A waste gas treatment device for methyl tin chloride production

Abstract

The present application belongs to the technical field of energy recovery, and particularly relates to a waste gas treatment device for methyl tin chloride production. The present application provides a waste gas treatment device for methyl tin chloride production, which comprises: a condenser for condensing and recovering organic matter; an absorption tower, wherein a plurality of tower plates are provided in the tower body at equal intervals, and the tower plates are provided with a plurality of filter holes; a catalytic furnace for heating and catalyzing the recovery of organic matter; the condenser, the absorption tower and the catalytic furnace are connected in sequence; a plate heat exchanger, one end of the plate heat exchanger is communicated with the condenser, and the other end is communicated with the gas outlet pipe of the absorption tower; and further comprising a sliding rod, a cylinder body and a piston plate, the tower plate is provided with a transverse groove, the sliding rod is in sliding and sealing connection with the transverse groove, the sliding rod is provided with a plurality of through holes, the through holes are matched with the filter holes, the cylinder body is arranged in the tower plate, the piston plate is in sliding and sealing connection with the cylinder body, and the piston plate is fixedly connected with the sliding rod. The present application solves the problem that the device cannot be operated for a long time due to the blockage of the filter holes of the tower plate.

Description

Technical Field

[0001] This invention belongs to the field of energy recovery technology, specifically relating to a waste gas treatment device for the production of methyltin chloride. Background Technology

[0002] The production of methyltin chloride generates waste gas containing volatile organic compounds (VOCs) and other harmful gases. If this waste gas is released directly into the atmosphere without treatment, it will not only pollute the environment but may also harm human health. Therefore, developing efficient waste gas treatment devices is crucial for achieving environmental protection goals and safeguarding worker health.

[0003] Currently, a product separation process and apparatus for the catalytic oxidation of hydrogen chloride to chlorine, with announcement number CN115806273A, is disclosed. The process involves the gaseous product undergoing two-stage condensation, dehydration, pressurization, cooling, and cryogenic distillation in a product separation device to obtain the separated product. The apparatus includes a condensation separation and dehydration unit, a gas compression unit, and a cryogenic distillation unit. It utilizes the efficient separation and recovery of chlorine-containing gas after the catalytic oxidation reaction of hydrogen chloride gas and oxygen. The chlorine is dried by condensation and concentrated sulfuric acid, and then the chlorine in the gas phase is subjected to cryogenic distillation under high pressure to achieve chlorine recovery.

[0004] However, there are some problems: the absorption tower of this scheme is prone to clogging, making it unable to operate for a long time. Summary of the Invention

[0005] This solution provides a waste gas treatment device for the production of methyltin chloride, which solves the problem that the device cannot operate for a long time due to the blockage of the filter holes in the tower plate.

[0006] This solution provides a waste gas treatment device for the production of methyltin chloride, including:

[0007] Condenser: Used for condensing and recovering organic matter;

[0008] Absorption tower: The tower plates are provided in multiple ways, and the multiple tower plates are arranged in a staggered manner at equal intervals in the tower body. The tower plates are provided with multiple filter holes.

[0009] Catalytic furnace: used for heating and catalytically recovering organic matter;

[0010] The condenser, absorption tower, and catalytic furnace are connected in sequence.

[0011] Plate heat exchanger: One end of the plate heat exchanger is connected to the condenser, and the other end is connected to the gas outlet pipe of the absorption tower.

[0012] It also includes a sliding rod, a cylinder, and a piston plate. The tower plate is provided with a transverse groove. The sliding rod is slidably and sealingly connected to the transverse groove. The sliding rod is provided with multiple through holes. The through holes cooperate with the filter holes. The cylinder is disposed inside the tower plate. The piston plate is slidably and sealingly connected to the cylinder. The piston plate is fixedly connected to the sliding rod.

[0013] The principle of this scheme is as follows: the condenser performs low-temperature condensation (0~5℃) to recover volatile organic compounds (such as solvent vapors and unreacted raw materials), reducing the load on subsequent processing. Then the gas enters the absorption tower, which is filled with NaOH or Ca(OH)2 solution to neutralize HCl and Cl2, reacting to generate NaCl / CaCl2, with gas and liquid in countercurrent contact.

[0014] Under normal atmospheric pressure, the filter holes and permeation holes of the tray are staggered, making the filter holes smaller. This allows the liquid to be in contact with the gas for a longer period of time, improving the degree of reaction completion.

[0015] When scale buildup from gas-liquid reactions causes filter pore blockage, over time, this can lead to flooding at the edge sealing gaps. This increases the pressure at the tray, compressing the gas inside the cylinder. The piston plate moves inward, causing the sliding rod to move as well. This movement gradually aligns the permeable holes with the filter pores, increasing the usable filter pore size and gas throughput. This prevents flooding from causing the device to malfunction.

[0016] Finally, the gas is sent into the catalytic furnace through the gas outlet pipe. Under the action of the noble metal catalyst (Pt / Pd) in the catalytic furnace, organotin and VOCs are decomposed at a low temperature of 200~400℃ into CO2, H2O and SnO2.

[0017] The condensate from the condenser used for cooling is sent to the plate heat exchanger, and then the gas from the absorption tower is sent to the plate heat exchanger for heat exchange to preheat the gas. The preheated gas is then sent into the catalytic furnace for catalysis.

[0018] The beneficial effects of this solution are as follows: This mechanism automatically adjusts the size of the filter holes by air pressure. When the pressure drop is small, it can increase the gas-liquid contact time. When the pressure drop is large, it can increase the size of the filter holes to increase the gas throughput and prevent filter hole blockage, which can easily lead to liquid flooding at the edge sealing gap and prevent long-term operation.

[0019] Furthermore, it also includes a downcomer plate, which is fixedly connected to a sliding rod, and the sliding rod cooperates with the tower body. Sometimes, increasing the filter pore size still leads to flooding; in this case, it is necessary to increase the width of the edge sealing gap to allow gas to pass through.

[0020] Under normal atmospheric pressure, the sliding rod is in the extended state. At this time, the liquid leveling plate is close to the tower body, which makes the edge sealing gap small, allowing more liquid and gas to pass through the filter holes and increasing the gas-liquid contact area.

[0021] When the pressure at the tray increases, the sliding rod will retract, causing the downcomer to retract as well, which increases the edge sealing gap, allowing more liquid to flow out and preventing flooding.

[0022] Furthermore, it also includes a bag filter, with the condenser, bag filter, absorption tower, and catalytic furnace connected in sequence. One reason why the absorption tower trays are prone to clogging is because the gas contains solid particulate impurities, thus requiring a device to remove these impurities. The bag filter can remove solid particles from the gas, preventing the gas from carrying solid particles into the absorption tower and causing blockage of the filter pores in the trays.

[0023] Furthermore, the tray is rotatably connected to the absorber via a torque spring. In the event of flooding, it is generally necessary to increase the edge sealing gap or the filter holes to allow more gas to pass through. The rotation of the tray increases the width of the edge sealing gap. The tray's rotation angle is -5° to 5°, and the torque spring is installed at the connection between the tray and the absorber, allowing the tray to rotate freely within a certain range. When subjected to external forces (such as changes in gas pressure), the tray can automatically adjust its angle to optimize gas-liquid distribution.

[0024] Furthermore, a return spring is included, one end of which is fixedly connected to the cylinder body, and the other end is fixedly connected to the piston plate. When the external air pressure returns to atmospheric pressure, the return spring can use its elastic potential energy to push the piston plate back to its initial position. This ensures that the sliding rod and its through hole can automatically return to the preset state, providing consistent operating conditions.

[0025] Furthermore, it also includes a connecting pipe that mates with the tray, and the connecting pipe is equipped with a solenoid valve. The inlet end of the connecting pipe is located in the high-pressure zone above the tray, and the outlet end is located in the low-pressure zone below the tray, with the outlet end inclined downwards to impact and vibrate the tray below. Each tray is equipped with a connecting pipe, with the outlet end not higher than the tray above it and the inlet end not lower than the tray below it.

[0026] When flooding is detected on a tray, the operator simply needs to open the solenoid valve to connect the connecting pipe. Gas will then flow through the connecting pipe across the tray, effectively rendering the tray inoperable and resolving the flooding issue. Furthermore, the gas will impact the tray under pressure, causing it to vibrate up and down due to the torque spring, dislodging any blockages or impurities.

[0027] Once flooding is resolved, the operator only needs to close the solenoid valve to restore the tray's function.

[0028] Furthermore, a metal contact switch is installed inside the cylinder. This metal contact switch is electrically connected to the solenoid valve and cooperates with a piston plate made of ferromagnetic material. Previously, manually opening the solenoid valve each time was very cumbersome. In this solution, when the pressure is too high, the piston plate will touch the metal contact switch, causing the solenoid valve to open, thus opening the connecting pipe. Gas can then flow through the connecting pipe past the tray, effectively rendering the tray ineffective and resolving flooding at that point. This mechanism achieves automated opening and closing of the solenoid valve through the cooperation of an electromagnet and a metal contact switch.

[0029] Furthermore, it also includes a pressure detection mechanism and a buzzer. The pressure detection mechanism is used to detect the total pressure inside the tower. The pressure detection mechanism is electrically connected to the buzzer, which is located outside the tower. Excessive pressure in the absorption tower can damage the equipment, so a device capable of real-time pressure monitoring is needed. In this solution, when the overall pressure inside the absorption tower reaches a set value, the pressure detection mechanism will control the buzzer to sound an alarm, notifying the operator to take action. This mechanism, through the buzzer alarm, can promptly notify staff to handle the situation, minimizing losses caused by excessive pressure. Attached Figure Description

[0030] Figure 1 This is a structural diagram of a waste gas treatment device for the production of methyltin chloride.

[0031] Figure 2 This is a cross-sectional view of an absorption tower in a waste gas treatment device for the production of methyltin chloride.

[0032] Figure 3 This is a diagram showing the initial state of the absorption tower in a waste gas treatment device for the production of methyltin chloride.

[0033] Figure 4 This is a diagram showing the increasing pressure in the absorption tower of a waste gas treatment device for the production of methyltin chloride.

[0034] The reference numerals in the accompanying drawings include: 1. Condenser; 2. Baghouse dust collector; 3. Absorption tower; 4. Catalytic furnace; 5. Outlet pipe; 6. Tower body; 7. Connecting pipe; 8. Solenoid valve; 9. Inlet pipe; 10. Tower plate; 11. Liquid inlet pipe; 12. Metal contact switch; 13. Filter hole; 14. Cylinder body; 15. Return spring; 16. Piston plate; 17. Sealing ring; 18. Through hole; 19. Sliding rod; 20. Downcomer plate; 21. Torque spring; 22. Edge sealing gap. Detailed Implementation

[0035] As attached Figure 1 As shown:

[0036] The waste gas treatment device for the production of methyltin chloride of the present invention includes a condenser 1, a bag filter 2, an absorption tower 3, a catalytic furnace 4, and a plate heat exchanger connected in sequence. The waste gas treatment process is as follows: Condensation and recovery stage: The waste gas first enters the condenser 1, and volatile organic compounds (such as toluene and unreacted methyltin compounds) are recovered through low-temperature condensation (0~5℃); Dust removal stage: The condensed gas passes through the bag filter 2 to remove particulate matter (such as tin compound dust); Absorption and neutralization stage: The gas enters the absorption tower 3 and comes into countercurrent contact with the NaOH solution sprayed inside the tower to neutralize acidic gases such as HCl and Cl2; Catalytic decomposition stage: The purified gas is preheated by the plate heat exchanger and then enters the catalytic furnace 4, where organotin compounds and residual VOCs are decomposed under the action of a catalyst; Heat recovery: The cooling water of the condenser 1 exchanges heat with the gas inlet of the catalytic furnace 4 through the plate heat exchanger to preheat the gas and reduce the energy consumption of the catalytic furnace 4.

[0037] As attached Figure 2 , Figure 3 As shown:

[0038] The absorption tower 3 is equipped with an inlet pipe 11, an outlet pipe, an inlet pipe 9, and an outlet pipe 5. Each of these pipes is equipped with a one-way valve. The absorption tower 3 contains multiple layers of equally spaced, staggered trays 10, initially tilted downwards at 5° (based on the tower's axis). This angle prevents liquid accumulation near the cylinder 14, thus preventing liquid from entering the cylinder 14. Each tray 10 is rotatably connected to the tower body 6 via a torque spring 21, allowing the tray 10 to adaptively adjust its angle within a range of -5° to 5°. The gap between the tray 10 and the tower body 6 is designed as an adjustable sealing structure. When the filter holes 13 become clogged, the gap is filled with liquid, forming a localized seal, causing the pressure at the tray 10 to increase.

[0039] The gap between the tray 10 and the tower body 6 is dynamically adjusted by the lateral movement of the sliding rod 19. When the filter hole 13 becomes clogged, flooding can easily occur. After flooding, the pressure at the tray 10 increases, pushing the piston plate 16 to compress the gas in the cylinder 14, causing the sliding rod 19 to move laterally. This fills the gap with liquid, forming a local seal, while the through hole 18 gradually aligns with the filter hole 13, increasing the gas flow rate. When the pressure difference returns to normal, the return spring 15 pushes the piston plate 16 back to its original position, and the gap returns to its initial state.

[0040] Explanation of the physical mechanism of flooding seal:

[0041] When filter pore 13 becomes clogged, causing an increase in the pressure differential at tray 10, the flow rate of liquid through filter pore 13 decreases, and liquid accumulates on the surface of tray 10. When local flooding occurs in tray 10 due to filter pore 13 blockage, the gap between tray 10 and the tower body 6 is dynamically adjusted to the micrometer level (0.1-0.5 mm) by the lateral movement of sliding rod 19. After liquid accumulation, it forms a liquid film under surface tension, filling the gap and forming a local seal. The rotation angle (±5°) of tray 10 is only used to optimize gas-liquid distribution in the non-flooding state. During flooding, the gap size is locked by the lateral displacement of sliding rod 19 to ensure the effectiveness of the seal. This sealing state is achieved through the following two points:

[0042] Hydrostatic pressure effect: During flooding, the liquid layer height above tray 10 increases, and the hydrostatic pressure pushes the liquid into the gap;

[0043] Surface tension effect: The difference in wettability of liquid (such as NaOH solution) between the metal tower body (6) and the tray (10) material (such as polytetrafluoroethylene) promotes the stable filling of the gap by the liquid film.

[0044] In the simulated flooding experiment, when the pressure difference of the tray (10) reaches 5 kPa, the liquid filling rate in the gap reaches 95%, and the sealing effect is significant.

[0045] By adjusting the gap size (0.3mm is the optimal value), both the gas-liquid contact efficiency under normal operating conditions and the ability to quickly form a seal in case of flooding can be ensured.

[0046] During flooding, the liquid fills the gaps, forming a sealing layer that prevents gas from escaping directly through the gaps, forcing the gas to pass through the filter hole 13 or the connecting pipe 7.

[0047] The liquid film seal causes the pressure difference at tray 10 to increase further, which pushes the piston plate 16 to compress the gas in cylinder 14 and drives the sliding rod 19 to move laterally.

[0048] After the sliding rod 19 moves, the through hole 18 aligns with the filter hole 13, increasing the gas flow. At the same time, the liquid-reducing plate 20 retracts to widen the edge sealing gap 22, thus mitigating flooding through a dual mechanism.

[0049] It also includes a sliding rod 19, a cylinder 14, and a piston plate 16. The tower plate 10 has multiple filter holes 13, which are equidistant from each other and have a transverse groove in the middle. The sliding rod 19 is installed in the transverse groove, and the sliding rod 19 has a through hole 18 that is offset from the filter hole 13. During normal operation, the filter hole 13 and the through hole 18 only partially overlap, which limits the gas passing speed and prolongs the gas-liquid contact time. The sliding rod 19 is made of corrosion-resistant material.

[0050] The cylinder body 14 is located inside the tower plate 10. The piston plate 16 is slidably and sealingly connected to the cylinder body 14. The piston plate 16 is fixedly connected to the sliding rod 19. A sealing ring 17 is provided at the sliding point between the sliding rod 19 and the cylinder body 14 to enhance the seal.

[0051] One end of the return spring 15 is fixedly connected to the cylinder body 14, and the other end is fixedly connected to the piston plate 16. When the external air pressure returns to atmospheric pressure, the return spring 15 can use its elastic potential energy to push the piston plate 16 back to its initial position. This ensures that the sliding rod 19 and its through hole 18 can automatically return to the preset state, providing consistent operating conditions.

[0052] When filter orifice 13 becomes clogged, less liquid flows through the channel, increasing the likelihood of flooding in the edge sealing gap 22 between tray 10 and tower body 6. Flooding indirectly increases the pressure drop between the upper and lower trays. When filter orifice 13 becomes clogged, causing an increase in the pressure differential of tray 10, gas pressure pushes piston plate 16 to compress the gas in cylinder 14, causing sliding rod 19 to move laterally. This gradually aligns the through hole 18 with filter orifice 13, expanding the effective through-hole area and preventing flooding.

[0053] The downcomer 20 is linked to the sliding rod 19, which is fixedly connected to the downcomer 20. When the pressure difference increases, the sliding rod 19 retracts, causing the downcomer 20 to retract as well, increasing the width of the edge sealing gap 22, accelerating the downward flow of liquid, and preventing liquid accumulation. The edge sealing gap 22 is formed by the gap between the downcomer 20 and the tower body 6. When the sliding rod 19 retracts, the distance between the downcomer 20 and the tower body 6 increases, and the width of the edge sealing gap 22 increases accordingly, accelerating the downward flow of liquid.

[0054] The inlet of the connecting pipe 7 is located in the high-pressure zone above the tray 10, and the outlet is located in the low-pressure zone below the tray 10. The outlet is tilted downwards, aiming at the lower tray 10 to create impact vibration. Each tray 10 is equipped with a connecting pipe 7, with the outlet not higher than the tray above and the inlet not lower than the tray below. The inlet of the connecting pipe 7 is located in the high-pressure zone above the tray 10, and the outlet is located in the low-pressure zone below. When the solenoid valve 8 is opened, the gas flows through the connecting pipe 7 to balance the pressure difference.

[0055] When flooding cannot be resolved by adaptive adjustment, the pressure will continue to move the piston plate 16, causing it to contact the metal contact switch 12. The metal contact switch 12 triggers the solenoid valve 8 to open, and the gas bypasses the blocked tray 10 through the connecting pipe 7, rendering that tray 10 ineffective. However, the other trays 10 continue to function. Compared to existing mechanisms where flooding of even one tray 10 leads to pressure collapse of the entire tower 6, this mechanism eliminates one tray 10, allowing the absorption tower 3 to continue operating and extending its service life.

[0056] The inclined outlet of the connecting pipe 7 impacts the lower tray 10, and combined with the elasticity of the torque spring 21, causes the tray 10 to vibrate, shaking off blockages. This mechanism can potentially restore the function of the tray 10. The shaking of the tray 10 is achieved through the elastic deformation of the torque spring 21. When the airflow from the connecting pipe 7 impacts the tray 10, it swings around the connecting shaft, causing the filter holes 13 to vibrate and remove scale. The tray 10 and the tower body 6 are rotatably connected by the torque spring 21, and the width of the edge sealing gap 22 is automatically adjusted as the sliding rod 19 moves. The edge sealing gap 22 refers to the gap between the pressure reducing plate 20 and the tower body 6, and the torque spring 21 is located at the connection between the tray and the tower body. When the airflow from the connecting pipe 7 impacts the tray 10, the tray 10 generates high-frequency, small-amplitude vibrations around the torque spring 21. Combined with the scouring effect of the airflow, this effectively removes scale from the filter holes 13. This vibration amplitude has been experimentally verified (amplitude ≤ 0.5 mm) and will not affect the structural stability of the tray 10.

[0057] Pressure detection mechanisms are installed at the bottom and top of the tower body 6 to monitor the pressure differences in the areas where different trays 10 are located. The pressure detection mechanisms monitor the pressure inside the tower body 6 in real time. If the pressure exceeds the set threshold, a buzzer alarm is activated to prompt the operator to check or initiate the emergency procedure.

[0058] As attached Figure 1-4 As shown:

[0059] The principle of this scheme is as follows: condensation and recovery stage: the exhaust gas first enters condenser 1, and volatile organic compounds (such as toluene and unreacted methyltin compounds) are recovered through low-temperature condensation (0~5℃); dust removal stage: the condensed gas passes through bag filter 2 to remove particulate matter (such as tin compound dust).

[0060] Absorption and neutralization stage: Gas enters the absorption tower 3 through the inlet pipe 9 and comes into countercurrent contact with the NaOH solution sprayed inside the tower, neutralizing acidic gases such as HCl and Cl2. Under normal atmospheric pressure, the filter holes 13 and permeation holes 18 of the tower plate 10 are staggered, making the filter holes 13 smaller. This allows the liquid to be in contact with the gas for a longer time, improving the degree of reaction completion. At the same time, under normal atmospheric pressure, the sliding rod 19 is in the extended state. At this time, the downcomer 20 is close to the tower body 6, making the edge sealing gap 22 smaller, allowing more liquid and gas to pass through the filter holes 13, increasing the gas-liquid contact area.

[0061] When the filter hole 13 of a certain tray 10 becomes blocked, the pressure at that tray 10 increases, compressing the gas inside the cylinder 14. The piston plate 16 moves inward, causing the sliding rod 19 to move. The sliding rod 19 moves, gradually aligning the through hole 18 with the filter hole 13, increasing the usable filter hole 13 and increasing the gas flow rate, preventing flooding that could cause the device to malfunction. Simultaneously, when the pressure at the tray 10 increases, the sliding rod 19 retracts, causing the downcomer 20 to retract, increasing the edge sealing gap 22 and allowing more liquid to flow out, preventing flooding. The remaining trays 10 remain unchanged if the pressure does not increase. In this design, the pressure at each tray 10 is different when flooding occurs. The inlet of the connecting pipe 7 is located above the tray 10 (high-pressure zone), and the outlet is located in the low-pressure zone of the lower tray 10. Due to the countercurrent effect of gas and liquid in the absorption tower 3, the pressure of the bottom plate 10 is significantly higher than that of the top plate due to the static pressure of the liquid column and the gas compression effect, forming a pressure gradient from bottom to top.

[0062] When the pressure continues to increase even when the filter holes 13 of the tray 10 have reached their maximum flow rate, the piston plate 16 will continue to move and contact the metal contact switch 12. The metal contact switch 12 will then open the solenoid valve 8, connecting the connecting pipe 7. Gas will then flow through the connecting pipe 7 across the tray 10, effectively rendering the tray 10 ineffective and resolving the flooding issue. Simultaneously, the gas exiting from the outlet will purge the tray 10, causing it to agitate and dislodge impurities from the filter holes 13.

[0063] As the connecting pipe 7 is connected, the pressure below the tray 10 gradually recovers, causing the piston plate 16 to return to its original position under the action of the return spring 15, and the solenoid valve 8 closes. If the scale is cleaned off by shaking the filter holes 13 of the tray 10, then the tray 10 can work normally again.

[0064] Catalytic decomposition stage: The purified gas is preheated by a plate heat exchanger and then enters the catalytic furnace 4, where it decomposes organotin compounds and residual VOCs under the action of a catalyst; Heat recovery: The cooling water of the condenser 1 exchanges heat with the gas inlet of the catalytic furnace 4 through a plate heat exchanger to preheat the gas and reduce the energy consumption of the catalytic furnace 4.

[0065] The beneficial effects of this scheme are as follows: 1. By recovering the heat energy in the condenser 1 and sending the preheated gas back into the catalytic furnace 4 for catalysis, the energy consumption of the catalytic furnace 4 can be reduced. 2. This mechanism automatically adjusts the size of the filter holes 13 by adjusting the gas pressure. When the pressure drop is small, the gas-liquid contact time can be increased; when the pressure drop is large, the size of the filter holes 13 can be increased to increase the gas throughput and prevent flooding. 3. This scheme can also simultaneously adjust the size of the edge sealing gap 22 to further prevent flooding. 4. If the pressure on a tray 10 continues to increase after the above two adjustments, the connecting pipe 7 will be connected. By eliminating the function of one tray 10, the entire system is prevented from collapsing. At the same time, the gas will purge the tray 10 through the connecting pipe 7, causing the tray 10 to shake up and down under the action of the torque spring 21, shaking off the blockage impurities. This may restore the function of the tray 10.

[0066] The above are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A waste gas treatment device for the production of methyltin chloride, comprising: Condenser (1): Used for condensing and recovering organic matter; Absorption tower (3): Multiple tower plates (10) are provided, and the multiple tower plates (10) are staggered at equal intervals in the tower body (6). The tower plates (10) are provided with multiple filter holes (13). Catalytic furnace (4): used for heating and catalytic recovery of organic matter; The condenser (1), the absorption tower (3), and the catalytic furnace (4) are connected in sequence; Plate heat exchanger: One end of the plate heat exchanger is connected to the condenser (1), and the other end is connected to the gas outlet pipe (5) of the absorption tower (3). Its characteristic is that it further includes: The tower plate (10) is provided with a transverse groove, the sliding rod (19) is slidably and sealed to the transverse groove, the sliding rod (19) is provided with a plurality of through holes (18), the through holes (18) are matched with filter holes (13), the cylinder (14) is disposed inside the tower plate (10), the piston plate (16) is slidably and sealed to the cylinder (14), and the piston plate (16) is fixedly connected to the sliding rod (19). It also includes a downcomer plate (20), which is fixedly connected to a sliding rod (19), and an edge sealing gap (22) is formed between the downcomer plate (20) and the inner wall of the tower body (6). It also includes a return spring (15), one end of which is fixedly connected to the cylinder body (14) and the other end is fixedly connected to the piston plate (16); It also includes a connecting pipe (7), which is equipped with a solenoid valve (8). The inlet end of the connecting pipe (7) is located in the high-pressure area above the tower plate (10), and the outlet end is located in the low-pressure area below the tower plate (10). The cylinder (14) is provided with a metal contact switch (12), which is electrically connected to the solenoid valve (8) and the metal contact switch (12) cooperates with the piston plate (16), which is a piston plate (16) made of ferromagnetic material. When the filter hole (13) of a certain tray (10) is blocked, the pressure at that tray (10) will increase, which will compress the gas in the cylinder (14) and drive the sliding rod (19) to move, so that the through hole (18) and the filter hole (13) gradually align. At the same time, the downcomer (20) will retract, which will increase the edge sealing gap (22). When the pressure is too high, the piston plate (16) contacts the metal contact switch (12), which causes the solenoid valve (8) to open, the connecting pipe (7) to connect, and the gas passes through the tray (10) from the connecting pipe (7).

2. The waste gas treatment device for the production of methyltin chloride according to claim 1, characterized in that, It also includes a bag filter (2), and the condenser (1), bag filter (2), absorption tower (3) and catalytic furnace (4) are connected in sequence.

3. The waste gas treatment device for producing chlorinated methyl tin according to claim 1, characterized in that, The tower plate (10) and the absorption tower (3) are rotatably connected by a torque spring.

4. The waste gas treatment device for producing chlorinated methyl tin according to claim 1, characterized in that, It also includes a pressure detection mechanism and a buzzer. The pressure detection mechanism is used to detect the total pressure inside the tower body (6). The pressure detection mechanism is electrically connected to the buzzer, which is located outside the tower body (6).

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