Special heating reaction kettle for alkylation reaction of pyrrole nitrile

Abstract

The utility model discloses a special heating reaction kettle for an alkylation reaction of pyrrole nitrile. The reaction kettle comprises a tank body, the tank body is provided with a feeding pipe and a discharging pipe, and a stirring device is arranged in the tank body. The stirring device comprises a driving motor positioned on the upper side of the tank body, and a transmission shaft and a driven shaft in the tank body. The driving motor is firmly connected with the transmission shaft, the driven shaft is connected with the transmission shaft through a sliding key, and the side end of the driven shaft is rotationally connected with the anchor stirring rod. The stirring device has the unique advantage that the distance between the vertical section of the anchor type stirring rod and the inner wall of the tank body can be changed by rotating the anchor type stirring rod. In the stirring process, the impact of materials on the inner wall of the tank body can be reduced; after the stirring is finished, the inner wall of the tank body can be scraped by utilizing the adjusted anchor type stirring rod, so that the material adhesion is avoided, and the reaction sufficiency is improved. In addition, the height adjusting mechanism, the supporting ring, the compression spring and the like are designed to have a synergistic effect, so that the reaction kettle is good in stirring effect, stable in operation and capable of flexibly meeting the requirements of the pyrrole nitrile alkylation reaction and overcoming the defects in the prior art.

Description

Technical Field

[0001] This utility model relates to the technical field of reaction vessel stirring devices, and in particular to a heating reaction vessel specifically for pyrrolidone alkylation reaction. Background Technology

[0002] In the field of chemical production, the pyrrolidone alkylation reaction is crucial for the synthesis of many fine chemical products. As the core equipment of this reaction, the performance of the reactor directly affects the efficiency and quality of the reaction.

[0003] Existing reactors used for pyrrolidone alkylation reactions typically achieve material mixing by installing a stirring device on the inner wall of the tank. However, existing stirring devices, namely anchor-type stirring rods, are insufficient in addressing the problem of material adhesion to the inner wall of the tank.

[0004] Controlling the distance between the anchor stirrer and the inner wall of the reactor in traditional reactors has always been a challenge. If the distance is too small, the material will violently impact the inner wall during stirring. Frequent occurrences of this not only accelerate the mechanical wear of the inner wall and shorten the reactor's lifespan, but also cause continuous friction between the material and the inner wall, generating additional heat. This phenomenon leads to a localized temperature rise in the reactor, making it difficult to precisely control the reaction temperature, which in turn negatively impacts the stability of the pyrrolidone alkylation reaction and the quality of the product.

[0005] Conversely, if the distance between the anchor stirring rod and the inner wall of the tank is too large, although it can reduce the impact and friction of the material on the inner wall, it will cause new problems. During the reaction, some material will inevitably adhere to the inner wall of the tank. An excessive distance makes it impossible for the anchor stirring rod to effectively carry the material to scrape off this material adhering to the inner wall. As the reaction continues, the material adhesion to the inner wall of the tank will become more and more serious. This will not only cause waste of raw materials, but also affect the mass and heat transfer efficiency in the reactor, resulting in incomplete reaction and reduced yield and quality of reaction products.

[0006] In summary, existing pyrrolidone alkylation reactors have serious shortcomings in handling materials on the inner wall of the vessel, leading to a series of problems during the reaction process and affecting reaction efficiency and production effectiveness. Therefore, it is urgent to develop a new type of reactor that can effectively solve the above problems. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention proposes a heated reactor specifically designed for the pyrrolidone alkylation reaction. This reactor allows for flexible adjustment of the anchor-type stirring rod's operating state according to the actual needs of the mixing process, effectively reducing potential damage to the reactor's inner wall from the materials. Furthermore, this design successfully overcomes the problem of inaccurate control of the gap between the vertical section of the anchor-type stirring rod and the reactor's inner wall in existing technologies.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A heating reactor specifically designed for pyrrolidone alkylation reactions includes a tank body. A discharge pipe is connected to the lower side of the tank body, and a feed pipe is connected to the upper side. The reactor body also includes a stirring device located inside the tank body. The stirring device includes a drive motor located on the upper side of the tank body and a transmission shaft located inside the tank body. The transmission shaft is fixedly connected to the output shaft of the drive motor. A driven shaft is located below the transmission shaft and is connected to the transmission shaft by a sliding key. A height adjustment mechanism is located below the driven shaft and abuts against the driven shaft. An anchor-type stirring rod is rotatably connected to the side end of the driven shaft. A support ring is located below the anchor-type stirring rod and is fixedly connected to the inner wall of the tank body.

[0010] Preferably, the projection of the anchor stirring rod on the vertical plane has an L-shaped structure, and the angle between the vertical section and the horizontal section of the anchor stirring rod is less than 90°.

[0011] Preferably, a scraper is fixedly connected to the vertical section of the anchor stirring rod on the side away from the driven shaft, and when the anchor stirring rod is at its highest point of stroke, the center line of the vertical section of the anchor stirring rod is perpendicular to the horizontal plane.

[0012] Preferably, the angle between the centerline of the scraper and the horizontal plane is greater than 0° and less than 90°; when the driven shaft rotates, the scraper will apply a downward oblique thrust to the material adhering to the inner wall of the tank.

[0013] Preferably, the central axis of the support ring has a wave-shaped structure; when the driven shaft is at its lowest point of travel and the support rod of the anchor stirring rod moves from the lowest point to the highest point of the support ring, the angle between the center line of the vertical section of the anchor stirring rod and the horizontal plane gradually decreases.

[0014] Preferably, the height adjustment mechanism includes a screw, the middle section of which is threadedly connected to the tank body, the upper end of which abuts against the driven shaft, and the lower end of which extends out of the tank body and is fixedly connected to a driving component.

[0015] Preferably, a bearing is fixedly connected to the upper end of the screw, the outer ring of the bearing is fixedly connected to the screw, and the inner ring of the bearing is fixedly connected to the driven shaft.

[0016] Preferably, a compression spring is coaxially arranged on the upper side of the driven shaft, and the two ends of the compression spring abut against the driven shaft and the transmission shaft, respectively.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention designs a structure that constrains the rotational connection between the anchor-type stirring rod and the driven shaft. A support ring and a height adjustment mechanism precisely constrain the horizontal position of the driven shaft and the anchor-type stirring rod. During stirring, this device effectively prevents materials from violently impacting the inner wall of the reactor and prevents unnecessary heat accumulation in the stirring area. After stirring, the anchor-type stirring rod can be precisely adjusted to the optimal position, ensuring its vertical section is tightly fitted against the inner wall of the reactor. At this point, the anchor-type stirring rod can efficiently scrape the inner wall of the reactor, thereby preventing materials from adhering to the inner wall and ensuring the integrity of the reaction. Through optimized design, this reactor ensures that materials are fully utilized after each reaction, significantly reducing raw material loss and thus improving reaction completeness and product yield. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the internal structure of the tank body of this utility model.

[0021] Figure 3 This is a schematic diagram of the overall structure of the stirring device of this utility model.

[0022] Figure 4 This is a schematic diagram showing the relationship between the driven shaft and the compression spring of this utility model.

[0023] Figure 5 This is a schematic diagram showing the relationship between the anchor-type stirring rod and the support ring of this utility model.

[0024] Figure 6 This is a schematic diagram showing the connection between the height adjustment mechanism and the tank body of this utility model.

[0025] Figure 7 This is a schematic diagram showing the relationship between the scraper and the tank body of this utility model.

[0026] In the diagram: 1. Feed pipe; 2. Tank body; 3. Discharge pipe; 4. Stirring device; 401. Drive motor; 402. Transmission shaft; 403. Driven shaft; 404. Anchor stirring rod; 405. Scraper; 406. Compression spring; 5. Support ring; 6. Bearing; 7. Screw; 8. Drive component. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Please see Figure 1 This utility model relates to a special heating reactor for pyrrolidone alkylation reaction. Its structure is consistent with the existing technology device, mainly consisting of a tank body 2. The tank body 2 serves as the basic supporting component of the entire device, providing the necessary space for the reaction.

[0030] The tank 2 has a reasonable layout, with a discharge pipe 3 on the lower side to facilitate the smooth discharge of products after the reaction is completed; and a feed pipe 1 on the upper side to transport the required raw materials into the tank before the reaction.

[0031] In addition, a stirring device 4 is installed inside the tank 2, which plays a key role in the reaction, ensuring that the materials are fully mixed and promoting the smooth progress of the pyrrolidone alkylation reaction.

[0032] Please see Figure 2 , Figure 3 Unlike existing technology devices, the stirring device 4 includes a drive motor 401 mounted on the upper side of the tank 2, which serves as the power source for the stirring device 4.

[0033] In addition, the tank body 2 is equipped with a vertically axial drive shaft 402. The drive motor 401 is fixedly connected to the drive shaft 402. This connection method ensures that the power output by the drive motor 401 can be transmitted to the drive shaft 402, so that the drive shaft 402 and the drive motor 401 rotate synchronously.

[0034] Below the drive shaft 402, a driven shaft 403 is disposed. The driven shaft 403 is connected to the drive shaft 402 via a sliding key. This design has two main functions: first, it ensures that the driven shaft 403 rotates synchronously when the drive shaft 402 rotates, effectively transmitting the stirring power; second, it allows the driven shaft 403 to slide axially on the drive shaft 402, providing structural support for subsequent height adjustment.

[0035] Therefore, this device is equipped with a height adjustment mechanism on the lower side of the tank body 2. The upper end of the height adjustment mechanism is in close contact with the driven shaft 403. With the help of the gravity of the driven shaft 403, the position of the driven shaft 403 is effectively restricted.

[0036] Specifically, such as Figure 6As shown, the core component of the height adjustment mechanism is the screw 7. The middle section of the screw 7 is connected to the tank 2 by a thread, allowing the screw 7 to rotate to achieve vertical movement.

[0037] It is worth noting that, such as Figure 6 As shown, a rubber sealing ring is fixedly connected to the side end of the screw 7. The sealing ring is fixedly connected to the inner wall of the tank 2, and the elasticity of the rubber ensures the sealing between the screw 7 and the tank 2.

[0038] In addition, the device also constrains the lower end of the screw 7 to protrude from the tank 2 and is fixedly connected to the drive component 8. By rotating the drive component 8, the operator can control the screw 7 to move up and down on the tank 2, thereby driving the driven shaft 403 to move vertically. This process enables precise adjustment of the height of the driven shaft 403, thereby changing the height position of the anchor stirring rod 404 inside the tank 2.

[0039] Furthermore, to avoid mutual interference between the rotation of the driven shaft 403 and the screw 7, a bearing 6 is fixedly connected to the upper end of the screw 7. The outer ring of the bearing 6 is fixed to the screw 7, and the inner ring is fixed to the driven shaft 403, thereby using the bearing 6 to constrain the position of the driven shaft 403 and ensure the smoothness of the rotation process of the driven shaft 403.

[0040] Please see Figure 2 , Figure 3 , Figure 7 To achieve the stirring of the material inside the tank 2, an anchor-type stirring rod 404 is rotatably connected to the side end of the driven shaft 403. When the driven shaft 403 rotates, the anchor-type stirring rod 404 performs a circular motion, thereby stirring the material inside the tank 2.

[0041] It is worth noting that since the anchor stirring rod 404 is rotatably connected to the driven shaft 403, meaning that the anchor stirring rod 404 can swing up and down relative to the driven shaft 403, in practice, the distance between the vertical section of the anchor stirring rod 404 and the inner wall of the tank 2 can be changed by rotating the anchor stirring rod 404. This ensures that the anchor stirring rod 404 can match the actual stirring process, allowing the device to reduce the impact of materials on the inner wall of the tank 2 during stirring. After stirring, the anchor stirring rod 404 is used to scrape the inner wall of the tank 2, thereby preventing materials from adhering to the inner wall of the tank 2 and causing incomplete reaction.

[0042] Specifically, to ensure this device can flexibly handle different stirring needs, we have specially designed an L-shaped anchor stirring rod 404, which is projected vertically. The angle between its vertical and horizontal sections is less than 90° to achieve optimal stirring effect. This is as follows: Figure 2As shown, under normal stirring conditions, the distance between the anchor stirring rod 404 and the inner wall of the tank 2 can be increased as much as possible. Similarly, as... Figure 7 As shown, after stirring, the anchor stirring rod 404 can be rotated so that most of its vertical section is close to the inner wall of the tank 2. At this time, the center line of the vertical section of the anchor support rod is perpendicular to the horizontal plane, thereby giving full play to the scraping effect on the inner wall of the tank 2.

[0043] Furthermore, to prevent the anchor stirring rod 404 from impacting and damaging the inner wall of the tank 2, a scraper 405 is fixedly connected to the vertical end of the anchor support rod on the side away from the driven shaft 403. In practice, the scraper 405 can be made of a flexible material to avoid hard collision with the inner wall of the tank 2.

[0044] Furthermore, to ensure that the material can fully contact most of the reactants and guarantee the completeness of the reaction process, this device constrains the angle between the centerline of the scraper 405 and the horizontal plane to be greater than 0° and less than 90°. Therefore, when the driven shaft 403 drives the anchor stirring rod 404 to rotate, the scraper 405 applies a downward force to the material adhering to the inner wall of the tank 2, pushing it to move. The core concept of this design is that the scraper 405 can quickly remove material residue from the inner wall of the tank 2, preventing accumulation from affecting the reaction, and can also reintegrate the scraped material into the reaction system through the oblique thrust, thereby more effectively promoting material mixing.

[0045] It must be pointed out that this device has a support ring 5 arranged on the lower side of the anchor stirring rod 404. This support ring 5 is fixedly connected to the inner wall of the tank 2 and is in close contact with the anchor stirring rod 404. Figure 5 and Figure 7 As shown, by utilizing the gravitational potential energy of the anchor stirring rod 404, the height of its horizontal section center position can be kept stable. Furthermore, by adjusting the position of the driven shaft 403, the angle of the center line of the vertical section of the anchor stirring rod 404 can be precisely controlled.

[0046] Furthermore, this device incorporates a wave-shaped design for the central axis of the support ring 5. This unique design complements the movement of the anchor stirring rod 404, enabling the angle of the anchor stirring rod 404 to change periodically during stirring. This dynamic angle adjustment allows the material to form more complex and diverse flow paths during stirring, thereby significantly enhancing the mixing effect and ensuring thorough mixing of all components within the reaction system, which is beneficial for the smooth progress of the pyrrolidone alkylation reaction.

[0047] Specifically, when the driven shaft 403 is at its lowest stroke, the anchor stirring rod 404 moves from the low point to the high point of the support ring 5, and the angle between its vertical section and the horizontal plane gradually decreases.

[0048] Furthermore, to prevent the driven shaft 403 from falling below the frictional force between it and the drive shaft 402, thus preventing it from moving downwards as expected, a compression spring 406 is coaxially positioned above the driven shaft 403. The two ends of the compression spring 406 are in close contact with the driven shaft 403 and the drive shaft 402, respectively. In the stirring device 4, the compression spring 406 plays a crucial buffering and compensation role. During reactor operation, the driven shaft 403 may be subjected to impact forces during stirring or instantaneous forces generated during height adjustment. In these situations, the compression spring 406 extends and retracts to absorb the impact force, protecting components from damage and extending the device's lifespan. Simultaneously, the presence of the compression spring 406 also helps maintain the stable operation of the stirring device 4, ensuring the continuity and stability of the stirring operation throughout the reaction process.

[0049] In practical applications, this utility model is as follows:

[0050] 1. Raw material input: Various reactants necessary for the pyrrolidinylation reaction, such as 4-pyrrolidinylpyridine, are fed into the reaction vessel through a feed pipe in a predetermined ratio and sequence as catalysts and ligands.

[0051] 2. Stirring Start: Start the drive motor 401, and the transmission shaft 402 will rotate accordingly, which will cause the driven shaft 403 to rotate synchronously, thereby driving the anchor stirring rod 404 at the end of the driven shaft 403 to stir the materials in the reaction vessel.

[0052] 3. Mixing process: During the mixing operation, the support ring 5 and the anchor mixing rod 404 work together to form a complex flow path for the material.

[0053] 4. Scraping the wall and adjusting the height and angle:

[0054] Preparation stage for wall scraping: After the mixing operation is successfully completed, preparations for the wall scraping operation will begin immediately.

[0055] Preliminary height adjustment steps: The height adjustment mechanism drive 8 below the reaction vessel needs to be rotated. The rotation of drive 8 drives the screw 7, which is tightly screwed to the reaction vessel, to rotate, thereby pushing the driven shaft 403 connected to the upper bearing 6 to move up and down. This is to initially adjust the height of the driven shaft 403, laying a solid foundation for the subsequent angle adjustment of the anchor stirring rod 404.

[0056] Angle Adjustment and Confirmation: During the height adjustment of the driven shaft 403, the angle of the anchor stirring rod 404 will change accordingly due to the wavy structure of the central axis of the support ring 5. Continuously observe and fine-tune the height of the driven shaft 403 until the center line of the vertical section of the anchor stirring rod 404 is adjusted to a vertical state.

[0057] Scraping operation: When the center line of the vertical section of the anchor stirring rod 404 is in a vertical state, the scraper 405 rotates with the anchor stirring rod 404 to scrape the inner wall of the reaction tank, ensuring that the material adhering to the inner wall of the reaction tank is effectively removed.

[0058] 5. Product output: The reaction products are discharged from the reaction tank through three discharge pipes.

[0059] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heating reactor specifically designed for pyrrolidone alkylation reaction, comprising a tank body (2), wherein a discharge pipe (3) is connected to the lower side of the tank body (2), and a feed pipe (1) is connected to the upper side, characterized in that: It also includes a stirring device (4) installed inside the tank (2); The stirring device (4) includes a drive motor (401) disposed on the upper side of the tank (2) and a transmission shaft (402) located inside the tank (2). The transmission shaft (402) is fixedly connected to the output shaft of the drive motor (401). A driven shaft (403) is disposed below the transmission shaft (402), and the driven shaft (403) is connected to the transmission shaft (402) by a sliding key. A height adjustment mechanism is provided below the driven shaft (403), and the height adjustment mechanism abuts against the driven shaft (403); An anchor-type stirring rod (404) is rotatably connected to the side end of the driven shaft (403). A support ring (5) is provided on the lower side of the anchor-type stirring rod (404), and the support ring (5) is fixedly connected to the inner wall of the tank (2).

2. The heating reactor for pyrrolidone alkylation reaction according to claim 1, characterized in that: The projection of the anchor stirring rod (404) on the vertical plane is an L-shaped structure, and the angle between the vertical section and the horizontal section of the anchor stirring rod (404) is less than 90°.

3. The heating reactor for pyrrolidone alkylation reaction according to claim 2, characterized in that: A scraper (405) is fixedly connected to the vertical section of the anchor stirring rod (404) on the side away from the driven shaft (403), and when the anchor stirring rod (404) is at its highest point of stroke, the center line of the vertical section of the anchor stirring rod (404) is perpendicular to the horizontal plane.

4. The heating reactor for pyrrolonitrile alkylation reaction according to claim 3, characterized in that: The angle between the centerline of the scraper (405) and the horizontal plane is greater than 0° and less than 90°; when the driven shaft (403) rotates, the scraper (405) will exert a downward oblique thrust on the material attached to the inner wall of the tank (2).

5. The heating reactor for pyrrolonitrile alkylation reaction according to claim 2, characterized in that: The central axis of the support ring (5) has a wave-shaped structure; when the driven shaft (403) is at its lowest point of travel and the support rod of the anchor stirring rod (404) moves from the lowest point to the highest point of the support ring (5), the angle between the center line of the vertical section of the anchor stirring rod (404) and the horizontal plane gradually decreases.

6. The heating reactor for pyrrolonitrile alkylation reaction according to claim 1, characterized in that: The height adjustment mechanism includes a screw (7), the middle section of which is threadedly connected to the tank body (2), the upper end of which abuts against the driven shaft (403), and the lower end of which extends out of the tank body (2) and is fixedly connected to a driving component (8).

7. The heating reactor for pyrrolonitrile alkylation reaction according to claim 6, characterized in that: A bearing (6) is fixedly connected to the upper end of the screw (7). The outer ring of the bearing (6) is fixedly connected to the screw (7), and the inner ring of the bearing (6) is fixedly connected to the driven shaft (403).

8. The heating reactor for pyrrolonitrile alkylation reaction according to claim 1, characterized in that: A compression spring (406) is coaxially arranged on the upper side of the driven shaft (403), and the two ends of the compression spring (406) abut against the driven shaft (403) and the transmission shaft (402) respectively.

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