所有限责任公司 | A kind of low form urea for vehicle solution and preparation method thereof |
| CN107413213A (en) * | 2017-05-25 | 2017-12-01 | 亳州瑞达汽车用品科技有限公司 | A kind of urea for vehicle solution production system |
| 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 |
| 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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745060A (en) * | 2016-12-14 | 2017-05-31 | 河南省化工研究所有限责任公司 | A kind of low form urea for vehicle solution and preparation method thereof |
| CN107413213A (en) * | 2017-05-25 | 2017-12-01 | 亳州瑞达汽车用品科技有限公司 | A kind of urea for vehicle solution production system |
| 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 |
| 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: 20160504 |