CN105498537A - Low-temperature diesel exhaust reducing agent and preparation method thereof - Google Patents
Low-temperature diesel exhaust reducing agent and preparation method thereof Download PDFInfo
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- CN105498537A CN105498537A CN201510857093.4A CN201510857093A CN105498537A CN 105498537 A CN105498537 A CN 105498537A CN 201510857093 A CN201510857093 A CN 201510857093A CN 105498537 A CN105498537 A CN 105498537A
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- 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
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- 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
Abstract
The invention discloses a low-temperature diesel exhaust reducing agent and a preparation method thereof. The reducing agent is composed of a component A, a component B, a component C and a component D and is characterized in that the components A, B, C and D are dissolved and mixed in a certain ratio. The component A is high-purity water with mass fraction of 40 to 70%; the component B is urea with mass fraction of 20 to 35%; the component C is micromolecular liquid amide with mass fraction of 5 to 20%; and the component D is micromolecular alcohol with mass fraction of 2 to 35%. Compared with a traditional urea reducing agent, the low-temperature diesel exhaust reducing agent can be used at low and ultralow temperature. The freezing point of the prepared reducing agent is lower than -15 to -35 DEG C, has surface tension obviously smaller than common urea reducing agents and is applicable in four seasons in the south China and in spring, summer, autumn, early winter and cold seasons in north China.
Description
Technical field
The present invention relates to chemical technology field, be specifically related to the novel low form diesel exhaust catalytic reducer of a class and composition 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 anti-low temperature exhaust gas from diesel vehicle inorganic agent, different regions spring and summer early winter in autumn and use cold season can be adapted to.This acid amides and Alcoholic 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 are all qualified.
A kind of low form diesel exhaust reducing agent, is made up of A, B, C, D tetra-kinds of components: component A is high purity water, and B component is
Urea, component C is Small molecular liquid amide class material, component D is small molecule alcohol material.
Component A, B, C and D dissolve in certain proportion, Homogeneous phase mixing obtains clear solution.
In solution, component A mass fraction is 40% ~ 70%, and to be 20% ~ 35%, component C mass fraction be B component mass fraction
5% ~ 20%, component D mass fraction is 2% ~ 35%.
In technical grade high purity water, add urea, abundant stirring and dissolving, then add amide substance and alcohols material respectively, fully
Namely anti-low temperature exhaust gas reductant solution is obtained after stirring and evenly mixing.
Component C is DMF, N-METHYLFORMAMIDE, one or more in DMA.
Component D is methyl alcohol, ethanol, one or more in ethylene glycol, propane diols, glycerine.
A kind of preparation method of low form diesel exhaust reducing agent: high-purity urea adds and adds in the round-bottomed flask of high purity water by (1), after grinding port plug sealing, is heated to 35 DEG C ~ 40 DEG C, is stirred to urea and dissolves 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) add small molecule alcohol by step (2) gained solution, with grinding port plug sealing, be stirred to solution and mix completely.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) preparation of pilot scale and commercial prod: the proportional amplification of all raw materials, after strong stirring to urea dissolves completely, add Small molecular liquid amide class material and small molecule alcohol material successively, strong stirring is to mixing completely, and the solution obtained is mixture solution of the present invention after the cartridge pressure filtration 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 40% ~ 70%, high-purity urea quality mark is 20% ~ 35%, and amide-type mass fraction is 5 ~ 20%, and small molecule alcohol mass fraction is 2 ~ 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 and low molecule alcohols are 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, be-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.
Add low-molecular-weight alcohols, as methyl alcohol, ethanol, ethylene glycol etc., this aqueous solution can be made to have lower freezing point, and there is better storage stability.Considering cost, ready availability, security and viscosity, particular methanol in the present invention, is secondly ethylene glycol, also can select the multiple combination in methyl alcohol, ethanol, ethylene glycol, propane diols, glycerine according to character, effect.
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 72mN/m, and traditional carbamide reducing agent is that the highly purified urea of employing and water are formulated, its surface tension reaches more than 64mN/m, and the methyl alcohol of 100% or ethanol are all at below 25mN/m, and ethylene glycol is 50mN/m, DMF is 26mN/m.Can predict, after adding above-mentioned substance in conventional urea solution, the surface tension of solution inherently declines, 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) add small molecule alcohol by step (2) gained solution, with grinding port plug sealing, be stirred to solution and mix completely.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) preparation of pilot scale and commercial prod: the proportional amplification of all raw materials, after strong stirring to urea dissolves completely, add Small molecular liquid amide class material and small molecule alcohol material successively, strong stirring is to mixing completely, and the solution obtained is mixture solution of the present invention after the cartridge pressure filtration of 0.5-0.8 μm.
Detailed description of the invention
Below by way of specific embodiment, the present invention will be further described.
A kind of low form diesel exhaust reducing agent, is made up of A, B, C, D tetra-kinds of components: component A is high purity water, and B component is
Urea, component C is Small molecular liquid amide class material, component D is small molecule alcohol material.
Component A, B, C and D dissolve in certain proportion, Homogeneous phase mixing obtains clear solution.
In solution, component A mass fraction is 40% ~ 70%, and to be 20% ~ 35%, component C mass fraction be B component mass fraction
5% ~ 20%, component D mass fraction is 2% ~ 35%.
In technical grade high purity water, add urea, abundant stirring and dissolving, then add amide substance and alcohols material respectively, fully
Namely anti-low temperature exhaust gas reductant solution is obtained after stirring and evenly mixing.
Component C is DMF, N-METHYLFORMAMIDE, one or more in DMA.
Component D is methyl alcohol, ethanol, one or more in ethylene glycol, propane diols, glycerine.
A kind of preparation method of low form diesel exhaust reducing agent: high-purity urea adds and adds in the round-bottomed flask of high purity water by (1), after grinding port plug sealing, is heated to 35 DEG C ~ 40 DEG C, is stirred to urea and dissolves 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) add small molecule alcohol by step (2) gained solution, with grinding port plug sealing, be stirred to solution and mix completely.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) preparation of pilot scale and commercial prod: the proportional amplification of all raw materials, after strong stirring to urea dissolves completely, add Small molecular liquid amide class material and small molecule alcohol material successively, strong stirring is to mixing completely, and the solution obtained is mixture solution of the present invention after the cartridge pressure filtration 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 40% ~ 70%, high-purity urea quality mark is 20% ~ 35%, and amide-type mass fraction is 5 ~ 20%, and small molecule alcohol mass fraction is 2 ~ 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 and low molecule alcohols are 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, be-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.
Add low-molecular-weight alcohols, as methyl alcohol, ethanol, ethylene glycol etc., this aqueous solution can be made to have lower freezing point, and there is better storage stability.Considering cost, ready availability, security and viscosity, particular methanol in the present invention, is secondly ethylene glycol, also can select the multiple combination in methyl alcohol, ethanol, ethylene glycol, propane diols, glycerine according to character, effect.
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 72mN/m, and traditional carbamide reducing agent is that the highly purified urea of employing and water are formulated, its surface tension reaches more than 64mN/m, and the methyl alcohol of 100% or ethanol are all at below 25mN/m, and ethylene glycol is 50mN/m, DMF is 26mN/m.Can predict, after adding above-mentioned substance in conventional urea solution, the surface tension of solution inherently declines, 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) add small molecule alcohol by step (2) gained solution, with grinding port plug sealing, be stirred to solution and mix completely.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) preparation of pilot scale and commercial prod: the proportional amplification of all raw materials, after strong stirring to urea dissolves completely, add Small molecular liquid amide class material and small molecule alcohol material successively, strong stirring is to mixing completely, and the solution obtained is mixture solution of the present invention after the cartridge pressure filtration of 0.5-0.8 μm.
Embodiment 1
(1) high-purity for 7.2822g urea is added in the round-bottomed flask adding 15.1660g 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 3.7440gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) add 0.7859g methyl alcohol by step (2) gained solution, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) after measured ,-18 DEG C, mixture solution freezing point, surface tension 57.5mN/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 7.2176g urea is added in the round-bottomed flask adding 15.1024g 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 3.6189gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) add 1.6670g methyl alcohol by step (2) gained solution, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) after measured ,-20 DEG C, mixture solution freezing point, surface tension 56mN/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 7.2172g urea is added in the round-bottomed flask adding 15.2068g 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 3.8370gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) add 2.7330g methyl alcohol by step (2) gained solution, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) after measured ,-24 DEG C, mixture solution freezing point, surface tension 53mN/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 7.2459g urea is added in the round-bottomed flask adding 15.3664g 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 3.9228gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) add 3.7620g methyl alcohol by step (2) gained solution, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) after measured ,-27 DEG C, mixture solution freezing point, surface tension 52mN/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 7.2327g urea is added in the round-bottomed flask adding 15.0896g 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 3.6583gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) add 5.0317g methyl alcohol by step (2) gained solution, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) after measured ,-30 DEG C, mixture solution freezing point, surface tension 51mN/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 7.2956g urea is added in the round-bottomed flask adding 15.2663g 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 3.7346gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) add 6.5125g methyl alcohol by step (2) gained solution, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) after measured ,-35 DEG C, mixture solution freezing point, surface tension 45.6mN/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 7
(1) high-purity for 14.4166g urea is added in the round-bottomed flask adding 30.3376g 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 7.6287gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) add 3.3394g ethylene glycol by step (2) gained solution, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) after measured ,-20.4 DEG C, mixture solution freezing point, surface tension 56.6mN/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 8
(1) high-purity for 14.4721g urea is added in the round-bottomed flask adding 30.0903g 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 7.5120gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) add 5.3336g ethylene glycol by step (2) gained solution, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) after measured ,-22.6 DEG C, mixture solution freezing point, surface tension 55.6mN/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 9
(1) high-purity for 14.4885g urea is added in the round-bottomed flask adding 30.1866g 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 7.5174gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) add 7.5220g ethylene glycol by step (2) gained solution, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) after measured ,-24.3 DEG C, mixture solution freezing point, surface tension 54mN/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 10
(1) high-purity for 14.5648g urea is added in the round-bottomed flask adding 30.0274g 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 7.5198gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) add 10.0761g ethylene glycol by step (2) gained solution, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) after measured ,-27 DEG C, mixture solution freezing point, surface tension 52.7mN/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 11
(1) high-purity for 14.5562g urea is added in the round-bottomed flask adding 30.1831g 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 7.7760gN, dinethylformamide, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(3) add 12.9029g ethylene glycol by step (2) gained solution, after grinding port plug sealing, magnetic agitation mixes completely to solution.
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention.
(5) after measured ,-30 DEG C, mixture solution freezing point, surface tension 51mN/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 (7)
1. a low form diesel exhaust reducing agent, is characterized in that: be made up of A, B, C, D tetra-kinds of components: component A is high purity water, B component is urea, and component C is Small molecular liquid amide class material, component D is small molecule alcohol material.
2. a kind of low form diesel exhaust reducing agent according to claim 1, is characterized in that: component A, B, C and D dissolve in certain proportion, Homogeneous phase mixing obtains clear solution.
3. a kind of low form diesel exhaust reducing agent according to claim 2, it is characterized in that: in solution, component A mass fraction is 40% ~ 70%, and B component mass fraction is 20% ~ 35%, component C mass fraction is 5% ~ 20%, component D mass fraction is 2% ~ 35%.
4. a kind of low form diesel exhaust reducing agent according to claim 2, it is characterized in that: in technical grade high purity water, add urea, abundant stirring and dissolving, then adds amide substance and alcohols material respectively, namely obtains anti-low temperature exhaust gas reductant solution after fully stirring and evenly mixing.
5. a kind of low form diesel exhaust reducing agent according to claim 1, it is characterized in that, component C is DMF, N-METHYLFORMAMIDE, one or more in DMA.
6. a kind of low form diesel exhaust reducing agent according to claim 1, is characterized in that: component D is methyl alcohol, ethanol, one or more in ethylene glycol, propane diols, glycerine.
7. the preparation method of a low form diesel exhaust reducing agent, it is characterized in that: high-purity urea adds and adds in the round-bottomed flask of high purity water by (1), after grinding port plug sealing, be heated to 35 DEG C ~ 40 DEG C, be stirred to urea to 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) add small molecule alcohol by step (2) gained solution, with grinding port plug sealing, be stirred to solution and mix completely;
(4) by step (3) gained solution filtering accuracy be 0.8pm cartridge pressure filter, namely obtain low form tail gas catalytic reducer product of the present invention;
(5) preparation of pilot scale and commercial prod: the proportional amplification of all raw materials, after strong stirring to urea dissolves completely, add Small molecular liquid amide class material and small molecule alcohol material successively, strong stirring is to mixing completely, and the solution obtained is mixture solution of the present invention after the cartridge pressure filtration of 0.5-0.8 μm.
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