Tail gas treatment device for chlorobenzonitrile production

Abstract

The invention discloses a tail gas treatment device for o-chlorobenzonitrile production, and relates to the technical field of waste gas treatment. According to the tail gas treatment device for o-chlorobenzonitrile production, through cooperation of the middle partition plates and the filter cartridges, when waste gas enters the machine body, spraying treatment can be carried out while the waste gas is conveyed along the multiple middle partition plates, large-particle impurities in the waste gas are removed, the contact uniformity of the waste gas and spraying water is improved, and the service life of the waste gas is prolonged. And in the use process, the replacement, desorption and drying operations of the filter cartridge and the filter module can be automatically completed, so that the treatment effect of the waste gas is improved while continuous operation is ensured, and the maintenance convenience of the equipment is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of waste gas treatment, in particular to a tail gas treatment device for o-chlorobenzeneitrile production. BACKGROUND

[0002] O-chlorobenzeneitrile is mainly used for synthesizing dye intermediate 2-cyano-4-nitroaniline and is used for synthesizing new antimalarial drug nitroquine in the pharmaceutical industry, and needs to be purified and treated during production; according to Chinese Patent No. CN218221623U, a tail gas treatment device for carboxyl butyronitrile latex production is disclosed, which points out that the current equipment cannot conveniently disassemble the air inlet pipe and the filter box, does not have the function of replacing the filter element, and cannot be connected with the air outlet pipe after long-term use of the filter element, thereby having certain use defects; however, the device still has the problems of poor waste gas filtering effect and difficult equipment maintenance, and the like, and the application provides a tail gas treatment device for o-chlorobenzeneitrile production to solve the above problems. SUMMARY

[0003] In view of the deficiencies of the prior art, the application provides a tail gas treatment device for o-chlorobenzeneitrile production, which solves the problems in the background art.

[0004] To achieve the above purpose, the application is implemented by the following technical scheme: a tail gas treatment device for o-chlorobenzeneitrile production, comprising a machine body, an air inlet pipe fixedly installed at the end of the machine body and used for conveying waste gas to the inside of the machine body, a plurality of middle partition plates fixedly installed at the inside of the machine body, a plurality of spraying frames fixedly installed at the top of the middle partition plates and used for spraying the conveyed waste gas,

[0005] a plurality of filter cartridges provided at the end of the machine body away from the middle partition plates, a plurality of filter modules fixedly installed in the filter cartridges and used for filtering the conveyed waste gas,

[0006] an air outlet frame fixedly installed at the outside of the air outlet disc frame and used for discharging the filtered waste gas, a driving assembly provided in the inside of the machine body and used for driving the filter cartridges to rotate in the machine body and automatically replacing the filter cartridges connected with the air outlet frame,

[0007] a steam module and a drying module fixedly installed at the end of the machine body, the steam module being in communication with the corresponding filter cartridge and used for conveying high-temperature steam to the inside of the corresponding filter cartridge to realize the desorption operation of the filter module, and the drying module being connected with the corresponding filter cartridge through an air conveying frame and used for drying the filter module.

[0008] Preferably, the driving assembly comprises a driving shaft rotatably installed in the interior of the body, both ends of the driving shaft are fixedly installed with end plate one and end plate two, a plurality of filter cartridges are fixedly installed between the end plate one and the end plate two, the inner side of the middle part of the body is fixedly installed with a positioning disc holder, the end plate two is rotatably connected with the positioning disc holder, the positioning disc holder and the middle partition are fixedly installed with a gas gathering holder, the gas gathering holder is used for conveying exhaust gas to the inside of the corresponding filter cartridge, the inner side of the end part of the body is fixedly installed with an air outlet disc holder, and the air outlet disc holder is rotatably connected with the end plate one.

[0009] Preferably, the outer side of the body is fixedly installed with a driving motor, and a shaft coupling is arranged between the output end of the driving motor and the driving shaft, so as to drive the driving shaft and the plurality of filter cartridges to rotate.

[0010] Preferably, a sealing ring is arranged between the end plate two and the positioning disc holder, a plurality of sealing holders matched with the filter cartridges are fixedly installed on the side of the end plate one close to the inner wall of the body, and a protective cover is fixedly installed on the outer side of the body.

[0011] Preferably, the end of the positioning disc holder away from the filter cartridges is fixedly installed with an exhaust gas conveying pipe and a plurality of hot air conveying pipes, the end parts of the plurality of hot air conveying pipes all pass through the body, the top of the body is fixedly installed with an exhaust gas purification module, and the exhaust gas conveying pipe and the exhaust gas purification module are in communication.

[0012] Preferably, the interior of the body is provided with a cleaning assembly, and the cleaning assembly is used for cleaning and collecting the wastewater and impurities generated by spraying in the interior of the body.

[0013] Preferably, the cleaning assembly comprises an end limiting holder and a plurality of cleaning scrapers, a transmission sliding rod is fixedly installed between the plurality of cleaning scrapers and the end limiting holder, the plurality of cleaning scrapers are slidingly installed in the interior of the body and are kept in close contact with the inner bottom of the body, the end limiting holder is located on the outer side of the body, the transmission sliding rod passes through the body and is slidingly connected with the body, and the bottom of the body is fixedly installed with a recovery module, and the inner bottom of the body and the recovery module are both provided with a rectangular notch, so that the wastewater and impurities after spraying can enter the recovery module through the rectangular notch.

[0014] Preferably, the bottom of the recovery module is fixedly installed with a driving cylinder body, the output end of the driving cylinder body is fixedly installed with a transmission holder, and the transmission holder is fixedly installed at the bottom of the end limiting holder, so as to drive the plurality of cleaning scrapers to move in the interior of the body through the cooperation of the end limiting holder and the transmission sliding rod, and realize the scraping and cleaning of the impurities.

[0015] Preferably, a sealing plate is rotatably installed inside the rectangular slot at the bottom of the inner side of the machine body. The sealing plate is used to seal the rectangular slot. Multiple transmission rods are fixedly installed on the top of the sealing plate, so that when multiple cleaning scrapers move above the sealing plate, the sealing plate can be driven to rotate downward and open through the transmission rods.

[0016] Preferably, a limiting shaft is fixedly installed at the end of the sealing plate, the limiting shaft is rotatably connected to the machine body, and a torsion spring for resetting is sleeved at the end of the limiting shaft.

[0017] This invention provides a tail gas treatment device for the production of o-chlorobenzonitrile. Compared with the prior art, it has the following advantages:

[0018] (1) The tail gas treatment device for o-chlorobenzonitrile production, through the cooperation of the middle baffle and the filter cartridge, when the exhaust gas enters the machine body, it can be sprayed along multiple middle baffles to remove large particulate impurities in the exhaust gas, improve the uniformity of contact between the exhaust gas and the spray water, until the exhaust gas passes through the filter cartridge to complete the secondary filtration of the exhaust gas. During use, it can automatically complete the replacement, desorption and drying of the filter cartridge and filter module, ensuring continuous operation while improving the treatment effect of the exhaust gas and improving the maintenance convenience of the equipment.

[0019] (2) The tail gas treatment device for o-chlorobenzonitrile production, through the setting of the cleaning component, drives the end limit frame to run through the transmission frame, so that the cleaning scraper can slide along the bottom of the inner side of the machine body through the cooperation of the transmission slide rod, and scrape and push the impurities deposited inside the machine body. When the cleaning scraper moves above the sealing plate, it can press the sealing plate down through the transmission support rod, so that the sealing plate can rotate along the limit shaft, so that the deposited impurities and spray water flow into the recovery module through the rectangular slot. When the cleaning scraper is reset, the sealing plate can reseal the rectangular slot through the cooperation of the limit shaft and the torsion spring, so as to achieve self-cleaning of the machine body, ensure the sealing of the operation and improve the maintenance convenience of the equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 For the present invention Figure 1 Schematic diagram of cross-section structure;

[0022] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0023] Figure 4 For the present invention Figure 2 Side view structural diagram;

[0024] Figure 5 Structure diagram of the cleaning assembly of the present application;

[0025] Figure 6 Structure diagram of the filter cartridge, air outlet disc holder and positioning disc holder of the present application;

[0026] Figure 7 Structure diagram of the present application Figure 6 Structure diagram of the present application

[0027] Figure 8 Structure diagram of the present application

[0028] In the figure: 1, body; 2, protective cover; 3, air inlet pipe; 4, middle partition; 5, spraying holder; 6, air gathering holder; 7, drive shaft; 701, end plate one; 702, end plate two; 703, drive motor; 704, sealing holder; 705, sealing ring; 8, filter cartridge; 801, filter module; 9, air outlet disc holder; 901, air outlet holder; 10, steam module; 11, drying module; 111, air conveying holder; 12, positioning disc holder; 121, hot air conveying pipe; 122, waste gas conveying pipe; 123, waste gas purification module; 13, end limiting holder; 131, transmission slide rod; 132, cleaning scraper; 14, drive cylinder; 141, transmission holder; 15, recycling module; 16, rectangular notch; 17, sealing plate; 171, limiting shaft; 172, transmission support rod. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] Please refer to Figures 1-8 The present application provides two technical solutions, specifically including the following embodiments:

[0031] Embodiment one:

[0032] A tail gas treatment device for producing chlorobenzoic acid, comprising a body 1, an air inlet pipe 3 is fixedly installed at the end of the body 1, for conveying waste gas into the body 1, a plurality of middle partitions 4 are fixedly installed at the inside end of the body 1, a plurality of spraying holders 5 are fixedly installed at the top of the middle partitions 4, and the spraying holders 5 are used for spraying the conveyed waste gas;

[0033] In the embodiment of the present application, the spraying holder 5 is an existing device, which is used for conveying spraying water into the body 1 to realize the spraying operation of the waste gas, and will not be described here;

[0034] In the embodiment of the present application, the body 1 is provided with a plurality of filter cartridges 8 at one end away from the middle partition plate 4, and a plurality of filter modules 801 are fixedly installed inside the filter cartridges 8, which are used for filtering the conveyed waste gas;

[0035] In the pretreatment process of the waste gas, the waste gas can enter the inside of the body 1 through the gas inlet pipe 3, and then be conveyed along the plurality of middle partition plates 4, and be sprayed by the spraying frame 5 during the conveying process to remove large particulate impurities contained in the waste gas, until the waste gas enters the inside of the filter cartridge 8 and realizes secondary filtering operation through the filter module 801;

[0036] The outer side of the gas outlet disc frame 9 is fixedly installed with an exhaust frame 901, which is used for discharging the filtered waste gas, and the inside of the body 1 is provided with a driving assembly, which is used for driving the filter cartridge 8 to rotate inside the body 1, and automatically replacing the filter cartridge 8 connected with the exhaust frame 901;

[0037] Specifically, the waste gas after secondary filtering through the filter module 801 can be discharged through the exhaust frame 901, and when the filter module 801 inside the filter cartridge 8 needs to be replaced, the driving assembly can be operated to drive the filter cartridge 8 to rotate, so that the replacement of the filter cartridge 8 can be completed, ensuring the filtering effect of the equipment and the operation convenience;

[0038] In the embodiment of the present application, the filter module 801 is prepared from existing activated carbon material, which will not be described here;

[0039] The end of the body 1 is fixedly installed with a steam module 10 and a drying module 11 respectively, the steam module 10 is in communication with the corresponding filter cartridge 8, which is used for conveying high-temperature steam into the inside of the corresponding filter cartridge 8 to realize the desorption operation of the filter module 801, and the drying module 11 is connected with the air conveying frame 111 between the corresponding filter cartridge 8, which is used for drying the filter module 801;

[0040] In the embodiment of the present application, the steam module 10 is an existing device, which is used for conveying high-temperature steam into the inside of the corresponding filter cartridge 8 to realize the desorption operation of the filter module 801, which will not be described here;

[0041] After the replacement of the filter cartridge 8 is completed, the steam module 10 is operated to convey high-temperature steam into the inside of the used filter cartridge 8, so that the filter module 801 is desorbed by the high-temperature steam, and the filter module 801 after desorption can continuously rotate to the drying position with the filter cartridge 8, and then the filter module 801 is dried by the operation of the drying module 11;

[0042] In the embodiment of the present application, the drying module 11 is a conventional hot air drying device. When the filter module 801 inside the filter cartridge 8 is completed desorption and rotates to the drying position, the hot air can be delivered to the inside of the corresponding filter cartridge 8 through the operation of the drying module 11, so as to realize the drying treatment of the filter module 801.

[0043] In the embodiment of the present application, the driving assembly comprises a driving shaft 7, which is rotatably installed in the inside of the body 1. The two ends of the driving shaft 7 are respectively fixedly installed with an end plate one 701 and an end plate two 702. A plurality of filter cartridges 8 are fixedly installed between the end plate one 701 and the end plate two 702. A positioning disc rack 12 is fixedly installed at the middle part of the inside of the body 1. The end plate two 702 is rotatably connected with the positioning disc rack 12. A gas gathering rack 6 is fixedly installed between the positioning disc rack 12 and the middle partition plate 4. The gas gathering rack 6 is used for delivering the exhaust gas to the inside of the corresponding filter cartridge 8. An air outlet disc rack 9 is fixedly installed at the end of the inside of the body 1. The air outlet disc rack 9 is rotatably connected with the end plate one 701.

[0044] When the exhaust gas passes through the spraying, it can enter the inside of the gas gathering rack 6 along the middle partition plate 4, and then be delivered to the inside of the corresponding filter cartridge 8 by the gas gathering rack 6 for secondary filtration. When the filter cartridge 8 needs to be replaced, the driving shaft 7 is rotated to drive a plurality of filter cartridges 8 along with the driving shaft 7. At this time, the used filter cartridge 8 can be rotated to the cleaning position, and the filter cartridge 8 at the drying position can be rotated to the filtering position, thereby completing the automatic replacement of the filter cartridge 8.

[0045] Specifically, the above-mentioned filtering position is between the gas gathering rack 6 and the exhaust rack 901, which is used for realizing the filtering operation. The above-mentioned cleaning position is a position corresponding to the steam module 10. The above-mentioned drying position is a position corresponding to the drying module 11. The drying position is provided with a plurality of drying positions. When the filter cartridge 8 is rotated during replacement, it can first reach the cleaning position, and then continuously rotate to reach the drying position. Details are not described herein.

[0046] In the embodiment of the present application, a driving motor 703 is fixedly installed at the outside of the body 1. A shaft coupling is arranged between the output end of the driving motor 703 and the driving shaft 7, which is used for driving the driving shaft 7 and a plurality of filter cartridges 8 to rotate.

[0047] In the embodiment of the present application, the driving motor 703 is a conventional device, and details are not described herein.

[0048] In the embodiment of the present application, a sealing ring 705 is arranged between the end plate two 702 and the positioning disc rack 12. A plurality of sealing racks 704 matched with the filter cartridges 8 are fixedly installed on the side of the end plate one 701 close to the inner wall of the body 1. A protective cover 2 is fixedly installed at the outside of the body 1.

[0049] In the embodiment of the present application, the sealing ring 705 and the sealing frame 704 are used to improve the sealing performance between the filter cartridge 8 and the positioning disc frame 12 and the air outlet disc frame 9.

[0050] The end of the positioning disc frame 12 away from the filter cartridge 8 is fixedly installed with a waste gas conveying pipe 122 and a plurality of hot air conveying pipes 121, the end of the plurality of hot air conveying pipes 121 penetrates out of the machine body 1, and the top of the machine body 1 is fixedly installed with a waste gas purification module 123, the waste gas conveying pipe 122 and the waste gas purification module 123 are in communication with each other.

[0051] When the steam module 10 is running, the high-temperature steam enters the inside of the filter cartridge 8 to complete the cleaning and desorption of the filter module 801, and the used steam and impurities can be discharged to the waste gas purification module 123 through the waste gas conveying pipe 122; when the drying module 11 is running, the hot air can pass through the filter cartridge 8 and then be discharged through the corresponding hot air conveying pipe 121.

[0052] In the embodiment of the present application, the waste gas purification module 123 is internally provided with an adsorption layer for adsorbing impurities in the gas.

[0053] In the embodiment of the present application, the inside of the machine body 1 is provided with a cleaning assembly for cleaning and collecting the waste water and impurities generated by spraying in the inside of the machine body 1.

[0054] The cleaning assembly comprises an end limiting frame 13 and a plurality of cleaning scrapers 132, a transmission sliding rod 131 is fixedly installed between the plurality of cleaning scrapers 132 and the end limiting frame 13, the plurality of cleaning scrapers 132 are slidingly installed in the inside of the machine body 1 and are in close contact with the inner bottom of the machine body 1, the end limiting frame 13 is located on the outside of the machine body 1, the transmission sliding rod 131 penetrates through the machine body 1 and is in sliding connection with the machine body 1, a recovery module 15 is fixedly installed at the bottom of the machine body 1, and a rectangular notch 16 is formed in the inner bottom of the machine body 1 and in the recovery module 15, so that the waste water and impurities after spraying can enter the recovery module 15 through the rectangular notch 16.

[0055] A drive cylinder 14 is fixedly installed at the bottom of the recovery module 15, a transmission frame 141 is fixedly installed at the bottom of the end limiting frame 13 and is fixedly installed at the output end of the drive cylinder 14, so that the plurality of cleaning scrapers 132 can be driven to move in the inside of the machine body 1 through the cooperation of the end limiting frame 13 and the transmission sliding rod 131, and the impurities can be scraped and cleaned.

[0056] A sealing plate 17 is rotatably installed in the rectangular notch 16 formed in the inner bottom of the machine body 1, the sealing plate 17 is used to seal the rectangular notch 16, a plurality of transmission support rods 172 are fixedly installed at the top of the sealing plate 17, so that when the plurality of cleaning scrapers 132 move above the sealing plate 17, the sealing plate 17 can be driven to rotate downward and open through the transmission support rods 172.

[0057] The end of the sealing plate 17 is fixedly installed with a limiting shaft 171, which is rotationally connected with the body 1, and the end of the limiting shaft 171 is sleeved with a torsion spring for resetting;

[0058] By the arrangement of the cleaning assembly, firstly, the initial position of the sealing plate 17 blocks the rectangular notch 16, when the spraying frame 5 is in the process of spraying, the spraying water and impurities can be collected at the inner bottom of the body 1, at this time, by driving the cylinder body 14 to operate, the end limiting frame 13 can be driven to operate by the transmission frame 141, so that the cleaning scraper 132 can slide along the inner bottom of the body 1 by the cooperation of the transmission slide rod 131, and the impurities deposited in the body 1 are scraped and pushed, when the cleaning scraper 132 moves above the sealing plate 17, the sealing plate 17 can be pressed down by the transmission support rod 172, so that the sealing plate 17 can rotate along the limiting shaft 171, until the deposited impurities and spraying water flow into the recycling module 15 through the rectangular notch 16, when the cleaning scraper 132 is reset, the sealing plate 17 can reseal the rectangular notch 16 by the cooperation of the limiting shaft 171 and the torsion spring, realizing self-cleaning of the inside of the body 1, ensuring the operation sealing performance and improving the maintenance convenience of the equipment;

[0059] Specifically, the torsion spring is an existing device, which is not shown in the figure.

[0060] Meanwhile, the contents not described in detail in the specification all belong to the prior art known to those skilled in the art.

[0061] The above has described one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made according to the scope of the present application should still belong to the scope of the present application.

Claims

1. A tail gas treatment device for o-chlorobenzonitrile production, comprising a body (1), characterized in that: An air inlet pipe (3) is fixedly installed at the end of the body (1) for conveying exhaust gas into the body (1). Multiple central partitions (4) are fixedly installed at one end of the body (1). Multiple spray racks (5) are fixedly installed on the top of the central partitions (4). The spray racks (5) are used to spray the conveyed exhaust gas. The body (1) has multiple filter cylinders (8) at one end away from the middle partition (4). Multiple filter modules (801) are fixedly installed inside the filter cylinders (8). The filter modules (801) are used to filter the conveyed exhaust gas. An exhaust rack (901) is fixedly installed on the outside of the exhaust plate frame (9). The exhaust rack (901) is used to discharge the filtered exhaust gas. The machine body (1) is equipped with a drive assembly. The drive assembly is used to drive the filter cylinder (8) to rotate inside the machine body (1) and automatically replace the filter cylinder (8) connected to the exhaust rack (901). A steam module (10) and a drying module (11) are fixedly installed at the ends of the body (1). The steam module (10) is connected to the corresponding filter cylinder (8) and is used to transport high-temperature steam to the inside of the corresponding filter cylinder (8) to realize the desorption operation of the filter module (801). An air conveying frame (111) is connected between the drying module (11) and the corresponding filter cylinder (8) for drying the filter module (801).

2. The tail gas treatment device for o-chlorobenzonitrile production according to claim 1, characterized in that: The drive assembly includes a drive shaft (7), which is rotatably installed inside the body (1). End plate 1 (701) and end plate 2 (702) are fixedly installed at both ends of the drive shaft (7). Multiple filter cartridges (8) are fixedly installed between end plate 1 (701) and end plate 2 (702). A positioning plate frame (12) is fixedly installed in the middle of the inner side of the body (1). End plate 2 (702) is rotatably connected to the positioning plate frame (12). A gas gathering frame (6) is fixedly installed between the positioning plate frame (12) and the middle partition (4). The gas gathering frame (6) is used to transport exhaust gas to the interior of the corresponding filter cartridge (8). An exhaust plate frame (9) is fixedly installed at the inner end of the body (1). The exhaust plate frame (9) is rotatably connected to end plate 1 (701).

3. The tail gas treatment device for o-chlorobenzonitrile production according to claim 2, characterized in that: A drive motor (703) is fixedly installed on the outside of the body (1). A coupling is provided between the output end of the drive motor (703) and the drive shaft (7) to drive the drive shaft (7) and multiple filter cartridges (8) to rotate.

4. The tail gas treatment device for o-chlorobenzonitrile production according to claim 2, characterized in that: A sealing ring (705) is provided between the end plate 2 (702) and the positioning plate frame (12). Multiple sealing frames (704) that are compatible with the filter cartridge (8) are fixedly installed on the side of the end plate 1 (701) near the inner wall of the machine body (1). A protective cover (2) is fixedly installed on the outer side of the machine body (1).

5. The tail gas treatment device for o-chlorobenzonitrile production according to claim 2, characterized in that: The positioning plate frame (12) is fixedly installed with an exhaust gas delivery pipe (122) and multiple hot air delivery pipes (121) at the end away from the filter cylinder (8). The ends of the multiple hot air delivery pipes (121) all extend out of the machine body (1). An exhaust gas purification module (123) is fixedly installed on the top of the machine body (1). The exhaust gas delivery pipe (122) and the exhaust gas purification module (123) are interconnected.

6. The tail gas treatment device for o-chlorobenzonitrile production according to claim 1, characterized in that: The machine body (1) is equipped with a cleaning component inside, which is used to clean and collect the wastewater and impurities generated by the spraying inside the machine body (1).

7. The tail gas treatment device for o-chlorobenzonitrile production according to claim 6, characterized in that: The cleaning assembly includes an end limit frame (13) and multiple cleaning scrapers (132). A transmission slide rod (131) is fixedly installed between the multiple cleaning scrapers (132) and the end limit frame (13). The multiple cleaning scrapers (132) are slidably installed inside the body (1) and are in contact with the inner bottom of the body (1). The end limit frame (13) is located outside the body (1). The transmission slide rod (131) passes through the body (1) and is slidably connected to it. A recycling module (15) is fixedly installed at the bottom of the body (1). A rectangular slot (16) is opened on the inner bottom of both the recycling module (15) and the body (1) to allow the wastewater and impurities after spraying to enter the recycling module (15) through the rectangular slot (16).

8. The tail gas treatment device for o-chlorobenzonitrile production according to claim 7, characterized in that: The bottom of the recycling module (15) is fixedly installed with a drive cylinder (14), and the output end of the drive cylinder (14) is fixedly installed with a transmission frame (141). The transmission frame (141) is fixedly installed at the bottom of the end limit frame (13) and is used to drive multiple cleaning scrapers (132) to move inside the machine body (1) through the cooperation of the end limit frame (13) and the transmission slide rod (131) to achieve the scraping and cleaning of impurities.

9. The tail gas treatment device for o-chlorobenzonitrile production according to claim 7, characterized in that: A sealing plate (17) is rotatably installed inside a rectangular slot (16) at the bottom inner side of the body (1). The sealing plate (17) is used to seal the rectangular slot (16). Multiple transmission rods (172) are fixedly installed on the top of the sealing plate (17). When multiple cleaning scrapers (132) move above the sealing plate (17), the sealing plate (17) can be driven to rotate downward and open through the transmission rods (172).

10. A tail gas treatment device for o-chlorobenzonitrile production according to claim 9, characterized in that: The sealing plate (17) has a limiting shaft (171) fixedly installed at its end. The limiting shaft (171) is rotatably connected to the body (1). The end of the limiting shaft (171) is fitted with a torsion spring for resetting.

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