A pressurized reactor for the preparation of 4-chlorobenzophenone

Abstract

The application discloses a pressurized reaction kettle for preparing 4-chlorobenzophenone, and relates to the technical field of 4-chlorobenzophenone preparation, which comprises a kettle body and a conveying assembly, and the conveying assembly is internally arranged in the kettle body. The pressurized reaction kettle for preparing 4-chlorobenzophenone realizes orderly connection and automatic control of three stages of material feeding, pressurizing, stirring and mixing and high-pressure feeding through precise actions of the partition plate lifting linkage hollow rotating shaft, the conveying pipe and other components, solves the problem that it is difficult to feed material due to high gas pressure in a reaction kettle in the prior art, and realizes rapid dispersion of liquid raw material in the kettle body by conveying the liquid raw material to the inside of the kettle body from different height positions to mix with a solution and stir, so that the problem that the purity of a finished product is affected by the increase of by-products due to the rapid increase of local raw material concentration and the feeding rate is improved, and the stability and production efficiency of the 4-chlorobenzophenone pressurized preparation process are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of 4-chlorobenzophenone preparation technology, specifically to a pressurized reaction vessel for the preparation of 4-chlorobenzophenone. Background Technology

[0002] 4-Chlorobenzophenone, as an important organic synthesis intermediate, is widely used in the production processes of fine chemicals such as pharmaceuticals, dyes, and pesticides. The core production process of 4-chlorobenzophenone using a pressure reactor is the pressure Friedel-Crafts acylation reaction process, which uses p-chlorobenzoyl chloride and benzene as raw materials, reacts under high pressure under Lewis acid catalysis, and then undergoes post-processing purification to obtain the finished product. The entire process is adapted to the high pressure and corrosion resistance characteristics of the pressure reactor.

[0003] During production, benzene and anhydrous aluminum trichloride catalyst are first added to a pressurized reactor, and the pressure is slowly increased to 0.8~2.0 MPa and then stirred and mixed evenly. Then, p-chlorobenzoyl chloride is slowly injected through a high-pressure feed pump. The acylation reaction of p-chlorobenzoyl chloride with benzene and aluminum trichloride is exothermic and intense. Therefore, if the existing feeding method is fed too quickly, it will cause a sudden increase in the local raw material concentration. This will lead to the destruction of reaction selectivity due to the excessive intensity of the local reaction, generating byproducts such as polyacylation and isomerization, which will increase the difficulty of subsequent purification and ultimately reduce the purity of the final product. Summary of the Invention

[0004] The purpose of this invention is to provide a pressurized reaction vessel for the preparation of 4-chlorobenzophenone, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pressurized reactor for the preparation of 4-chlorobenzophenone, comprising a reactor body and a conveying assembly. The conveying assembly is installed inside the reactor body. The conveying assembly includes a transfer chamber fixedly installed on the top side of the reactor body. An air compressor is connected to the top of the transfer chamber, and a feeding port is connected to the side of the transfer chamber. A conveying pipe is connected to the bottom of the transfer chamber, and a central channel is axially opened inside the conveying pipe. A pressure-type check valve is provided at the top of the central channel where it connects to the transfer chamber, and a valve-type check valve is provided at the bottom of the central channel. Several bypass ports are radially connected to the side of the central channel, and the bypass ports are located on the inner wall of the annular concave structure of the conveying pipe.

[0006] Furthermore, the conveying pipe is embedded inside the synchronous stirring assembly, which includes a driven gear at the top and a hollow rotating shaft coaxially fixed at the bottom of the driven gear, with the inner diameter of the hollow rotating shaft closely matching the outer diameter of the conveying pipe.

[0007] Furthermore, the synchronous stirring assembly also includes a plug-in switch connected to the bottom end of the hollow rotating shaft cavity. The bottom opening of the plug-in switch is connected to the inner cavity of the vessel, and the plug-in switch opens the valve-type one-way valve when the delivery pipe is at a preset height, so that the top opening is connected to the central channel.

[0008] Furthermore, the synchronous stirring assembly also includes a stirring paddle coaxially fixed to the outside of the hollow rotating shaft. The hollow rotating shaft has several radially connected ports on its side, and the ports are connected to the bypass ports when the conveying pipe is at a preset height.

[0009] Furthermore, the bottom of the vessel is fixed with support legs on both sides, and the bottom of the vessel is connected to a discharge pipe in the middle, and the side of the vessel is connected to a feed pipe.

[0010] Furthermore, a drive assembly is installed inside the vessel body. The drive assembly includes a bracket fixedly installed at the middle of the top of the vessel body. A hydraulic cylinder is bolted to the bracket, and the axis of the extension end of the hydraulic cylinder coincides with the central axis of the vessel body.

[0011] Furthermore, the drive assembly also includes a lifting seat fixedly connected to the extension end of the oil cylinder. Connecting arms are fixedly connected to both sides of the bottom end of the lifting seat, and the two connecting arms are fixed to the partition plate at the end away from the lifting seat. The partition plate is horizontally placed inside the vessel cavity, and the two sides of the partition plate are rotatably engaged with the corresponding hollow rotating shaft through sealing bushings.

[0012] Furthermore, the drive assembly also includes a guide rod that is limited and cooperates with the guide sleeves on both sides of the partition. The guide rod has an "L" shaped structure, and the root of the guide rod is welded and fixed to the side wall of the vessel cavity.

[0013] Furthermore, the drive assembly also includes a drive gear rotatably mounted in the middle of the partition. The drive gear drives the stirring paddles on both hollow rotating shafts to rotate synchronously in opposite directions by meshing with the driven gear, and a key shaft is engaged inside the keyway in the hole of the drive gear.

[0014] Furthermore, the drive assembly also includes a timing belt sleeved on the outside of the pulley at the top of the key shaft. The end of the timing belt opposite to the key shaft is connected to the pulley at the rotating end of the motor for transmission, and the motor is bolted to the top side of the vessel body.

[0015] This invention provides a pressurized reaction vessel for the preparation of 4-chlorobenzophenone, which has the following beneficial effects; 1. The device of this application achieves the orderly connection and automated control of the three stages of feeding and pressurization, stirring and mixing, and high-pressure feeding through the precise movement of components such as the partition lifting linkage hollow rotating shaft and conveying pipe. It not only solves the problem of difficulty in feeding due to the high gas pressure in the reactor in the existing technology, but also enables the rapid dispersion of liquid raw materials in the reactor by conveying liquid raw materials to the inside of the reactor from different height positions to mix and stir with the solution. This improves the feeding rate and avoids the problem of increased by-products caused by a sudden increase in local raw material concentration, which ultimately affects the purity of the finished product. It significantly improves the stability and production efficiency of the pressurized preparation process of 4-chlorobenzophenone.

[0016] 2. This application achieves the simultaneous completion of automatic gas path disconnection and stirring mechanism positioning, which avoids the risk of gas leakage and allows the stirring paddle to sink below the liquid surface. Through gear transmission, the stirring paddle is driven to rotate synchronously in the opposite direction, ensuring uniform mixing of raw materials in the reactor and laying a good foundation for subsequent reactions.

[0017] 3. This application establishes a precise gas delivery path through structural linkage, and uses compressed air to quickly seal and pressurize the vessel, preparing in advance for subsequent high-pressure reaction conditions. It is highly efficient in operation and has strong sealing reliability. The compressed air is also used for subsequent pressurization and delivery of liquid raw materials. The structural design is novel and has strong linkage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention; Figure 2 This is a cross-sectional view of the device of the present invention; Figure 3 This is a schematic diagram of the drive component structure of the present invention; Figure 4 This is a schematic diagram of part of the structure of the device of the present invention; Figure 5 This is a schematic diagram showing the connection between the hollow rotating shaft and the conveying pipe during the feeding and pressurization stage of this invention. Figure 6 This is a schematic diagram of the connection between the hollow rotating shaft and the conveying pipe during the high-pressure feeding stage of this invention; Figure 7 This is a schematic diagram of the synchronous stirring assembly structure of the present invention; Figure 8 This is a schematic diagram of the conveying component structure of the present invention.

[0019] In the diagram: 1. Kettle body; 2. Conveying assembly; 201. Transfer chamber; 202. Air compressor; 203. Feed port; 204. Conveying pipe; 205. Central channel; 206. Pressure check valve; 207. Diaphragm check valve; 208. Bypass port; 3. Synchronous stirring assembly; 301. Driven gear; 302. Hollow rotating shaft; 303. Plug-in switch; 304. Stirring paddle; 305. Connecting port; 4. Support leg; 5. Discharge pipe; 6. Feed pipe; 7. Drive assembly; 701. Bracket; 702. Hydraulic cylinder; 703. Lifting seat; 704. Connecting arm; 705. Partition plate; 706. Guide rod; 707. Drive gear; 708. Key shaft; 709. Synchronous belt; 710. Motor. Detailed Implementation

[0020] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention. Please see Figures 4 to 8 The present invention provides a technical solution: a pressurized reaction vessel for the preparation of 4-chlorobenzophenone, comprising a vessel body 1 and a conveying assembly 2. The conveying assembly 2 is installed inside the vessel body 1. The conveying assembly 2 includes a transfer chamber 201 fixedly installed on the top side of the vessel body 1. An air compressor 202 is connected to the top of the transfer chamber 201, and a feeding port 203 is connected to the side of the transfer chamber 201. A conveying pipe 204 is connected to the bottom of the transfer chamber 201. A central channel 205 is axially opened inside the conveying pipe 204. A pressure-type check valve 206 is provided at the top of the central channel 205 where it connects to the transfer chamber 201, and a valve-type check valve 207 is provided at the bottom of the central channel 205. Several bypass ports 208 are radially connected to the side of the central channel 205, and the bypass ports 208 are located on the inner wall of the annular concave structure of the conveying pipe 204. The specific operation is as follows: During the feeding stage, after the raw materials inside the vessel 1 are evenly mixed, the hydraulic cylinder 702 is activated, further driving the baffle 705 to descend. At this time, the height of the baffle 705 is such that the connecting port 305 on the side of the hollow rotating shaft 302 is connected to the bypass port 208 in the annular recess on the side of the conveying pipe 204. Then, the p-chlorobenzoyl chloride liquid raw material is added to the transfer chamber 201 through the feeding port 203. Afterwards, compressed air generated by the air compressor 202 is introduced above the liquid surface in the transfer chamber 201 to pressurize the liquid raw material until the liquid pressure is greater than the pressure threshold of the pressure-type one-way valve 206 at the connection between the conveying pipe 204 and the transfer chamber 201. At this time, the pressurized liquid raw material can enter the central channel 205 inside the conveying pipe 204 and pass through the bypass port 208 in the annular recess on the side of the conveying pipe 204. The liquid enters through the connecting port 305 at the side end of the hollow rotating shaft 302 and eventually seeps out from different heights below the liquid surface inside the vessel 1. The device of this application achieves the orderly connection and automated control of the three stages of feeding and pressurizing, stirring and mixing, and high-pressure feeding by precisely linking the lifting and lowering of the partition plate 705 with the hollow rotating shaft 302, the conveying pipe 204 and other components. This not only solves the problem of feeding difficulties due to the high gas pressure inside the reactor in the existing technology, but also enables the rapid dispersion of liquid raw materials inside the vessel 1 by conveying liquid raw materials to the inside of the vessel 1 from different heights to mix and stir with the solution. This improves the feeding rate while avoiding the problem of increased byproducts caused by a sudden increase in local raw material concentration, which ultimately affects the purity of the finished product. This significantly improves the stability and production efficiency of the pressurized preparation process of 4-chlorobenzophenone. Please see Figures 4 to 7 The conveying pipe 204 is embedded inside the synchronous stirring assembly 3. The synchronous stirring assembly 3 includes a driven gear 301 at the top, and a hollow rotating shaft 302 is coaxially fixed at the bottom end of the driven gear 301. The inner diameter of the hollow rotating shaft 302 is tightly fitted with the outer diameter of the conveying pipe 204. The synchronous stirring assembly 3 also includes a plug-in switch 303 connected to the bottom end of the cavity of the hollow rotating shaft 302. The bottom opening of the plug-in switch 303 is connected to the inner cavity of the vessel body 1. The plug-in switch 303 is in the pre-positioned position of the conveying pipe 204. When the height is set, the valve type one-way valve 207 is opened so that the top opening is connected to the central channel 205. The synchronous stirring assembly 3 also includes a stirring paddle 304 coaxially fixed to the outside of the hollow rotating shaft 302. Several connecting ports 305 are radially connected to the side of the hollow rotating shaft 302. When the conveying pipe 204 is at the preset height, the connecting ports 305 are connected to the bypass port 208. Support legs 4 are fixed on both sides of the bottom end of the vessel body 1. The bottom middle of the vessel body 1 is connected to the discharge pipe 5. The side end of the vessel body 1 is connected to the feed pipe 6. The specific operation is as follows: During the feeding stage, benzene and anhydrous aluminum trichloride catalyst are added to the pressurized reactor and the reactor body 1 is sealed. At this time, the height of the partition plate 705 is such that the plug-in switch 303 at the bottom of the hollow rotating shaft 302 is inserted and opens the valve-type one-way valve 207 at the bottom of the conveying pipe 204. At the same time, the connecting port 305 on the side of the hollow rotating shaft 302 is offset from the bypass port 208 on the side of the conveying pipe 204, thereby establishing a straight passage from the central channel 205 inside the conveying pipe 204 to the inner cavity of the reactor body 1. At this time, the air compressor 202 is started to send compressed air into the central channel 205 through the empty transfer chamber 201. Finally, the compressed air enters the inner cavity of the reactor body 1 through the valve-type one-way valve 207 at the bottom of the central channel 205, achieving sealing and pressurization inside the reactor body 1. This application establishes a gas delivery passage precisely through structural linkage and uses compressed air to quickly achieve sealing and pressurization of the reactor body 1, preparing in advance for subsequent high-pressure reaction conditions. The operation is efficient and the sealing reliability is strong. Please see Figures 1 to 3 The vessel body 1 is equipped with a drive assembly 7. The drive assembly 7 includes a bracket 701 fixedly installed at the top center of the vessel body 1. A hydraulic cylinder 702 is bolted to the bracket 701, and the axis of the extension end of the hydraulic cylinder 702 coincides with the central axis of the vessel body 1. The drive assembly 7 also includes a lifting seat 703 fixedly connected to the extension end of the hydraulic cylinder 702. Connecting arms 704 are fixedly connected to both sides of the bottom end of the lifting seat 703, and the ends of the connecting arms 704 facing away from the lifting seat 703 are fixed to a partition plate 705. The partition plate 705 is horizontally placed inside the cavity of the vessel body 1, and the two sides of the partition plate 705 are rotatably engaged with the corresponding hollow rotating shaft 302 through sealing bushings. The drive assembly 7 also includes guides on both sides of the partition plate 705. The guide rod 706 is fitted with a limiting fit. The guide rod 706 has an "L" shaped structure and the root of the guide rod 706 is welded and fixed to the side wall of the cavity of the vessel body 1. The drive assembly 7 also includes a drive gear 707 rotatably installed in the middle of the partition plate 705. The drive gear 707 drives the stirring paddle 304 on the hollow rotating shafts 302 on both sides to rotate synchronously in opposite directions through meshing with the driven gear 301. The key shaft 708 is meshed inside the keyway in the hole of the drive gear 707. The drive assembly 7 also includes a synchronous belt 709 sleeved on the outside of the pulley at the top of the key shaft 708. The end of the synchronous belt 709 away from the key shaft 708 is connected to the pulley at the rotating end of the motor 710 for transmission. The motor 710 is bolted to the top side of the vessel body 1. The specific operation is as follows: During the stirring stage, the hydraulic cylinder 702 is activated, and the connecting arms 704 on both sides of the lifting seat 703 drive the baffle 705 to descend inside the vessel body 1. Because the position of the conveying pipe 204 remains unchanged, the hollow rotating shaft 302 rises and falls synchronously with the baffle 705. This not only causes the plug-in switch 303 at the bottom of the hollow rotating shaft 302 to disengage from the valve-type one-way valve 207 at the bottom of the conveying pipe 204, but also causes the valve-type one-way valve 207 to close automatically under the spring reset force, ultimately cutting off the straight path of gas from the central channel 205 to the plug-in switch 303. It also causes the hollow rotating shaft 302 to sink below the liquid surface inside the vessel body 1, preparing for subsequent stirring and mixing. Afterwards, the hydraulic cylinder 702 is activated. The motor 710 drives the key shaft 708 to rotate via the synchronous belt 709. In turn, the key shaft 708 and the keyway in the middle of the partition plate 705 drive the drive gear 707 to rotate. The drive gear 707 further drives the stirring paddles 304 on both hollow rotating shafts 302 to rotate synchronously in opposite directions through meshing with the driven gear 301. This ensures that the raw materials inside the vessel 1 are mixed evenly. This application achieves the synchronous completion of automatic gas path disconnection and stirring mechanism positioning, which avoids the risk of gas leakage and allows the stirring paddles 304 to sink below the liquid surface. The synchronous reverse rotation of the stirring paddles 304 through gear transmission ensures that the raw materials inside the vessel are mixed evenly, laying a good foundation for subsequent reactions.

[0021] In summary, when using a pressurized reactor prepared with 4-chlorobenzophenone: First, during the feeding stage, benzene and anhydrous aluminum trichloride catalyst are added to the pressurized reactor and the reactor body 1 is sealed. At this time, the height of the partition plate 705 allows the plug-in switch 303 at the bottom of the hollow rotating shaft 302 to be inserted and open the valve 207 at the bottom of the conveying pipe 204. At the same time, the connecting port 305 on the side of the hollow rotating shaft 302 is offset from the bypass port 208 on the side of the conveying pipe 204, thereby establishing a straight path from the central channel 205 inside the conveying pipe 204 to the inner cavity of the reactor body 1. At this time, the air compressor 202 is started to send compressed air into the central channel 205 through the empty transfer chamber 201, and finally enters the inner cavity of the reactor body 1 through the valve 207 at the bottom of the central channel 205, achieving sealing and pressurization inside the reactor body 1. This application accurately establishes a gas delivery path through structural linkage and quickly achieves sealing and pressurization of the reactor body 1 using compressed air, preparing in advance for subsequent high-pressure reaction conditions. The operation is efficient and the sealing reliability is strong. Secondly, during the stirring stage, the hydraulic cylinder 702 is activated, and the connecting arms 704 on both sides of the lifting seat 703 drive the baffle 705 to descend within the vessel body 1. Since the position of the delivery pipe 204 remains constant, the hollow rotating shaft 302 rises and falls synchronously with the baffle 705. This not only causes the plug-in switch 303 at the bottom of the hollow rotating shaft 302 to disengage from the valve-type one-way valve 207 at the bottom of the delivery pipe 204, but also causes the valve-type one-way valve 207 to close automatically under the spring's restoring force, ultimately cutting off the straight path of gas from the central channel 205 to the plug-in switch 303. It also causes the hollow rotating shaft 302 to sink below the liquid surface within the vessel body 1, preparing for subsequent stirring and mixing. Afterward, the motor is activated. 710 drives the key shaft 708 to rotate via the synchronous belt 709, which in turn drives the drive gear 707 to rotate through the meshing transmission between the key shaft 708 and the keyway in the middle hole of the drive gear 707 in the partition 705. The drive gear 707 further drives the stirring paddles 304 on both hollow rotating shafts 302 to rotate synchronously in opposite directions through meshing with the driven gear 301, so that the raw materials inside the vessel 1 are mixed evenly. This application realizes the synchronous completion of automatic gas path disconnection and stirring mechanism positioning, which avoids the risk of gas leakage and allows the stirring paddles 304 to sink below the liquid surface. The synchronous reverse rotation of the stirring paddles 304 through gear transmission ensures that the raw materials inside the vessel are mixed evenly, laying a good foundation for subsequent reactions. Finally, during the feeding stage, after the raw materials inside the vessel 1 are evenly mixed, the hydraulic cylinder 702 is activated, further lowering the baffle 705. At this point, the height of the baffle 705 is such that the connecting port 305 on the side of the hollow rotating shaft 302 is connected to the bypass port 208 in the annular recess on the side of the conveying pipe 204. Then, the p-chlorobenzoyl chloride liquid raw material is added to the transfer chamber 201 through the feeding port 203. Afterwards, compressed air generated by the air compressor 202 is introduced above the liquid surface in the transfer chamber 201 to pressurize the liquid raw material until the liquid pressure exceeds the pressure threshold of the pressure-type check valve 206 at the connection between the conveying pipe 204 and the transfer chamber 201. At this point, the pressurized liquid raw material enters the central channel 205 inside the conveying pipe 204 and enters through the bypass port 208 in the annular recess on the side of the conveying pipe 204. The hollow rotating shaft 302 has a connecting port 305 on its side, and the liquid eventually seeps out from different heights below the liquid surface inside the vessel 1. The device of this application achieves the orderly connection and automated control of the three stages of feeding and pressurizing, stirring and mixing, and high-pressure feeding by lifting and linking the hollow rotating shaft 302, conveying pipe 204 and other components through the lifting and lowering linkage of the partition plate 705. This not only solves the problem of feeding due to the high gas pressure inside the reactor in the existing technology, but also enables the rapid dispersion of liquid raw materials inside the vessel 1 by conveying liquid raw materials to the inside of the vessel 1 from different heights to mix and stir with the solution. This improves the feeding rate while avoiding the problem of increased by-products caused by a sudden increase in local raw material concentration, which ultimately affects the purity of the finished product. This significantly improves the stability and production efficiency of the pressurized preparation process of 4-chlorobenzophenone.

[0022] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, and the existence of an infinite number of specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A pressurized reactor for the preparation of 4-chlorobenzophenone, comprising a reactor body (1) and a conveying assembly (2), characterized in that, The vessel body (1) is equipped with a conveying assembly (2). The conveying assembly (2) includes a transfer chamber (201) fixedly installed on the top side of the vessel body (1). The top of the transfer chamber (201) is connected to an air compressor (202), and the side of the transfer chamber (201) is connected to a feeding port (203). The bottom of the transfer chamber (201) is connected to a conveying pipe (204), and a central channel (205) is axially opened inside the conveying pipe (204). A pressure-type check valve (206) is provided at the connection between the top of the central channel (205) and the transfer chamber (201), and a valve-type check valve (207) is provided at the bottom of the central channel (205). Several bypass ports (208) are radially connected to the side of the central channel (205), and the bypass ports (208) are located on the inner wall of the annular concave structure of the conveying pipe (204).

2. The pressurized reaction vessel for preparing 4-chlorobenzophenone according to claim 1, characterized in that, The conveying pipe (204) is embedded inside the synchronous stirring assembly (3). The synchronous stirring assembly (3) includes a driven gear (301) at the top. A hollow rotating shaft (302) is coaxially fixed at the bottom end of the driven gear (301), and the inner diameter of the hollow rotating shaft (302) is tightly fitted with the outer diameter of the conveying pipe (204).

3. The pressurized reaction vessel for preparing 4-chlorobenzophenone according to claim 2, characterized in that, The synchronous stirring assembly (3) also includes a plug-in switch (303) connected to the bottom of the cavity of the hollow rotating shaft (302). The bottom opening of the plug-in switch (303) is connected to the inner cavity of the vessel body (1), and the plug-in switch (303) opens the valve-type one-way valve (207) when the conveying pipe (204) is at a preset height, so that the top opening is connected to the central channel (205).

4. The pressurized reaction vessel for preparing 4-chlorobenzophenone according to claim 3, characterized in that, The synchronous stirring assembly (3) also includes a stirring paddle (304) coaxially fixed to the outside of the hollow rotating shaft (302). The hollow rotating shaft (302) has several connecting ports (305) radially connected on its side, and the connecting ports (305) are connected to the bypass port (208) when the conveying pipe (204) is at a preset height.

5. The pressurized reaction vessel for preparing 4-chlorobenzophenone according to claim 4, characterized in that, The bottom of the vessel (1) is fixed with two support legs (4), and the bottom of the vessel (1) is connected to the middle of the discharge pipe (5), and the side of the vessel (1) is connected to the feed pipe (6).

6. The pressurized reaction vessel for preparing 4-chlorobenzophenone according to claim 5, characterized in that, The vessel body (1) is equipped with a drive assembly (7). The drive assembly (7) includes a bracket (701) fixedly installed at the top middle of the vessel body (1). A hydraulic cylinder (702) is bolted on the bracket (701), and the axis of the extension end of the hydraulic cylinder (702) coincides with the central axis of the vessel body (1).

7. The pressurized reaction vessel for preparing 4-chlorobenzophenone according to claim 6, characterized in that, The drive assembly (7) also includes a lifting seat (703) fixedly connected to the telescopic end of the cylinder (702). The lifting seat (703) has connecting arms (704) fixedly connected to both sides of its bottom end. The two connecting arms (704) are fixed to a partition plate (705) at one end away from the lifting seat (703). The partition plate (705) is horizontally placed inside the cavity of the vessel body (1). The two sides of the partition plate (705) are rotatably engaged with the corresponding hollow rotating shaft (302) through sealing bushings.

8. The pressurized reaction vessel for preparing 4-chlorobenzophenone according to claim 7, characterized in that, The drive assembly (7) also includes a guide rod (706) that is limited and cooperates with the guide sleeves on both sides of the partition (705). The guide rod (706) has an "L" shaped structure, and the root of the guide rod (706) is welded and fixed to the side wall of the cavity of the vessel body (1).

9. The pressurized reaction vessel for preparing 4-chlorobenzophenone according to claim 8, characterized in that, The drive assembly (7) also includes a drive gear (707) rotatably mounted in the middle of the partition (705). The drive gear (707) drives the stirring paddle (304) on the hollow rotating shafts (302) on both sides to rotate synchronously in opposite directions by meshing with the driven gear (301). A key shaft (708) is meshed inside the keyway in the hole of the drive gear (707).

10. The pressurized reaction vessel for preparing 4-chlorobenzophenone according to claim 9, characterized in that, The drive assembly (7) also includes a timing belt (709) sleeved on the outside of the pulley at the top of the key shaft (708). The end of the timing belt (709) away from the key shaft (708) is connected to the pulley at the rotating end of the motor (710) for transmission, and the motor (710) is bolted to the top side of the vessel body (1).

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