CN104258730A - Preparation method of automobile urea solution - Google Patents
Preparation method of automobile urea solution Download PDFInfo
- Publication number
- CN104258730A CN104258730A CN201410407490.7A CN201410407490A CN104258730A CN 104258730 A CN104258730 A CN 104258730A CN 201410407490 A CN201410407490 A CN 201410407490A CN 104258730 A CN104258730 A CN 104258730A
- Authority
- CN
- China
- Prior art keywords
- urea
- preparation
- urea liquid
- urea solution
- aldehyde
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to a preparation method of an automobile urea solution. The method comprises the following steps: (1) selecting agricultural grade urea and pure water serving as raw materials, and preparing the raw materials into a urea solution; (2) purifying the urea solution prepared in the step (1) through a filter; (3) adding an aldehyde treatment agent into the urea solution obtained in the step (2) to lower the aldehyde content of the urea solution; and (4) loading the urea solution obtained in the step (3) through an ion exchange resin column, and removing metal ions and other impurities from the urea solution to obtain the urea solution which meets automobile use requirements. The preparation method disclosed by the invention is simple and easy to implement, and has high technical adaptability and high raw material yield. The obtained urea solution has low impurity content and good development and application values.
Description
Technical field
The present invention relates to a kind of preparation method of catalytic reducer, particularly relate to a kind of preparation method of urea for vehicle solution.
Background technology
Urea for vehicle is high purity urea solution that grew up in recent years, that be applicable to SCR system (selective catalytic reduction system operating).Under high temperature (more than 300 DEG C) condition, first urea liquid is decomposed into ammonia, then under the effect of extraordinary catalyst, nitrogen oxide generation redox reaction in ammonia and exhaust gas from diesel vehicle, produce nitrogen and water, thus make the discharge capacity of nitrogen oxide reach the even higher discharge standard of state IV.
The raw materials for production of urea for vehicle are common urea and ultra-pure water.But agricultural urea inevitably introduces the impurity such as metal ion, aldehyde, insoluble matter, biuret in production and packaging process, and these impurity not only can cause the catalysqt deactivation of SCR system, also can blocking pipe and catalyst backbone.Therefore, how purifying urea liquid is to meet automobile-used technical requirement, is the unavoidable problem of research worker in the industry.
Publication number is that the Chinese patent of CN102442928A discloses employing three sections of crystallisation purification urea, and then is mixed to get the method for urea for vehicle solution with high purity water.But first degree crystalline temperatures as high more than 75 DEG C in the method, at such a temperature, in urea liquid, meeting forming section biuret, is therefore unfavorable for subsequent operation.Publication number is that the Chinese patent of CN202036819U adopts level Four ion exchange resin exchange column to carry out purification process to certain density urea liquid.Though the method can realize the purifying of urea liquid preferably and yield is higher, equipment investment is higher.Publication number be the TaiWan, China patent of TW201121929A1 have employed heating removal of impurities, dissolving, filtration, ion-exchange technology path obtain high-purity technical level urea liquid, the method impurity-eliminating effect is better, but power consumption is higher.Publication number be the Chinese patent of CN1010811065A also use dissolving, filtration, ion-exchange, dilution technology path obtain urea for vehicle solution, product yield is higher, owing to adopting 3-4 level continuous filter unit, the investment of this operation is higher, and cannot remove the aldehyde type impurities in urea.Publication number is that the Chinese patent of CN101695669A has continued to use recrystallization method, adopt that pure water mix with urea, charcoal absorption, crystallisation by cooling, dissolution of crystals also filtration technology path obtain urea for vehicle solution.Although the removal of impurity of the method is higher, raw material urea yield is on the low side.
Summary of the invention
For simplifying operating process, the applicability that develops skill, raising raw material output capacity prepared by urea for vehicle solution, obtain higher product purity, the invention provides a kind of preparation method of urea for vehicle solution, it comprises the following steps simultaneously:
(1) select agricultural grade urea and pure water to be raw material, be mixed with urea liquid;
(2) urea liquid that step (1) is prepared is carried out removal of impurities by filter;
(3) aldehyde inorganic agent is added to reduce the aldehyde of described urea liquid in the urea liquid obtained to step (2);
(4) urea liquid step (3) obtained, by ion exchange resin column, is removed the metal ion in described urea liquid and other impurity, must be met the urea liquid of automobile-used requirement.
The preferred certified products of agricultural grade urea in step (1) and the agricultural urea of Grade A.
The preferred deionization pure water of pure water in step (1), described pure resistivity of water is preferably 16M more than Ω cm, more preferably 18M more than Ω cm.
In step (1), the concentration of urea liquid is preferably 30-35 quality %, more preferably 32-35 quality %.
Filter process described in step (2) is that single-stage is filtered, and the filter core aperture of filter is preferably 30-50 μm.
In step (3), aldehyde inorganic agent is clean type oxidants hydrogen peroxide, both by reaction removing aldehydes, do not affect urea liquid quality again, addition is preferably more than 5% of described urea solution mass, and the action time of aldehyde inorganic agent and urea liquid is preferably more than 30min.
Ion exchange resin column in step (4) is preferably secondary exchange column, adopts the mode that anion and cation exchange resin combines, and preferably filter core aperture, bottom is 4-15 μm.Also hybrid resin exchange column can be selected according to the kind of impurity and content.
Container used in above step all can adopt the materials such as stainless steel, polytetrafluoroethylene (PTFE) or lucite, and further preferred container used is lucite material, to avoid the secondary pollution of urea liquid.
Beneficial effect of the present invention is:
(1) the present invention adopts yin, yang secondary ion exchange resin column with strong points to carry out purification process to urea liquid, for the ad hoc aldehydes processing links of problem that agricultural grade urea aldehyde contenting amount is high, obtained urea for vehicle solution purity is high, its impurity content can be reduced to below 20ppm, and meets associated specifications;
(2) whole process of the present invention is carried out all at normal temperatures, compared with multistage crystallization method, not only avoid the generation of biuret in urea liquid under hot conditions, also improves the yield of raw material urea to a great extent;
(3) whole system of the present invention simply and easily realize, and compared with level Four ion-exchange resin, simplifies urea liquid purifying procedure, has the clear superiority that equipment is simple, capital construction cost is low;
(4) the present invention adopts clean type oxidizer treatment aldehydes, as compared to other methods for the treatment of aldehydes such as heating, edman degradation Edman and absorption methods, have that effect is fast, efficiency is high, the feature of energy-conserving and environment-protective, aldehyde can be reduced within a short period of time extremely low, not affect again the content of other impurity and the resistance to overturning of solution;
(5) owing to adopting self-produced agricultural urea, the present invention has clear superiority in raw material supply and cost.
Detailed description of the invention
Embodiment 1
Employing resistivity is the pure water of 18.25M Ω cm, agricultural certified products urea is mixed with the urea liquid of 32.5% (mass fraction), its Biuret Content is 0.43%, aldehyde content is 14.64mg/kg, filter, then 1.16% aldehyde inorganic agent (in solution quality) is added, effect 20min, finally by the moon, sun secondary ion exchange resin column carries out purification process, solution discharge rate is about 2ml/min, in the collection liquid obtained, Biuret Content 0.03%, aldehyde content 4.71mg/kg, content of impurities is at below 19ppm, and meet the requirement of urea for vehicle solution technique.
Embodiment 2
Employing resistivity is the pure water of 18.25M Ω cm, agricultural certified products urea is mixed with the urea liquid of 35% (mass fraction), its Biuret Content is 0.47%, aldehyde content is 15.11mg/kg, filter, then 2.13% aldehyde inorganic agent (in solution quality) is added, effect 20min, finally by the moon, sun secondary ion exchange resin column carries out purification process, solution discharge rate is about 2ml/min, in the collection liquid obtained, Biuret Content 0.02%, aldehyde content 1.54mg/kg, content of impurities is at below 17ppm, and meet the requirement of urea for vehicle solution technique.
Embodiment 3
Employing resistivity is the pure water of 18.25M Ω cm, agricultural certified products urea is mixed with the urea liquid of 35% (mass fraction), its Biuret Content is 0.41%, aldehyde content is 14.51mg/kg, filter, then 3.82% aldehyde inorganic agent (in solution quality) is added, effect 10min, finally by the moon, sun secondary ion exchange resin column carries out purification process, solution discharge rate is about 2ml/min, in the collection liquid obtained, Biuret Content 0.02%, aldehyde content 0.84mg/kg, content of impurities is at below 16ppm, and meet the requirement of urea for vehicle solution technique.
Claims (8)
1. a preparation method for urea for vehicle solution, it comprises the following steps:
(1) select agricultural grade urea and pure water to be raw material, be mixed with urea liquid;
(2) urea liquid that step (1) is prepared is carried out removal of impurities by filter;
(3) aldehyde inorganic agent is added to reduce the aldehyde of described urea liquid in the urea liquid obtained to step (2);
(4) urea liquid step (3) obtained, by ion exchange resin column, is removed the metal ion in described urea liquid and other impurity, must be met the urea liquid of automobile-used requirement.
2. preparation method according to claim 1, it is characterized in that, in step (3), described aldehyde inorganic agent is clean type oxidants hydrogen peroxide, its addition is no more than 5% of described urea solution mass, and the action time of described aldehyde inorganic agent and described urea liquid is no more than 30min.
3. preparation method according to claim 1 and 2, it is characterized in that, in step (1), described agricultural grade urea is selected from certified products and the agricultural urea of Grade A, described pure resistivity of water is 16M more than Ω cm, and the concentration of described urea liquid is 30-35 quality %.
4. preparation method according to claim 3, is characterized in that, described pure resistivity of water is 18M more than Ω cm, and the concentration of described urea liquid is 32-35 quality %.
5. preparation method according to claim 1 and 2, is characterized in that, in step (2), described filter process is that single-stage is filtered, and the filter core aperture of filter is 30-50 μm.
6. preparation method according to claim 1 and 2, is characterized in that, in step (4), described ion exchange resin column is the secondary exchange column comprising yin, yang two kinds of ion exchange resin, and filter core aperture, bottom is 4-15 μm.
7. preparation method according to claim 1 and 2, is characterized in that, the container adopted in whole preparation process is stainless steel, polytetrafluoroethylene (PTFE) or lucite material.
8. preparation method according to claim 7, is characterized in that, the container adopted in whole preparation process is lucite material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410407490.7A CN104258730A (en) | 2014-08-15 | 2014-08-15 | Preparation method of automobile urea solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410407490.7A CN104258730A (en) | 2014-08-15 | 2014-08-15 | Preparation method of automobile urea solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104258730A true CN104258730A (en) | 2015-01-07 |
Family
ID=52150378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410407490.7A Pending CN104258730A (en) | 2014-08-15 | 2014-08-15 | Preparation method of automobile urea solution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104258730A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772040A (en) * | 2015-03-19 | 2015-07-15 | 张山 | Vehicle urea liquid formula |
| CN105797584A (en) * | 2016-03-29 | 2016-07-27 | 河北鑫达润滑油科技有限公司 | Production method of vehicle-used urea solution |
| CN107417577A (en) * | 2016-05-24 | 2017-12-01 | 山东新蓝环保科技有限公司 | The method and device of biuret is removed in urea for vehicle |
| CN109731487A (en) * | 2019-01-22 | 2019-05-10 | 河南弘康环保科技有限公司 | A kind of preparation method of urea for vehicle solution |
| CN110357284A (en) * | 2019-06-27 | 2019-10-22 | 福建中源新能源股份有限公司 | Preparation method and application of marine urea solution |
| CN110357283A (en) * | 2019-06-27 | 2019-10-22 | 福建中源新能源股份有限公司 | Preparation method and application of urea solution for vehicles |
| CN111111441A (en) * | 2019-12-12 | 2020-05-08 | 扬州蔚兰环保科技有限公司 | Production method of high-purity urea solution for vehicles |
| CN112844084A (en) * | 2021-01-08 | 2021-05-28 | 江苏艾德露环保科技有限公司 | Preparation method and preparation system of urea for vehicles |
| KR102428018B1 (en) * | 2021-12-07 | 2022-08-02 | 금성이엔씨 주식회사 | High-quality Urea water manufacturing system for automobiles and its manufacturing method |
| US11525380B2 (en) | 2019-01-11 | 2022-12-13 | Cummins Emission Solutions Inc. | Aftertreatment system with multiple dosing modules |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811065A (en) * | 2010-04-20 | 2010-08-25 | 江苏可兰素汽车环保科技有限公司 | Production process for tail gas catalytic reducer |
| CN202036819U (en) * | 2011-04-22 | 2011-11-16 | 北京化学试剂研究所 | Urea purification and production device |
| AU2013213700A1 (en) * | 2012-08-31 | 2014-03-20 | China Petroleum & Chemical Corporation | Apparatus for producing aqueous urea solution used in vehicles and method of using the same |
-
2014
- 2014-08-15 CN CN201410407490.7A patent/CN104258730A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811065A (en) * | 2010-04-20 | 2010-08-25 | 江苏可兰素汽车环保科技有限公司 | Production process for tail gas catalytic reducer |
| CN202036819U (en) * | 2011-04-22 | 2011-11-16 | 北京化学试剂研究所 | Urea purification and production device |
| AU2013213700A1 (en) * | 2012-08-31 | 2014-03-20 | China Petroleum & Chemical Corporation | Apparatus for producing aqueous urea solution used in vehicles and method of using the same |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772040A (en) * | 2015-03-19 | 2015-07-15 | 张山 | Vehicle urea liquid formula |
| CN105797584A (en) * | 2016-03-29 | 2016-07-27 | 河北鑫达润滑油科技有限公司 | Production method of vehicle-used urea solution |
| CN107417577A (en) * | 2016-05-24 | 2017-12-01 | 山东新蓝环保科技有限公司 | The method and device of biuret is removed in urea for vehicle |
| US11525380B2 (en) | 2019-01-11 | 2022-12-13 | Cummins Emission Solutions Inc. | Aftertreatment system with multiple dosing modules |
| CN109731487A (en) * | 2019-01-22 | 2019-05-10 | 河南弘康环保科技有限公司 | A kind of preparation method of urea for vehicle solution |
| CN110357284A (en) * | 2019-06-27 | 2019-10-22 | 福建中源新能源股份有限公司 | Preparation method and application of marine urea solution |
| CN110357283A (en) * | 2019-06-27 | 2019-10-22 | 福建中源新能源股份有限公司 | Preparation method and application of urea solution for vehicles |
| CN111111441A (en) * | 2019-12-12 | 2020-05-08 | 扬州蔚兰环保科技有限公司 | Production method of high-purity urea solution for vehicles |
| CN112844084A (en) * | 2021-01-08 | 2021-05-28 | 江苏艾德露环保科技有限公司 | Preparation method and preparation system of urea for vehicles |
| KR102428018B1 (en) * | 2021-12-07 | 2022-08-02 | 금성이엔씨 주식회사 | High-quality Urea water manufacturing system for automobiles and its manufacturing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104258730A (en) | Preparation method of automobile urea solution | |
| CN102584635B (en) | Preparation method for urea for vehicle | |
| CN104289106A (en) | Method for preparing vehicle urea solution | |
| CN102247748B (en) | Treatment method and treatment system of tail gas from glyoxylic acid production by nitric acid oxidation of glyoxal | |
| CN104557617B (en) | Diesel exhaust fluid production method | |
| CN102105408A (en) | Process and equipment for the treatment of water containing organic matter | |
| CN105797584A (en) | Production method of vehicle-used urea solution | |
| CN103012160A (en) | Preparation method of o-phenylenediamine | |
| CN113023840B (en) | Method and reaction device for degrading organic wastewater | |
| CN109179392A (en) | A kind of technique of improved chemical method production graphene | |
| CN102423601B (en) | Tail gas treatment device for cyclohexane oxidation system and treatment method thereof | |
| CN102442928B (en) | Purification method for urea | |
| CN102009957A (en) | Method for purifying high-yield superclean high-purity hydrofluoric acid | |
| CN106809871B (en) | A kind of preparation method of indium oxide nano powder | |
| CN105417497A (en) | Production device and technology for high-concentration steady chlorine dioxide solution | |
| CN110357283A (en) | Preparation method and application of urea solution for vehicles | |
| CN110577192B (en) | Preparation device and method of high-purity chlorine dioxide solution | |
| CN105582810B (en) | A kind of preparation method and system of high-purity urea for vehicle solution | |
| CN105060249A (en) | Method for preparing refined hydrochloric acid by using tail gas hydrogen chloride produced in chloroacetic acid production | |
| CN112569768A (en) | Yellow phosphorus tail gas purification and absorption method | |
| CN108033433B (en) | Industrial waste acid treatment system | |
| CN208454508U (en) | A kind of Ultraclean high-purity ammonium fluoride liquor preparation device | |
| CN205222689U (en) | Apparatus for producing of high concentration chlorine dioxide stable state liquid | |
| CN218357927U (en) | Biurea production and recovery system | |
| CN214734513U (en) | Environment-friendly chlorine dioxide pure liquid preparation facilities |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150107 |
|
| RJ01 | Rejection of invention patent application after publication |