Tubular reactor for absorbing 2-fluoro-6-trifluoromethylpyridine tail gas

Abstract

The utility model relates to a tubular reactor for absorbing 2-fluoro-6-trifluoromethylpyridine tail gas, which is applied to the field of reaction equipment and comprises a tubular reactor body, an inner vertical connecting shaft is symmetrically and rotatably connected between the upper inner wall and the lower inner wall of the tubular reactor body, and the outer end of the inner vertical connecting shaft is fixedly connected with a plurality of ring-shaped connecting cylinders. According to the scheme, the telescopic springs, the metal sliding inner blocks and the flow-around hollow fan blades are flexibly connected, and power-on and power-off control of the first electromagnetic inner blocks and the second electromagnetic inner plates is matched, so that the flow-around hollow fan blades are driven to rotate, and the flow-around hollow fan blades are driven to rotate; the contact gap between the device and the inner wall of the reactor can be adjusted, crystals and impurities on the inner wall can be effectively scraped, abrasion of the inner side wall of the reactor body caused by excessive friction is avoided, the scraping mode and the reset state are switched through power-on and power-off of the electromagnetic assembly, impurities are automatically cleaned, and the service life of the device is prolonged.

Description

Technical Field

[0001] This utility model relates to a tubular reactor for tail gas absorption, and more particularly to a tubular reactor for absorbing 2-fluoro-6-trifluoromethylpyridine tail gas, which is applied in the field of reaction equipment. Background Technology

[0002] In the field of chemical production, 2-fluoro-6-trifluoromethylpyridine is an important fluorine-containing intermediate. Its synthesis process generates tail gas containing corrosive gases such as hydrogen chloride and hydrogen fluoride. Direct emission of these gases will seriously pollute the environment and endanger equipment safety.

[0003] Chinese patent CN221386463U discloses a tubular reactor, including a tank and a reaction tube. The tank contains a heat-conducting cavity, and the reaction tube is located inside the heat-conducting cavity. The reaction tube has an inlet and an outlet at its left and right ends, respectively, both of which are connected to the outside of the tank. The reaction tube is composed of several branch tubes connected end-to-end. A flow guide is fixedly connected to the inner wall of one end of each branch tube to ensure uniform mixing of the various components in the material. The flow guide is fixedly connected to the inner wall of the reaction tube, preventing it from being moved and rubbing against the inner wall, thus extending the service life of the components. Furthermore, the fixed connection of the flow guide allows for orderly material flow, helping to propel the material through the reaction tube and improve material output efficiency.

[0004] Fluorine-containing exhaust gases often carry unreacted fluoride particles, which easily crystallize on the inner wall of the equipment after contact with the absorbent liquid, such as calcium fluoride and sodium fluoride. Traditional towers lack an active descaling mechanism on their static inner wall, and the accumulation of crystals over time can lead to a reduction in the flow cross-sectional area and even cause local blockages. Utility Model Content

[0005] The technical problem that this utility model aims to solve in view of the above-mentioned prior art is that fluorine-containing exhaust gas often carries unreacted fluoride particles, which easily form crystals on the inner wall of the equipment after contacting the absorbent liquid, such as calcium fluoride and sodium fluoride. The static inner wall of traditional towers lacks an active descaling mechanism, and the accumulation of crystals will lead to a reduction in the flow cross-sectional area and even cause local blockage.

[0006] To address the aforementioned problems, this utility model provides a tubular reactor for absorbing 2-fluoro-6-trifluoromethylpyridine tail gas, comprising a tubular reactor body. An inner vertical connecting shaft is symmetrically and rotatably connected between the upper and lower inner walls of the tubular reactor body. Multiple ring-shaped connecting cylinders are fixedly connected to the outer end of the inner vertical connecting shaft, and these ring-shaped connecting cylinders are arranged vertically and equidistantly. Hollow fan blades are symmetrically and fixedly connected to the left and right ends of the ring-shaped connecting cylinders. A telescopic spring is fixedly connected to the inner wall of the end of the hollow fan blade closest to the ring-shaped connecting cylinder. A metal sliding inner block is fixedly connected to the end of the telescopic spring furthest from the ring-shaped connecting cylinder. A metal sealing plate is fixedly connected to the end of the metal sliding inner block furthest from the telescopic spring. A conical scraper vertical plate is fixedly connected to the end of the metal sealing plate furthest from the metal sliding inner block. A first electromagnetic inner block is fixedly connected to the inner wall of the end of the hollow fan blade closest to the ring-shaped connecting cylinder. The first electromagnetic inner block and the conical scraper vertical plate are magnetically connected. Second electromagnetic inner plates are symmetrically and fixedly connected to the left and right inner walls of the hollow fan blade.

[0007] In the tubular reactor for absorbing the tail gas of 2-fluoro-6-trifluoromethylpyridine, this design uses a flexible connection between a telescopic spring, a metal sliding inner block, and a hollow fan blade. Combined with the on / off control of the first electromagnetic inner block and the second electromagnetic inner plate, the contact gap between them and the inner wall of the reactor can be adjusted. This effectively scrapes away crystals and impurities from the inner wall while avoiding excessive friction that could cause wear on the inner wall of the reactor body. By switching the scraping mode and reset state through the on / off switching of the electromagnetic components, the cleaning of impurities can be automated, extending the equipment's lifespan.

[0008] As a further improvement of this application, flange connecting plates are symmetrically fixedly connected to the upper and lower ends of the tubular reactor body, and a motor is fixedly connected to the upper end of the flange connecting plate located on the upper side.

[0009] As a further improvement to this application, the output end of the motor is connected to the inner vertical connecting shaft, and multiple flow ports are fixedly connected to the outside of the tubular reactor body.

[0010] As a further improvement of this application, the second electromagnetic inner plate and the metal sliding inner block are magnetically connected, and a sealing surface layer is fixedly connected to one end of the metal sealing plate near the hollow fan blade.

[0011] As another improvement of this application, the sealing surface layer is in contact with the opening of the hollow fan blade, and a wear-resistant protrusion is fixedly connected to the end of the conical scraper plate away from the metal sealing plate.

[0012] As a further improvement to this application, the left and right inner walls of the hollow fan blade are symmetrically provided with side guide grooves, and a guide block is slidably connected between the two side guide grooves.

[0013] As another improvement of this application, the guide inner block is connected to the metal sliding inner block, and the conical scraper vertical plate and the inner wall of the tubular reactor body are in contact with each other.

[0014] In summary, in this design, the motor drives the hollow fan blades to rotate, increasing the gas-liquid contact area through stirring and turbulence, accelerating the reaction rate between harmful components in the exhaust gas and the absorbent, and improving absorption efficiency. The conical scraper blades are flexibly connected to the hollow fan blades via a telescopic spring and a metal sliding inner block. With the on / off control of the first electromagnetic inner block and the second electromagnetic inner plate, the contact gap between the scraper blades and the reactor inner wall can be adjusted. This gap can effectively scrape away crystals and impurities from the inner wall while avoiding excessive friction that could cause wear on the inner wall of the reactor body. By switching the scraping mode and reset state through the on / off switching of the electromagnetic components, the cleaning of impurities can be automated, extending the equipment's lifespan. Attached Figure Description

[0015] Figure 1 This is an isometric view of the tubular reactor body according to the first embodiment of this application;

[0016] Figure 2 This is a schematic diagram of the interior of the tubular reactor body according to the first embodiment of this application;

[0017] Figure 3 This is the first embodiment of the present application. Figure 2 Enlarged view of a partial section of the main body of the tubular reactor;

[0018] Figure 4 This is a schematic diagram of the interior of the hollow fan blade according to the first embodiment of this application.

[0019] Figure 5 This is the first embodiment of the present application. Figure 4 Enlarged view of a partial truncation of a hollow fan blade with a central flow path;

[0020] Figure 6 This is an exploded view of the hollow fan blades surrounding the flow according to the second embodiment of this application;

[0021] Figure 7 This is an enlarged view of the metal sliding inner block according to the first embodiment of this application.

[0022] Explanation of the labels in the diagram:

[0023] 1. Tubular reactor body; 2. Flange connecting plate; 3. Motor; 4. Inner vertical connecting shaft; 5. Ring-shaped connecting cylinder; 6. Hollow fan blades around the flow; 7. Telescopic spring; 8. Side guide groove; 9. Guide inner block; 10. Metal sliding inner block; 11. Conical scraper vertical plate; 12. Metal sealing plate; 13. First electromagnetic inner block; 14. Second electromagnetic inner plate; 15. Sealing surface layer; 16. Wear-resistant convex strip; 17. Flow port. Detailed Implementation

[0024] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0025] First implementation method:

[0026] Figures 1-7 This invention discloses a tubular reactor for absorbing the tail gas of 2-fluoro-6-trifluoromethylpyridine, comprising a tubular reactor body 1. The tubular reactor body 1 is entirely made of Hastelloy C-276 material, which has excellent corrosion resistance and can withstand long-term corrosion. An inner vertical connecting shaft 4 is symmetrically rotatably connected between the upper and lower inner walls of the tubular reactor body 1. Multiple annular connecting cylinders 5 are fixedly connected to the outer ends of the inner vertical connecting shafts 4. The annular connecting cylinders 5 are arranged vertically and equidistantly. Hollow fan blades 6 are symmetrically fixedly connected to the left and right ends of the annular connecting cylinders 5. The hollow fan blades 6 are positioned closer to the annular connecting cylinders 5. A telescopic spring 7 is fixedly connected to the side wall. A metal sliding inner block 10 is fixedly connected to the end of the telescopic spring 7 away from the circular connecting cylinder 5. A metal sealing plate 12 is fixedly connected to the end of the metal sliding inner block 10 away from the telescopic spring 7. A conical scraping vertical plate 11 is fixedly connected to the end of the metal sealing plate 12 away from the metal sliding inner block 10. A first electromagnetic inner block 13 is fixedly connected to the inner side wall of the end of the flow-around hollow fan blade 6 near the circular connecting cylinder 5. The first electromagnetic inner block 13 and the conical scraping vertical plate 11 are magnetically connected. A second electromagnetic inner plate 14 is symmetrically fixedly connected to the left and right inner walls of the flow-around hollow fan blade 6.

[0027] Figures 1-7 The upper and lower ends of the tubular reactor body 1 are symmetrically fixedly connected with flange connecting plates 2. The upper end of the flange connecting plate 2 is fixedly connected with a motor 3. The output end of the motor 3 is connected to the inner vertical connecting shaft 4. Multiple flow ports 17 are fixedly connected to the outer side of the tubular reactor body 1. The second electromagnetic inner plate 14 and the metal sliding inner block 10 are magnetically connected. A sealing surface layer 15 is fixedly connected to the end of the metal sealing plate 12 near the flow-around hollow fan blade 6. The sealing surface layer 15 is in contact with the opening of the flow-around hollow fan blade 6. A wear-resistant ridge 16 is fixedly connected to the end of the conical scraper vertical plate 11 away from the metal sealing plate 12.

[0028] Figures 1-7This illustrates that during the exhaust gas absorption process, after the motor 3 starts, it drives the inner vertical connecting shaft 4 to rotate, causing the annular connecting cylinder 5 and the surrounding hollow fan blade 6 to rotate synchronously. The rotation of the surrounding hollow fan blade 6 stirs the exhaust gas and absorbent inside the tubular reactor body 1. Its special structure induces turbulence by changing the fluid flow direction, significantly increasing the gas-liquid two-phase contact area, accelerating the mass transfer process, and improving the absorption efficiency. One end of the telescopic spring 7 is fixed to the inner wall of the surrounding hollow fan blade 6 near the annular connecting cylinder 5, and the other end is connected to the metal sliding inner block 10. The first electromagnetic inner block 13 is fixed to the wall, forming a magnetic adsorption with the side of the conical scraper vertical plate 11 near the metal sealing plate 12; the second electromagnetic inner plate 14 on the left and right inner walls of the hollow fan blade 6 is magnetically engaged with the outer side of the metal sliding inner block 10. By controlling the on and off of the first electromagnetic inner block 13 and the second electromagnetic inner plate 14, the working state of the conical scraper vertical plate 11 can be adjusted. When it is necessary to clean the inner wall of the reactor, the first electromagnetic inner block 13 is energized to generate magnetism, adsorbing the conical scraper vertical plate 11 to extend outwards towards the hollow fan blade 6, while the second electromagnetic inner plate 14 is de-energized. The magnet releases the metal sliding inner block 10. At this time, the preload of the telescopic spring 7 pushes the metal sliding inner block 10 to slide outward, causing the conical scraper vertical plate 11 to adhere to the inner wall of the tubular reactor body 1. This gap design ensures that the conical scraper vertical plate 11 effectively removes impurities, crystals, or hard lumps attached to the inner wall, while avoiding excessive contact between it and the reactor inner wall. This prevents excessive wear on the inner wall of the tubular reactor body 1 due to long-term friction, thus extending the service life of the reactor while ensuring the cleaning effect. As the hollow fan blade 6 rotates, the conical scraper vertical plate 11 moves with the fan. The blade moves in a circular motion, and the wear-resistant ridge 16 at its tip scrapes away the deposits on the inner wall. The metal sealing plate 12 fits tightly against the opening of the hollow fan blade 6 through the sealing surface layer 15, forming a dynamic sealing structure. When the scraping operation is finished or when reset is required, the first electromagnetic inner block 13 is de-energized and the second electromagnetic inner plate 14 is energized. The metal sliding inner block 10 is pulled back to its initial position by magnetic attraction, and at the same time, the telescopic spring 7 resets and stores energy. During this process, the sealing surface layer 15 always maintains contact with the fan blade opening. With the sealing of the magnetic connection, it prevents the accumulation of deposits inside the fan blade.

[0029] Second implementation method:

[0030] Figure 6 A tubular reactor for absorbing tail gas of 2-fluoro-6-trifluoromethylpyridine is shown. Side guide grooves 8 are symmetrically opened on the left and right inner walls of the hollow fan blades 6. A guide block 9 is slidably connected between the two side guide grooves 8. The guide block 9 is connected to a metal sliding block 10. The conical scraper vertical plate 11 is in contact with the inner wall of the tubular reactor body 1. The metal sliding block 10 and the guide block 9 are connected and can slide along the direction of the groove in the side guide groove 8. The groove limiter ensures the stability of the sliding trajectory and avoids the metal sliding block 10 from deviating, which helps to improve the overall stability.

[0031] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A tubular reactor for absorbing tail gas from 2-fluoro-6-trifluoromethylpyridine, characterized in that: The reactor includes a tubular reactor body (1). An inner vertical connecting shaft (4) is symmetrically rotatably connected between the upper and lower inner walls of the tubular reactor body (1). Multiple ring-shaped connecting cylinders (5) are fixedly connected to the outer end of the inner vertical connecting shaft (4). The multiple ring-shaped connecting cylinders (5) are arranged vertically and equidistantly. Hollow fan blades (6) are symmetrically fixedly connected to the left and right ends of each ring-shaped connecting cylinder (5). A telescopic spring (7) is fixedly connected to the inner wall of the end of each hollow fan blade (6) closest to the ring-shaped connecting cylinder (5). A telescopic spring (7) is fixedly connected to the end of each telescopic spring (7) furthest from the ring-shaped connecting cylinder (5). A metal sliding inner block (10) is fixedly connected to a metal sealing plate (12) at one end away from the telescopic spring (7). A conical scraper vertical plate (11) is fixedly connected to one end of the metal sealing plate (12) away from the metal sliding inner block (10). A first electromagnetic inner block (13) is fixedly connected to the inner wall of the end of the flow-around hollow fan blade (6) near the ring-shaped connecting cylinder (5). The first electromagnetic inner block (13) and the conical scraper vertical plate (11) are magnetically connected. A second electromagnetic inner plate (14) is symmetrically fixedly connected to the left and right inner walls of the flow-around hollow fan blade (6).

2. The tubular reactor for absorbing 2-fluoro-6-trifluoromethylpyridine tail gas according to claim 1, characterized in that: The tubular reactor body (1) is symmetrically fixedly connected to flange connecting plates (2) at both ends, and a motor (3) is fixedly connected to the upper end of the flange connecting plate (2) located on the upper side.

3. The tubular reactor for absorbing 2-fluoro-6-trifluoromethylpyridine tail gas according to claim 2, characterized in that: The output end of the motor (3) is connected to the inner vertical connecting shaft (4), and multiple flow ports (17) are fixedly connected to the outside of the tubular reactor body (1).

4. The tubular reactor for absorbing 2-fluoro-6-trifluoromethylpyridine tail gas according to claim 1, characterized in that: The second electromagnetic inner plate (14) and the metal sliding inner block (10) are magnetically connected, and the metal sealing plate (12) is fixedly connected to a sealing surface layer (15) at one end near the hollow fan blade (6).

5. A tubular reactor for absorbing 2-fluoro-6-trifluoromethylpyridine tail gas according to claim 4, characterized in that: The sealing surface layer (15) is in contact with the opening of the hollow fan blade (6), and a wear-resistant protrusion (16) is fixedly connected to the end of the conical scraper vertical plate (11) away from the metal sealing plate (12).

6. The tubular reactor for absorbing 2-fluoro-6-trifluoromethylpyridine tail gas according to claim 1, characterized in that: The hollow fan blade (6) has symmetrically provided side guide grooves (8) on its left and right inner walls, and a guide block (9) is slidably connected between the two side guide grooves (8).

7. A tubular reactor for absorbing 2-fluoro-6-trifluoromethylpyridine tail gas according to claim 6, characterized in that: The guide inner block (9) is connected to the metal sliding inner block (10), and the conical scraper vertical plate (11) and the inner wall of the tubular reactor body (1) are in contact with each other.

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