A system and method for controlling a multi-stage chlorination reaction based on photochlorination of chloromethylbenzene

Abstract

This invention relates to the field of chlorination equipment technology, and in particular to a staged chlorination reaction system and control method based on photo-chlorinated chlorotoluene synthesis. The system includes an angle control component and a primary reaction tank assembly. A first pusher component is installed inside the primary reaction tank assembly. A secondary reaction tank assembly is installed at the lower end of the primary reaction tank assembly. A second pusher component is installed inside the secondary reaction tank assembly. A tertiary reaction tank assembly is installed at the lower end of the second pusher component. A third pusher component is installed inside the tertiary reaction tank assembly. The secondary reaction tank assembly includes a second tank body with a material inlet at the top and a first slow-flow hole at the bottom. In this invention, the device uses a segmented scraping-wall material transfer method, replacing traditional overflow and pump conveying. This significantly reduces residue on the inner wall of the tank, improves raw material collection and utilization, avoids material waste and side reactions, and reduces equipment cleaning difficulty and maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of chlorination equipment technology, specifically to a staged chlorination reaction system and control method based on photo-chlorinated chlorotoluene synthesis. Background Technology

[0002] Photochlorotoluene refers to the synthetic process in which toluene, as a raw material, undergoes a free radical chain substitution reaction with chlorine under ultraviolet light or other light conditions. This reaction gradually and selectively replaces hydrogen atoms on the methyl side chain of toluene with chlorine atoms, thereby generating a series of chlorotoluene compounds such as benzyl chloride, benzyl dichlorochloride, and benzyl trichlorochloride. The reaction uses light as an initiator and does not require the addition of additional free radical initiators. By controlling parameters such as light intensity, chlorine gas flow rate, reaction temperature, and time, it is possible to prepare target products with different degrees of chlorination in stages with high selectivity.

[0003] The staged chlorination reactor for the photo-chlorination of toluene is a complete set of reaction equipment that uses toluene as raw material and reacts with chlorine under light conditions to produce benzyl chloride products through multi-stage, stepwise side-chain chlorination. It typically consists of multi-stage series or segmented photo-chlorination reactors, a light system, a chlorine supply system, a temperature and level control system, a tail gas treatment and product separation unit, etc. By controlling the chlorination depth, light intensity, chlorine flow rate and reaction temperature in stages, it can achieve the staged and highly selective synthesis of different chlorinated products such as monochlorobenzyl and dichlorobenzyl from toluene.

[0004] In existing technologies, each stage is an independent reactor. Liquid materials flow out from one stage and into the next, with segmented control and progressive chlorination occurring in different tanks. When liquid materials are transferred to another tank, continuous flow is usually achieved by series overflow or pump delivery. However, this flow method easily produces liquid residue on the inner wall of the tank, increasing the material collection rate and the difficulty of subsequent cleaning. Therefore, to address the above problems, a staged chlorination reaction system and control method based on photochlorination of chlorotoluene is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a staged chlorination reaction system and control method based on photochlorotoluene synthesis, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A staged chlorination reaction system for the photo-chlorinated chlorotoluene synthesis includes an angle control component and a primary reaction vessel assembly. A first pusher component is installed inside the primary reaction vessel assembly. A secondary reaction vessel assembly is installed at the lower end of the primary reaction vessel assembly. A second pusher component is installed inside the secondary reaction vessel assembly. A tertiary reaction vessel assembly is installed at the lower end of the second pusher component. A third pusher component is installed inside the tertiary reaction vessel assembly. The secondary reaction vessel assembly includes a second tank body with a feed port at its top and a first slow-flow hole at its bottom. An internal column is fixedly connected to the second tank body near the top of the first slow-flow hole. A second slow-flow hole is located inside the internal column. A second fluororubber sealing ring is fixedly connected to the upper end of the internal column. The second pusher component includes a second pusher plate with a third fluororubber sealing ring fixedly connected to its outer side. A column groove is located inside the second pusher plate, and a one-way valve is fixedly connected to the upper end of the column groove.

[0008] As a further optimization of the present invention, the angle control component includes a bracket, a workbench is fixedly connected to the right side of the bracket, and a gap is provided between the workbench and the three-stage reaction vessel assembly.

[0009] As a further optimization of the present invention, the bracket is fixedly connected to the housing of the servo motor on the left side, a through hole is provided on the inner side of the bracket, the main shaft of the servo motor rotates inside the through hole of the bracket, a connecting plate is fixedly connected to the end of the main shaft of the servo motor, and a ring frame is fixedly connected to the inner side of the connecting plate by bolts.

[0010] As a further optimization of the present invention, the upper ring frame is fixedly connected to the inner side of the first tank, the middle ring frame is fixedly connected to the outer side of the second tank, and the lower ring frame is fixedly connected to the outer side of the three-stage reaction tank assembly.

[0011] As a further optimization of the present invention, the following features are provided: a first air hole and a second air hole are provided at the upper end of the first tank body; a first solenoid valve is fixedly connected to the upper end of both the first air hole and the upper end of both the first air hole and the second air hole; both the first air hole and the second air hole are connected to the inner side of the first tank body; a feeding cylinder is fixedly connected to the front end of the first tank body; a first manual valve is fixedly connected to the front end of the feeding cylinder; the inner side of the feeding cylinder is connected to the inner side of the first tank body; a first pusher plate is embedded in the inner side of the first tank body; and a first fluororubber sealing ring is fixedly connected to the outer side of the first pusher plate.

[0012] As a further optimization of the present invention, the following features are provided: a bottom hole is provided at the lower end of the first tank body; a second solenoid valve is fixedly connected to the lower end of the first tank body near the bottom hole; a reinforcing column is fixedly connected to the bottom end of the first tank body; and the bottom hole is aligned with the valve port of the second solenoid valve.

[0013] As a further optimization of the present invention, the following features are provided: the bottom end of the second solenoid valve is fixedly connected to the bottom end of the second tank body; the bottom end of the reinforcing column is fixedly connected to the top end of the second tank body; the second solenoid valve and the reinforcing column are installed at both the top and bottom ends of the second tank body; the valve port of the second solenoid valve is aligned with the feed port; a second manual valve is fixedly connected to the front end of the second tank body; and the lower end of the second solenoid valve and the reinforcing column are both fixedly connected to the top end of the three-stage reaction tank assembly.

[0014] As a further optimization of the present invention, the first slow-flow hole is connected to the second slow-flow hole, the second slow-flow hole is located at the lower end of the second fluororubber sealing ring, the built-in column is inserted into the column groove, and the outer side of the second fluororubber sealing ring is in contact with the inner side of the column groove.

[0015] As a further optimization of the present invention, the structure of the lower three-stage reaction vessel assembly is the same as that of the two-stage reaction vessel assembly, and the structure of the third pusher assembly is the same as that of the second pusher assembly.

[0016] A control method for a staged chlorination reaction system based on photo-chlorinated chlorotoluene synthesis;

[0017] Step 1: During the synthesis of photochlorotoluene, the first pusher assembly is placed at the top of the feeding cylinder. The two first solenoid valves are closed, and one first manual valve is opened to deliver toluene to the first tank. Then, the valve is closed and another first manual valve is opened to introduce chlorine gas. The heating wires in the first tank, the second tank, and the tertiary reaction tank assembly are heated at a constant temperature. Ultraviolet light passes through the high borosilicate glass tank to irradiate the raw material, generating liquid benzyl chloride. The first solenoid valve, the second solenoid valve, and one second manual valve at the top of the second vent are opened. Pure gas enters through the narrow second vent in the external gas bag. Under the action of gravity, the first pusher plate drives the first fluororubber sealing ring to move slowly downward, scraping off the material on the inner wall of the first tank and discharging it into the second tank. After completion, the corresponding valves are closed, and the reaction continues to generate benzyl chloride.

[0018] Step 2: When transferring benzyl dichloro, start the servo motor to drive the connecting plate and each stage tank to rotate 180 degrees. Open the second manual valve at the front end and the second solenoid valve at the bottom of the three-stage reaction tank assembly. Pure material in the external air bladder enters the first slow flow hole. The second pusher plate moves down under gravity and pushes the material into the column groove through the one-way valve via the third fluororubber sealing ring. After resetting each stage tank, the second pusher plate moves down again to scrape the material. The material enters the three-stage reaction tank assembly after being restricted by the first and second slow flow holes, and continues to react to generate benzyl dichloro. Finally, it is discharged and collected through the second solenoid valve at the bottom.

[0019] Step 3: During maintenance, if a certain stage of the reaction tank is damaged, the tank can be disassembled individually by simply removing the adjacent second solenoid valve, reinforcing column, and connecting bolts between the connecting plate and the ring frame. Each stage of the tank is suspended and supported by the secondary reaction tank assembly, and can be disassembled and adjusted at an angle independently without the need for overall disassembly or raising and lowering of the end tank.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. In this invention, by setting up a first pushing component, a second pushing component and a third pushing component, the device adopts a segmented scraping wall material transfer method to replace the traditional series overflow and pump conveying, which can significantly reduce liquid residue on the inner wall of the tank, improve the collection rate and utilization rate of raw materials and products, avoid waste and side reactions caused by material retention, and greatly reduce the difficulty of subsequent equipment cleaning and maintenance costs.

[0022] 2. In this invention, by setting a second vent, a first slow-flow vent, and a second slow-flow vent, the device can use the gas flow limiting effect to stably control the downward movement speed of the internal moving parts, avoid the parts from rigidly colliding with the tank due to falling too fast, effectively protect the structure of the reaction device, improve the stability and service life of the equipment, and enhance the overall safety of use.

[0023] 3. In this invention, by setting up a secondary reaction tank assembly, a second pusher assembly, and a second solenoid valve, the device achieves an independent and detachable structure for the multi-stage tanks. During maintenance, only the adjacent interfaces and connecting bolts need to be removed to separate the tanks individually. There is no need to disassemble the entire device or use lifting equipment to lift the end tanks, which simplifies the disassembly and maintenance process and significantly improves the convenience of device maintenance and practicality. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the angle control component structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the three-stage reaction vessel assembly structure of the present invention;

[0027] Figure 4 This is a cross-sectional structural diagram of the third feeding component of the present invention;

[0028] Figure 5 This is a cross-sectional structural diagram of the primary reaction vessel assembly of the present invention;

[0029] Figure 6 For the present invention Figure 5 A schematic diagram of the structure at point A;

[0030] Figure 7 This is a cross-sectional structural diagram of the secondary reaction vessel assembly of the present invention;

[0031] Figure 8 For the present invention Figure 7 A schematic diagram of the structure at point B;

[0032] Figure 9 For the present invention Figure 7 A schematic diagram of the structure at point C.

[0033] In the diagram: 1. Angle control component; 11. Bracket; 12. Worktable; 13. Servo motor; 14. Connecting plate; 15. Ring frame;

[0034] 2. Primary reaction vessel assembly; 21. First vessel body; 22. First vent; 23. Second vent; 24. First solenoid valve; 25. Feed cylinder; 26. First manual valve; 27. Bottom hole;

[0035] 3. First pusher assembly; 31. First pusher plate; 32. First fluororubber sealing ring;

[0036] 4. Secondary reaction vessel assembly; 41. Second vessel body; 42. Second solenoid valve; 43. Reinforcing column; 44. Second manual valve; 45. Feed inlet; 46. First flow-retarding orifice; 47. Internal column; 48. Second flow-retarding orifice; 49. Second fluororubber sealing ring;

[0037] 5. Second pusher assembly; 51. Second pusher plate; 52. Third fluororubber sealing ring; 53. Column groove; 54. One-way valve;

[0038] 6. Three-stage reaction vessel assembly; 7. Third pusher assembly. Detailed Implementation

[0039] 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.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] Please see Figures 1-9 The present invention provides a technical solution:

[0042] A staged chlorination reaction system and control method based on photo-chlorinated chlorotoluene synthesis includes an angle control component 1 and a primary reaction vessel component 2. A first pusher component 3 is installed inside the primary reaction vessel component 2. A secondary reaction vessel component 4 is installed at the lower end of the primary reaction vessel component 2. A second pusher component 5 is installed inside the secondary reaction vessel component 4. A tertiary reaction vessel component 6 is installed at the lower end of the second pusher component 5. A third pusher component 7 is installed inside the tertiary reaction vessel component 6. The secondary reaction vessel component 4 includes a second tank body 41, with an opening at the top of the second tank body 41. The second tank 41 has a feed inlet 45, a first slow flow hole 46 at the bottom, an internal column 47 fixedly connected to the second tank 41 near the top of the first slow flow hole 46, a second slow flow hole 48 on the inner side of the internal column 47, a second fluororubber sealing ring 49 fixedly connected to the upper end of the internal column 47, a second pusher assembly 5 including a second pusher plate 51, a third fluororubber sealing ring 52 fixedly connected to the outer side of the second pusher plate 51, a column groove 53 on the inner side of the second pusher plate 51, and a one-way valve 54 fixedly connected to the upper end of the column groove 53.

[0043] As a further implementation of this solution, the angle control component 1 includes a bracket 11. A worktable 12 is fixedly connected to the right side of the bracket 11. A gap is provided between the worktable 12 and the three-stage reaction tank component 6. The left side of the bracket 11 is fixedly connected to the housing of the servo motor 13. A through hole is opened on the inner side of the bracket 11. The main shaft of the servo motor 13 rotates inside the through hole of the bracket 11. A connecting plate 14 is fixedly connected to the end of the main shaft of the servo motor 13. A ring frame 15 is fixedly connected to the inner side of the connecting plate 14 by bolts. Through the above settings, a reasonable gap is reserved, providing sufficient operating space for the independent disassembly, assembly, tilting and adjustment, and subsequent maintenance of the multi-stage tanks. This effectively avoids interference and collision between adjacent structures, improves the overall layout rationality and ease of use of the device, and the bolt fastening connection method facilitates the rapid assembly and disassembly of the multi-stage support structure. With the help of the drive main shaft, the multi-stage tanks can be rotated synchronously and smoothly, improving the operational stability and structural strength of the device, while simplifying the disassembly and assembly process and reducing the maintenance difficulty.

[0044] As a further implementation of this scheme, the first tank 21 is fixedly connected to the inner side of the upper annular frame 15, the middle annular frame 15 is fixedly connected to the outer side of the second tank 41, and the lower annular frame 15 is fixedly connected to the outer side of the three-stage reaction tank assembly 6. Through the above settings, the independent support structure realizes the stable positioning and reliable fixation of each stage of the reaction tank, ensuring that the reactors at each stage are accurately positioned and uniformly stressed during reaction, turning and material transfer, thereby improving the continuity of the multi-stage segmented chlorination reaction and the overall structural stability.

[0045] As a further implementation of this solution, the upper end of the first tank 21 is provided with a first air hole 22 and a second air hole 23. A first solenoid valve 24 is fixedly connected to the upper end of both the first air hole 22 and the upper end of both the second air hole 23. Both the first air hole 22 and the second air hole 23 communicate with the inner side of the first tank 21. A feeding cylinder 25 is fixedly connected to the front end of the first tank 21. A first manual valve 26 is fixedly connected to the front end of the feeding cylinder 25. The inner side of the feeding cylinder 25 communicates with the inner side of the first tank 21. A first pusher plate 31 is embedded and installed inside the first tank 21. The outer side is fixedly connected with a first fluororubber sealing ring 32. Through the above-mentioned configuration, the graded and controllable conveying of materials such as toluene raw materials and chlorine can be realized. The gas entry speed is limited by the narrow-diameter ventilation structure, and the smooth downward movement is achieved in conjunction with the internal moving parts, effectively avoiding impact and collision, and improving the safety and stability of the feeding, reaction and material transfer process. The first pusher plate 31 and the first fluororubber sealing ring 32 are attached to the inner wall of the tank, which can not only ensure the sealing during the movement, but also realize the scraping of materials on the inner wall, further reducing material residue and improving the raw material utilization rate and transfer efficiency.

[0046] As a further implementation of this solution, a bottom hole 27 is provided at the lower end of the first tank 21. A second solenoid valve 42 is fixedly connected to the lower end of the first tank 21 near the bottom hole 27. A reinforcing column 43 is fixedly connected to the bottom end of the first tank 21. The bottom hole 27 is aligned with the valve port of the second solenoid valve 42. Through the above settings, the precise alignment of the valve port can ensure smooth material flow, reduce material residue and leakage risks, improve material transfer efficiency, and facilitate quick disassembly and sealing connection, thereby improving the reliability and ease of operation of the device.

[0047] As a further implementation of this scheme, the bottom end of the second solenoid valve 42 is fixedly connected to the bottom end of the second tank 41, and the bottom end of the reinforcing column 43 is fixedly connected to the top end of the second tank 41. The second solenoid valve 42 and the reinforcing column 43 are installed at both the top and bottom ends of the second tank 41. The valve port of the second solenoid valve 42 is aligned with the feed port 45. The front end of the second tank 41 is fixedly connected to the second manual valve 44. The lower end of the second solenoid valve 42 and the reinforcing column 43 are both fixedly connected to the top end of the three-stage reaction tank assembly 6. Through the above settings, the sealed connection and independent opening and closing control between the tanks at each stage can be realized, which facilitates the segmented control of the chlorination reaction depth and material transfer rhythm, improves the reaction selectivity and operational flexibility, and reduces the risk of material leakage and tail gas emission.

[0048] As a further implementation of this solution, the first slow-flow hole 46 is connected to the second slow-flow hole 48. The second slow-flow hole 48 is located at the lower end of the second fluororubber sealing ring 49. The built-in column 47 is inserted into the column groove 53. The outer side of the second fluororubber sealing ring 49 is fitted with the inner side of the column groove 53. Through the above settings, the diameter matching and sealing fit structure realizes the stable guidance and flow restriction of the internal components, avoids the moving parts from rigidly colliding with the tank due to excessive falling speed, effectively protects the structure of the reaction device, extends the service life of the equipment, and improves the operational safety.

[0049] As a further implementation of this scheme, the structure of the lower three-stage reaction tank assembly 6 is the same as that of the two-stage reaction tank assembly 4, and the structure of the third pusher assembly 7 is the same as that of the second pusher assembly 5. Through the above settings, a unified and modular structural design is adopted, which facilitates processing and manufacturing, assembly and debugging, and interchangeability and maintenance, reduces production and maintenance costs, and ensures that the scraping, conveying and reaction effects of each stage reactor are consistent, thereby improving the overall practicality and stability of the device.

[0050] Workflow: During the photo-chlorination synthesis of chlorotoluene, the first feeding assembly 3 is initially positioned at the top of the feeding cylinder 25. Both first solenoid valves 24 are closed. One of the first manual valves 26 is opened to feed toluene raw material into the first tank 21. After feeding, the first manual valve 26 is closed, and the other first manual valve 26 is opened to feed chlorine gas into the first tank 21. Heating wires are installed inside the first tank 21, the second tank 41, and the tertiary reaction vessel assembly 6. Multiple heating wires maintain a certain temperature. Simultaneously, ultraviolet light is transmitted through the first tank 21 to irradiate the toluene raw material inside. Both the first tank 21 and the second tank 41 are made of high borosilicate glass, allowing for normal photo-chlorination. This causes the raw material inside the first tank 21 to generate liquid benzyl chloride. The first solenoid valve 24 at the top of the second vent 23, the upper second solenoid valve 42, and one of the second manual valves 44 are opened. At this time, the pure chlorine gas inside the external gas bladder... The liquid will enter the first tank 21 through the second vent 23. Since the opening diameter of the second vent 23 is relatively small, the speed at which the liquid enters the first tank 21 from the external air bladder will be limited. As the first pusher plate 31 moves downward under the action of gravity, the first fluororubber sealing ring 32 seals the first tank 21 and the first pusher plate 31, controlling the downward movement speed of the first pusher plate 31. During this process, the first pusher plate 31 and the first fluororubber sealing ring 32 will scrape the liquid benzyl chloride on the inner wall of the first tank 21, causing the benzyl chloride on the inner wall of the first tank 21 to flow downward and flow into the second tank 41 through the upper second solenoid valve 42. One of the second manual valves 44 is used to discharge the air inside the second tank 41 to ensure the effectiveness of the raw material flow inside the first tank 21. After the raw material inside the first tank 21 is delivered, the upper second solenoid valve 42 and the second manual valve 44 are closed, and the reaction is carried out to generate benzyl chloride.

[0051] During the transfer of benzyl dichloroplastin, the servo motor 13 is activated to control the rotation of the connecting plate 14. The connecting plate 14, through multiple annular frames 15, drives the first-stage reaction tank assembly 2 to the third-stage pusher assembly 7 to rotate simultaneously. After rotating 180 degrees, the second manual valve 44 at the front end of the third-stage reaction tank assembly 6 and the second solenoid valve 42 at the lower end are opened. At this time, the pure material in the external airbag enters the first slow-flow hole 46 through the third-stage reaction tank assembly 6 and the lower second solenoid valve 42. Under the gravity of the second pusher plate 51, the second pusher plate 51 moves downward. Through the seal of the third fluororubber sealing ring 52, the benzyl dichloroplastin material inside the second tank 41 enters the column groove 53 through the one-way valve 54. When the servo motor 13 is activated, the first-stage reaction tank assembly 2 to the third pusher assembly 7 resets. At this time, the second pusher plate 51 moves downward again under the gravity. The second pusher plate 51 and the third fluororubber sealing ring 52 push the material again, and at the same time scrape the material downward on the inner wall of the second tank 41. When valve 54 is closed, the raw material falls onto the third pusher assembly 7 through the second slow-flow hole 48 and the first slow-flow hole 46. The diameter design of the first slow-flow hole 46 and the second slow-flow hole 48 can control the downward movement speed of the second pusher plate 51 until the built-in column 47 enters the column groove 53. At this time, most of the raw material will enter the tertiary reaction tank assembly 6. Then, the second manual valve 44 and the lower second solenoid valve 42 are closed. The raw material reacts with benzyl chloride to generate trichlorobenzyl in the tertiary reaction tank assembly 6. After generation, the trichlorobenzyl in the tertiary reaction tank assembly 6 is discharged from the lower second solenoid valve 42 of the tertiary reaction tank assembly 6 in the same way as the transfer of raw material from the secondary reaction tank assembly 4. This achieves the effect of staged chlorination reaction. This raw material transfer method changes the traditional method of conveying by series overflow or pump, reduces the liquid residue in the tank, improves the raw material collection process, and significantly reduces the difficulty of cleaning the tank later.

[0052] During maintenance, if any of the primary reactor assembly 2, secondary reactor assembly 4, or tertiary reactor assembly 6 is damaged, only the adjacent second solenoid valve 42 and reinforcing column 43 are removed, and the bolts connecting the connecting plate 14 and the ring frame 15 are removed. At this point, one of the tanks can be separated. Simultaneously, the primary reactor assembly 2, secondary reactor assembly 4, and tertiary reactor assembly 6 are suspended in the air through the secondary reactor assembly 4. This facilitates disassembly and assembly and provides convenience for angle control from the primary reactor assembly 2 to the third pusher assembly 7. During maintenance, there is no need to disassemble the entire assembly or use lifting equipment to raise the lowest tertiary reactor assembly 6, which significantly improves the convenience of maintenance and enhances practicality.

[0053] 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. A staged chlorination reaction system based on photochlorotoluene synthesis, comprising an angle control component (1) and a primary reaction vessel component (2), characterized in that: The first-stage reaction tank assembly (2) is equipped with a first pusher assembly (3) inside, the second-stage reaction tank assembly (4) is installed at the lower end of the first-stage reaction tank assembly (2), the second pusher assembly (5) is installed inside the second-stage reaction tank assembly (4), the third-stage reaction tank assembly (6) is installed at the lower end of the second pusher assembly (5), and the third pusher assembly (7) is installed inside the third-stage reaction tank assembly (6). The secondary reaction vessel assembly (4) includes a second vessel body (41), a feed inlet (45) is provided at the top of the second vessel body (41), a first slow flow hole (46) is provided at the bottom of the second vessel body (41), an internal column (47) is fixedly connected to the second vessel body (41) near the top of the first slow flow hole (46), a second slow flow hole (48) is provided on the inner side of the internal column (47), and a second fluororubber sealing ring (49) is fixedly connected to the internal column (47) near the upper end. The second pusher assembly (5) includes a second pusher plate (51), a third fluororubber sealing ring (52) is fixedly connected to the outside of the second pusher plate (51), and a column groove (53) is opened on the inside of the second pusher plate (51). A one-way valve (54) is fixedly connected to the upper end of the column groove (53).

2. The staged chlorination reaction system based on photochlorotoluene synthesis according to claim 1, characterized in that: The angle control component (1) includes a bracket (11), and a workbench (12) is fixedly connected to the right side of the bracket (11). A gap is provided between the workbench (12) and the three-stage reaction vessel component (6).

3. The staged chlorination reaction system based on photochlorotoluene synthesis according to claim 2, characterized in that: The left side of the bracket (11) is fixedly connected to the housing of the servo motor (13). A through hole is provided on the inner side of the bracket (11). The main shaft of the servo motor (13) rotates inside the through hole of the bracket (11). A connecting plate (14) is fixedly connected to the end of the main shaft of the servo motor (13). A ring frame (15) is fixedly connected to the inner side of the connecting plate (14) by bolts.

4. The staged chlorination reaction system based on photochlorotoluene synthesis according to claim 3, characterized in that: The upper ring frame (15) is fixedly connected to the inner side of the first tank (21), the middle ring frame (15) is fixedly connected to the outer side of the second tank (41), and the lower ring frame (15) is fixedly connected to the outer side of the three-stage reaction tank assembly (6).

5. The staged chlorination reaction system based on photochlorotoluene synthesis according to claim 4, characterized in that: The first tank (21) has a first air hole (22) and a second air hole (23) at its upper end. The upper ends of the first air hole (22) and the second air hole (23) are fixedly connected to a first solenoid valve (24). The first air hole (22) and the second air hole (23) are both connected to the inner side of the first tank (21). The front end of the first tank (21) is fixedly connected to a feeding cylinder (25). The front end of the feeding cylinder (25) is fixedly connected to a first manual valve (26). The inner side of the feeding cylinder (25) is connected to the inner side of the first tank (21). The inner side of the first tank (21) is embedded in a first pusher plate (31). The outer side of the first pusher plate (31) is fixedly connected to a first fluororubber sealing ring (32).

6. The staged chlorination reaction system based on photochlorotoluene synthesis according to claim 4, characterized in that: The first tank (21) has a bottom hole (27) at its lower end. A second solenoid valve (42) is fixedly connected to the lower end of the first tank (21) near the bottom hole (27). A reinforcing column (43) is fixedly connected to the bottom end of the first tank (21). The bottom hole (27) is aligned with the valve port of the second solenoid valve (42).

7. The staged chlorination reaction system based on photochlorotoluene synthesis according to claim 6, characterized in that: The bottom end of the second solenoid valve (42) is fixedly connected to the bottom end of the second tank (41), and the bottom end of the reinforcing column (43) is fixedly connected to the top end of the second tank (41). The second solenoid valve (42) and the reinforcing column (43) are installed at both the top and bottom ends of the second tank (41). The valve port of the second solenoid valve (42) is aligned with the feed port (45). The front end of the second tank (41) is fixedly connected to the second manual valve (44). The second solenoid valve (42) and the reinforcing column (43) at the lower end are both fixedly connected to the top end of the three-stage reaction tank assembly (6).

8. The staged chlorination reaction system based on photochlorotoluene synthesis according to claim 1, characterized in that: The first slow flow hole (46) is connected to the second slow flow hole (48). The second slow flow hole (48) is located at the lower end of the second fluororubber sealing ring (49). The built-in column (47) is inserted into the column groove (53). The outer side of the second fluororubber sealing ring (49) is in contact with the inner side of the column groove (53).

9. The staged chlorination reaction system based on photochlorotoluene synthesis according to claim 1, characterized in that: The structure of the lower three-stage reaction vessel assembly (6) is the same as that of the two-stage reaction vessel assembly (4), and the structure of the third pusher assembly (7) is the same as that of the second pusher assembly (5).

10. A method for controlling a staged chlorination reaction system based on photochlorotoluene synthesis according to any one of claims 1-9, characterized in that: Step 1: During the synthesis of photochlorotoluene, the first pusher assembly (3) is placed at the top of the feed cylinder (25), the two first solenoid valves (24) are closed, and a first manual valve (26) is opened to deliver toluene to the first tank (21). Then, the valve is closed and another first manual valve (26) is opened to introduce chlorine gas. The heating wires in the first tank (21), the second tank (41) and the three-stage reaction tank assembly (6) are heated at a constant temperature. Ultraviolet light shines through the high borosilicate glass tank to irradiate the raw material and generate liquid benzyl chloride. The first solenoid valve (24), the second solenoid valve (42) at the top of the second vent (23) and a second manual valve (44) are opened. The pure air in the external air bag enters through the narrow second vent (23) with limited flow. The first pusher plate (31) drives the first fluororubber sealing ring (32) to move slowly down under the action of gravity, scraping off the material on the inner wall of the first tank (21) and discharging it into the second tank (41). After completion, the corresponding valves are closed and the reaction continues to generate benzyl chloride. Step 2: When transferring benzyl dichloro, start the servo motor (13) to drive the connecting plate (14) and each tank to rotate 180 degrees. Open the second manual valve (44) at the front end and the second solenoid valve (42) at the bottom end of the three-stage reaction tank assembly (6). Pure material in the external air bag enters the first slow flow hole (46). The second pusher plate (51) moves down under gravity. The material is pushed into the column groove (53) through the one-way valve (54) by the third fluororubber sealing ring (52). After resetting each tank, the second pusher plate (51) moves down again to scrape the material. The material enters the three-stage reaction tank assembly (6) after being limited by the first slow flow hole (46) and the second slow flow hole (48). It continues to react to generate benzyl dichloro and is finally discharged and collected through the second solenoid valve (42) at the bottom end. Step 3: During maintenance, if a certain level of the reaction tank is damaged, simply remove the connecting bolts of the adjacent second solenoid valve (42), reinforcing column (43), and connecting plate (14) and ring frame (15) to disassemble the tank separately. Each level of the tank is suspended and supported by the secondary reaction tank assembly (4), and can be disassembled and adjusted independently without the need for overall disassembly or lifting of the end tank.

Images