CN107138044B - Diesel vehicle urea solution with low-temperature performance and preparation method thereof - Google Patents
Diesel vehicle urea solution with low-temperature performance and preparation method thereof Download PDFInfo
- Publication number
- CN107138044B CN107138044B CN201710409586.0A CN201710409586A CN107138044B CN 107138044 B CN107138044 B CN 107138044B CN 201710409586 A CN201710409586 A CN 201710409586A CN 107138044 B CN107138044 B CN 107138044B
- Authority
- CN
- China
- Prior art keywords
- component
- solution
- parts
- urea
- urea solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
-
- 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]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
Abstract
The invention provides a urea solution with low-temperature performance for a diesel vehicle and a preparation method thereof, wherein the urea solution with low-temperature performance for the diesel vehicle comprises the following components: component A, component B, component C and component D; the component A is high-purity water, the component B is urea, the component C is a micromolecular liquid alcohol amine substance, and the component D is a micromolecular liquid alcohol substance; the weight parts of the components are as follows: 40-70 parts of a component A, 20-35 parts of a component B, 5-25 parts of a component C and 5-40 parts of a component D. The urea solution with low temperature performance for diesel vehicles, provided by the invention, has the advantages that the freezing point of the obtained product is lower than-18 ℃ to-35 ℃, the surface tension is lower than that of the common vehicle urea, and the urea solution is suitable for all seasons in the south and north, especially cold seasons in the northeast.
Description
Technical Field
The invention belongs to the field of diesel engine tail gas treatment, and particularly relates to a urea solution with low-temperature performance for a diesel vehicle and a preparation method thereof.
Background
In recent years, every winter, most areas in the middle east have frequent haze, the number of haze days is more than 5 days in common, and the haze in the whole country tends to increase. Particularly, in recent two years, the duration of haze weather is longer, for example, in 2015, the air standard-reaching days of Beijing are only 186 days, in 2016, and in 11 months of Beijing, the air standard-reaching days are less than 5. Haze is a general expression for the exceeding of the content of hundreds of suspended particulate matters in the atmosphere, and especially PM2.5 (particulate matters with aerodynamic equivalent diameter less than or equal to 2.5 microns) is considered as the 'souring' for causing haze weather. Research shows that the automobile exhaust emission accounts for about 30% of the total amount of PM2.5 pollutants in China, and is one of the 'accidents' causing haze weather in China, wherein the exhaust pollution from heavy diesel vehicles is up to more than two thirds. The data show that the nitrogen oxide and PM pollutants discharged by diesel vehicles only account for 17% of the automobile holding amount in China, and respectively account for more than 60% and 90% of the total discharge amount of motor vehicles. In order to reduce the pollution of automobile exhaust to the atmospheric environment, China has comprehensively pursued the four emission standards of China.
5 and 15 days in 2014, the State administration releases an action scheme for energy conservation, emission reduction and low carbon development in 2014 and 2015, and indicates that four standard automotive diesel is supplied to China before the end of 2014. In the eleventh period in 2014, various national four-oil popularization policies are issued in a plurality of provinces including Jiangsu, Fujian, Sichuan and the like. Industry and belief states that nationwide diesel vehicles will enforce national IV emission standards from 1 month 1 day 2015. With the popularization and implementation of national IV emission standards of diesel oil for vehicles, the development of the domestic urea for vehicles meets a new opportunity. Although the market has just started in recent years, the demand potential in China is huge, and the sales of urea for vehicles can be rapidly increased.
The main pollution emissions of the diesel engine are NOx (nitrogen oxide) and PM (particulate matter), and the SCR route is adopted in the fourth country of the upgrade due to the influence of factors such as national conditions, oil products and the like. Engines using the SCR technology route have been technically designed to burn diesel fuel sufficiently to achieve the goal of effective control of PM emissions during combustion, while NOx needs to be reduced to nitrogen (N) during exhaust2) And water (H)2O), the reducing agent necessary for this process is the vehicle urea solution. The tail gas is discharged from the turbocharger and enters an exhaust pipe, a urea metering injection device is arranged on the exhaust pipe, urea solution is injected when the temperature reaches 300-500 ℃, and urea (NH) is generated under the action of a catalyst2CONH2) Hydrolysis to NH3And CO2，NH3Reacts with NOx to generate nitrogen and water to be discharged, and simultaneously absorbs harmful smoke particles.
The urea solution for vehicles has high requirements on purity and cleanliness, and has strict requirements on the content of biuret, insoluble substances, iron, sulfide, chloride and the like compared with industrial urea. Since the SCR catalyst carrier is easy to be poisoned by metal ions so as to lose the catalytic effect, the automobile urea solution must use first-grade ultrapure water in the electronic industry. The current automobile urea solution generally consists of 32.5 percent of high-purity urea and 67.5 percent of ultrapure water. The urea solution with the concentration has the lowest crystallization point, can crystallize at the temperature of lower than-11 ℃, can be completely frozen at the temperature of-20 ℃ in actual use, and has limited use in cold weather in winter such as the north, particularly the northeast and the like. The modifier is added to reduce the freezing point of the automobile urea solution, which is the most convenient and low-cost method, but because of the high requirements of the SCR catalyst on the purity and cleanliness of the automobile urea solution, the metal salt which can obviously reduce the freezing point of the aqueous solution cannot be used, so that the selection range of the modifier is very limited, the inorganic salt can only select ammonium substances basically, and the organic modifier mostly selects amines or amides.
The search shows that the prior patents of using urea as an ammonia source and adding a modifier to improve the freezing point are more, but most of the prior patents are ammonium substances, such as ammonium formate, ammonium carbonate, ammonium bicarbonate and the like, and when the content is higher, CO is higher2The detected amount of (A) is easy to exceed the standard, and the stability is poor, and the decomposition is easy. Triethanolamine is used in the automobile exhaust emission purification treatment liquid 201410193227, but the composition of the treatment liquid is very complex, the process cost and difficulty are greatly increased, and the detected amount of phosphate (less than or equal to 0.5) also exceeds the standard according to the universal standard of automobile urea. Complex components are highly likely to poison sensitive catalysts and thereby affect their reactivity.
Many patents such as chinese patent CN201110134706.3 "a low temperature urea solution composition for vehicles", CN201110134698.2 "a urea solution composition for ultra-low temperature vehicles", CN201510015958 "a low freezing point nitrogen oxide reducing agent and its preparation method", and CN 201510017530 "an ultra-low freezing point nitrogen oxide reducing agent and its preparation method" all select small molecular liquid alcohols as the composite additive, but the components are complex relative to the patent, and the process difficulty is increased. In addition, formamide is contained, has flammability, can decompose highly toxic hydrogen cyanide when heated to below 35 ℃ in the presence of a catalyst, can strongly corrode copper, brass, lead and rubber, and is inconvenient to store and transport. CN201510015958 and CN 201510017530 also include sulfur-containing organic compounds, dimethyl sulfoxide, which may generate sulfur contaminants after pyrolysis. The modifier has simple components, and no content-limiting component is introduced, so all quality indexes are qualified.
In conclusion, the micromolecular liquid alcohol amine modifier used in the invention does not relate to the claims of the prior patent, and has simple formula and obvious effect.
Disclosure of Invention
In view of the above, the invention aims to provide a urea solution for diesel vehicles with low temperature performance, so as to overcome the defects of the prior art, the liquid alcohol amine and the liquid alcohol modifier can be mixed and dissolved with water and common organic matters, the composition and the preparation method are simple, the operation is convenient, the content-limited components are not introduced, all quality indexes are qualified, and the urea solution can be suitable for being used in spring, summer, autumn, early winter and cold seasons in different areas.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a urea solution with low-temperature performance for a diesel vehicle comprises the following components: component A, component B, component C and component D; the component A is high-purity water, the component B is urea, the component C is a micromolecular liquid alcohol amine substance, and the component D is a micromolecular liquid alcohol substance.
Preferably, the weight parts of the components are as follows: 40-70 parts of a component A, 20-35 parts of a component B, 5-25 parts of a component C and 5-40 parts of a component D.
Preferably, the weight parts of the components are as follows: 45-65 parts of a component A, 23-30 parts of a component B, 8-22 parts of a component C and 9-35 parts of a component D.
Preferably, the weight parts of the components are as follows: 50-60 parts of a component A, 25-28 parts of a component B, 13-20 parts of a component C and 15-28 parts of a component D.
Preferably, the component C is ethanolamine and/or diethanolamine; the content of the component C is 20 parts.
Preferably, the component D is one or more than two of methanol, ethanol and glycol.
The high-purity water is industrial high-purity water.
The urea needs to meet the technical requirements of special urea for AUS32 in GB29518-2013 aqueous urea solution (AUS32) as a nitrogen oxide reducing agent for diesel engines.
The pure water needs to meet the technical requirements on the pure water in GB29518-2013 aqueous urea solution (AUS32) as nitrogen oxide reducing agent of diesel engine
The micromolecular liquid alcohol amine substance and the micromolecular liquid alcohol substance are both products with more than analytical purity.
Ethanolamine is also named 2-hydroxyethylamine and has the molecular formula of HO (CH)2)2NH2The product is colorless transparent liquid, and is miscible with water, methanol, ethanol, acetone, etc. and has good stability. Experiments show that after a certain amount of ethanolamine is added into the common automobile urea, the freezing point of the solution is obviously reduced. In order to reduce the cost, the content of ethanolamine is not too high, preferably 20%, and some liquid alcohols with low molecular weight can be added at the same time. Furthermore, diethanolamine may also be miscible with water, ethanol, etc., and one or more thereof may be considered to be added.
Small molecule liquid alcohols have very low freezing point and low density, such as methanol (-97 deg.C, 0.792 g/cm)3) Ethanol (-114 ℃, 0.798 g/cm)3) The urea solution can be made to have a lower freezing point and viscosity. However, since they have high volatility and high volatile flammability, they should not be added in an excessive amount. After the alcohol amine is compounded with liquid alcohol amine, the volatility of methanol and ethanol is obviously weakened, and the freezing point of the solution is not obviously reduced after the solution is placed for three months. Although ethylene glycol is commonly used for preparing the automobile antifreeze, the ethylene glycol has a slightly high density, so that the viscosity of the urea solution is increased, the fluidity is reduced, and excessive addition is not suitable. In the present invention, methanol is preferable in view of cost, availability, safety and viscosity, and various combinations of methanol, ethanol and ethylene glycol may be selected depending on the properties and effects.
The atomization effect of the vehicle urea solution is a critical problem in the process of atomizing and injecting the vehicle urea solution into an exhaust pipe of an engine. The atomization effect is good, the size of the sprayed urea small particles is small, the urea can be quickly hydrolyzed, pyrolyzed, enter the catalyst carrier section, diffuse to the surface of the catalyst, adsorb and react, and NH is generated after the reaction3Less slip and high NOx reducing efficiency. The atomization effect is close to the surface tension of the reducing agent solutionAnd (4) relationship. The surface tension of water is 72mN/m at room temperature, the surface tension of the traditional automobile urea solution is prepared by adopting high-purity urea and water, the surface tension reaches more than 66mN/m, 100% methanol or ethanol is below 25mN/m, and the ethylene glycol is 50 mN/m. The surface tension of the solution is predicted to be reduced after the substances are added into the traditional urea solution, and the sprayed reducing agent liquid drop is smaller, so that the atomization effect of the vehicle urea solution is improved.
The conductivity also has certain influence in the using process of the urea solution, the lower the conductivity is, the slower the solution charge flows in the reaction system, the charge accumulation is easy to cause, the flowing potential is formed, the electric spark is easy to generate when the flowing potential is high to a certain degree, and the potential danger is caused to vehicles. Since the organic alcohol amine is basically not ionized and has small conductivity, the conductivity of the organic alcohol amine is reduced by adding the organic alcohol amine into the urea solution. However, even if the adding amount is 20%, compared with the conductivity of the primary industrial electronic water which is less than 1 muS/cm, the conductivity of the urea solution is still more than 300 muS/cm, and the conductivity is higher.
Another object of the present invention is to provide a method for preparing the urea solution for diesel vehicles with low temperature performance as described above, so as to prepare the urea solution for diesel vehicles with low temperature performance.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a process for preparing a urea solution for diesel vehicles having low temperature properties as described above, comprising the steps of:
(1) adding the component B into the component A, and fully dissolving the component B to obtain a transparent solution;
(2) and (2) sequentially adding the component C and the component D into the transparent solution in the step (1), fully stirring and uniformly mixing, and obtaining a mixed solution to obtain the urea solution with low temperature performance for the diesel vehicle.
Preferably, in the step (2), the component C and the component D are sequentially added into the transparent solution in the step (1), the mixture is fully stirred and uniformly mixed, and the obtained mixed solution is filtered to obtain the urea solution with low temperature performance for the diesel vehicle.
Preferably, in the step (2), the urea solution for diesel vehicles with low temperature performance is obtained after the obtained mixed solution is filtered by a filter element with the pressure of 0.5-0.8 μm and 0.6 Mpa.
Preferably, in the step (1), the component B is added into the component A, and is fully dissolved at the temperature of 35-40 ℃ to obtain a transparent solution; in the step (2), after the transparent solution in the step (1) is cooled to room temperature, the component C is added, and after the component C is completely dissolved, the component D is added.
The preparation method is applied to laboratory product lab scale preparation, and the preparation process comprises the following steps:
(1) adding high-purity urea into a round-bottom flask added with high-purity water, sealing the round-bottom flask by using a ground plug, heating to 35-40 ℃, and stirring until the urea is completely dissolved, wherein the solution is transparent;
(2) and (2) cooling the solution obtained in the step (1) to room temperature, adding a small molecular liquid alcohol amine substance, sealing by using a ground plug, and stirring until the solution is completely and uniformly mixed.
(3) And (3) adding micromolecular liquid alcohol into the solution obtained in the step (2), sealing by using a ground plug, and stirring until the solution is completely and uniformly mixed.
(4) And (4) filtering the solution obtained in the step (3) by using a filter element with the filtering precision of 0.8pm and 0.6Mpa, thus obtaining the urea solution for the diesel vehicle with low temperature performance.
The preparation method provided by the invention is applied to the preparation of pilot plant test and commercial products, and comprises the following steps: all the raw materials are amplified in proportion, the mixture is stirred strongly until the urea is completely dissolved, then the solid amide substances and the micromolecular liquid alcohol substances are added in sequence, the mixture is stirred strongly until the mixture is completely and uniformly mixed, and the obtained solution is filtered by a filter element pressure of 0.5-0.8 mu m and 0.6Mpa to obtain the urea solution with low temperature performance for the diesel vehicle.
Compared with the prior art, the urea solution with low temperature performance for the diesel vehicle has the following advantages:
the urea solution for the diesel vehicle with low temperature performance, disclosed by the invention, has the advantages that the liquid alcohol amine and the liquid alcohol modifier can be mixed and dissolved with water and can be mixed and dissolved with common organic matters, the composition and the preparation method are simple, the operation is convenient, the content-limited components are not introduced, all quality indexes are qualified (meeting the requirements of ISO 22241-1:2006 international standard, DIN 70070:2005 Germany standard and DB11/552 Beijing standard), the freezing point of the product is lower than-18 ℃ to-35 ℃, the surface tension is lower than that of the urea solution for the common vehicle, the atomization effect is good, the conductivity is higher, the NOx reduction efficiency can be improved, and the urea solution is suitable for being used in various seasons in the south and the north, especially in cold seasons in the northeast.
According to the urea solution for the diesel vehicle with low temperature performance, the detected amounts of carbonate and chloride both reach the requirements in DB11/552-2008 Beijing standard (because the ISO 22241-1:2006 international standard and DIN 70070:2005 Germany standard do not require the detected amounts of carbonate and chloride, the DB11/552-2008 Beijing standard is referred to), and the detected amounts of the carbonate and the chloride respectively are as follows: carbonate (with CO)2Measured) detected amount is less than or equal to 0.2 percent, and detected amount of chloride is less than or equal to 0.2 percent.
The method for preparing the urea solution for the diesel vehicle with the low-temperature performance has the same advantages as the urea solution for the diesel vehicle with the low-temperature performance compared with the prior art, and the detailed description is omitted.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
Example 1
(1) 4.9376g of high-purity urea is added into a round-bottom flask added with 10.2411g of high-purity water, a ground plug is used for sealing, the round-bottom flask is heated in a water bath to 40 ℃, the round-bottom flask is magnetically stirred until the urea is completely dissolved, and the solution is transparent;
(2) and (2) cooling the solution obtained in the step (1) to room temperature, adding 2.5629g of ethanolamine, sealing by using a ground plug, and magnetically stirring until the solution is completely and uniformly mixed.
(3) 1.1335g of methanol is added into the solution obtained in the step (2), and after a ground plug is used for sealing, the solution is stirred by magnetic force until the solution is completely and uniformly mixed.
(4) And (4) filtering the solution obtained in the step (3) by using a filter element with the filtering precision of 0.8pm and 0.6MPa, thus obtaining the urea solution for the diesel vehicle with low temperature performance.
The determination shows that the freezing point of the mixture solution is-18 ℃, the surface tension is 70.3mN/m, the conductivity is 555 muS/cm, the appearance is clear and transparent, the product quality index meets the international standard requirement of ISO 22241-I:2006, and the detected amount of carbonate and chloride meets the DB11/552 Beijing 2008 standard; after sealed storage for three months at room temperature, there was no sensory perceptible change in appearance, odor.
The product of the embodiment is subjected to ETC and ESC working condition tests on a diesel engine rack with 233 horsepower (6.5L of discharge capacity), and the NOx emission can reach the national four standards after being treated by an SCR aftertreatment system under the rated spray quantity of the product.
Example 2
(1) 5.0335g of high-purity urea is added into a round-bottom flask added with 10.4505g of high-purity water, a ground plug is used for sealing, the round-bottom flask is heated in a water bath to 40 ℃, the round-bottom flask is magnetically stirred until the urea is completely dissolved, and the solution is transparent;
(2) and (2) cooling the solution obtained in the step (1) to room temperature, adding 2.626g of ethanolamine, sealing by using a ground plug, and magnetically stirring until the solution is completely and uniformly mixed.
(3) 2.6200g of methanol is added into the solution obtained in the step (2), and after a ground plug is used for sealing, the solution is stirred by magnetic force until the solution is completely and uniformly mixed.
(4) And (4) filtering the solution obtained in the step (3) by using a filter element with the filtering precision of 0.8pm under pressure to obtain the urea solution for the diesel vehicle with low temperature performance.
The determination shows that the freezing point of the mixture solution is-24 ℃, the surface tension is 65.5mN/m, the conductivity is 449 muS/cm, the appearance is clear and transparent, the product quality index meets the international standard requirement of ISO 22241-I:2006, and the detected amount of carbonate and chloride meets the Beijing standard of DB 11/552-; after sealed storage for three months at room temperature, there was no sensory perceptible change in appearance, odor.
The product of the embodiment is subjected to ETC and ESC working condition tests on a diesel engine rack with 233 horsepower (6.5L of discharge capacity), and the NOx emission can reach the national four standards after being treated by an SCR aftertreatment system under the rated spray quantity of the product.
Example 3
(1) 5.0342g of high-purity urea is added into a round-bottom flask added with 10.4476g of high-purity water, a ground plug is used for sealing, the round-bottom flask is heated in a water bath to 40 ℃, the round-bottom flask is magnetically stirred until the urea is completely dissolved, and the solution is transparent;
(2) and (2) cooling the solution obtained in the step (1) to room temperature, adding 2.6135g of ethanolamine, sealing by using a ground plug, and magnetically stirring until the solution is completely and uniformly mixed.
(3) 4.4703g of methanol is added into the solution obtained in the step (2), and after a ground plug is used for sealing, the solution is stirred by magnetic force until the solution is completely and uniformly mixed.
(4) And (4) filtering the solution obtained in the step (3) by using a filter element with the filtering precision of 0.8pm and 0.6MPa, thus obtaining the urea solution for the diesel vehicle with low temperature performance.
The determination shows that the freezing point of the mixture solution is-28 ℃, the surface tension is 60.3mN/m, the conductivity is 380 muS/cm, the appearance is clear and transparent, the product quality index meets the international standard requirement of ISO 22241-I:2006, and the detected amount of carbonate and chloride meets the DB11/552 Beijing 2008 standard; after sealed storage for three months at room temperature, there was no sensory perceptible change in appearance, odor.
The product of the embodiment is subjected to ETC and ESC working condition tests on a diesel engine rack with 233 horsepower (6.5L of discharge capacity), and the NOx emission can reach the national four standards after being treated by an SCR aftertreatment system under the rated spray quantity of the product.
Example 4
(1) 4.9765g of high-purity urea is added into a round-bottom flask added with 10.3377g of high-purity water, a ground plug is used for sealing, the round-bottom flask is heated in a water bath to 40 ℃, the round-bottom flask is magnetically stirred until the urea is completely dissolved, and the solution is transparent;
(2) and (2) cooling the solution obtained in the step (1) to room temperature, adding 2.5896g of ethanolamine, sealing by using a ground plug, and magnetically stirring until the solution is completely and uniformly mixed.
(3) 6.898g of methanol is added into the solution obtained in the step (2), and after a ground plug is used for sealing, the solution is stirred by magnetic force until the solution is completely and uniformly mixed.
(4) And (4) filtering the solution obtained in the step (3) by using a filter element with the filtering precision of 0.8pm and 0.6MPa, thus obtaining the urea solution for the diesel vehicle with low temperature performance.
The determination shows that the freezing point of the mixture solution is-32 ℃, the surface tension is 57.3mN/m, the conductivity is 299 MuS/cm, the appearance is clear and transparent, the product quality index meets the international standard requirement of ISO 22241-I:2006, and the detected amount of carbonate and chloride meets the DB11/552-2008 Beijing standard; after sealed storage for three months at room temperature, there was no sensory perceptible change in appearance, odor.
The product of the embodiment is subjected to ETC and ESC working condition tests on a diesel engine stand with 233 horsepower (6.5L of displacement), and the NOx emission can reach the national four standards after being treated by an SCR aftertreatment system under the rated spraying amount of the product.
Example 5
(1) 10.3200g of high-purity urea is added into a round-bottom flask added with 21.4329g of high-purity water, a ground plug is used for sealing, the round-bottom flask is heated in a water bath to 40 ℃, the round-bottom flask is magnetically stirred until the urea is completely dissolved, and the solution is transparent;
(2) and (2) cooling the solution obtained in the step (1) to room temperature, adding 5.3551g of ethanolamine, sealing by using a ground plug, and magnetically stirring until the solution is completely and uniformly mixed.
(3) 5.3610g of ethanol is added into the solution obtained in the step (2), and after a ground plug is used for sealing, the solution is stirred by magnetic force until the solution is completely and uniformly mixed.
(4) And (4) filtering the solution obtained in the step (3) by using a filter element with the filtering precision of 0.8pm and 0.6MPa, thus obtaining the urea solution for the diesel vehicle with low temperature performance.
The determination shows that the freezing point of the mixture solution is-26 ℃, the surface tension is 54.0mN/m, the conductivity is 316 mu S/cm, the appearance is clear and transparent, the product quality index meets the international standard requirement of ISO 22241-I:2006, and the detection amount of carbonate and chloride meets the DB11/552 Beijing 2008 standard; after sealed storage for three months at room temperature, there was no sensory perceptible change in appearance, odor.
The product of the embodiment is subjected to ETC and ESC working condition tests on a diesel engine rack with 233 horsepower (6.5L of discharge capacity), and the NOx emission can reach the national four standards after being treated by an SCR aftertreatment system under the rated spray quantity of the product.
Example 6
(1) 9.2948g of high-purity urea is added into a round-bottom flask added with 19.3036g of high-purity water, a ground plug is used for sealing, the round-bottom flask is heated in a water bath to 40 ℃, the round-bottom flask is magnetically stirred until the urea is completely dissolved, and the solution is transparent;
(2) and (2) cooling the solution obtained in the step (1) to room temperature, adding 4.8283g of ethanolamine, sealing by using a ground plug, and magnetically stirring until the solution is completely and uniformly mixed.
(3) 8.2698g of ethylene glycol is added into the solution obtained in the step (2), and after a grinding plug is used for sealing, the solution is stirred by magnetic force until the solution is completely and uniformly mixed.
(4) And (4) filtering the solution obtained in the step (3) by using a filter element with the filtering precision of 0.8pm and 0.6MPa, thus obtaining the urea solution for the diesel vehicle with low temperature performance.
The determination shows that the freezing point of the mixture solution is-32 ℃, the surface tension is 63.8mN/m, the conductivity is 470.5 muS/cm, the appearance is clear and transparent, the product quality index meets the international standard requirement of ISO 22241-I:2006, and the detected amount of carbonate and chloride meets the Beijing standard of DB 11/552-; after sealed storage for three months at room temperature, there was no sensory perceptible change in appearance, odor.
The product of the embodiment is subjected to ETC and ESC working condition tests on a diesel engine rack with 233 horsepower (6.5L of discharge capacity), and the NOx emission can reach the national four standards after being treated by an SCR aftertreatment system under the rated spray quantity of the product.
Example 7
(1) 11.0341g of high-purity urea is added into a round-bottom flask added with 22.9221g of high-purity water, a ground plug is used for sealing, the round-bottom flask is heated in a water bath to 40 ℃, the round-bottom flask is magnetically stirred until the urea is completely dissolved, and the solution is transparent;
(2) and (2) cooling the solution obtained in the step (1) to room temperature, adding 5.6311g of diethanolamine, sealing by a ground plug, and magnetically stirring until the solution is completely and uniformly mixed.
(3) 9.8861g of methanol is added into the solution obtained in the step (2), and after a ground plug is used for sealing, the solution is stirred by magnetic force until the solution is completely and uniformly mixed.
(4) And (4) filtering the solution obtained in the step (3) by using a filter element with the filtering precision of 0.8pm and 0.6MPa, thus obtaining the urea solution for the diesel vehicle with low temperature performance.
The determination shows that the freezing point of the mixture solution is-35 ℃, the surface tension is 55.9mN/m, the conductivity is 183 MuS/cm, the appearance is clear and transparent, the product quality index meets the international standard requirement of ISO 22241-I:2006, and the detected amount of carbonate and chloride meets the DB11/552-2008 Beijing standard; after sealed storage for three months at room temperature, there was no sensory perceptible change in appearance, odor.
The product of the embodiment is subjected to ETC and ESC working condition tests on a diesel engine rack with 233 horsepower (6.5L of discharge capacity), and the NOx emission can reach the national four standards after being treated by an SCR aftertreatment system under the rated spray quantity of the product.
Example 8
(1) 9.9590g of high-purity urea is added into a round-bottom flask added with 20.6847g of high-purity water, a ground plug is used for sealing, the round-bottom flask is heated in a water bath to 40 ℃, the round-bottom flask is magnetically stirred until the urea is completely dissolved, and the solution is transparent;
(2) and (2) cooling the solution obtained in the step (1) to room temperature, adding 5.1768g of diethanolamine, sealing by a ground plug, and magnetically stirring until the solution is completely and uniformly mixed.
(3) 5.1719g of ethanol is added into the solution obtained in the step (2), and after a ground plug is used for sealing, the solution is stirred by magnetic force until the solution is completely and uniformly mixed.
(4) And (4) filtering the solution obtained in the step (3) by using a filter element with the filtering precision of 0.8pm and 0.6MPa, thus obtaining the urea solution for the diesel vehicle with low temperature performance.
The determination shows that the freezing point of the mixture solution is-27 ℃, the surface tension is 52.7mN/m, the conductivity is 212 MuS/cm, the appearance is clear and transparent, the product quality index meets the international standard requirement of ISO 22241-I:2006, and the detected amount of carbonate and chloride meets the DB11/552 Beijing 2008 standard; after sealed storage for three months at room temperature, there was no sensory perceptible change in appearance, odor.
The product of the embodiment is subjected to ETC and ESC working condition tests on a diesel engine rack with 233 horsepower (6.5L of discharge capacity), and the NOx emission can reach the national four standards after being treated by an SCR aftertreatment system under the rated spray quantity of the product.
Example 9
(1) 11.6944g of high-purity urea is added into a round-bottom flask added with 24.2808g of high-purity water, a ground plug is used for sealing, the round-bottom flask is heated in a water bath to 40 ℃, the round-bottom flask is magnetically stirred until the urea is completely dissolved, and the solution is transparent;
(2) and (2) cooling the solution obtained in the step (1) to room temperature, adding 6.0732g of diethanolamine, sealing by a ground plug, and magnetically stirring until the solution is completely and uniformly mixed.
(3) 10.4111g of ethylene glycol is added into the solution obtained in the step (2), and after a grinding plug is used for sealing, the solution is stirred by magnetic force until the solution is completely and uniformly mixed.
(4) And (4) filtering the solution obtained in the step (3) by using a filter element with the filtering precision of 0.8pm and 0.6MPa, thus obtaining the urea solution for the diesel vehicle with low temperature performance.
The determination shows that the freezing point of the mixture solution is-31 ℃, the surface tension is 62.3mN/m, the conductivity is 210 muS/cm, the appearance is clear and transparent, the product quality index meets the international standard requirement of ISO 22241-I:2006, and the detected amount of carbonate and chloride meets the DB11/552 Beijing 2008 standard; after sealed storage for three months at room temperature, there was no sensory perceptible change in appearance, odor.
The product of the embodiment is subjected to ETC and ESC working condition tests on a diesel engine rack with 233 horsepower (6.5L of discharge capacity), and the NOx emission can reach the national four standards after being treated by an SCR aftertreatment system under the rated spray quantity of the product.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A urea solution with low temperature performance for diesel vehicles is characterized in that: consists of a component A, a component B, a component C and a component D; the component A is high-purity water, the component B is urea, the component C is ethanolamine and/or diethanolamine, and the component D is a micromolecular liquid alcohol substance;
the weight parts of the components are as follows: 40-70 parts of a component A, 20-35 parts of a component B, 5-25 parts of a component C and 5-40 parts of a component D.
2. The urea solution for diesel vehicles having low temperature properties according to claim 1, characterized in that: the weight parts of the components are as follows: 45-65 parts of a component A, 23-30 parts of a component B, 8-22 parts of a component C and 9-35 parts of a component D.
3. The urea solution for diesel vehicles having low temperature properties according to claim 1, characterized in that: the weight parts of the components are as follows: 50-60 parts of a component A, 25-28 parts of a component B, 13-20 parts of a component C and 15-28 parts of a component D.
4. Urea solution according to any of the claims 1-3 for diesel vehicles having low temperature properties, characterized in that: the content of the component C is 20 parts.
5. Urea solution according to any of the claims 1-3 for diesel vehicles having low temperature properties, characterized in that: the component D is one or more than two of methanol, ethanol and glycol.
6. A process for the preparation of a urea solution for diesel vehicles having low temperature properties according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
(1) adding the component B into the component A, and fully dissolving the component B to obtain a transparent solution;
(2) and (2) sequentially adding the component C and the component D into the transparent solution in the step (1), fully stirring and uniformly mixing, and obtaining a mixed solution to obtain the urea solution with low temperature performance for the diesel vehicle.
7. The process for preparing a urea solution for diesel vehicles having low temperature properties according to claim 6, characterized in that: and (2) sequentially adding the component C and the component D into the transparent solution obtained in the step (1), fully stirring and uniformly mixing, and filtering the obtained mixed solution to obtain the urea solution with low temperature performance for the diesel vehicle.
8. The method for preparing urea solution for diesel vehicles with low temperature performance as claimed in claim 7, wherein: and (3) filtering the mixed solution in the step (2) by using a filter element with the pressure of 0.5-0.8 mu m and 0.6Mpa to obtain the urea solution with low temperature performance for the diesel vehicle.
9. The method for preparing urea solution for diesel vehicles with low temperature performance as claimed in claim 6, wherein: in the step (1), the component B is added into the component A and fully dissolved at the temperature of 35-40 ℃ to obtain a transparent solution; in the step (2), after the transparent solution in the step (1) is cooled to room temperature, the component C is added, and after the component C is completely dissolved, the component D is added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710409586.0A CN107138044B (en) | 2017-06-02 | 2017-06-02 | Diesel vehicle urea solution with low-temperature performance and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710409586.0A CN107138044B (en) | 2017-06-02 | 2017-06-02 | Diesel vehicle urea solution with low-temperature performance and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107138044A CN107138044A (en) | 2017-09-08 |
| CN107138044B true CN107138044B (en) | 2020-06-23 |
Family
ID=59780474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710409586.0A Active CN107138044B (en) | 2017-06-02 | 2017-06-02 | Diesel vehicle urea solution with low-temperature performance and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107138044B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109621722A (en) * | 2018-12-27 | 2019-04-16 | 兰州梓苑环保科技有限公司 | A kind of low temperature resistant exhaust gas from diesel vehicle treatment fluid |
| CN111389208B (en) * | 2020-03-25 | 2022-06-03 | 山东骏逸环境科技有限公司 | Amino denitration agent and preparation method thereof |
| CN111533670A (en) * | 2020-04-30 | 2020-08-14 | 辽宁三特石油化工有限公司 | Urea aqueous solution |
| CN111686582A (en) * | 2020-05-11 | 2020-09-22 | 江苏龙蟠科技股份有限公司 | Anti-scaling urea solution for vehicles and preparation method thereof |
| CN112554999B (en) * | 2020-12-23 | 2023-05-05 | 重庆化工职业学院 | Anti-crystallization type vehicle urea aqueous solution and preparation method thereof |
| 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 (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1377722A (en) * | 2001-12-30 | 2002-11-06 | 国家环境保护总局华南环境科学研究所 | Wet urea additive process for simultanously desulfurizing and denitrification |
| CN102213124A (en) * | 2011-05-24 | 2011-10-12 | 辽宁润迪精细化工有限公司 | Ultralow-temperature urea reducing agent composition |
| CN102213126A (en) * | 2011-05-24 | 2011-10-12 | 辽宁润迪精细化工有限公司 | Low-temperature urea reducing agent composition |
| CN104265422A (en) * | 2014-08-03 | 2015-01-07 | 长春市永畅实业有限责任公司 | Low-temperature condition release ammonia reducing agent composition and preparation method thereof |
| CN104533577A (en) * | 2015-01-13 | 2015-04-22 | 四川美丰化工股份有限公司 | Nitric oxide reducing agent with ultra-low freezing point and manufacturing method thereof |
| CN104607041A (en) * | 2014-11-28 | 2015-05-13 | 河南弘康环保科技有限公司 | Ultra-low temperature urea solution used for vehicle |
| CN104649621A (en) * | 2013-11-25 | 2015-05-27 | 刘汉斌 | Anti-freezing concrete 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 |
-
2017
- 2017-06-02 CN CN201710409586.0A patent/CN107138044B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1377722A (en) * | 2001-12-30 | 2002-11-06 | 国家环境保护总局华南环境科学研究所 | Wet urea additive process for simultanously desulfurizing and denitrification |
| CN102213124A (en) * | 2011-05-24 | 2011-10-12 | 辽宁润迪精细化工有限公司 | Ultralow-temperature urea reducing agent composition |
| CN102213126A (en) * | 2011-05-24 | 2011-10-12 | 辽宁润迪精细化工有限公司 | Low-temperature urea reducing agent composition |
| CN104649621A (en) * | 2013-11-25 | 2015-05-27 | 刘汉斌 | Anti-freezing concrete and preparation method thereof |
| CN104265422A (en) * | 2014-08-03 | 2015-01-07 | 长春市永畅实业有限责任公司 | Low-temperature condition release ammonia reducing agent composition and preparation method thereof |
| CN104607041A (en) * | 2014-11-28 | 2015-05-13 | 河南弘康环保科技有限公司 | Ultra-low temperature urea solution used for vehicle |
| CN104533577A (en) * | 2015-01-13 | 2015-04-22 | 四川美丰化工股份有限公司 | Nitric oxide reducing agent with ultra-low freezing point and manufacturing method thereof |
| CN105498537A (en) * | 2015-11-30 | 2016-04-20 | 许昌学院 | Low-temperature diesel exhaust reducing agent and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107138044A (en) | 2017-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107138044B (en) | Diesel vehicle urea solution with low-temperature performance and preparation method thereof | |
| CN105498537A (en) | Low-temperature diesel exhaust reducing agent and preparation method thereof | |
| CN104862022B (en) | A kind of car tail gas purificant and preparation method thereof | |
| CN104265422B (en) | A kind of cryogenic conditions release ammonia reducing agent composition and preparation method thereof | |
| CN107261844B (en) | Production process of vehicle urea containing nano-scale catalyst | |
| CN104533577A (en) | Nitric oxide reducing agent with ultra-low freezing point and manufacturing method thereof | |
| CN104675483A (en) | Low-freezing-point nitric oxide reducing agent and preparation method thereof | |
| CN105536865A (en) | Diesel oil tail gas reducing agent for improving low temperature performances, and preparation method thereof | |
| CN107178408A (en) | A kind of ultralow temperature diesel vehicle urea liquid and preparation method thereof | |
| CN108315061A (en) | Automobile exhaust detergent | |
| CN108479390A (en) | A kind of automobile exhaust detergent | |
| CN108619907A (en) | A kind of urea for vehicle reducing agent solution | |
| CN109321292B (en) | High-alcohol gasoline additive composition for engine at low temperature and methanol gasoline thereof | |
| CN101560422B (en) | AdBlue composition as reducing agent for diesel engine with SCR technology | |
| CA3007682A1 (en) | Fuel additive comprising isopropanol, diesel fuel, gasoline fuel and water | |
| CN110923024A (en) | High-cleanness methanol diesel oil for vehicles | |
| CN108395915A (en) | A kind of compound ether alcohol clean gasoline based on non-national standard gasoline component | |
| CN112370968A (en) | Novel vehicle urea solution and preparation method thereof | |
| KR101589078B1 (en) | Manufacturing method of Additive to prevent freezing of Urea and Additive to prevent freezing of Urea manufactured by the same | |
| CN111939739A (en) | Low-temperature applicable automobile urea solution and preparation method thereof | |
| CN106590774B (en) | Diesel oil environment protection energy saving additive and environmental-friendly high-efficiency diesel | |
| CN101220300A (en) | Methanol diesel oil and formulation method thereof | |
| CN108219869B (en) | Low-carbon high-cleanness diesel vehicle fuel and preparation method thereof | |
| CN116407946B (en) | Low-temperature vehicle tail gas treatment fluid and preparation method thereof | |
| CN104449891A (en) | Biodiesel pour point depressant formula |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210106 Address after: 210033 rooms 501 and 502, building 02, No.1 Kechuang Road, Yaohua street, Qixia District, Nanjing City, Jiangsu Province Patentee after: Jiangsu adelu Environmental Protection Technology Co.,Ltd. Address before: Weidu District Bayi Road Xuchang city Henan province 461000 No. 88 Patentee before: XUCHANG University |