CN219722897U - Treatment system for preparing biurea mother liquor by weak base condensation process - Google Patents
Treatment system for preparing biurea mother liquor by weak base condensation process Download PDFInfo
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- CN219722897U CN219722897U CN202321154830.0U CN202321154830U CN219722897U CN 219722897 U CN219722897 U CN 219722897U CN 202321154830 U CN202321154830 U CN 202321154830U CN 219722897 U CN219722897 U CN 219722897U
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- pipeline
- mother liquor
- tower
- hydrolysis
- desorption
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- 239000012452 mother liquor Substances 0.000 title claims abstract description 58
- 238000009833 condensation Methods 0.000 title claims abstract description 24
- 230000005494 condensation Effects 0.000 title claims abstract description 24
- ULUZGMIUTMRARO-UHFFFAOYSA-N (carbamoylamino)urea Chemical compound NC(=O)NNC(N)=O ULUZGMIUTMRARO-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000003795 desorption Methods 0.000 claims abstract description 60
- 230000007062 hydrolysis Effects 0.000 claims abstract description 45
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 45
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 19
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000004202 carbamide Substances 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 27
- 229910021529 ammonia Inorganic materials 0.000 claims description 11
- 238000011084 recovery Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 12
- 239000002585 base Substances 0.000 description 7
- 239000001569 carbon dioxide Substances 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A treatment system for preparing biurea mother liquor by weak base condensation process comprises a mother liquor tank, wherein a feed inlet of the mother liquor tank is connected with a condensation mother liquor source, a liquid outlet of the mother liquor tank is connected with a urea dissolving tank through a first pipeline, a first conveying pump is arranged on the first pipeline, the system further comprises a desorption tower, a hydrolysis tower, a second pipeline and a third pipeline, the upstream end of the second pipeline is connected to the first pipeline and is positioned at the downstream of the first conveying pump, the downstream end of the second pipeline is connected with the desorption tower through a cold medium channel of a desorption heat exchanger, the desorption tower is fed, the upstream end of the third pipeline is connected with the middle part of the desorption tower, the downstream end of the third pipeline is connected with the hydrolysis tower through a cold medium channel of a hydrolysis heat exchanger, the third pipeline is provided with a second conveying pump, and the liquid outlet of the hydrolysis tower is fed to the desorption tower through a heat medium channel of the hydrolysis heat exchanger. The method can effectively treat biurea condensed mother liquor, reduce the ammonia nitrogen content in the discharged water, and has low treatment cost.
Description
Technical Field
The utility model relates to the field of chemical industry, in particular to a treatment system for preparing biurea mother liquor by a weak base condensation process.
Background
The weak base method is used for condensation, urea and hydrazine hydrate are reacted to generate biurea, the byproduct ammonia is removed from the reaction kettle in a gas form while the biurea is generated, and is reused to the front-end hydrazine hydrate synthesis after being absorbed and purified by alkali liquor, so that the recycling of ammonia is realized, but the reaction rate is slower, in order to accelerate the reaction, the urea is in an excessive state, the mother liquor after the biurea is separated contains unreacted urea, the mother liquor is mostly reused in a urea dissolving process at present, and the product biurea impurity is increased, the color is deepened and the particle size distribution is widened after multiple cycles. Therefore, the purity of biurea is ensured by adopting the mode of discharging part of mother liquor and supplementing fresh water in the process.
However, how to efficiently treat the discharged mother liquor of the weak alkali condensation process, reduce the ammonia nitrogen content in the discharged wastewater and recover the ammonia generated by the hydrolysis of urea in the discharged wastewater is a problem to be solved by the skilled person.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a treatment system for preparing biurea mother liquor by a weak base condensation process, which can effectively treat the biurea condensation mother liquor, reduce the ammonia nitrogen content in external drainage and has low treatment cost.
The technical scheme of the utility model is as follows: a treatment system for preparing biurea mother liquor by weak base condensation process comprises a mother liquor tank, wherein a feed inlet of the mother liquor tank is connected with a condensation mother liquor source, a liquid outlet of the mother liquor tank is connected with a urea dissolving tank through a first pipeline, a first conveying pump is arranged on the first pipeline, the system further comprises a desorption tower, a hydrolysis tower, a second pipeline and a third pipeline, the upstream end of the second pipeline is connected to the first pipeline and is positioned at the downstream of the first conveying pump, the downstream end of the second pipeline is connected with the desorption tower through a cold medium channel of a desorption heat exchanger, the desorption tower is fed, the upstream end of the third pipeline is connected with the middle part of the desorption tower, the downstream end of the third pipeline is connected with the hydrolysis tower through a cold medium channel of a hydrolysis heat exchanger, the third pipeline is provided with a second conveying pump, and the liquid outlet of the hydrolysis tower is fed to the desorption tower through a heat medium channel of the hydrolysis heat exchanger.
Further, the steam exhaust port of the hydrolysis tower supplies materials to the desorption tower through a fourth pipeline, and the connection position of the fourth pipeline and the desorption tower is positioned above the upstream end of the third pipeline.
Further, the connection position of the heat medium channel of the hydrolysis heat exchanger and the desorption tower is positioned below the upstream end of the third pipeline.
Further, the bottom of the desorption tower feeds the water treatment unit through a heat medium channel of the desorption heat exchanger and a condenser.
Further, the desorption tower is a plate tower.
Further, the top of the desorption tower feeds the ammonia recovery process.
The technical scheme has the following beneficial effects:
1. the treatment system for preparing biurea mother liquor by weak base condensation process comprises a mother liquor tank, wherein a feed inlet of the mother liquor tank is connected with a condensation mother liquor source, a liquid discharge outlet of the mother liquor tank is connected with a urea dissolving tank through a first pipeline, a first conveying pump is arranged on the first pipeline, and the mother liquor after biurea is separated contains unreacted urea and flows back to the urea dissolving tank for dissolving urea to be reused as mother liquor. The device comprises a first conveying pump, a first pipeline, a second pipeline, a third pipeline, a desorption tower, a hydrolysis tower, a second pipeline and a third pipeline, wherein the upstream end of the second pipeline is connected to the first pipeline, the downstream end of the second pipeline is positioned at the downstream of the first conveying pump, the downstream end of the second pipeline is fed to the desorption tower through a cold medium channel of the desorption heat exchanger, when biurea impurities obtained through separation are increased, the color is deepened, and the particle size distribution is widened, condensed mother liquor cannot be continuously recycled (contains ammonia and urea and cannot be directly discharged outwards), and the ammonia flows from top to bottom after being preheated through the second pipeline and is stripped for recycling. The upstream end of the third pipeline is connected to the middle of the desorption tower, the downstream end of the third pipeline is fed to the hydrolysis tower through a cold medium channel of the hydrolysis heat exchanger, a second conveying pump is arranged on the third pipeline, and the condensed mother liquor after steam stripping is preheated again and then is sent to the hydrolysis tower, wherein most of urea is hydrolyzed into ammonia and carbon dioxide under higher pressure and higher temperature for recycling. The liquid outlet of the hydrolysis tower feeds the desorption tower through a heat medium channel of the hydrolysis heat exchanger, after the hydrolysis condensation mother liquor exchanges heat with the material entering the hydrolysis tower, the material enters the desorption tower, ammonia and carbon dioxide in the material are completely stripped out and recycled, so that the content of the ammonia and urea in the discharged condensation mother liquor is within a specified range, and the emission requirement (the urea content is less than 100 ppm) is met.
2. The exhaust port of the hydrolysis tower feeds the desorption tower through a fourth pipeline, the connection position of the fourth pipeline and the desorption tower is positioned above the upstream end of the third pipeline, ammonia gas and carbon dioxide generated by hydrolysis are sent to the desorption tower for uniform recycling, and the hydrolyzed vapor phase heat is utilized to strip condensed mother liquor, so that the energy consumption of the desorption tower is reduced.
3. The connection position of the heat medium channel of the hydrolysis heat exchanger and the desorption tower is positioned below the upstream end of the third pipeline, so that the hydrolyzed condensed mother liquor is prevented from flowing back to the hydrolysis tower, and the utilization efficiency of the hydrolysis tower is improved.
Further description is provided below with reference to the drawings and detailed description.
Drawings
FIG. 1 is a schematic diagram of the connection of the present utility model.
In the drawing, 1 is a mother liquor tank, 2 is a first pipeline, 3 is a first delivery pump, 4 is a desorption tower, 5 is a hydrolysis tower, 6 is a second pipeline, 7 is a third pipeline, 8 is a second delivery pump, and 9 is a fourth pipeline.
Detailed Description
Example 1
Referring to fig. 1, a treatment system for preparing biurea mother liquor by a weak base condensation process comprises a mother liquor tank 1, wherein a feed inlet of the mother liquor tank 1 is connected with a condensation mother liquor source, a liquid outlet of the mother liquor tank 1 is connected with a urea dissolving tank through a first pipeline 2, and a first conveying pump 3 is arranged on the first pipeline. Also comprises a desorption tower 4, a hydrolysis tower 5, a second pipeline 6 and a third pipeline 7. The upstream end of the second pipeline 6 is connected to the first pipeline 2 and is located downstream of the first delivery pump 3, and normally, valves are required to be respectively arranged on the first pipeline and the second pipeline to control the flow direction and the flow rate of the condensed mother liquor. The downstream end of the second pipeline is used for feeding the desorption tower 4 through a cold medium channel of the desorption heat exchanger, specifically, the downstream end of the second pipeline is connected to the top side wall of the desorption tower, the desorption tower is a plate-type tower, the tower bottom of the desorption tower 4 is used for feeding the water treatment unit through a heat medium channel of the desorption heat exchanger and a condenser, and the tower top of the desorption tower 4 is used for feeding the ammonia recovery process. The upstream end of the third pipeline 7 is connected to the middle part of the desorption tower 4, the downstream end of the third pipeline 7 is used for feeding the hydrolysis tower 5 through a cold medium channel of the hydrolysis heat exchanger, and a second conveying pump 8 is arranged on the third pipeline 7. The liquid outlet of the hydrolysis tower 5 feeds the desorption tower 4 through the heat medium channel of the hydrolysis heat exchanger, specifically, the connection position of the heat medium channel of the hydrolysis heat exchanger and the desorption tower 4 is positioned below the upstream end of the third pipeline, the vapor outlet of the hydrolysis tower 5 feeds the desorption tower 4 through the fourth pipeline 9, and the connection position of the fourth pipeline and the desorption tower is positioned above the upstream end of the third pipeline.
The working principle of the utility model is that, as the condensation reaction proceeds, when partial mother liquor is required to be discharged, the mother liquor is preheated by a desorption heat exchanger at a flow rate of 2-3t/h and then enters the top of the desorption tower, the pressure is 0.1-0.3MPa, the temperature is 120-130 ℃, stripping is carried out, ammonia gas dissolved in the mother liquor is stripped, the stripped condensed mother liquor is conveyed to a hydrolysis tower through a third pipeline, the pressure of the hydrolysis tower is 3-4MPa, the temperature is 220-240 ℃, urea in the condensed mother liquor is hydrolyzed into ammonia gas and carbon dioxide, the ammonia gas and the carbon dioxide are conveyed to the desorption tower through a fourth pipeline, the condensed mother liquor is positioned above the upstream end of the third pipeline, the stripping effect is achieved on the condensed mother liquor after the hydrolysis is conveyed to the desorption tower after passing through a heat medium channel of the hydrolysis heat exchanger, the residual carbon dioxide and the ammonia gas are stripped out, the discharged condensed mother liquor is cooled to 50 ℃, and then conveyed to a water treatment unit, the electric conductance of the waste water is less than 10us/cm < 0ppm, and the ammonia nitrogen content is less than 100ppm.
Claims (6)
1. The utility model provides a treatment system of weak base method condensation technology preparation biurea mother liquor, includes mother liquor groove (1), the feed inlet of mother liquor groove (1) is used for linking to each other with the condensation mother liquor source, and the leakage fluid dram of mother liquor groove (1) is used for linking to each other with the urea dissolving tank through first pipeline (2), sets up first delivery pump (3), its characterized in that on the first pipeline: also comprises a desorption tower (4), a hydrolysis tower (5), a second pipeline (6) and a third pipeline (7),
the upstream end of the second pipeline (6) is connected to the first pipeline (2) and is positioned at the downstream of the first delivery pump (3), the downstream end of the second pipeline passes through a cold medium channel of the desorption heat exchanger to feed the desorption tower (4),
the upstream end of the third pipeline (7) is connected with the middle part of the desorption tower (4), the downstream end of the third pipeline (7) is used for feeding the hydrolysis tower (5) through a cold medium channel of the hydrolysis heat exchanger, a second delivery pump (8) is arranged on the third pipeline (7),
the liquid outlet of the hydrolysis tower (5) feeds the desorption tower (4) through a heat medium channel of the hydrolysis heat exchanger.
2. The treatment system for preparing biurea mother liquor by weak base condensation process according to claim 1, which is characterized in that: the steam exhaust port of the hydrolysis tower (5) is used for feeding the desorption tower (4) through a fourth pipeline (9), and the connection position of the fourth pipeline and the desorption tower is positioned above the upstream end of the third pipeline.
3. The treatment system for preparing biurea mother liquor by weak base condensation process according to claim 1, which is characterized in that: the connection position of the heat medium channel of the hydrolysis heat exchanger and the desorption tower (4) is positioned below the upstream end of the third pipeline.
4. The treatment system for preparing biurea mother liquor by weak base condensation process according to claim 1, which is characterized in that: the tower bottom of the desorption tower (4) feeds the water treatment unit through a heat medium channel of the desorption heat exchanger and a condenser.
5. The treatment system for preparing biurea mother liquor by weak base condensation process according to claim 1, which is characterized in that: the desorption tower (4) is a plate tower.
6. The treatment system for preparing biurea mother liquor by weak base condensation process according to claim 1, which is characterized in that: the top of the desorption tower (4) feeds the ammonia recovery process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321154830.0U CN219722897U (en) | 2023-05-15 | 2023-05-15 | Treatment system for preparing biurea mother liquor by weak base condensation process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321154830.0U CN219722897U (en) | 2023-05-15 | 2023-05-15 | Treatment system for preparing biurea mother liquor by weak base condensation process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219722897U true CN219722897U (en) | 2023-09-22 |
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ID=88050707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321154830.0U Active CN219722897U (en) | 2023-05-15 | 2023-05-15 | Treatment system for preparing biurea mother liquor by weak base condensation process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219722897U (en) |
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2023
- 2023-05-15 CN CN202321154830.0U patent/CN219722897U/en active Active
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