CN211069089U - Device for recycling vinyl chloride in waste alkali liquor in vinyl chloride water alkali washing process - Google Patents
Device for recycling vinyl chloride in waste alkali liquor in vinyl chloride water alkali washing process Download PDFInfo
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- CN211069089U CN211069089U CN201921436400.1U CN201921436400U CN211069089U CN 211069089 U CN211069089 U CN 211069089U CN 201921436400 U CN201921436400 U CN 201921436400U CN 211069089 U CN211069089 U CN 211069089U
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Abstract
The utility model relates to a device of chloroethylene in chloroethylene aqueous alkali washing process recovery waste alkali lye, including dilute alkali groove (6), lye pump (5), heat exchanger (3), strip tower (13) and top of the tower condenser (9) that connect gradually. The utility model discloses a plate stripping tower and economic benefits and social benefits heat exchanger organic combination, the column plate of arranging in the plate stripping tower makes the gaseous and the steam mass transfer bottom the stripping tower of chloroethylene in the alkali wash tower blowdown waste lye, and chloroethylene is gaseous to be less than and to contain 10mg/m3 in the recoverable alkali wash tower blowdown waste lye.
Description
Technical Field
The utility model relates to the technical field of chemical industry, especially a chloroethylene water alkali wash device of chloroethylene in process recovery waste alkali lye.
Background
In the polyvinyl chloride production process, in a vinyl chloride synthesis section, after a mixed gas of acetylene and hydrogen chloride is converted by a converter, a crude vinyl chloride gas is cooled by a vinyl chloride cooler and then enters a combined tower and a water washing tower to remove most of hydrogen chloride gas, the remaining small amount of hydrogen chloride gas and carbon dioxide gas are removed by sodium hydroxide in an alkaline washing tower, 5-15% NaOH solution of a primary alkaline washing tower and a secondary alkaline washing tower absorbs residual trace HC L gas and CO2 gas in a raw material gas in the water alkaline washing process to generate NaC L and Na2CO3, the content of sodium hydroxide is gradually reduced along with the accumulation of running time of the sodium hydroxide in the alkaline washing tower, the content of sodium chloride and sodium carbonate is increased, the low-concentration NaOH cannot meet the requirement of alkaline solution concentration required by the water alkaline washing, Na2CO3 particles enriched in the solution and cleaning filler need to be replaced, waste alkaline solution needs to be discharged to a mercury removal device in the process of replacing the solution and the alkaline solution, and about 2% of vinyl chloride entrained in the discharging process is discharged to a factory after being treated.
The water used by the deacidification tower and the washing tower is sent to hydrochloric acid analysis treatment, and the hydrogen chloride and the VC remained in the water are both sent back to the mixing dehydration for recycling after the hydrochloric acid analysis treatment. And the wastewater of the alkaline washing tower is sent to a mercury-removing post for treatment after running for a period of time and then is discharged out of the factory. At 15-85 ℃, the solubility of vinyl chloride in water is almost a constant and is 0.95% (by mass), and the vinyl chloride monomer content is about 266kg according to the existing one-time drainage method for alkali washing tower wastewater at 28m in the aspect of double-cropping cultivation. If the mercury is directly discharged to a mercury removal working section and a drainage pipe network, the following problems can be caused: 1) the environment pollution is caused, and the working policy of environmental protection and energy saving is not met; 2) in the process of conveying and processing, VC gas exists in the inspection well, and VC gas also remains in the processing equipment, so that hidden dangers are left for on-site safety production; 3) and the VC product gas diffuses air, so that resource waste is caused, and loss is brought to enterprises.
Disclosure of Invention
The utility model discloses aim at solving the problem that the alkaline washing tower blowdown waste lye that current vinyl chloride water alkaline washing system exists smugglies the unable recovery of vinyl chloride gas secretly, and provide a device that chloroethylene content is less than 10mg/m3 in the recoverable alkaline washing tower blowdown waste lye.
The utility model provides a technical scheme that its technical problem adopted is: the device for recycling vinyl chloride in waste alkali liquor in the vinyl chloride water alkali washing process is characterized by comprising a dilute alkali tank (6), an alkali liquor pump (5), a heat exchanger (3), a stripping tower (13) and a tower top condenser (9) which are sequentially connected.
The device for recovering vinyl chloride in the waste alkali liquor in the vinyl chloride water alkali washing process is characterized in that the stripping tower is a plate-type stripping tower.
The device for recovering vinyl chloride in the waste alkali liquor in the vinyl chloride water alkali washing process is characterized in that the heat exchanger is a double-effect heat exchanger.
The device for recycling vinyl chloride in the waste alkali liquor in the vinyl chloride water alkali washing process is characterized in that the tower body of the plate-type stripping tower is of a cylindrical structure, the top of the plate-type stripping tower is provided with a gas phase outlet (12), the bottom of the plate-type stripping tower is provided with a waste alkali liquor outlet (1), a tower plate (14) is arranged in the plate-type stripping tower from top to bottom, the upper part of the tower body is provided with a waste alkali liquor inlet (15), and the lower part; the gas phase outlet of the plate-type stripping tower is connected with a gas phase inlet (10) of a tower top condenser through a gas phase connecting pipeline (11), a waste alkali liquor inlet at the upper part of the plate-type stripping tower is connected with a dilute alkali tank outlet through a liquid phase connecting pipeline I (4), and a double-effect heat exchanger and an alkali liquor pump are respectively arranged on the waste alkali liquor connecting pipeline; the waste lye outlet at the bottom of the plate stripping tower is connected with the double-effect heat exchanger through a liquid phase connecting pipeline II (2). The concentration of chloroethylene in the waste alkali liquor produced from the waste alkali liquor outlet of the plate-type stripping tower is less than or equal to 10mg/m 3.
The device for recycling vinyl chloride in the waste alkali liquor in the vinyl chloride water alkali washing process is characterized in that a gas phase outlet (12), a waste alkali liquor outlet (1), a waste alkali liquor inlet (15), a steam inlet (16), a gas phase connecting pipeline (11), a gas phase inlet (10), a liquid phase connecting pipeline I (4) and a liquid phase connecting pipeline II (2) are respectively provided with an automatic control valve; temperature interlocking and liquid level interlocking are set. And the full-automatic operation is realized.
Compared with the prior art, the utility model discloses a plate stripping tower and economic benefits and social benefits heat exchanger organic combination, the column plate of arranging in the plate stripping tower makes the gaseous and the steam mass transfer bottom the stripping tower of chloroethylene in the alkali wash tower blowdown waste lye, and chloroethylene gas is less than containing 10mg/m3 in the recoverable alkali wash tower blowdown waste lye. Through improvement, the content of VC in the alkaline washing wastewater of the water alkaline washing post is basically completely removed, and the VC harmful gas is prevented from flowing to the air to pollute the surrounding environment. The device simple structure to realize full automated operation, reduced staff intensity of labour, improved work efficiency. The optimization of the device for recycling vinyl chloride in the waste alkali liquor in the water and alkali washing process provides safety guarantee for the production of enterprises, prevents inflammable and explosive gas from flowing in inspection wells, channels, process pipelines, equipment and the like, and eliminates potential safety hazards.
Drawings
Fig. 1 is a schematic view of the device of the present invention.
In fig. 1: 1 is the waste lye export, 2 is liquid phase connecting pipeline II, 3 is the heat exchanger, 4 is liquid phase connecting pipeline I, 5 is the lye pump, 6 is the dilute alkali groove, 7 is the alkaline tower blowdown waste lye and advances the dilute alkali groove pipeline, 8 is the top of the tower condenser gas phase export, 9 is the top of the tower condenser, 10 is the gas phase import of top of the tower condenser, 11 is the gas phase connecting pipeline, 12 is the gas phase export, 13 is the stripper, 14 is the column plate, 15 is the waste lye import, 16 is the steam inlet.
Detailed Description
As shown in figure 1, the device for recycling vinyl chloride in waste alkali liquor in the vinyl chloride water alkali washing process comprises a dilute alkali tank (6), an alkali liquor pump (5), a heat exchanger (3), a stripping tower (13) and a tower top condenser (9) which are connected in sequence.
The difference of another embodiment is that the stripping tower is a plate-type stripping tower.
The difference of the other embodiment is that the heat exchanger is a double-effect heat exchanger.
The other embodiment is different in that the tower body of the plate-type stripping tower is of a cylindrical structure, the top of the tower body is provided with a gas phase outlet (12), the bottom of the tower body is provided with a waste alkali liquor outlet (1), a tower plate (14) is arranged in the tower body from top to bottom, the upper part of the tower body is provided with a waste alkali liquor inlet (15), and the lower part of the tower body is provided with a steam inlet (16); the gas phase outlet of the plate-type stripping tower is connected with a gas phase inlet (10) of a tower top condenser through a gas phase connecting pipeline (11), a waste alkali liquor inlet at the upper part of the plate-type stripping tower is connected with a dilute alkali tank outlet through a liquid phase connecting pipeline I (4), and a double-effect heat exchanger and an alkali liquor pump are respectively arranged on the waste alkali liquor connecting pipeline; the waste lye outlet at the bottom of the plate stripping tower is connected with the double-effect heat exchanger through a liquid phase connecting pipeline II (2).
The other embodiment is different in that the gas phase outlet (12), the waste alkali liquor outlet (1), the waste alkali liquor inlet (15), the steam inlet (16), the gas phase connecting pipeline (11), the gas phase inlet (10), the liquid phase connecting pipeline I (4) and the liquid phase connecting pipeline II (2) are all provided with self-control valves; temperature interlocking and liquid level interlocking are set.
The working process of the device is as follows: when the tower is washed, waste alkali liquor containing chloroethylene enters a dilute alkali tank (6), after the tower is washed, the waste alkali liquor in the dilute alkali tank (6) is heated by a double-effect heat exchanger (3) by an alkali liquor pump (5) and then is sent to an upper waste alkali liquor inlet (15) of a plate-type stripping tower (13), enters the plate-type stripping tower to be subjected to mass transfer and heat transfer recovery, then enters a tower top condenser (9) through a gas phase outlet (12) of the plate-type stripping tower, and then leaves the device. Steam enters the plate-type stripping tower from a steam inlet (16), uniformly rises through the tower plate (14), and transfers heat with the waste alkali liquor on the tower plate from bottom to top to recover vinyl chloride in the waste alkali liquor. And the waste alkali liquor after the vinyl chloride gas is recovered enters a double-effect heat exchanger from a waste alkali liquor outlet (1) of the plate-type stripping tower, is cooled and then leaves the device, and finally the vinyl chloride gas in the waste alkali liquor discharged by the alkaline tower is recovered.
Claims (5)
1. The device for recycling vinyl chloride in waste alkali liquor in the vinyl chloride water alkali washing process is characterized by comprising a dilute alkali tank (6), an alkali liquor pump (5), a heat exchanger (3), a stripping tower (13) and a tower top condenser (9) which are sequentially connected.
2. The apparatus for recovering vinyl chloride from waste lye of a vinyl chloride aqueous alkali cleaning process as claimed in claim 1, wherein said stripping tower is a plate-type stripping tower.
3. The apparatus for recovering vinyl chloride from waste alkali liquor in vinyl chloride water alkali washing process as claimed in claim 1, wherein the heat exchanger is a double-effect heat exchanger.
4. The apparatus for recovering vinyl chloride from waste lye in the vinyl chloride water alkali washing process as claimed in claim 2, wherein the tower body of the plate-type stripping tower is of a cylindrical structure, the top of the tower body is provided with a gas phase outlet (12), the bottom of the tower body is provided with a waste lye outlet (1), a tower plate (14) is arranged in the tower body from top to bottom, the upper part of the tower body is provided with a waste lye inlet (15), and the lower part of the tower body is provided with a steam inlet (16); the gas phase outlet of the plate-type stripping tower is connected with a gas phase inlet (10) of a tower top condenser through a gas phase connecting pipeline (11), a waste alkali liquor inlet at the upper part of the plate-type stripping tower is connected with a dilute alkali tank outlet through a liquid phase connecting pipeline I (4), and a double-effect heat exchanger and an alkali liquor pump are respectively arranged on the waste alkali liquor connecting pipeline; waste at the bottom of the plate stripper
The alkali liquor outlet is connected with the double-effect heat exchanger through a liquid phase connecting pipeline II (2).
5. The device for recovering vinyl chloride in waste alkali liquor in the vinyl chloride water alkali washing process according to claim 4, wherein self-control valves are arranged on the gas phase outlet (12), the waste alkali liquor outlet (1), the waste alkali liquor inlet (15), the steam inlet (16), the gas phase connecting pipeline (11), the gas phase inlet (10), the liquid phase connecting pipeline I (4) and the liquid phase connecting pipeline II (2); temperature interlocking and liquid level interlocking are set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921436400.1U CN211069089U (en) | 2019-09-01 | 2019-09-01 | Device for recycling vinyl chloride in waste alkali liquor in vinyl chloride water alkali washing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921436400.1U CN211069089U (en) | 2019-09-01 | 2019-09-01 | Device for recycling vinyl chloride in waste alkali liquor in vinyl chloride water alkali washing process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211069089U true CN211069089U (en) | 2020-07-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921436400.1U Active CN211069089U (en) | 2019-09-01 | 2019-09-01 | Device for recycling vinyl chloride in waste alkali liquor in vinyl chloride water alkali washing process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211069089U (en) |
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2019
- 2019-09-01 CN CN201921436400.1U patent/CN211069089U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210426 Address after: North Road 832000 the Xinjiang Uygur Autonomous Region Shihezi City Development Zone No. 36 Patentee after: TIANCHEN CHEMICAL Co.,Ltd. Patentee after: TIANWEI CHEMICAL Co.,Ltd. Patentee after: XINJIANG TIANYE (Group) Co.,Ltd. Address before: 832000 Xinjiang Uygur autonomous region county level administrative division Shihezi City Beiquan town Qingquan jitianwei Chemical Co., Ltd Patentee before: TIANWEI CHEMICAL Co.,Ltd. Patentee before: XINJIANG TIANYE (Group) Co.,Ltd. |
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| TR01 | Transfer of patent right |