CN108404665A - Automobile urea liquid and preparation method thereof - Google Patents
Automobile urea liquid and preparation method thereof Download PDFInfo
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- CN108404665A CN108404665A CN201810104490.8A CN201810104490A CN108404665A CN 108404665 A CN108404665 A CN 108404665A CN 201810104490 A CN201810104490 A CN 201810104490A CN 108404665 A CN108404665 A CN 108404665A
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000004202 carbamide Substances 0.000 title claims abstract description 58
- 239000007788 liquid Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 36
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims abstract description 36
- -1 Alkyl phenol Chemical compound 0.000 claims abstract description 18
- 239000000138 intercalating agent Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000008367 deionised water Substances 0.000 claims abstract description 14
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 14
- VZTDIZULWFCMLS-UHFFFAOYSA-N ammonium formate Chemical compound [NH4+].[O-]C=O VZTDIZULWFCMLS-UHFFFAOYSA-N 0.000 claims abstract description 12
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims abstract description 12
- 235000011130 ammonium sulphate Nutrition 0.000 claims abstract description 12
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 9
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 9
- DBVJJBKOTRCVKF-UHFFFAOYSA-N Etidronic acid Chemical group OP(=O)(O)C(O)(C)P(O)(O)=O DBVJJBKOTRCVKF-UHFFFAOYSA-N 0.000 claims description 8
- 239000012263 liquid product Substances 0.000 claims description 6
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 229940005574 sodium gluconate Drugs 0.000 claims description 4
- 235000012207 sodium gluconate Nutrition 0.000 claims description 4
- 239000000176 sodium gluconate Substances 0.000 claims description 4
- JJJOZVFVARQUJV-UHFFFAOYSA-N 2-ethylhexylphosphonic acid Chemical compound CCCCC(CC)CP(O)(O)=O JJJOZVFVARQUJV-UHFFFAOYSA-N 0.000 claims description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims 2
- XYJLPCAKKYOLGU-UHFFFAOYSA-N 2-phosphonoethylphosphonic acid Chemical compound OP(O)(=O)CCP(O)(O)=O XYJLPCAKKYOLGU-UHFFFAOYSA-N 0.000 claims 1
- 240000007594 Oryza sativa Species 0.000 claims 1
- 235000007164 Oryza sativa Nutrition 0.000 claims 1
- 150000001412 amines Chemical class 0.000 claims 1
- 150000004985 diamines Chemical class 0.000 claims 1
- 235000009566 rice Nutrition 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 21
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 17
- 229910021529 ammonia Inorganic materials 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 7
- 229920003171 Poly (ethylene oxide) Polymers 0.000 abstract description 6
- 239000007789 gas Substances 0.000 abstract description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 abstract description 5
- 239000013522 chelant Substances 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- FPVVYTCTZKCSOJ-UHFFFAOYSA-N Ethylene glycol distearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCOC(=O)CCCCCCCCCCCCCCCCC FPVVYTCTZKCSOJ-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 150000003009 phosphonic acids Chemical class 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a kind of automobile urea liquid and preparation method thereof, each component and mass percent it is as follows：Urea liquid 32.5%；Methanol 5~7%；Ammonium formate 4~6%；Ammonium sulfate 5~8%；Alkyl phenol polyoxyethylene ether 2~4%；Propylene glycol 5~8%；Polyoxyethylene stearate 2~5%；Intercalating agent 5.5~8%；Deionized water 21.5~39%.The formula of automobile urea liquid provided by the invention is reasonable, and ammonium formate and ammonium sulfate can promote urea to decompose generation ammonia in a heated condition, and the ammonia performance generated is decomposed with urea and is acted synergistically so that the conversion ratio of catalyzing and reducing nitrogen oxides greatly improves；Methanol, propylene glycol and polyoxyethylene stearate can promote miscible characteristic, and antifreezing effect is good, and stability is high, greatly promotes the scope of application；Contained intercalating agent has very strong chelant ability to each material component, handle thoroughly to the nitrogen oxides in tail gas, high treating effect is conducive to environmental protection.
Description
Technical field
The invention belongs to chemical technology fields, and in particular to a kind of automobile urea liquid and preparation method thereof.
Background technology
As China's car ownership is continuously increased, the nitrogen oxides and particulate matter of motor vehicle emission are to human health and air
The harm of environment has caused the concern of height.It is reported that countries in the world are devoted to reduce the research of this two emissions, just
For China, " state IV " discharge standard having been carried out means that the discharge of vehicle exhaust must use more advanced technology.
Lot of experiments shows that SCR technology (SCR) is most suitable diesel vehicle " state IV " discharge solution, and
This technology must utilize urea liquid to the NO in tail gasXIt is handled, thus urea for vehicle solution is discharged at " state IV "
The essential product of solution.Urea/SCR technology by spraying into a certain amount of aqueous solution of urea into exhaust pipe, urea using
Evaporation, pyrolysis and hydrolytic process obtain reducing agent NH3, NH3It is selective by NO under the effect of the catalystXIt is reduced to N2, to
Realizing reduces NOXDischarge.If not loading diesel engine vent gas treatment fluid or purity not enough or quality being of poor quality, vehicle can all occur
Engine automatic retarding.Meanwhile quality diesel engine vent gas treatment fluid of poor quality can pollute the catalysis in SCR catalytic reactors
Agent causes serious consequence.
Currently, traditional urea for vehicle freezing point uses the vehicle of SCR technology in low temperature ring at -11 DEG C or so, for satisfaction
It is used under border, typically adds anti-icing fluid circulating-heating or electrically heated system and heat preservation system in the automobile-used urea system of tradition
System increases the add-on parts such as heating tube loop, temperature sensor, insulating layer, undoubtedly also increases the complexity of system, therefore
Barrier rate is high, in addition, needing idling of vehicle certain time from winter when vehicle, after the temperature rise for waiting engine coolants, relies on
Circulating cooling liquid is come the shortcomings of melting the urea to have frozen.Therefore, exploitation low freezing point urea for vehicle solution is imperative.
Invention content
In view of the above-mentioned deficiencies, one of the object of the invention is, it is reasonable to provide a kind of formula, prepares simple, the scope of application
Extensively, it is conducive to the automobile urea liquid of environmental protection.
The object of the invention also resides in, and provides a kind of method preparing above-mentioned automobile urea liquid.The preparation process letter of this method
Easily, it is easy to accomplish, can rapidly and efficiently prepare it is applied widely, be conducive to environmental protection automobile urea liquid.
To achieve the above object, technical solution provided by the present invention is：
A kind of automobile urea liquid, each component and mass percent it is as follows：
A kind of preparation method of above-mentioned automobile urea liquid, which is characterized in that it includes the following steps：
(1) deionized water is weighed by weight percentage, is subsequently poured into agitator, and is heated to 70~75 DEG C, is then kept
Constant temperature；
(2) it weighs urea liquid by weight percentage to be added in deionized water, turn on agitator stirs evenly；
(3) methanol, propylene glycol and polyoxyethylene stearate are weighed by weight percentage and is added in deionized water, are opened
Blender is opened, is stirred evenly；
(4) ammonium formate, ammonium sulfate and alkyl phenol polyoxyethylene ether are weighed by weight percentage, pours into agitator, and stirring is equal
It is even；
(5) solution temperature is down to 45~55 DEG C hereinafter, weigh intercalating agent by weight percentage in bucket to be mixed, is subsequently poured into
In agitator, automobile urea liquid product is made after stirring evenly.
(6) automobile urea liquid product is filtered using miillpore filter.
As an improvement of the present invention, the micropore diameter of the miillpore filter is 10~30 microns.
As an improvement of the present invention, the rotating speed of the blender is 80~120 revs/min.
As an improvement of the present invention, the intercalating agent is 1-hydroxy ethylidene-1,1-diphosphonic acid, the adjacent sodium of ethylenediamine two
Or sodium gluconate.The 1-hydroxy ethylidene-1,1-diphosphonic acid that the 1-hydroxy ethylidene-1,1-diphosphonic acid is 50%.
As an improvement of the present invention, the rotating speed of the blender in the step (1) is 80~120 revs/min.
Beneficial effects of the present invention are：The formula of automobile urea liquid provided by the invention is reasonable, and ammonium formate and ammonium sulfate exist
Urea can be promoted to decompose under heating condition and generate ammonia, and itself can also decompose generation ammonia at high temperature, decomposed with urea
The ammonia of generation plays synergistic effect so that the conversion ratio of catalyzing and reducing nitrogen oxides greatly improves；Methanol, propylene glycol and polyoxy
Miscible characteristic can be promoted by changing ethylene stearate, and antifreezing effect is good, and stability is high, greatly promotes the scope of application；Contained chelating
Agent has very strong chelant ability to each material component, handle thoroughly to the nitrogen oxides in tail gas, high treating effect, profit
In environmental protection.The preparation process of method provided by the invention is simple, is easily achieved, and production efficiency is high, can rapidly and efficiently prepare suitable
It is wide with range, it is conducive to the automobile urea liquid of environmental protection.
With reference to embodiment, the invention will be further described.
Specific implementation mode
Embodiment 1：Present embodiments provide a kind of automobile urea liquid, each component and mass percent it is as follows：Urea
Solution 32.5%；Methanol 5%；Ammonium formate 4%；Ammonium sulfate 5%；Alkyl phenol polyoxyethylene ether 2%；Propylene glycol 5%；Polyoxyethylene
Alkene stearate 2%；Intercalating agent 5.5%；Deionized water 39%.
A kind of preparation method of above-mentioned automobile urea liquid comprising following steps：
(1) deionized water is weighed by weight percentage, is subsequently poured into agitator, and is heated to 70~75 DEG C, is then kept
Constant temperature；
(2) it weighs urea liquid by weight percentage to be added in deionized water, turn on agitator stirs evenly；
(3) methanol, propylene glycol and polyoxyethylene stearate are weighed by weight percentage and is added in deionized water, are opened
Blender is opened, is stirred evenly；
(4) ammonium formate, ammonium sulfate and alkyl phenol polyoxyethylene ether are weighed by weight percentage, pours into agitator, and stirring is equal
It is even；
(5) solution temperature is down to 45~55 DEG C hereinafter, weigh intercalating agent by weight percentage in bucket to be mixed, is subsequently poured into
In agitator, automobile urea liquid product is made after stirring evenly.
(6) automobile urea liquid product is filtered using miillpore filter.Preferably, the micropore diameter of the miillpore filter is
10~30 microns.
Preferably, the rotating speed of the blender in the step (1) is 80~120 revs/min.The intercalating agent is hydroxy ethylidene
The adjacent sodium of di 2 ethylhexyl phosphonic acid, ethylenediamine two or sodium gluconate.The hydroxy ethylidene two that the 1-hydroxy ethylidene-1,1-diphosphonic acid is 50%
Phosphonic acids.
The preparation process of method provided by the invention is simple, is easily achieved, and production efficiency is high, can rapidly and efficiently prepare suitable
It is wide with range, it is conducive to the automobile urea liquid of environmental protection.
Embodiment 2, a kind of automobile urea liquid provided by the embodiment and preparation method thereof, substantially the same manner as Example 1, area
It is not：The each component and its mass percent of automobile urea liquid are as follows：Urea liquid 32.5%；Methanol 7%；Ammonium formate 6%；
Ammonium sulfate 8%；Alkyl phenol polyoxyethylene ether 4%；Propylene glycol 8%；Polyoxyethylene stearate 5%；Intercalating agent 8%；Go from
Sub- water 21.5%.
Embodiment 3, a kind of automobile urea liquid provided by the embodiment and preparation method thereof, substantially the same manner as Example 1, area
It is not：Urea liquid 32.5%；Methanol 6%；Ammonium formate 5%；Ammonium sulfate 7%；Alkyl phenol polyoxyethylene ether 3%；Propylene glycol
6%；Polyoxyethylene stearate 4%；Intercalating agent 6%；Deionized water 30.5%.
Embodiment 4, a kind of automobile urea liquid provided by the embodiment and preparation method thereof, substantially the same manner as Example 1, area
It is not：The each component and its mass percent of automobile urea liquid are as follows：Urea liquid 32.5%；Methanol 6.5%；Ammonium formate
4.5%；Ammonium sulfate 6%；Alkyl phenol polyoxyethylene ether 2.5%；Propylene glycol 7%；Polyoxyethylene stearate 3%；Intercalating agent
7%；Deionized water 31%.
Embodiment 5, a kind of automobile urea liquid provided by the embodiment and preparation method thereof, substantially the same manner as Example 1, area
It is not：The each component and its mass percent of automobile urea liquid are as follows：Urea liquid 32.5%；Methanol 5.5%；Ammonium formate
4%；Ammonium sulfate 7%；Alkyl phenol polyoxyethylene ether 2%；Propylene glycol 5%；Polyoxyethylene stearate 3%；Intercalating agent 6%；
Deionized water 35%.
The formula of automobile urea liquid provided by the invention is reasonable, and ammonium formate and ammonium sulfate can promote urea in a heated condition
It decomposes and generates ammonia, and itself can also decompose generation ammonia at high temperature, the ammonia performance generated is decomposed with urea and cooperates with work
With so that the conversion ratio of catalyzing and reducing nitrogen oxides greatly improves；Methanol, propylene glycol and polyoxyethylene stearate can be promoted
Miscible characteristic, antifreezing effect is good, and stability is high, greatly promotes the scope of application；Contained intercalating agent has very each material component
Strong chelant ability handle thoroughly the nitrogen oxides in tail gas, and high treating effect is conducive to environmental protection.Above-described embodiment is only
For the preferable embodiment of the present invention, the present invention cannot enumerate out whole embodiments, it is all using above-described embodiment it
One technical solution, or the equivalent variations done according to above-described embodiment, all fall in the scope of protection of the present invention.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and is changed.Therefore, the invention is not limited in specific implementation modes disclosed and described above, to the present invention's
Some modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, although being used in this specification
Some specific terms, these terms are merely for convenience of description, does not limit the present invention in any way, using with its
Other urea solutions and preparation method, all fall in the scope of protection of the present invention obtained from same or similar method and component.
Claims (9)
1. a kind of automobile urea liquid, which is characterized in that its each component and mass percent is as follows：
2. automobile urea liquid according to claim 1, which is characterized in that the intercalating agent is 1-hydroxy ethylidene-1,1-diphosphonic acid, second
The adjacent sodium of diamines two or sodium gluconate.
3. automobile urea liquid according to claim 2, which is characterized in that the hydroxyl that the 1-hydroxy ethylidene-1,1-diphosphonic acid is 50%
Ethylene-diphosphonic acid.
4. a kind of preparation method of the automobile urea liquid described in claim 1-3 any one, which is characterized in that it includes following
Step：
(1) deionized water is weighed by weight percentage, is subsequently poured into agitator, and is heated to 70~75 DEG C, then keeps constant temperature；
(2) it weighs urea liquid by weight percentage to be added in deionized water, turn on agitator stirs evenly；
(3) methanol, propylene glycol and polyoxyethylene stearate are weighed by weight percentage and is added in deionized water, and unlatching is stirred
Device is mixed, is stirred evenly；
(4) ammonium formate, ammonium sulfate and alkyl phenol polyoxyethylene ether are weighed by weight percentage, pours into agitator, are stirred evenly；
(5) solution temperature is down to 45~55 DEG C hereinafter, weigh intercalating agent by weight percentage in bucket to be mixed, is subsequently poured into stirring
In bucket, automobile urea liquid product is made after stirring evenly.
5. preparation method according to claim 8, which is characterized in that its is further comprising the steps of：(6) miillpore filter is used
Automobile urea liquid product is filtered.
6. preparation method according to claim 5, which is characterized in that the micropore diameter of the miillpore filter is 10~30 micro-
Rice.
7. preparation method according to claim 8, which is characterized in that the rotating speed of the blender is 80~120 revs/min.
8. preparation method according to claim 4, which is characterized in that the intercalating agent is 1-hydroxy ethylidene-1,1-diphosphonic acid, second two
The adjacent sodium of amine two or sodium gluconate.
9. preparation method according to claim 8, which is characterized in that the hydroxyl second that the 1-hydroxy ethylidene-1,1-diphosphonic acid is 50%
Pitch di 2 ethylhexyl phosphonic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810104490.8A CN108404665A (en) | 2018-02-02 | 2018-02-02 | Automobile urea liquid and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810104490.8A CN108404665A (en) | 2018-02-02 | 2018-02-02 | Automobile urea liquid and preparation method thereof |
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Family
ID=63127406
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| CN201810104490.8A Pending CN108404665A (en) | 2018-02-02 | 2018-02-02 | Automobile urea liquid and preparation method thereof |
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| CN110394059A (en) * | 2018-08-22 | 2019-11-01 | 山西思淼环保技术开发有限公司 | - 25 DEG C of antifreeze urea for vehicle of one kind and preparation method thereof |
| CN110559930A (en) * | 2019-09-16 | 2019-12-13 | 山东益丰生化环保股份有限公司 | Vehicle urea solution and preparation method thereof |
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| CN114478322A (en) * | 2021-12-30 | 2022-05-13 | 江苏艾德露环保科技有限公司 | Anti-crystallizing agent of urea solution for vehicle and preparation method thereof |
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| CN110394059A (en) * | 2018-08-22 | 2019-11-01 | 山西思淼环保技术开发有限公司 | - 25 DEG C of antifreeze urea for vehicle of one kind and preparation method thereof |
| CN110559930A (en) * | 2019-09-16 | 2019-12-13 | 山东益丰生化环保股份有限公司 | Vehicle urea solution and preparation method thereof |
| CN110559930B (en) * | 2019-09-16 | 2021-11-30 | 山东益丰生化环保股份有限公司 | Vehicle urea solution and preparation method thereof |
| CN112090279A (en) * | 2020-09-30 | 2020-12-18 | 河南弘康环保科技有限公司 | Preparation method of vehicle urea capable of degrading nitric oxide and preventing low-temperature crystallization |
| CN114478322A (en) * | 2021-12-30 | 2022-05-13 | 江苏艾德露环保科技有限公司 | Anti-crystallizing agent of urea solution for vehicle and preparation method thereof |
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