CN107320994A - A kind of crystallization apparatus for being used to produce urea - Google Patents
A kind of crystallization apparatus for being used to produce urea Download PDFInfo
- Publication number
- CN107320994A CN107320994A CN201710484677.0A CN201710484677A CN107320994A CN 107320994 A CN107320994 A CN 107320994A CN 201710484677 A CN201710484677 A CN 201710484677A CN 107320994 A CN107320994 A CN 107320994A
- Authority
- CN
- China
- Prior art keywords
- crystallization
- cylinder
- kettle
- tank
- urea
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0004—Crystallisation cooling by heat exchange
- B01D9/0013—Crystallisation cooling by heat exchange by indirect heat exchange
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D2009/0086—Processes or apparatus therefor
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a kind of crystallization apparatus for being used to produce urea, including urine synthesis tank, pre-crystallized kettle, crystallization kettle, vavuum pump and surge tank；Described urine synthesis tank, pre-crystallized kettle and crystallization kettle is sequentially connected by pipeline；Described surge tank is connected to the top of crystallization kettle in turn with vavuum pump；The outlet of described crystallization kettle is provided with circulation pipe, and circulation pipe is connected to urine synthesis tank.Compared with prior art, beneficial effects of the present invention are：Directly obtained urea synthesis solution is reacted in use urine synthesis tank to be crystallized, make use of the characteristics of temperature of urea synthesis solution is high, reduce the generation of biuret；And in vacuum environment, high-temperature water in urea synthesis solution can rapid vaporization, therefore have part water and be evaporated from urea synthesis solution, improve the concentration of urea synthesis solution, it is ensured that the quality of product.
Description
Technical field
The present invention relates to chemical field, particularly a kind of crystallization apparatus for being used to produce urea.
Background technology
According to the regulation of national environmental protection department, the heavy-duty diesel vehicle of sale was intended to reach the row of state IV from 1 day July in 2013
Standard is put, compared with state Ⅲ emission standard, the discharge discharged nitrous oxides of state IV of heavy-duty diesel oil automobile reduce 30% or so,
Grain thing（PM）Discharge reduces more than 80%.In order to reduce nitrogen oxides and particulate matter in exhaust gas from diesel vehicle discharge.At present, Europe
The car manufactures of the country such as U.S. generally use SCR（SCR）Technical finesse exhaust gas from diesel vehicle, makes up to Europe
Vth, the discharge standard of the even more high of Europe VI.
Exhaust gas from diesel vehicle treatment fluid is to coordinate SCR technology, is harmless nitrogen by the conversion of nitrogen oxides in motor exhaust
The reducing agent of gas and water, the primary raw material of exhaust gas from diesel vehicle treatment fluid is urea for vehicle and water, and urea for vehicle is not common agriculture
Industry urea or industrial urea, nor chemical analysis reagent, but it is a kind of there is certain added value, can large-scale industrial production
Specialty chemicals.Urea for vehicle operation principle is that urea for vehicle is added to SCR system, in hot environment（Temperature is higher than 300
℃）, urea resolves into ammonia, along with the effect of catalyst, and the nitrogen oxides in tail gas can generate nitrogen with ammonia reaction rapidly
Gas and water.The delivery temperature of diesel engine is generally 300-500 DEG C, meets the heat required for nitrogen oxides reduction.
At present, to be that ammonia and carbon dioxide react generation urea synthesizing under certain condition anti-for the main flow of urea production
Liquid is answered, urea synthesis reaction liquid obtains solid urea by processes such as flush distillation, double evaporation-cooling, granulations again.However, automobile-used urine
The purity requirement of element is very high, and commercially available industrial or agriculture urea granules are higher due to the magazine content such as biuret, can not be direct
For preparing urea for vehicle solution, it is necessary to which it is miscellaneous to reduce the biuret in urea etc. by repeatedly crystallizing to make urea synthesis reaction liquid
Matter content.
The content of the invention
Simple it is an object of the invention to provide a kind of equipment, floor space is small, improve urea purification efficiency be used for give birth to
Produce the crystallization apparatus of urea.
To achieve these goals, the technical scheme that provides of the present invention is：A kind of crystallization apparatus for being used to produce urea, bag
Include urine synthesis tank, pre-crystallized kettle, crystallization kettle, vavuum pump and surge tank；Described urine synthesis tank, pre-crystallized kettle and crystallization kettle
It is sequentially connected by pipeline；Described surge tank is connected to the top of crystallization kettle in turn with vavuum pump；Described crystallization kettle goes out
Mouth is provided with circulation pipe, and circulation pipe is connected to urine synthesis tank.
Preferably, the crystallization kettle includes crystallization cylinder, precipitation cylinder, dividing plate, through hole, chuck, chilled water import, chilled water
Outlet, temperature sensor, charging aperture, discharge nozzle, agitator, blade, freezing water tank, described crystallization cylinder be welded by steel plate and
Into；Described precipitation cylinder is connected with crystallizing the lower end of cylinder, and coaxial with crystallization cylinder；Described temperature sensor is in crystallization cylinder upper half
Part, controls the turnover of chilled water；Described dividing plate separates crystallization cylinder and precipitation cylinder in precipitation cylinder and crystallization cylinder junction,
The flow field of crystallization cylinder and the flow field of precipitation cylinder is set to be independent of each other；Described through hole is located on dividing plate, via design for it is suitable for reading it is big under
Mouth is small；The temperature signal measured by temperature sensor is converted to electric signal, passes to freezing water tank, controls the turnover of chilled water
Amount, so as to control to crystallize temperature in the kettle, reaches stable crystallization operating mode, crystal enters precipitation cylinder by dividing plate, in precipitation cylinder
Continue to precipitate, the crystal precipitated takes out from discharge nozzle.
Compared with prior art, beneficial effects of the present invention are：Directly use in urine synthesis tank and react obtained urea
Synthesis liquid is crystallized, and make use of the characteristics of temperature of urea synthesis solution is high, reduces the generation of biuret；And in vacuum environment
In, high-temperature water in urea synthesis solution can rapid vaporization, therefore have part water and be evaporated from urea synthesis solution, improve
The concentration of urea synthesis solution, it is ensured that the quality of product.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Description of reference numerals：
1- urine synthesis tanks, the pre-crystallized kettles of 2-, 3- crystallization kettles, 4- vavuum pumps, 5- surge tanks, 6- circulation pipes, 7- crystallization cylinders, 8- sinks
Shallow lake cylinder, 9- dividing plates, 10- through holes, 11- chucks, 12- chilled water imports, 13- chilled water outlets, 14- temperature sensors, 15- chargings
Mouthful, 16- discharge nozzles, 17- agitators, 18- blades, 19- freezing water tanks.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
Referring to Fig. 1, The embodiment provides a kind of crystallization apparatus for being used to produce urea, including urine synthesis
Tank 1, pre-crystallized kettle 2, crystallization kettle 3, vavuum pump 4 and surge tank 5；Described urine synthesis tank 1, pre-crystallized kettle 2 and crystallization kettle 3 is logical
Piping is sequentially connected；Described surge tank 5 is connected to the top of crystallization kettle 3 in turn with vavuum pump 4；Described crystallization kettle 3
Outlet is provided with circulation pipe 6, and circulation pipe 6 is connected to urine synthesis tank 1.
Obtained urea synthesis solution is reacted in directly use urine synthesis tank 1 of the invention to be crystallized, and make use of urea to close
Into liquid temperature it is high the characteristics of, reduce the generation of biuret；And in vacuum environment, the high-temperature water in urea synthesis solution can be fast
Speed vaporization, therefore have part water and be evaporated from urea synthesis solution, improve the concentration of urea synthesis solution, it is ensured that product
Quality.
The present invention is provided with pre-crystallized kettle 2, and provided with the chuck 11 for being connected with thermal medium on the pre-crystallized outer wall of kettle 2, it is ensured that
The temperature of urea synthesis solution, especially improves the temperature of the urea synthesis solution reacted again, and being conducive to entering can in crystallization kettle 3
Rapid gasification, it is ensured that product quality, improves the productivity ratio of product.
The bottom of the crystallization kettle 3 of the present invention is back taper, effectively can prevent crystal from accumulating in bottom, be conducive to going out completely
Material, improves the yield of product, while being easy to clean crystallization kettle 3.
As the optimal technical scheme of the present embodiment, the crystallization kettle 3 includes crystallization cylinder 7, precipitation cylinder 8, dividing plate 9, through hole
10th, chuck 11, chilled water import 12, chilled water outlet 13, temperature sensor 14, charging aperture 15, discharge nozzle 16, agitator 17,
Blade 18, freezing water tank 19, described crystallization cylinder 7 are formed by steel plate is coiling welded；The lower end of described precipitation cylinder 8 and crystallization cylinder 7
Connection, and it is coaxial with crystallization cylinder 7；Described temperature sensor 14 controls the turnover of chilled water in the crystallization top half of cylinder 7；Institute
The dividing plate 9 stated will crystallize cylinder 7 and precipitation cylinder 8 is separated in precipitation cylinder 8 and crystallization cylinder 7 junction, make the flow field of crystallization cylinder 7 and sink
The flow field of shallow lake cylinder 8 is independent of each other；Described through hole 10 is located on dividing plate 9, and it is small that through hole 10 is designed as big lower mouth suitable for reading；Passed by temperature
The temperature signal that sensor 14 is measured is converted to electric signal, passes to freezing water tank, controls the output of chilled water, so as to control knot
Temperature in brilliant kettle 3, reaches stable crystallization operating mode, and crystal enters precipitation cylinder 8 by dividing plate 9, continues to precipitate in precipitation cylinder 8,
The crystal precipitated takes out from discharge nozzle 16.
The change of temperature in crystallization cylinder 7 can be detected in real time, automatically controlling for chilled water is realized, so as to improve work
Efficiency, reduces running cost；Reduce crystal from overfall flow out and the product of generation waste；Regulation performance is good, operation is steady
It is fixed, it is simple in construction, it is easily manufactured.
Construction, feature and the action effect of the present invention, above institute is described in detail according to the embodiment shown in schema above
Only presently preferred embodiments of the present invention is stated, but the present invention is not to limit practical range shown in drawing, it is every according to structure of the invention
Want made change, or be revised as the equivalent embodiment of equivalent variations, still without departing from specification with illustrating during covered spirit,
All should be within the scope of the present invention.
Claims (2)
1. a kind of crystallization apparatus for being used to produce urea, it is characterised in that：Including urine synthesis tank, pre-crystallized kettle, crystallization kettle, true
Empty pump and surge tank；Described urine synthesis tank, pre-crystallized kettle and crystallization kettle is sequentially connected by pipeline；Described surge tank with
Vavuum pump is connected to the top of crystallization kettle in turn；The outlet of described crystallization kettle is provided with circulation pipe, and circulation pipe is connected to urine conjunction
Into tank.
2. the crystallization apparatus according to claim 1 for being used to produce urea, it is characterised in that：The crystallization kettle includes crystallization
Cylinder, precipitation cylinder, dividing plate, through hole, chuck, chilled water import, chilled water outlet, temperature sensor, charging aperture, discharge nozzle, stirring
Device, blade, freezing water tank, described crystallization cylinder are formed by steel plate is coiling welded；Described precipitation cylinder is connected with crystallizing the lower end of cylinder,
And it is coaxial with crystallization cylinder；Described temperature sensor controls the turnover of chilled water in crystallization cylinder top half；Described dividing plate exists
Precipitation cylinder and crystallization cylinder junction, crystallization cylinder and precipitation cylinder are separated, and make the mutual not shadow in the flow field in flow field and precipitation cylinder of crystallization cylinder
Ring；Described through hole is located on dividing plate, and via design is that big lower mouth suitable for reading is small；The temperature signal conversion measured by temperature sensor
For electric signal, freezing water tank is passed to, the output of chilled water is controlled, so as to control to crystallize temperature in the kettle, stable knot is reached
Brilliant operating mode, crystal enters precipitation cylinder by dividing plate, continues to precipitate in precipitation cylinder, the crystal precipitated takes out from discharge nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710484677.0A CN107320994A (en) | 2017-06-23 | 2017-06-23 | A kind of crystallization apparatus for being used to produce urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710484677.0A CN107320994A (en) | 2017-06-23 | 2017-06-23 | A kind of crystallization apparatus for being used to produce urea |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107320994A true CN107320994A (en) | 2017-11-07 |
Family
ID=60194123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710484677.0A Pending CN107320994A (en) | 2017-06-23 | 2017-06-23 | A kind of crystallization apparatus for being used to produce urea |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107320994A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH026802A (en) * | 1988-06-24 | 1990-01-11 | Ishikawajima Harima Heavy Ind Co Ltd | Reverse circulation-type crystallization device |
| CN203043608U (en) * | 2013-02-06 | 2013-07-10 | 长沙有色冶金设计研究院有限公司 | Reduced pressure evaporative crystallization device |
| CN203370315U (en) * | 2013-06-19 | 2014-01-01 | 宿迁科思化学有限公司 | Uniform stirrer |
| CN203577363U (en) * | 2013-08-24 | 2014-05-07 | 天津隆雷科技有限公司 | Automatic-control chilled water overflowing-prevention crystallization kettle |
| CN206184030U (en) * | 2016-11-17 | 2017-05-24 | 南宁市夏阳化工科技有限责任公司 | Produce automobile -used ureal vacuum crystallization device |
-
2017
- 2017-06-23 CN CN201710484677.0A patent/CN107320994A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH026802A (en) * | 1988-06-24 | 1990-01-11 | Ishikawajima Harima Heavy Ind Co Ltd | Reverse circulation-type crystallization device |
| CN203043608U (en) * | 2013-02-06 | 2013-07-10 | 长沙有色冶金设计研究院有限公司 | Reduced pressure evaporative crystallization device |
| CN203370315U (en) * | 2013-06-19 | 2014-01-01 | 宿迁科思化学有限公司 | Uniform stirrer |
| CN203577363U (en) * | 2013-08-24 | 2014-05-07 | 天津隆雷科技有限公司 | Automatic-control chilled water overflowing-prevention crystallization kettle |
| CN206184030U (en) * | 2016-11-17 | 2017-05-24 | 南宁市夏阳化工科技有限责任公司 | Produce automobile -used ureal vacuum crystallization device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102442905A (en) | Method for preparing dimethyl adipate by continuous esterification | |
| CN107930395A (en) | A kind of production technology and system that urea for vehicle solution is prepared by industrial urea | |
| CN201988366U (en) | Continuous subcritical water tube type reaction apparatus | |
| CN201543264U (en) | Air cooling crystallization tower | |
| CN107320994A (en) | A kind of crystallization apparatus for being used to produce urea | |
| CN201704239U (en) | Paraxylene oxidation crystallization device | |
| CN206184030U (en) | Produce automobile -used ureal vacuum crystallization device | |
| CN206188690U (en) | Be used for producing automobile -used ureal reaction unit | |
| CN105749577B (en) | Produce the coil pipe crystallizer of urea for vehicle | |
| CN208532649U (en) | Continuous production device for chloroacetic acid | |
| CN101704733A (en) | New hydrolysis coupling process of methyl acetate and special device thereof | |
| CN106732290A (en) | A kind of reactor of continuous production nitromethane | |
| CN105854338B (en) | Produce the tubulation crystallizer of urea for vehicle | |
| CN207025316U (en) | A kind of preparation facilities of tetrabutyl titanate | |
| CN101817744B (en) | Oxidizing and crystallizing device of paraxylene | |
| CN105884658B (en) | Prepare the process units of urea for vehicle | |
| CN213699808U (en) | P-chlorophenylhydrazine hydrochloride continuous flow reaction system | |
| CN109438199A (en) | A kind of method that continuous high-efficient oxidation prepares 2,6,6- trimethyl -2- cyclohexene -1,4- diketone | |
| CN202036987U (en) | Low-temperature reaction kettle under nitrogen protection | |
| CN105732434B (en) | The double helix production equipment of urea for vehicle | |
| CN105771305B (en) | Produce the baffle crystallization equipment of urea for vehicle | |
| CN202893333U (en) | Gas-liquid reaction device | |
| CN220159937U (en) | Hydrogen chloride gas recycling and applying device in imidazole aldehyde continuous production | |
| CN105732435B (en) | The production equipment of urea for vehicle | |
| CN102078783A (en) | Device for preparing urea-formaldehyde |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171107 |