Imidacloprid active compound preparation method and preparation device thereof

Abstract

The invention relates to the technical field of imidacloprid production, and discloses an imidacloprid active compound preparation method and a preparation device thereof.The preparation device comprises a reaction tank, a plurality of supporting legs are fixedly installed on the lower side of the reaction tank, a vertical pipe fixedly penetrates through the upper wall of the reaction tank, a limiting ring is fixedly installed on the vertical pipe, and a rotating pipe movably sleeves the limiting ring; raw materials needing to react are injected into the reaction tank, then the water pump is started, the raw materials in the reaction tank can be conveyed into the water conveying pipe, and then the raw materials pass through the water conveying pipe and then enter the rotating pipe through the vertical pipe, so that the raw materials can enter the connecting pipe through the rotating pipe; the stirring pipes are arranged in the reaction tank, so that raw materials can enter each stirring pipe through the connecting pipe and can be sprayed out through the water outlet, pushing force can be generated, the stirring pipes can be driven to rotate and move, the raw materials in the reaction tank can be stirred, and mutual mixing of the raw materials for reaction can be accelerated.

Description

Technical Field

[0001] This invention relates to the technical field of imidacloprid production, specifically to a method and apparatus for preparing imidacloprid technical material. Background Technology

[0002] Imidacloprid is a highly effective neonicotinoid insecticide with broad-spectrum, high efficiency, low toxicity, low residue, and low resistance to insect resistance. It is safe for humans, livestock, plants, and natural enemies, and has multiple effects including contact, stomach poison, and systemic action. It is mainly used to control piercing-sucking pests such as aphids, whiteflies, leafhoppers, and thrips. However, the production of imidacloprid requires various raw materials to be placed in a reaction tank for processing. Currently, most existing reaction tanks use water pumps for circulating mixing, which results in low mixing efficiency and affects reaction efficiency. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a method and apparatus for preparing imidacloprid technical material, which has the advantage of being able to stir the raw materials in the reaction vessel, thereby accelerating the mixing and reaction of the raw materials. This solves the problem that most reaction vessels rely on water pumps for circulating mixing of raw materials, resulting in low mixing efficiency and affecting reaction efficiency.

[0004] To achieve the goal of agitating the raw materials in the reaction tank and thus accelerating their mixing and reaction, this invention provides the following technical solution: An imidacloprid technical material preparation device includes a reaction tank. Several support legs are fixedly installed on the lower side of the reaction tank. A vertical pipe is fixedly installed through the upper wall of the reaction tank. A limiting ring is fixedly installed on the vertical pipe. A rotating pipe is movably sleeved on the limiting ring. Rotating rings are fixedly installed at both the upper and lower ends of the rotating pipe. The lower side of the upper rotating ring is in contact with the upper side of the limiting ring. A connecting pipe is fixedly installed inside the lower rotating ring. A base plate is fixedly installed at the lower end of the connecting pipe. Several stirring pipes are fixedly connected to the connecting pipe. A circular plate is fixedly installed on each stirring pipe. Three water outlets are opened on the clockwise side wall of each stirring pipe. A water pump is fixedly installed below the reaction tank. The water pump's inlet pipe is fixedly connected to the reaction tank. A water delivery pipe is provided on the water pump and communicates with the internal space of the vertical pipe.

[0005] Preferably, a circular box made of transparent material is fixedly inserted through the wall of the reaction vessel. A movable column is movably inserted through the circular box, and a sealing ring is movably fitted on the movable column. The sealing ring is fixedly inserted through the right wall of the circular box. A water tank is opened inside the movable column, and a water inlet is opened on the inner wall of the water tank. Two telescopic tubes a are fixedly installed on the left inner wall of the circular box. Both telescopic tubes a movably penetrate through the right wall of the circular box. A tension spring is movably connected inside each of the two telescopic tubes a. The left end of each of the two tension springs is fixedly connected to the left inner wall of the circular box. A connecting strip is fixedly installed on the right end of each of the two tension springs. The two connecting strips are fixedly connected to the two telescopic tubes a respectively. A pressure plate is fixedly installed on each of the two connecting strips.

[0006] Preferably, each of the two telescopic tubes a is movably connected with a tension spring, the left end of each tension spring is fixedly connected to the left inner wall of the circular box, and the right end of each tension spring is fixedly installed with a connecting strip. The two connecting strips are respectively fixedly connected to the two telescopic tubes a, and pressure plates are fixedly installed on the two connecting strips.

[0007] Preferably, a connecting box is fixedly connected to the vertical pipe, the water supply pipe of the water pump is fixedly connected to the connecting box, a material box is fixedly installed on the upper side of the connecting box, a sealing ring is fixedly passed through the upper wall of the connecting box, four short strips are fixedly installed on the upper inner wall of the connecting box, a support ring is fixedly installed at the lower end of the four short strips, a circular box is fixedly installed on the support ring, a pressure spring is fixedly installed on the lower inner wall of the circular box, and a baffle plate is fixedly installed at the upper end of the pressure spring.

[0008] Preferably, a telescopic tube b is fixedly installed on the upper side of the circular box, the upper end of the telescopic tube b is fixedly connected to the baffle plate, and a pressure spring is set inside the telescopic tube b.

[0009] Preferably, a horizontal plate is fixedly installed inside the material box, a lifting rod is movably passed through the horizontal plate, a pressure box is movably sleeved on the lifting rod, a movable plug is movably connected inside the pressure box, the movable plug is fixedly connected to the lifting rod, a small tube is fixedly connected to the lower wall of the material box, two small grooves are opened on the small tube, and the lifting rod movably passes through the upper wall of the material box.

[0010] Preferably, a control tube is movably sleeved on the lifting rod, the control tube movably passes through the horizontal plate, the lower end of the control tube is fixedly connected to the upper side of the pressure box, and the control tube movably passes through the upper wall of the material box.

[0011] Preferably, two arc-shaped handles are fixedly installed on the outer wall of the control tube, and a ring handle is fixedly installed on the upper end of the lifting rod.

[0012] The preparation method of imidacloprid technical material is as follows, and the process steps are as follows: Imidacloprid technical grade was synthesized from cyclopentadiene using a solid-state three-light clean production technology. An organic furan composite catalyst was added to continuously produce the intermediate 2-chloro-5-chloromethylpyridine, which was then used to synthesize the imidacloprid technical grade. The reaction formula is as follows: .

[0013] The advantages of this invention are: compared with the prior art, this invention provides a method and apparatus for preparing imidacloprid technical, which has the following beneficial effects: This imidacloprid technical material preparation equipment works by injecting the raw materials to be reacted into a reaction tank, then starting a water pump to transport the raw materials from the reaction tank to a water supply pipe. The raw materials then pass through the water supply pipe and then through a vertical pipe into a rotating pipe. From there, the raw materials enter a connecting pipe, and finally through the connecting pipe into each stirring pipe. The raw materials are then sprayed out through the water outlet, generating a driving force that drives the stirring pipe to rotate and move, thus agitating the raw materials in the reaction tank and accelerating the mixing and reaction of the raw materials.

[0014] This imidacloprid technical material preparation equipment uses a circular box to facilitate the user's inspection of the raw materials inside the reaction tube. By pushing the moving column to the right, the pressure plate moves to the right. When the water inlet on the moving column moves into the reaction tank, the raw materials in the reaction tank will enter the water tank through the water inlet. Then, the moving column can be pulled out to remove the raw materials, allowing the user to easily take out a portion of the raw materials for inspection of the reaction. At the same time, the spring rebound can drive the pressure plate to the left through two connecting strips to fit against the circular box and block the circular box, thus preventing raw material leakage.

[0015] This imidacloprid technical material preparation equipment works by placing the raw materials to be added later into the material box. When it is necessary to add the materials, the baffle plate can be pressed down to connect the space inside the material box with the space inside the connecting box. This allows the raw materials to be added into the connecting box, and the raw materials will then enter the reaction tank with the water flow. When the baffle plate is released, the rebound of the pressure spring will cause the baffle plate to move upward to block the connection between the material box and the connecting box.

[0016] This imidacloprid technical preparation equipment uses a telescopic tube (b) to work with a circular box and a baffle plate to shield and protect the pressure spring. This prevents the reacting raw materials from contacting the pressure spring, thus avoiding corrosion caused by the raw materials and extending the service life of the pressure spring.

[0017] This imidacloprid technical material preparation equipment works by moving the lifting rod upward, which in turn moves the moving plug upward. This allows the raw material in the material box to be sucked into the pressure box through the small tube. Then, the pressure box is moved downward, causing the small tube to pass through the sealing ring and squeeze the baffle plate downward. Finally, pressing the lifting rod forces the raw material to be added in the pressure box into the connecting box. At the same time, the sealing ring prevents the raw material in the connecting box from flowing into the material box.

[0018] 6. This imidacloprid technical preparation equipment allows users to easily control the up and down movement of the control tube via two arc-shaped wrenches, which in turn moves the pressure box up and down. A ring handle allows users to easily move the lifting rod up and down, thus improving the ease of use and practicality of the device. Attached Figure Description

[0019] Figure 1 This is a frontal perspective view of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the internal three-dimensional structure of the reaction vessel; Figure 3 For the present invention Figure 1 A three-dimensional structural diagram of the central vertical pipe; Figure 4 For the present invention Figure 2 A three-dimensional structural diagram of the rotating tube; Figure 5 For the present invention Figure 1 A cross-sectional three-dimensional structural diagram of the connecting box; Figure 6 For the present invention Figure 1 A cross-sectional solid-state structural diagram of the central circular box; Figure 7 For the present invention Figure 5 A three-dimensional structural diagram of the central control tube; Figure 8 For the present invention Figure 5 A magnified schematic diagram of the structure at point A in the middle.

[0020] In the diagram: 1. Reaction vessel; 2. Circular box; 3. Moving column; 4. Water pump; 5. Support leg; 6. Water supply pipe; 7. Vertical pipe; 8. Connecting box; 9. Material box; 10. Rotating tube; 11. Base plate; 12. Water outlet; 13. Circular plate; 14. Stirring tube; 15. Connecting tube; 16. Rotating ring; 17. Limiting ring; 18. Water tank; 19. Sealing ring; 20. Pressure plate; 21. Water inlet; 22. Connecting strip; 23. Tension spring; 24. Telescopic tube a; 25. Pressure box; 26. Horizontal plate; 27. Control tube; 28. Lifting rod; 29. ​​Ring handle; 30. Arc handle; 31. Moving plug; 32. Small tube; 33. Small groove; 34. Sealing ring; 35. Telescopic tube b; 36. Baffle plate; 37. Pressure spring; 38. Circular box; 39. Short strip; 40. Support ring. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings, wherein the same parts are indicated by the same reference numerals. It should be noted that the terms “front”, “rear”, “left”, “right”, “upper” and “lower”, “bottom surface” and “top surface” used in the following description refer to the directions in the drawings, and the terms “inner” and “outer” refer to the directions toward or away from the geometric center of a specific part, respectively.

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1-8This invention provides a technical solution: an imidacloprid technical preparation device, comprising a reaction tank 1, several support legs 5 fixedly installed on the lower side of the reaction tank 1, a vertical pipe 7 fixedly passing through the upper wall of the reaction tank 1, a limiting ring 17 fixedly installed on the vertical pipe 7, a rotating pipe 10 movably sleeved on the limiting ring 17, rotating rings 16 fixedly installed at both the upper and lower ends of the rotating pipe 10, the lower side of the upper rotating ring 16 being in contact with the upper side of the limiting ring 17, a connecting pipe 15 fixedly installed inside the lower rotating ring 16, a base plate 11 fixedly installed at the lower end of the connecting pipe 15, several stirring pipes 14 fixedly connected to the connecting pipe 15, a circular plate 13 fixedly installed on each stirring pipe 14, and three outlets 12 opened on the clockwise side wall of each stirring pipe 14. A water pump 4 is fixedly installed below, and its inlet pipe is fixedly connected to the reaction tank 1. A water delivery pipe 6 is installed on the water pump 4, and the water delivery pipe 6 communicates with the internal space of the vertical pipe 7. By injecting the raw materials to be reacted into the reaction tank 1 and then starting the water pump 4, the raw materials in the reaction tank 1 can be transported to the water delivery pipe 6. The raw materials then pass through the water delivery pipe 6 and then through the vertical pipe 7 into the rotating pipe 10. From there, the raw materials can enter the connecting pipe 15, and then through the connecting pipe 15 into each stirring pipe 14. The raw materials are then sprayed out through the outlet 12, generating a driving force that rotates the stirring pipe 14, thus agitating the raw materials in the reaction tank 1 and accelerating the mixing of the raw materials. The reaction proceeds through a circular box 2 made of transparent material, which is fixedly inserted through the wall of the reaction vessel 1. A movable column 3 extends through the circular box 2, and a sealing ring 19 is movably fitted onto the movable column 3, which is fixedly inserted through the right wall of the circular box 2. A water tank 18 is located inside the movable column 3, and an inlet 21 is located on the inner wall of the water tank 18. Two telescopic tubes a24 are fixedly installed on the left inner wall of the circular box 2, both of which movably penetrate the right wall of the circular box 2. A tension spring 23 is movably connected inside each of the two telescopic tubes a24. The left ends of the two tension springs 23 are fixedly connected to the left inner wall of the circular box 2, and connecting strips 22 are fixedly installed on the right ends of the two tension springs 23. The two connecting strips 22 are respectively fixedly connected to the two telescopic tubes a24, and pressure gauges are fixedly installed on the two connecting strips 22. The force plate 20 and the two telescopic tubes a24 are each movably connected to a tension spring 23. The left ends of the two tension springs 23 are fixedly connected to the left inner wall of the circular box 2, and the right ends of the two tension springs 23 are fixedly installed with connecting strips 22. The two connecting strips 22 are respectively fixedly connected to the two telescopic tubes a24, and pressure plates 20 are fixedly installed on the two connecting strips 22. The circular box 2 allows the user to easily inspect the raw materials in the reaction tube 1. By pushing the moving column 3 to the right, the pressure plate 20 will move to the right. When the water inlet 21 on the moving column 3 moves into the reaction tank 1, the raw materials in the reaction tank 1 will enter the water tank 18 through the water inlet 21. Then, the moving column 3 can be pulled out to remove the raw materials, thus allowing the user to easily remove a portion of the raw materials for inspection of the reaction.Simultaneously, the spring 23 rebounds and, through the two connecting strips 22, drives the pressure plate 20 to move to the left and fit against the round box 2, thus blocking the round box 2 and preventing material leakage. A connecting box 8 is fixedly connected to the vertical pipe 7, and the water supply pipe 6 on the water pump 4 is fixedly connected to the connecting box 8. A material box 9 is fixedly installed on the upper side of the connecting box 8. A sealing ring 34 is fixedly installed through the upper wall of the connecting box 8. Four short strips 39 are fixedly installed on the upper inner wall of the connecting box 8. A support ring 40 is fixedly installed at the lower end of the four short strips 39. A round box 38 is fixedly installed on the support ring 40. A pressure spring 37 is fixedly installed on the lower inner wall of the round box 38. A blocking plate 36 is fixedly installed at the upper end of the pressure spring 37. By placing the material to be added later into the material box 9, it can be pressed down when needed. A baffle plate 36 connects the space inside the material box 9 with the space inside the connecting box 8, allowing the added raw materials to be added into the connecting box 8. The added raw materials then flow into the reaction tank 1 along with the water. When the baffle plate 36 is released, the rebound of the pressure spring 37 causes the baffle plate 36 to move upwards, blocking the connection between the material box 9 and the connecting box 8. A telescopic tube b35 is fixedly installed on the upper side of the circular box 38, with its upper end fixedly connected to the baffle plate 36. The pressure spring 37 is located inside the telescopic tube b35. The telescopic tube b35, together with the circular box 38 and the baffle plate 36, shields and protects the pressure spring 37, preventing the reacting raw materials from contacting it. This prevents the pressure spring 37 from being affected by the raw materials. The influence of the material can lead to corrosion, thus improving the service life of the pressure spring 37. A horizontal plate 26 is fixedly installed inside the material box 9. A lifting rod 28 is movably connected through the horizontal plate 26. A pressure box 25 is movably sleeved on the lifting rod 28. A movable plug 31 is movably connected inside the pressure box 25. The movable plug 31 is fixedly connected to the lifting rod 28. A small tube 32 is fixedly connected to the lower wall of the material box 9. Two small grooves 33 are opened on the small tube 32. The lifting rod 28 movably passes through the upper wall of the material box 9. By moving the lifting rod 28 upward, the movable plug 31 can be moved upward, so that the raw material in the material box 9 can be sucked into the pressure box 25 through the small tube 32. Then, the pressure box 25 is moved downward, so that the small tube 32 passes through the sealing ring 34 and squeezes the baffle plate 36 to move downward. Then, pressing the lifting rod 28 will squeeze the raw material to be added from the pressure box 25 into the connecting box 8. Simultaneously, the sealing ring 34 prevents the raw material in the connecting box 8 from flowing into the material box 9. A control tube 27 is movably sleeved on the lifting rod 28, passing through the horizontal plate 26. The lower end of the control tube 27 is fixedly connected to the upper side of the pressure box 25, and the control tube 27 movably passes through the upper wall of the material box 9. Two arc-shaped handles 30 are fixedly installed on the outer wall of the control tube 27, and a ring handle 29 is fixedly installed on the upper end of the lifting rod 28. The two arc-shaped handles 30 allow the user to easily control the up and down movement of the control tube 27, thereby moving the pressure box 25 up and down. The ring handle 29 allows the user to easily move the lifting rod 28 up and down, making it convenient for the user.This improves the practicality of the device.

[0024] This invention employs a solid-state three-light clean production technology, adding an organic furan composite catalyst to continuously produce the intermediate 2-chloro-5-chloromethylpyridine, and then synthesizing imidacloprid technical material, achieving an imidacloprid technical material content of over 98% and a single-step yield of 92%, which is 7 percentage points higher than the domestic average.

[0025]

[0026] In use, the first step is to inject the raw materials to be reacted into the reaction tank 1, and then start the water pump 4 to transport the raw materials in the reaction tank 1 to the water supply pipe 6. The raw materials will then enter the rotating pipe 10 through the water supply pipe 6 and then through the vertical pipe 7. The raw materials can then enter the connecting pipe 15 through the rotating pipe 10, and then enter each stirring pipe 14 through the connecting pipe 15. The raw materials will then be sprayed out through the water outlet 12, which can generate a driving force to drive the stirring pipe 14 to rotate and move, thereby agitating the raw materials in the reaction tank 1 and accelerating the mixing and reaction of the raw materials.

[0027] Step 2: The round box 2 allows the user to easily inspect the raw materials inside the reaction tube 1. By pushing the moving column 3 to the right, the pressure plate 20 will move to the right. When the water inlet 21 on the moving column 3 moves into the reaction tank 1, the raw materials in the reaction tank 1 will enter the water tank 18 through the water inlet 21. Then, the moving column 3 can be pulled out to remove the raw materials, making it convenient for the user to take out a portion of the raw materials for inspection of the reaction. At the same time, the spring 23 rebounds and can drive the pressure plate 20 to the left through the two connecting strips 22 to fit against the round box 2 and block the round box 2, thus preventing raw material leakage.

[0028] Step 3: By placing the raw materials to be added later into the material box 9, the baffle plate 36 can be pressed down when it is needed to connect the space inside the material box 9 with the space inside the connecting box 8. The raw materials to be added can then be added into the connecting box 8, and the raw materials will enter the reaction tank 1 with the water flow. When the baffle plate 36 is released, the rebound of the pressure spring 37 will cause the baffle plate 36 to move upward and block the connection between the material box 9 and the connecting box 8.

[0029] Step 4: The telescopic tube b35, together with the circular box 38 and the baffle plate 36, can shield and protect the pressure spring 37, thereby preventing the reacting raw materials from contacting the pressure spring 37. This will prevent the pressure spring 37 from being affected by the raw materials and causing corrosion, thus improving the service life of the pressure spring 37.

[0030] Step 5: By moving the lifting rod 28 upward, the moving plug 31 can be moved upward, allowing the raw material in the material box 9 to be sucked into the pressure box 25 through the small tube 32. Then, the pressure box 25 is moved downward, so that the small tube 32 passes through the sealing ring 34 and squeezes the baffle plate 36 downward. Then, pressing the lifting rod 28 will squeeze the raw material to be added in the pressure box 25 into the connecting box 8. At the same time, the sealing ring 34 can prevent the raw material in the connecting box 8 from flowing into the material box 9.

[0031] Step 6: The two arc-shaped wrenches 30 allow the user to easily control the up and down movement of the control tube 27, which in turn drives the pressure box 25 to move up and down. The ring handle 29 allows the user to easily move the lifting rod 28 up and down, thus making it convenient for the user to use and improving the practicality of the device.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An apparatus for preparing imidacloprid technical grade, comprising a reaction vessel (1), wherein a plurality of support legs (5) are fixedly installed on the lower side of the reaction vessel (1), characterized in that: A vertical pipe (7) is fixedly inserted through the upper wall of the reaction vessel (1). A limiting ring (17) is fixedly installed on the vertical pipe (7). A rotating pipe (10) is movably sleeved on the limiting ring (17). Rotating rings (16) are fixedly installed at both the upper and lower ends of the rotating pipe (10). The lower side of the upper rotating ring (16) is in contact with the upper side of the limiting ring (17). A connecting pipe (15) is fixedly installed inside the lower rotating ring (16). A base plate is fixedly installed at the lower end of the connecting pipe (15). 11) Several stirring tubes (14) are fixedly connected to the connecting pipe (15). A circular plate (13) is fixedly installed on each stirring tube (14). Three water outlets (12) are opened on the clockwise side wall of each stirring tube (14). A water pump (4) is fixedly installed below the reaction tank (1). The water inlet pipe of the water pump (4) is fixedly connected to the reaction tank (1). A water delivery pipe (6) is provided on the water pump (4). The water delivery pipe (6) is connected to the internal space of the vertical pipe (7).

2. The apparatus for preparing imidacloprid technical grade according to claim 1, characterized in that: The reaction vessel (1) has a circular box (2) fixedly inserted through its wall. The circular box (2) is made of transparent material. A movable column (3) is inserted through the circular box (2). A sealing ring (19) is movably fitted on the movable column (3). The sealing ring (19) is fixedly inserted through the right wall of the circular box (2). A water tank (18) is opened inside the movable column (3). A water inlet (21) is opened on the inner wall of the water tank (18). Two telescopic tubes a (24) are fixedly installed on the left inner wall of the circular box (2). Both telescopic tubes a (24) are movably inserted through the right wall of the circular box (2). Both telescopic tubes a (24) are movably connected to tension springs (23). The left ends of both tension springs (23) are fixedly connected to the left inner wall of the circular box (2). Both tension springs (23) are fixedly installed on the right ends of both tension springs (23). The two connecting strips (22) are fixedly connected to the two telescopic tubes a (24) respectively. Pressure plates (20) are fixedly installed on the two connecting strips (22).

3. The apparatus for preparing imidacloprid technical grade according to claim 2, characterized in that: Both of the telescopic tubes a (24) are movably connected with tension springs (23). The left ends of the two tension springs (23) are fixedly connected to the left inner wall of the round box (2). The right ends of the two tension springs (23) are fixedly installed with connecting strips (22). The two connecting strips (22) are fixedly connected to the two telescopic tubes a (24) respectively. Pressure plates (20) are fixedly installed on the two connecting strips (22).

4. The apparatus for preparing imidacloprid technical grade according to claim 3, characterized in that: A connecting box (8) is fixedly connected to the vertical pipe (7). The water supply pipe (6) on the water pump (4) is fixedly connected to the connecting box (8). A material box (9) is fixedly installed on the upper side of the connecting box (8). A sealing ring (34) is fixedly passed through the upper wall of the connecting box (8). Four short strips (39) are fixedly installed on the upper inner wall of the connecting box (8). A support ring (40) is fixedly installed at the lower end of the four short strips (39). A circular box (38) is fixedly installed on the support ring (40). A pressure spring (37) is fixedly installed on the lower inner wall of the circular box (38). A baffle plate (36) is fixedly installed at the upper end of the pressure spring (37).

5. The apparatus for preparing imidacloprid technical grade according to claim 4, characterized in that: A telescopic tube b (35) is fixedly installed on the upper side of the circular box (38). The upper end of the telescopic tube b (35) is fixedly connected to the baffle plate (36), and the pressure spring (37) is set inside the telescopic tube b (35).

6. The apparatus for preparing imidacloprid technical grade according to claim 4, characterized in that: A horizontal plate (26) is fixedly installed inside the material box (9). A lifting rod (28) is movably connected through the horizontal plate (26). A pressure box (25) is movably sleeved on the lifting rod (28). A movable plug (31) is movably connected inside the pressure box (25). The movable plug (31) is fixedly connected to the lifting rod (28). A small tube (32) is fixedly connected to the lower wall of the material box (9). Two small slots (33) are opened on the small tube (32). The lifting rod (28) movably passes through the upper wall of the material box (9).

7. The apparatus for preparing imidacloprid technical grade according to claim 6, characterized in that: The lifting rod (28) is movably sleeved with a control tube (27), which movably passes through the horizontal plate (26). The lower end of the control tube (27) is fixedly connected to the upper side of the pressure box (25), and the control tube (27) movably passes through the upper wall of the material box (9).

8. The apparatus for preparing imidacloprid technical grade according to claim 7, characterized in that: Two arc-shaped handles (30) are fixedly installed on the outer wall of the control tube (27), and a ring handle (29) is fixedly installed on the upper end of the lifting rod (28).

9. A method for preparing imidacloprid technical grade is as follows, characterized in that, The following process steps shall be followed: Imidacloprid technical grade was synthesized from cyclopentadiene using a solid-state three-light clean production technology. An organic furan composite catalyst was added to continuously produce the intermediate 2-chloro-5-chloromethylpyridine, which was then used to synthesize the imidacloprid technical grade. The reaction formula is as follows: 。

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