CN110394058A - A kind of urea for vehicle and preparation method thereof that will not be crystallized - Google Patents
A kind of urea for vehicle and preparation method thereof that will not be crystallized Download PDFInfo
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- CN110394058A CN110394058A CN201810960051.7A CN201810960051A CN110394058A CN 110394058 A CN110394058 A CN 110394058A CN 201810960051 A CN201810960051 A CN 201810960051A CN 110394058 A CN110394058 A CN 110394058A
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- urea
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- ammonium formate
- crystallized
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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
-
- 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
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- 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 the urea for vehicle and preparation method thereof that one kind will not crystallize, it is using urea, ammonium formate and deionized water as raw material, the preparation method is the finished product by being obtained after the addition ammonium formate into deionized water and urea mixing through 0.3~0.7 μm of membrane filtration.Even if the present invention is not modified urea injection system, without crystallization is frequently removed, the generation of diesel vehicle urea for vehicle crystalline polamer is reduced to a great extent.
Description
Technical field
The invention belongs to technical field of organic chemistry, are related to a kind of urea for vehicle, will not crystallize more particularly to one kind
Urea for vehicle and preparation method thereof.
Background technique
Studies have shown that motor vehicle exhaust emission accounts for 30% or so of the national PM2.5 total amount of pollutant, motor vehicle exhaust emission is to make
At one of the arch-criminal of China's haze weather.And in the pollutant that vehicle exhaust is discharged, from heavy-duty diesel vehicle
Tail gas pollution is up to 2/3 or more.Data show that diesel vehicle ownership in China's only accounts for the 17% of the total ownership of automobile, but bavin at present
Nitrogen oxides (the NO of oily vehicle dischargeX) and fine grained (PM) pollutant but occupy 60% and the 90% of vehicular emission total amount with
On.Diesel vehicle pollution control is the emphasis that vehicular emission is administered.
It is most of in the diesel vehicle of five standard of state at present to have used exhaust aftertreatment (abbreviation SCR) engine technology, it is this
Technology needs to add urea for vehicle solution, it is a kind of nitrous oxides selectivity catalytic reducer, be urea concentration be 31.8%-
33.3% aqueous solution.Diesel vehicle is arranged in pairs or groups after this urea liquid, the NO in exhaust emissionsXFree of contamination nitrogen can be broken down into
Gas and vapor can directly reduce haze pollution, to meet discharge standard to NOXWith the limitation of PM.Using this technology
Engine fuel economy is good, it is small to engine modification, to fuel oil and machine oil require it is lower, have in technology upgrading continuity
Advantage, therefore SCR technology is the heavy-duty diesel vehicle emission-reduction technology route for being most suitable for China's national situation.Currently, domestic medium-heavy truck, visitor
Vehicle, public transit vehicle largely use SCR technology route to reach discharge standard requirement, and therefore, urea for vehicle needed for SCR system is molten
Liquid becomes the consumables being equal with diesel oil, wide market.Although domestic urea for vehicle solution market is at the early-stage, city
Field potential of demand is but quite huge, and domestic urea for vehicle solution market sales volume increases rapidly.But it is molten in diesel vehicle urea for vehicle
In the use process of liquid, urea for vehicle often will appear crystallization, and there are mainly two types of reasons, and one is urea liquid moisture to be steamed
It sends out, crystallization occurs in urea；Second is that generating gluing urea byproduct when urea reaction, be easiest to occur crystallizing is urine
The places such as plain injection unit end, exhaust pipe.
Once crystallization generates, it can not only make the even thoroughly blocking of engine exhaust tube portion, can also cause discarded flow
Change, the reduction of conversion ratio, exhaust also can be impacted；And urea can not be used completely, cause waste, urea
Spraying distribution also can unevenly be influenced, and finally result in the spray nozzle clogging of jet module, in the case of high-temperature exhaust air, urea
Crystallization, which is decomposed, can also generate ammonia, polluted environment.
Currently, usually being sprayed the urea on diesel vehicle to reduce the generation of diesel vehicle urea for vehicle crystalline polamer
System, especially nozzle, improve, this just needs to be transformed every diesel vehicle, certainly will increase the investment of diesel vehicle at
This, hinders the universal of urea for vehicle, and therefore, how to prevent urea for vehicle crystallization is current urgent problem.
Summary of the invention
In order to solve the problems in the existing technology, the invention discloses urea for vehicle and its system that one kind will not crystallize
Even if not being modified to urea injection system, without crystallization is frequently removed, it is automobile-used that diesel vehicle is reduced to a great extent in Preparation Method
The generation of urea crystals phenomenon.
To achieve the above objectives, the technical solution adopted by the present invention are as follows:
On the one hand, it is made of the raw material of following parts by weight the invention discloses the urea for vehicle that one kind will not crystallize:
25~35 parts of urea, 60~80 parts of ammonium formate, 40~60 parts of deionized water.
The above-mentioned urea for vehicle that will not be crystallized is made of the raw material of following parts by weight as a preferred implementation manner,
: 28~32 parts of urea, 65~75 parts of ammonium formate, 45~55 parts of deionized water.
Preferably, the above-mentioned urea for vehicle that will not be crystallized is made of the raw material of following parts by weight: 30 parts of urea, formic acid
70 parts of ammonium, 50 parts of deionized water.
Further, the ammonium formate is by introducing ammonia into formic acid, and obtaining nitrogen content is 20% (mass fraction)
Ammonium formate, the present invention in formic acid and methanol be analysis it is pure.
The urea is high-purity urea that mass fraction is 60-70%, is the urine after flash distillation, raw to entire urine
Production. art carries out strict control, guarantees urine purity, uses urine as raw material compared with granular urea, save evaporation and granulation
Technique, cost is relatively low, and the content of biuret is low；Preferably, the urea is high-purity urea that mass fraction is 65%.
On the other hand, the invention also discloses the preparation method of the above-mentioned urea for vehicle that will not be crystallized, include the following steps:
It is added into deionized water after ammonium formate and urea mixes, the finished product obtained through 0.3~0.7 μm of membrane filtration.
Urea liquid is that the urine after flash distillation saves evaporation and prilling compared with granular urea in the present invention,
Cost is relatively low, and the content of biuret is low, but in the environment of 100~130 DEG C, especially fast, the easy production of the water evaporation of surrounding
Raw crystallization；Its storage chemical property of ammonium formate is stablized, molecular formula NH4HCOO, effective element N content is 21.67%, 180
NH is resolved at DEG C3And HCOOH/CO+H2O, can be used to partially substitute urea can release NH3Presoma ingredient, can be
It normally decomposes within the scope of engine exhaust temperature without staying residue；Due to urea for vehicle solution crystallization temperature and concentration, pressure
It is related, after the ammonium formate of appropriate ratio is added, the concentration and temperature of urea for vehicle can maintain substantially accordingly to be not easy to tie
In the state of crystalline substance, it not only can guarantee the quick of ammonium formate and uniformly decomposed, but also be avoided that the generation of urea white crystals, be not necessarily to
Increase or improve nozzle system on automobile；The purity of deionized water is higher, by underwater micro- organic matter, chloride ion and metal from
Sub etc. these are all the hazardous material removals of SCR post-processing catalyst.
The urea liquid composition that the present invention will not crystallize is simple, and preparation is convenient, and universality is strong, has very high practical valence
Value.
Specific embodiment
It is described below for disclosing the present invention so that those skilled in the art can be realized the present invention.It is excellent in being described below
Embodiment is selected to be only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.
Embodiment 1
A kind of urea for vehicle that will not be crystallized is made of the raw material of following parts by weight: 25 parts of urea, ammonium formate 80
Part, 40 parts of deionized water；Wherein, ammonium formate is by introducing ammonia into formic acid, and obtaining nitrogen content is 20% (mass fraction)
Ammonium formate；Urea is high-purity urea that mass fraction is 70%, is the urine after flash distillation；Formic acid and methanol are analysis
It is pure；The above-mentioned urea for vehicle that will not be crystallized the preparation method comprises the following steps: being added into deionized water after ammonium formate and urea mixes, warp
The finished product that 0.3~0.7 μm of membrane filtration obtains.
After measured, the urea for vehicle solution is tasteless, and clear appearance is transparent, density 1.09g/cm3, Biuret Content
0.02%, impurity content is met the requirements of the standard, and Compatibility in Plastics is met the requirements；After (25 DEG C) storage 48h of room temperature, outside
It sees, smell is without the perceptible variation of sense organ, performance indicator detection qualification.
ESC working condition measurement is carried out on the diesel engine machine frame that discharge capacity is 8.6 liters, low temperature urea for vehicle of the invention is molten
Liquid is under specified discharge rate, after SCR postprocessor is handled, NOXDischarge can reach the requirement of state 4, use cleaning one in 1~1.5 year
It is secondary.
Embodiment 2
A kind of urea for vehicle that will not be crystallized is made of the raw material of following parts by weight: 35 parts of urea, ammonium formate 60
Part, 60 parts of deionized water；Wherein, ammonium formate is by introducing ammonia into formic acid, and obtaining nitrogen content is 20% (mass fraction)
Ammonium formate；Urea is high-purity urea that mass fraction is 60%, is the urine after flash distillation；Formic acid and methanol are analysis
It is pure；The above-mentioned urea for vehicle that will not be crystallized the preparation method comprises the following steps: being added into deionized water after ammonium formate and urea mixes, warp
The finished product that 0.3~0.7 μm of membrane filtration obtains.
After measured, low temperature urea for vehicle solution appearance is as clear as crystal, density 1.10g/cm3, Biuret Content 0.02%,
Impurity content is met the requirements of the standard, and Compatibility in Plastics is met the requirements；After (28 DEG C) storage 48h of room temperature, appearance, smell without
The variation of sensory perceptible, performance indicator detection are qualified.
ESC working condition measurement is carried out on the diesel engine machine frame that discharge capacity is 8.6 liters, low temperature urea for vehicle of the invention is molten
Liquid is under specified discharge rate, after SCR postprocessor is handled, NOXDischarge can reach the requirement of state 4, use cleaning one in 1~1.5 year
It is secondary.
Embodiment 3
A kind of urea for vehicle that will not be crystallized is made of the raw material of following parts by weight: 28 parts of urea, ammonium formate 75
Part, 45 parts of deionized water；Wherein, ammonium formate is by introducing ammonia into formic acid, and obtaining nitrogen content is 20% (mass fraction)
Ammonium formate；Urea is high-purity urea that mass fraction is 62%, is the urine after flash distillation；Formic acid and methanol are analysis
It is pure；The above-mentioned urea for vehicle that will not be crystallized the preparation method comprises the following steps: being added into deionized water after ammonium formate and urea mixes, warp
The finished product that 0.3~0.7 μm of membrane filtration obtains.
After measured, low temperature urea for vehicle solution appearance is as clear as crystal, density 1.09g/cm3, Biuret Content 0.02%,
Impurity content is met the requirements of the standard, and Compatibility in Plastics is met the requirements；After 10 DEG C of storage 48h, appearance, smell can without sense organ
The variation discovered, performance indicator detection are qualified.
ESC working condition measurement is carried out on the diesel engine machine frame that discharge capacity is 8.6 liters, low temperature urea for vehicle of the invention is molten
Liquid is under specified discharge rate, after SCR postprocessor is handled, NOXDischarge can reach the requirement of state 4, use cleaning one in 1~1.5 year
It is secondary.
Embodiment 4
A kind of urea for vehicle that will not be crystallized is made of the raw material of following parts by weight: 32 parts of urea, ammonium formate 65
Part, 55 parts of deionized water；Wherein, ammonium formate is by introducing ammonia into formic acid, and obtaining nitrogen content is 20% (mass fraction)
Ammonium formate；Urea is high-purity urea that mass fraction is 68%, is the urine after flash distillation；Formic acid and methanol are analysis
It is pure；The above-mentioned urea for vehicle that will not be crystallized the preparation method comprises the following steps: being added into deionized water after ammonium formate and urea mixes, warp
The finished product that 0.3~0.7 μm of membrane filtration obtains.
After measured, low temperature urea for vehicle solution is tasteless, and clear appearance is transparent, density 1.08g/cm3, Biuret Content
0.02%, impurity content is met the requirements of the standard, and Compatibility in Plastics is met the requirements；After 0 DEG C of storage 48h, appearance, smell without
The variation of sensory perceptible, performance indicator detection are qualified.
ESC working condition measurement is carried out on the diesel engine machine frame that discharge capacity is 8.6 liters, low temperature urea for vehicle of the invention is molten
Liquid is under specified discharge rate, after SCR postprocessor is handled, NOXDischarge can reach the requirement of state 4, use cleaning one in 1~1.5 year
It is secondary.
Embodiment 5
A kind of urea for vehicle that will not be crystallized is made of the raw material of following parts by weight: 30 parts of urea, ammonium formate 70
Part, 50 parts of deionized water；Wherein, ammonium formate is by introducing ammonia into formic acid, and obtaining nitrogen content is 20% (mass fraction)
Ammonium formate；Urea is high-purity urea that mass fraction is 65%, is the urine after flash distillation；Formic acid and methanol are analysis
It is pure；The above-mentioned urea for vehicle that will not be crystallized the preparation method comprises the following steps: being added into deionized water after ammonium formate and urea mixes, warp
The finished product that 0.3~0.7 μm of membrane filtration obtains.
After measured, low temperature urea for vehicle solution is tasteless, and clear appearance is transparent, density 1.1g/cm3, Biuret Content
0.02%, impurity content is met the requirements of the standard, and Compatibility in Plastics is met the requirements；After -5 DEG C of storage 48h, appearance, smell
Without the perceptible variation of sense organ, performance indicator detection is qualified.
ESC working condition measurement is carried out on the diesel engine machine frame that discharge capacity is 8.6 liters, low temperature urea for vehicle of the invention is molten
Liquid is under specified discharge rate, after SCR postprocessor is handled, NOXDischarge can reach the requirement of state 4, use cleaning one in 1~1.5 year
It is secondary.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and what is described in the above embodiment and the description is only the present invention
Principle, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these variation and
Improvement is both fallen in the range of claimed invention.The present invention claims protection scope by appended claims and its
Equivalent defines.
Claims (7)
1. the urea for vehicle that one kind will not crystallize, which is characterized in that be made of the raw material of following parts by weight: urea 25~35
Part, 60~80 parts of ammonium formate, 40~60 parts of deionized water.
2. the urea for vehicle that will not be crystallized as described in claim 1, which is characterized in that be made of the raw material of following parts by weight
: 28~32 parts of urea, 65~75 parts of ammonium formate, 45~55 parts of deionized water.
3. the urea for vehicle that will not be crystallized as described in claim 1, which is characterized in that be made of the raw material of following parts by weight
: 30 parts of urea, 70 parts of ammonium formate, 50 parts of deionized water.
4. the urea for vehicle that will not be crystallized as described in claim 1, it is characterised in that: the ammonium formate is by drawing into formic acid
Enter ammonia, obtains the ammonium formate that nitrogen content is 20%.
5. the urea for vehicle that will not be crystallized as described in claim 1, it is characterised in that: the urea is that mass fraction is 60-
70% high-purity urea.
6. the urea for vehicle that will not be crystallized as described in claim 1, it is characterised in that: the urea is that mass fraction is 65%
High-purity urea.
7. the preparation method of any urea for vehicle that will not be crystallized in claim 1~6, it is characterised in that: including as follows
Step: being added after ammonium formate and urea mixes into deionized water, the finished product obtained through 0.3~0.7 μm of membrane filtration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810960051.7A CN110394058A (en) | 2018-08-22 | 2018-08-22 | A kind of urea for vehicle and preparation method thereof that will not be crystallized |
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| CN201810960051.7A CN110394058A (en) | 2018-08-22 | 2018-08-22 | A kind of urea for vehicle and preparation method thereof that will not be crystallized |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879130A (en) * | 2021-03-29 | 2021-06-01 | 长春盛恒环保科技有限公司 | Novel automobile exhaust purification treatment liquid and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213125A (en) * | 2011-05-24 | 2011-10-12 | 辽宁润迪精细化工有限公司 | Urea reducing agent composition with improved low-temperature performance |
| CN102895874A (en) * | 2011-07-29 | 2013-01-30 | 迪尔公司 | Diesel exhaust fluid formulation having a high ammonium content and a low freezing point |
| CN104289106A (en) * | 2014-09-23 | 2015-01-21 | 河南弘康环保科技有限公司 | Method for preparing vehicle urea solution |
| CN104607041B (en) * | 2014-11-28 | 2018-02-09 | 河南弘康环保科技有限公司 | A kind of ultralow temperature urea for vehicle solution |
-
2018
- 2018-08-22 CN CN201810960051.7A patent/CN110394058A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213125A (en) * | 2011-05-24 | 2011-10-12 | 辽宁润迪精细化工有限公司 | Urea reducing agent composition with improved low-temperature performance |
| CN102895874A (en) * | 2011-07-29 | 2013-01-30 | 迪尔公司 | Diesel exhaust fluid formulation having a high ammonium content and a low freezing point |
| CN104289106A (en) * | 2014-09-23 | 2015-01-21 | 河南弘康环保科技有限公司 | Method for preparing vehicle urea solution |
| CN104607041B (en) * | 2014-11-28 | 2018-02-09 | 河南弘康环保科技有限公司 | A kind of ultralow temperature urea for vehicle solution |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879130A (en) * | 2021-03-29 | 2021-06-01 | 长春盛恒环保科技有限公司 | Novel automobile exhaust purification treatment liquid and preparation method thereof |
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