CN220364366U - Hydrogen chloride recovery unit is used in PVC production - Google Patents
Hydrogen chloride recovery unit is used in PVC production Download PDFInfo
- Publication number
- CN220364366U CN220364366U CN202321979840.8U CN202321979840U CN220364366U CN 220364366 U CN220364366 U CN 220364366U CN 202321979840 U CN202321979840 U CN 202321979840U CN 220364366 U CN220364366 U CN 220364366U
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- China
- Prior art keywords
- absorption tower
- hydrogen chloride
- liquid phase
- gas
- separation tank
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229910000041 hydrogen chloride Inorganic materials 0.000 title claims abstract description 52
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000011084 recovery Methods 0.000 title claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 60
- 238000010521 absorption reaction Methods 0.000 claims abstract description 52
- 239000007791 liquid phase Substances 0.000 claims abstract description 38
- 239000012071 phase Substances 0.000 claims abstract description 31
- 238000000926 separation method Methods 0.000 claims abstract description 29
- 238000005406 washing Methods 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000007792 gaseous phase Substances 0.000 claims description 12
- 230000008676 import Effects 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 4
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 abstract description 17
- 239000002994 raw material Substances 0.000 abstract description 6
- 238000006116 polymerization reaction Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 15
- 239000002253 acid Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000011552 falling film Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The utility model relates to a hydrogen chloride recovery device for PVC production, which belongs to the technical field of chemical equipment and comprises an absorption tower, a separation tank and an alkaline washing tank, wherein a gas phase outlet and a gas phase inlet are arranged on the absorption tower, the gas phase outlet is connected with an alkaline washing tank pipeline, a heat exchange device and a heating device are arranged on the outer side of the separation tank, the gas phase inlet is connected with the heat exchange device pipeline, a liquid phase inlet and a liquid phase outlet are arranged on the absorption tower, the liquid phase inlet and the liquid phase outlet are respectively connected with the separation tank pipeline, and a pump body is arranged on a pipeline between the absorption tower and the separation tank. The absorption tower is connected with the separation tank, the liquid phase in the separation tank can be recycled, and the recovered hydrogen chloride can also be connected with a vinyl chloride polymerization production line to be used as raw material gas for vinyl chloride production.
Description
Technical Field
The utility model belongs to the technical field of chemical equipment, and particularly relates to a hydrogen chloride recovery device for PVC production.
Background
Hydrogen chloride is a colorless nonflammable gas, has extremely pungent smell, has specific gravity greater than that of air, generates white fog when meeting damp air, is extremely soluble in water to generate hydrochloric acid, has strong corrosiveness, can react with various metals to generate hydrogen, can form explosive mixture with air, and generates extremely toxic hydrogen cyanide when meeting cyanide. If the hydrogen chloride is not treated, the hydrogen chloride is directly discharged to the atmosphere, and the environment is polluted.
The existing process for treating excessive hydrogen chloride in the vinyl chloride production process is to remove excessive hydrogen chloride by an alkaline washing or acid washing method, obtain refined vinyl chloride for polymerization, wash with water, keep a certain liquid circulation amount in an alkaline washing tower to meet the purification requirement, continuously add fresh water from the water washing tower, continuously discharge waste liquid, and make acid by entering a falling film absorption system after a small amount of waste liquid flows into a sieve plate tower, and replace alkali liquor at regular time, thus leading to complex hydrogen chloride recovery process and high cost. When the hydrogen chloride treatment process is used, hydrogen chloride cannot be recycled to be used as raw material gas for synthesizing vinyl chloride, so that resource waste is caused, and therefore, the utility model provides a hydrogen chloride recycling device for PVC production, and the technical problems are solved.
Disclosure of Invention
In order to solve the technical problems, the utility model adopts the following technical scheme:
the utility model provides a PVC production is with hydrogen chloride recovery unit, includes absorption tower, knockout drum, alkaline wash jar, be provided with gaseous phase export and gaseous phase import on the absorption tower, gaseous phase export and alkaline wash jar pipe connection, the knockout drum outside is provided with heat transfer device and heating device, gaseous phase import and heat transfer device pipe connection, be provided with liquid phase import and liquid phase export on the absorption tower, liquid phase import and liquid phase export respectively with knockout drum pipe connection, be provided with the pump body on the pipeline between absorption tower and the knockout drum.
According to the above technical scheme, it is further preferable that the gas phase inlet is arranged at the bottom of the absorption tower, and the gas phase outlet is arranged at the top of the absorption tower.
Further, the separation tank is arranged below the absorption tower, the liquid phase outlet is arranged at the bottom of the absorption tower, the liquid phase inlet is arranged on the side wall of the absorption tower, and the pump body is arranged between the liquid phase inlet and the separation tank.
Further, a gas-phase recovery port is arranged on the separation tank.
Further, the heat exchange device comprises a gas phase pipeline and a liquid phase pipeline, wherein the gas phase pipeline is connected with a gas phase inlet of the absorption tower, and the liquid phase pipeline is in through connection with an inner cavity of the separation tank.
Further, an air inlet and an air outlet are arranged on the alkaline washing tank, and the air inlet and the air outlet extend to the bottom of the alkaline washing tank respectively.
Further, a cooling device is arranged at the gas phase inlet.
Further, a hydrogen chloride buffer tank is arranged on the pipeline communicated with the gas phase recovery port.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a hydrogen chloride recovery device for PVC production, wherein an absorption tower is connected with a separation tank, a liquid phase in the separation tank can be recycled, and the recovered hydrogen chloride can be connected with a vinyl chloride polymerization production line to be used as raw material gas for vinyl chloride production.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present utility model.
In the figure: 1. the device comprises an absorption tower, 2, a separation tank, 3, an alkaline washing tank, 4, a gas phase outlet, 5, a gas phase inlet, 6, a liquid phase inlet, 7, a liquid phase outlet, 8, a pump body, 9, a heating device, 10, a gas phase recovery port, 13, a gas inlet, 14, a gas outlet, 15, a cooling device, 16, a hydrogen chloride buffer tank, 17 and a heating device.
Detailed Description
The following examples are set forth in order to more particularly illustrate the principles of the present utility model and are intended to provide a more thorough understanding of the present utility model, and are not intended to limit the scope of the present utility model to all other embodiments which will be apparent to those of ordinary skill in the art without undue burden.
As shown in figure 1, a hydrogen chloride recovery unit for PVC production, including absorption tower 1, knockout drum 2, alkaline wash jar 3, be provided with gaseous phase export 4 and gaseous phase import 5 on the absorption tower 1, gaseous phase export 4 and alkaline wash jar 3 pipe connection, the knockout drum 2 outside is provided with heat transfer device 17 and heating device 9, gaseous phase import 5 and heat transfer device 17 pipe connection, be provided with liquid phase import 6 and liquid phase export 7 on the absorption tower 1, liquid phase import 6 and liquid phase export 7 respectively with knockout drum 2 pipe connection, be provided with pump body 8 on the pipeline between absorption tower 1 and knockout drum 2. In the embodiment of the utility model, the absorption tower 1 is a concentrated sulfuric acid absorption tower, the mixed gas of chloroethylene and hydrogen chloride generated during PVC production is introduced into the absorption tower filled with the concentrated sulfuric acid, the concentrated sulfuric acid can separate the hydrogen chloride from the chloroethylene gas according to the characteristic that the hydrogen chloride is easy to absorb water, the mixed acid after the absorption of the hydrogen chloride by the absorption tower 1 flows into the separation tank 2, the mixed acid is heated in the separation tank 2, the hydrogen chloride gas and sulfuric acid solution can be separated, and the separated hydrogen chloride can be used for recycling raw materials of the chloroethylene after purification. In the embodiment of the utility model, the excessive hydrogen chloride gas in the PVC production process is separated from the hydrogen chloride gas after passing through the absorption tower 1 and the separation tank 2, and the separated hydrogen chloride is used as a raw material for producing the vinyl chloride. The gas passing through the absorption tower 1 also contains a small amount of hydrogen chloride gas, and the tail gas can be comprehensively treated through the alkaline washing tank 3, so that the discharged tail gas is ensured to contain no hydrogen chloride gas. In the embodiment of the utility model, the liquid phases in the absorption tower 1 and the separation tank 2 are sulfuric acid solutions, the sulfuric acid solution between the absorption tower 1 and the separation tank 2 can be recycled, the sulfuric acid solution in the absorption tower 1 absorbs and dissolves hydrogen chloride gas in the mixed gas to form a mixed acid solution, the mixed acid solution is heated in the separation tank to separate out the hydrogen chloride gas, and the separated sulfuric acid solution is pumped into the absorption tower 1 through the pump body 8 to continuously adsorb the hydrogen chloride gas to form a closed loop. Compared with other alkaline washing adsorption processes, the device provided by the embodiment of the utility model has fewer byproducts, and the recovered hydrogen chloride can be reused, so that the cost in the production process of vinyl chloride can be reduced, and the device has strong practicability.
The gas phase inlet 5 is arranged at the bottom of the absorption tower 1, and the gas phase outlet 4 is arranged at the top of the absorption tower 1. In the embodiment of the utility model, the mixer after the vinyl chloride is produced is high-temperature gas, which contains vinyl chloride and hydrogen chloride gas, wherein the vinyl chloride is insoluble in water and acid, and the hydrogen chloride gas is very soluble in water and acid, so that the hydrogen chloride gas can be separated from the vinyl chloride. Introducing the mixed gas into the bottom of the absorption tower 1, fully contacting with an acid solution, absorbing hydrogen chloride gas, and further performing alkaline washing on the mixed gas subjected to acid washing by an alkaline washing tank 3 to ensure that the treated gas does not contain the hydrogen chloride gas.
The separation tank 2 is arranged below the absorption tower 1, the liquid phase outlet 7 is arranged at the bottom of the absorption tower 1, the liquid phase inlet 6 is arranged on the side wall of the absorption tower 1, and the pump body 8 is arranged between the liquid phase inlet 6 and the separation tank 2. In the embodiment of the utility model, the liquid phase is sulfuric acid solution, and the liquid phase in the absorption tower 1 can flow into the separation tank 2 under the action of gravity, and hydrogen chloride gas and solution are separated in the separation tank 2. The separated solution is pumped into the absorption tower 1 through the pump body 8 and is reused.
The separator tank 2 is provided with a gas-phase recovery port 10. In the embodiment of the utility model, the hydrogen chloride gas separated in the separation tank 2 can be used as the raw material gas of the vinyl chloride.
The heat exchange device 17 comprises a gas phase pipeline and a liquid phase pipeline, the gas phase pipeline is connected with the gas phase inlet 5 of the absorption tower 1, and the liquid phase pipeline is in through connection with the inner cavity of the separation tank 2.
The alkaline washing tank 3 is provided with an air inlet 13 and an air outlet 14, and the air inlet 13 and the air outlet 14 respectively extend to the bottom of the alkaline washing tank 3.
A cooling device 15 is arranged at the gas phase inlet 5.
The pipeline communicated with the gas phase recovery port 10 is provided with a hydrogen chloride buffer tank 16.
The above embodiments are not intended to limit the present utility model, however, and the present utility model is not limited to the above examples, but is also intended to be within the scope of the present utility model.
Claims (8)
1. The utility model provides a PVC production is with hydrogen chloride recovery unit which characterized in that:
including absorption tower (1), knockout drum (2), alkaline wash jar (3), be provided with gaseous phase export (4) and gaseous phase import (5) on absorption tower (1), gaseous phase export (4) and alkaline wash jar (3) pipe connection, knockout drum (2) outside is provided with heat transfer device (17) and heating device (9), gaseous phase import (5) and heat transfer device (17) pipe connection, be provided with liquid phase import (6) and liquid phase export (7) on absorption tower (1), liquid phase import (6) and liquid phase export (7) respectively with knockout drum (2) pipe connection, be provided with pump body (8) on the pipeline between absorption tower (1) and knockout drum (2).
2. The hydrogen chloride recovery device for PVC production according to claim 1, wherein:
the gas phase inlet (5) is arranged at the bottom of the absorption tower (1), and the gas phase outlet (4) is arranged at the top of the absorption tower (1).
3. The hydrogen chloride recovery device for PVC production according to claim 1, wherein:
the separation tank (2) is arranged below the absorption tower (1), the liquid phase outlet (7) is arranged at the bottom of the absorption tower (1), the liquid phase inlet (6) is arranged on the side wall of the absorption tower (1), and the pump body (8) is arranged between the liquid phase inlet (6) and the separation tank (2).
4. A hydrogen chloride recovery device for PVC production according to claim 1 or 3, wherein:
the separation tank (2) is provided with a gas-phase recovery port (10).
5. The hydrogen chloride recovery device for PVC production according to claim 1, wherein:
the heat exchange device (17) comprises a gas phase pipeline and a liquid phase pipeline, the gas phase pipeline is connected with a gas phase inlet (5) of the absorption tower (1), and the liquid phase pipeline is in through connection with the inner cavity of the separation tank.
6. The hydrogen chloride recovery device for PVC production according to claim 1, wherein:
the alkaline washing tank (3) is provided with an air inlet (13) and an air outlet (14), and the air inlet (13) and the air outlet (14) respectively extend to the bottom of the alkaline washing tank (3).
7. A hydrogen chloride recovery device for PVC production according to claim 1 or 2, wherein,
the gas phase inlet (5) is provided with a cooling device (15).
8. The apparatus for recovering hydrogen chloride for PVC production according to claim 4, wherein:
a hydrogen chloride buffer tank (16) is arranged on a pipeline communicated with the gas phase recovery port (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321979840.8U CN220364366U (en) | 2023-07-26 | 2023-07-26 | Hydrogen chloride recovery unit is used in PVC production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321979840.8U CN220364366U (en) | 2023-07-26 | 2023-07-26 | Hydrogen chloride recovery unit is used in PVC production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220364366U true CN220364366U (en) | 2024-01-19 |
Family
ID=89514368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321979840.8U Active CN220364366U (en) | 2023-07-26 | 2023-07-26 | Hydrogen chloride recovery unit is used in PVC production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220364366U (en) |
-
2023
- 2023-07-26 CN CN202321979840.8U patent/CN220364366U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |