CN106621867A - A preparing method of a urea solution used for vehicles - Google Patents
A preparing method of a urea solution used for vehicles Download PDFInfo
- Publication number
- CN106621867A CN106621867A CN201510731746.4A CN201510731746A CN106621867A CN 106621867 A CN106621867 A CN 106621867A CN 201510731746 A CN201510731746 A CN 201510731746A CN 106621867 A CN106621867 A CN 106621867A
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- CN
- China
- Prior art keywords
- urea
- water
- vehicle solution
- urea solution
- purity water
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- 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.)
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- 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
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a crystallizing method of a urea solution and particularly relates to a producing method of urea that is a raw material of a diesel vehicle exhaust treating liquid. The method includes (1) a step of preparing urea, namely a step of conveying a urea synthesis reaction solution in a synthesis stage of a urea production device into a urea solution tank to obtain an initial urea solution, (2) a step of removing excessive ammonium and carbon dioxide from the initial urea solution through flash evaporation, (3) a step of conveying the urea synthesis reaction solution into a vacuum flash evaporation crystallization kettle and performing vacuum flash evaporation crystallization, (4) a step of preparing high-purity water, namely a step of desalting industrial water, filtering the water with activated carbon, removing macro-molecule substances through a reverse osmosis membrane apparatus, removing TOC, deoxygenizing the water, disinfecting the water and filtering the water, and (5) a step of mixing crystallized urea and the high-purity water, and fully stirring the crystallized urea and the high-purity water to obtain the urea solution used for vehicles. The urea solution used for vehicles can reduce environment pollution, saves a cost and is of great significance for environment protection.
Description
Technical field
The present invention relates to the method for crystallising of urea liquid, more particularly to a kind of life as exhaust gas from diesel vehicle treatment fluid raw material carbamide
Product method.
Background technology
Exhaust gas from diesel vehicle treatment fluid is to coordinate SCR technology, is harmless nitrogen and water by the conversion of nitrogen oxides in motor exhaust
Reducing agent, the primary raw material of exhaust gas from diesel vehicle treatment fluid is urea for vehicle and water, urea for vehicle be not common agricultural carbamide or
Industrial urea, nor chemical analysis reagent, but it is a kind of with certain added value, can large-scale industrial production special chemistry
Product.
Urea for vehicle solution is strict to Control of Impurities, as ordinary tap water contains other trace element such as inorganic salt, chloride,
Therefore can not be used directly to prepare urea for vehicle solution, it is necessary to which reaching requirement through process could be used for urea liquid preparation, in car
It is crucial step with the purification of carbamide and water process in the preparation process of carbamide.Urea for vehicle, it is more typical in Chinese market
Production technology, is that, with commercial urea as raw material, Jing is filtered, and crystallization carries out urea production, and subject matter is small scale, place
The pollution that reason is produced is not concentrated, and devil liquor recovery is using difficult.
The content of the invention
In order to solve the above problems, the invention provides a kind of urea for vehicle solution with low cost, efficient.
Technical scheme is as follows：
A kind of preparation method of urea for vehicle solution, comprises the following steps：
(1), carbamide is produced：Fetch from the urea synthesis reaction liquid of urea plant synthesis phase and send in urine tank, obtain
Initial urea liquid；
(2) initial urea liquid is removed into unnecessary ammonium and carbon dioxide by flash evaporation,；
(3) the urea synthesis reaction liquid is sent into into vacuum flashing crystallization kettle, vacuum flashing crystallization is carried out；
(4), high purity water is produced：By water for industrial use desalting processing, filtered with activated carbon, big point is removed by reverse osmosis membrane apparatus
Sub- material, removes TOC, deoxidation, disinfection, filtration treatment.
(5), crystallization urea and high purity water are mixed, is stirred, is obtained final product urea for vehicle solution.
Further, the weight ratio of above-mentioned urea for vehicle solution manufacturing method, carbamide and high purity water is 0.516, ammonia and titanium dioxide
The ratio of carbon is 1:5.5, water for industrial use desalination adopts continuous electrolysis method, reverse osmosis membrane to adopt ultrafilter membrane group, disinfection to adopt
Sterilized with ultraviolet radiation disinfection.
Beneficial effects of the present invention：
Compared with prior art, the urea for vehicle solution that the present invention is provided, is removed using the simultaneously Jing flash distillations of not concentrated, pelletize residual
High-temperature high concentration urea solution after remaining ammonia and CO2 is raw material, without the need for external heat source, is used directly to produce urea for vehicle solution,
The costs such as carbamide granulation, solid urea transport, raw produce quality purchasing control are reduced, environmental pollution is reduced, using industry
With water as the raw material of high purity water, water resource is saved, solve the process problem of water for industrial use, in the feelings of global resources crisis
Under condition, it is significant.
Specific embodiment
Embodiment 1
A kind of preparation method of urea for vehicle solution, comprises the following steps：
(1), carbamide is produced：Fetch from the urea synthesis reaction liquid of urea plant synthesis phase and send in urine tank, obtain
Initial urea liquid；
(2) initial urea liquid is removed into unnecessary ammonium and carbon dioxide by flash evaporation,；
(3) the urea synthesis reaction liquid is sent into into vacuum flashing crystallization kettle, vacuum flashing crystallization is carried out；
(4), high purity water is produced：By water for industrial use desalting processing, filtered with activated carbon, big point is removed by reverse osmosis membrane apparatus
Sub- material, removes TOC, deoxidation, disinfection, filtration treatment.
(5), crystallization urea and high purity water are mixed, is stirred, is obtained final product urea for vehicle solution.
Further, the weight ratio of above-mentioned urea for vehicle solution manufacturing method, carbamide and high purity water is 0.516, ammonia and titanium dioxide
The ratio of carbon is 1:5.5, water for industrial use desalination adopts continuous electrolysis method, reverse osmosis membrane to adopt ultrafilter membrane group, disinfection to adopt
Sterilized with ultraviolet radiation disinfection.
Claims (6)
1. a kind of preparation method of urea for vehicle solution, it is characterised in that manufacture method is comprised the following steps：
(1), carbamide is produced：Fetch from the urea synthesis reaction liquid of urea plant synthesis phase and send in urine tank, obtain
To initial urea liquid；
(2) initial urea liquid is removed into unnecessary ammonium and carbon dioxide by flash evaporation,；
(3) the urea synthesis reaction liquid is sent into into vacuum flashing crystallization kettle, vacuum flashing crystallization is carried out；
(4), high purity water is produced：By water for industrial use desalting processing, filtered with activated carbon, big point is removed by reverse osmosis membrane apparatus
Sub- material, removes TOC, deoxidation, disinfection, filtration treatment.
(5), crystallization urea and high purity water are mixed, is stirred, is obtained final product urea for vehicle solution.
2. as claimed in claim 1, a kind of urea for vehicle solution manufacturing method, it is characterised in that the carbamide and high purity water
Weight ratio is 0.516.
3. a kind of as claimed in claim 1, urea for vehicle solution manufacturing method, it is characterised in that the ammonia and carbon dioxide
Ratio be 1:5.5.
4. as claimed in claim 1, a kind of urea for vehicle solution manufacturing method, it is characterised in that water for industrial use desalination is using company
Continuous electrolytic method.
5. a kind of as claimed in claim 1, urea for vehicle solution manufacturing method, it is characterised in that reverse osmosis membrane adopts ultrafilter membrane
Group.
6. as claimed in claim 1, a kind of urea for vehicle solution manufacturing method, it is characterised in that disinfection is shone using ultraviolet
Penetrate disinfection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510731746.4A CN106621867A (en) | 2015-10-30 | 2015-10-30 | A preparing method of a urea solution used for vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510731746.4A CN106621867A (en) | 2015-10-30 | 2015-10-30 | A preparing method of a urea solution used for vehicles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106621867A true CN106621867A (en) | 2017-05-10 |
Family
ID=58809530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510731746.4A Pending CN106621867A (en) | 2015-10-30 | 2015-10-30 | A preparing method of a urea solution used for vehicles |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106621867A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110575751A (en) * | 2018-06-11 | 2019-12-17 | 河南车权健新能源科技有限公司 | automobile urea reagent and preparation method thereof |
| CN112094207A (en) * | 2020-09-30 | 2020-12-18 | 河南弘康环保科技有限公司 | Preparation method of low-formaldehyde automobile urea solution |
-
2015
- 2015-10-30 CN CN201510731746.4A patent/CN106621867A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110575751A (en) * | 2018-06-11 | 2019-12-17 | 河南车权健新能源科技有限公司 | automobile urea reagent and preparation method thereof |
| CN112094207A (en) * | 2020-09-30 | 2020-12-18 | 河南弘康环保科技有限公司 | Preparation method of low-formaldehyde automobile urea solution |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170510 |
|
| WD01 | Invention patent application deemed withdrawn after publication |