A continuous crystallization cooler for p-aminophenol

Abstract

The utility model discloses an external cooler for continuous crystallization of p-aminophenol production, concretely relates to p-aminophenol crystallization production technical field, including external cooler cylinder, and the upper and lower sides of external cooler cylinder are provided with top cover and bottom cover respectively, and the both sides symmetrical of external cooler cylinder are provided with heat exchange board, and the opposite side symmetry fixed connection of two heat exchange boards has heat exchange cylinder, and the top fixed connection of top heat exchange board has vibration waterproof motor, and the surface of heat exchange board is provided with through -hole. The utility model discloses first through the cooperation of first limit strip and second limit strip and first clamping groove, can be positioned to the heat exchange board and heat exchange cylinder in the internal heat exchange board of external cooler cylinder, and is supported and is positioned through liquid outlet pipe, and through starting vibration waterproof motor and combining elastic pad can control heat exchange board and heat exchange cylinder and vibrate up and down, thereby will the crystal that adheres on the surface of heat exchange board and heat exchange cylinder is shaken and falls, avoids the crystal accumulation and blocks, and influences liquid flow -through effect, and further improves heat exchange effect.

Description

Technical Field

[0001] This utility model relates to the field of p-aminophenol crystallization production technology, and more specifically, to an external cooler for continuous crystallization of p-aminophenol. Background Technology

[0002] p-Aminophenol, as a crucial organic chemical raw material, plays an indispensable role in various industries such as pharmaceuticals, dyes, and rubber additives. In the industrial production process of p-aminophenol, a continuous hydrogenation reaction is first required. After a period of reaction, the hydrogenated liquid that meets quality standards enters a catalyst settling tank. In the settling tank, the catalyst is separated and returned to the hydrogenation system for recycling. The clear liquid at the top of the settling tank is then treated under reduced pressure and enters a ceramic membrane filtration system to further remove residual catalyst. Subsequently, the resulting pure clear liquid is sent to a continuous crystallizer. In the continuous crystallizer, the clear liquid needs to be cooled by heat exchange with cooling water or chilled water in an external cooler to promote the crystallization of p-aminophenol. This step has a decisive impact on product quality and production efficiency. Traditional external coolers use multiple heat exchange risers for heat exchange. However, during the cooling and crystallization process of p-aminophenol, some crystals adhere to the inner wall of the heat exchanger tubes. Over time, these crystals accumulate and gradually clog the heat exchanger tubes, which not only reduces heat exchange efficiency but may also lead to equipment failure, increase equipment maintenance costs and downtime, and cause great inconvenience to production. It is also inconvenient to clean the attached crystals. Therefore, an external cooler for continuous crystallization of p-aminophenol is proposed. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides an external cooler for the continuous crystallization of p-aminophenol, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an external cooler for the continuous crystallization of p-aminophenol, comprising an external cooler cylinder, a top cover and a bottom cover respectively provided on the upper and lower sides of the external cooler cylinder, heat exchange plates symmetrically arranged on both sides of the external cooler cylinder, and heat exchange cylinders symmetrically and fixedly connected to opposite sides of the two heat exchange plates. By introducing coolant into the interior of the heat exchange cylinders and heat exchange plates, the liquid located in the middle of the external cooler cylinder can be cooled and heat exchanged. A vibration waterproof motor is fixedly connected to the top of the top heat exchange plate. Activating the vibration waterproof motor can control the vibration of the heat exchange cylinders and heat exchange plates, thereby shaking off the crystals attached to the surface of the heat exchange cylinders and heat exchange plates to avoid accumulation and blockage. Through holes are opened on the surface of the heat exchange plates to facilitate the passage of liquid inside the top cover. The heat exchange plate has grooves on both sides. A connecting pipe is connected to the middle of one of the grooves via a flexible hose. Two first limiting rings are fixedly sleeved in the middle of the connecting pipe. A scraper is provided between the two heat exchange plates. Multiple scraping rings are fixedly connected to the bottom of the scraper. The two connecting pipes facilitate the inlet and outlet of coolant. The first limiting rings can limit the installation of the connecting pipe. The scraper moves up and down in the middle of the heat exchange cylinder. The scraping rings can scrape off the crystals attached to the surface of the heat exchange cylinder, improving the performance. A motor is fixedly connected to the top of the top cover, and a threaded rod is connected to the output end of the motor. A support rod is fixedly connected to the middle of the bottom cover, and a second limiting ring is fixedly connected to the top of the support rod. Starting the motor controls the threaded rod to drive the scraper to move up and down, which facilitates drive control. The stability of the threaded rod rotation is improved by the cooperation of the support rod and the second limiting ring.

[0005] Preferably, one end of the threaded rod passes through the middle of the heat exchange plate and the scraper and extends to the middle of the second limiting ring. The threaded rod is threadedly connected to the scraper and is not in contact with the heat exchange plate. The rotation of the threaded rod can control the up and down movement of the scraper and improve the stability of the threaded rod through the second limiting ring.

[0006] Preferably, the scraper ring corresponds one-to-one with the heat exchange cylinder, the heat exchange cylinder passes through the middle of the scraper, the scraper ring is sleeved in the middle of the scraper, and the middle wall of the scraper ring is in close contact with the outer surface wall of the heat exchange cylinder. The scraper ring scrapes away the crystals on the surface of the heat exchange cylinder, thereby improving the heat exchange effect.

[0007] Preferably, the top cover is provided with a liquid inlet pipe on one side of the top, and the bottom cover is connected to a liquid outlet pipe at the bottom. Both the top cover and the bottom cover are connected to both ends of the external cooler cylinder through flanges. The liquid inlet pipe facilitates liquid inlet, and the liquid outlet pipe facilitates liquid outlet. It also facilitates the combination and connection of the top cover and the bottom cover with the external cooler cylinder.

[0008] Preferably, a first limiting strip is fixedly connected to the top of the inner cavity of the bottom cover, an installation ring is fixedly connected to the top of the external cooler cylinder, an installation groove is opened at the bottom of the inner cavity of the top cover, the installation ring is located in the middle of the installation groove, a support ring and a second limiting strip are fixedly connected to the inner cavity of the installation ring, the second limiting strip corresponds one-to-one with the first limiting strip, one of the heat exchange plates is located at the top of the support ring, and elastic columns are provided at the bottom of the top heat exchange plate and the top wall of the support ring. A second locking block is fixedly connected to one side of the middle of the installation groove. The position of the top heat exchange plate is limited by the support ring, and the position of the heat exchange plate is limited by the cooperation of the second limiting strip and the first limiting strip with the first locking groove, which improves the stability of the heat exchange plate's up and down movement. The elastic column can prevent the top heat exchange plate from colliding when it vibrates up and down, thus improving the performance.

[0009] Preferably, the heat exchange plate has a first slot around its perimeter, the first slot corresponding to a first limiting strip and a second limiting strip, and both the first limiting strip and the second limiting strip are located in the middle of the first slot.

[0010] Preferably, a fourth slot is provided on one side of the bottom of the external cooler cylinder, and a third block is fixedly connected to the top side of the bottom cover at a position that matches the fourth slot. The third block is located in the middle of the fourth slot, and one of the connecting pipes is located on the top of the third block.

[0011] Preferably, a second slot is provided on one side of the top of the mounting ring, a first locking block is fixedly connected to the top of the external cooler cylinder at a position corresponding to the second slot, a third slot is provided at the bottom of the top cover at a position corresponding to the second slot, the third slot corresponds to the second locking block, one of the connecting pipes is located in the middle of the second slot, the cooperation of the fourth slot and the third locking block facilitates the installation, limiting and sealing connection of the bottom connecting pipe, the cooperation of the second slot and the first locking block and the second locking block and the third slot facilitates the installation, limiting and sealing connection of the top connecting pipe, and facilitates combined installation and use.

[0012] The technical effects and advantages of this utility model are as follows: 1. This utility model firstly limits the heat exchange plate and heat exchange cylinder inside the external cooler cylinder by setting the first limiting strip and the second limiting strip in cooperation with the first slot, and supports and limits them by the liquid outlet pipe. By starting the vibration waterproof motor in combination with the elastic pad, the heat exchange plate and heat exchange cylinder can be controlled to vibrate up and down, thereby shaking off the crystals attached to the surface of the heat exchange plate and heat exchange cylinder, avoiding crystal accumulation and blockage, affecting the liquid flow effect, and thus improving the heat exchange effect. 2. This utility model also controls the screw rod to drive the scraper to move between the two heat exchange plates by starting the motor. The scraper ring can scrape off the crystals attached to the surface of the heat exchange cylinder, which can further play a cleaning role, improve the heat exchange effect, and facilitate cleaning and use. In addition, the support rod and the second limiting ring support and limit one end of the screw rod, which improves the stability of the screw rod. The first limiting ring facilitates the limiting installation of the connecting pipe, which improves the use effect. In summary, through the interaction of the above-mentioned multiple functions, it is possible to easily shake off and scrape off the crystals adhering to the surface of the heat exchange plate and heat exchange cylinder, avoid crystal accumulation and blockage, and improve the liquid flow effect, thereby improving the heat exchange effect. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the connection structure between the heat exchange plate and the heat exchange cylinder of this utility model.

[0016] Figure 4 This is a schematic diagram of the external cooler cylinder of this utility model.

[0017] Figure 5 This is a schematic diagram of the structure of the top cover of this utility model.

[0018] Figure 6 This is a schematic diagram of the structure of the bottom cover of this utility model.

[0019] Figure 7 This is a schematic diagram of the scraper of this utility model.

[0020] The attached diagram is labeled as follows: 1. External cooler cylinder; 2. Top cover; 3. Bottom cover; 4. Heat exchange plate; 5. Heat exchange cylinder; 6. Vibration waterproof motor; 7. Through hole; 8. Connecting pipe; 9. First limiting ring; 10. Scraper; 11. Scraper ring; 12. Motor; 13. Threaded rod; 14. Support rod; 15. Second limiting ring; 16. First limiting strip; 17. Second limiting strip; 18. First slot; 19. Liquid inlet pipe; 20. Liquid outlet pipe; 21. Groove; 22. Support ring; 23. Second slot; 24. First locking block; 25. Mounting ring; 26. Mounting groove; 27. Third slot; 28. Second locking block; 29. ​​Third locking block; 30. Fourth slot. Detailed Implementation

[0021] 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.

[0022] As attached Figure 1-7 An external cooler for continuous crystallization of p-aminophenol is shown, comprising an external cooler body 1, with a top cover 2 and a bottom cover 3 respectively provided on the upper and lower sides of the external cooler body 1. Heat exchange plates 4 are symmetrically arranged on both sides of the external cooler body 1, and heat exchange cylinders 5 are symmetrically fixedly connected to opposite sides of the two heat exchange plates 4. By introducing coolant into the interior of the heat exchange cylinders 5 and heat exchange plates 4, the liquid located in the middle of the external cooler body 1 can be cooled and heat exchanged. A vibration waterproof motor 6 is fixedly connected to the top of the top heat exchange plate 4. Activating the vibration waterproof motor 6 can control the vibration of the heat exchange cylinders 5 and heat exchange plates 4, thereby shaking off the crystals attached to the surface of the heat exchange cylinders 5 and heat exchange plates 4 to avoid accumulation and blockage. Through holes 7 are opened on the surface of the heat exchange plates 4 to facilitate the passage of liquid inside the top cover 2. Both sides of the heat exchange plate 4 are provided with grooves 21. A connecting pipe 8 is connected to the middle of one of the grooves 21 through a hose. Two first limiting rings 9 are fixedly sleeved in the middle of the connecting pipe 8. A scraper 10 is provided between the two heat exchange plates 4. Multiple scraping rings 11 are fixedly connected to the bottom of the scraper 10. The two connecting pipes 8 can facilitate the inlet and outlet of coolant. The first limiting rings 9 can limit the installation of the connecting pipe 8. The scraper 10 can move up and down in the middle of the heat exchange cylinder 5. The scraping rings 11 can scrape off the crystals attached to the surface of the heat exchange cylinder 5, thereby improving the performance. A motor 12 is fixedly connected to the top of the top cover 2, and a threaded rod 13 is connected to the output end of the motor 12. A support rod 14 is fixedly connected to the middle of the bottom cover 3, and a second limiting ring 15 is fixedly connected to the top of the support rod 14. The motor 12 is started to control the threaded rod 13 to drive the scraper 10 to move up and down, which facilitates drive control. The stability of the rotation of the threaded rod 13 is improved by the cooperation of the support rod 14 and the second limiting ring 15.

[0023] As attached Figure 1 , 2As shown in Figures 3, 5, 6, and 7, one end of the threaded rod 13 passes through the middle of the heat exchange plate 4 and the scraper 10 and extends to the middle of the second limiting ring 15. The threaded rod 13 is threadedly connected to the scraper 10, but the threaded rod 13 is not in contact with the heat exchange plate 4. The scraper ring 11 corresponds one-to-one with the heat exchange cylinder 5. The heat exchange cylinder 5 passes through the middle of the scraper 10, and the scraper ring 11 is fitted around the middle of the scraper 10. The middle wall of the scraper ring 11 is tightly fitted with the outer surface wall of the heat exchange cylinder 5. A top cover 2 is provided on one side of its top. The system includes an inlet pipe 19, an outlet pipe 20 connected to the bottom of the bottom cover 3, and both the top cover 2 and the bottom cover 3 connected to both ends of the external cooler cylinder 1 via flanges. A first limiting strip 16 is fixedly connected to the top of the inner cavity of the bottom cover 3, and an installation ring 25 is fixedly connected to the top of the external cooler cylinder 1. An installation groove 26 is formed at the bottom of the inner cavity of the top cover 2, and the installation ring 25 is positioned in the middle of the installation groove 26. A support ring 22 and a second limiting strip 17 are fixedly connected to the inner cavity of the installation ring 25. Strip 17 corresponds one-to-one with the first limiting strip 16. One of the heat exchange plates 4 is set on the top of the support ring 22. The bottom of the top heat exchange plate 4 and the top wall of the support ring 22 are both provided with elastic columns. The middle side of the mounting groove 26 is fixedly connected to the second locking block 28. The rotation of the threaded rod 13 can control the scraper 10 to move up and down. The stability of the threaded rod 13 is improved by the second limiting ring 15. The scraper ring 11 scrapes the crystals on the surface of the heat exchange cylinder 5 to improve the heat exchange effect. The liquid inlet pipe 19 facilitates liquid inlet and the liquid outlet pipe 20 facilitates liquid outlet. It is also convenient to combine and connect the top cover 2 and the bottom cover 3 with the external cooler cylinder 1. The position of the top heat exchange plate 4 is limited by the support ring 22. The position of the heat exchange plate 4 is limited by the cooperation of the second limiting strip 17 and the first limiting strip 16 with the first locking groove 18, which improves the stability of the up and down movement of the heat exchange plate 4. The elastic column can prevent the top heat exchange plate 4 from colliding when it vibrates up and down, thus improving the performance.

[0024] As attached Figure 3-6As shown, a first slot 18 is provided around the heat exchange plate 4, corresponding to a first limiting strip 16 and a second limiting strip 17. Both the first limiting strip 16 and the second limiting strip 17 are located in the middle of the first slot 18. A fourth slot 30 is provided on one side of the bottom of the external cooler cylinder 1. A third locking block 29 is fixedly connected to the top side of the bottom cover 3 at a position compatible with the fourth slot 30. The third locking block 29 is located in the middle of the fourth slot 30, and one connecting pipe 8 is located on the top of the third locking block 29. A second slot 23 is provided on one side of the top of the mounting ring 25. The external cooler cylinder 1... A first locking block 24 is fixedly connected to the top of the top cover 2 at the position corresponding to the second locking slot 23. A third locking slot 27 is opened at the bottom of the top cover 2 at the position corresponding to the second locking slot 23. The third locking slot 27 corresponds to the second locking block 28. One of the connecting pipes 8 is set in the middle of the second locking slot 23. Through the cooperation of the fourth locking slot 30 and the third locking block 29, it is convenient to install, limit and seal the bottom connecting pipe 8. Through the cooperation of the second locking slot 23 and the first locking block 24, the second locking block 28 and the third locking slot 27, it is convenient to install, limit and seal the top connecting pipe 8, which is convenient for combination installation and use.

[0025] The working principle of this utility model is as follows: When in use, the filtered liquid is input into the interior of the top cover 2 through the liquid inlet pipe 19, and at the same time, coolant is input into the heat exchange plate 4 and the heat exchange cylinder 5 through a connecting pipe 8 to exchange heat and cool down the input liquid. The top heat exchange plate 4 can reduce the rate of liquid falling and improve the heat exchange quality. During use, the vibration waterproof motor 6 can be periodically controlled to start, which can make the heat exchange plate 4 and heat exchange cylinder 5 vibrate up and down inside the external cooler cylinder 1. The stability of the vibration is improved by the cooperation of the first limiting strip 16 and the second limiting strip 17 with the first slot 18. The vibration of the heat exchange plate 4 and heat exchange cylinder 5 can shake off the attached crystals, avoiding the accumulation of crystals that affect the liquid flow effect. Then, the motor 12 can be started periodically to control the threaded rod 13 to drive the scraper 10 to move between the two heat exchange plates 4. The crystals on the surface of the heat exchange cylinder 5 can be scraped off by the scraper ring 11, thereby improving the heat exchange effect between the liquid inside the heat exchange cylinder 5 and the external clear liquid and improving the performance.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An external cooler for the continuous crystallization of p-aminophenol, comprising an external cooler cylinder (1), characterized in that: The external cooler cylinder (1) is provided with a top cover (2) and a bottom cover (3) on its upper and lower sides respectively. Heat exchange plates (4) are symmetrically arranged on both sides of the external cooler cylinder (1). Heat exchange cylinders (5) are symmetrically fixedly connected to the opposite side of the two heat exchange plates (4). A vibration waterproof motor (6) is fixedly connected to the top of the top heat exchange plate (4). Through holes (7) are opened on the surface of the heat exchange plate (4). The heat exchange plate (4) has grooves (21) on both sides. A connecting pipe (8) is connected to the middle of one of the grooves (21) through a hose. Two first limiting rings (9) are fixedly sleeved in the middle of the connecting pipe (8). A scraper (10) is provided between the two heat exchange plates (4). Multiple scraping rings (11) are fixedly connected to the bottom of the scraper (10). A motor (12) is fixedly connected to the top of the top cover (2), and a threaded rod (13) is connected to the output end of the motor (12). A support rod (14) is fixedly connected to the middle of the bottom cover (3), and a second limiting ring (15) is fixedly connected to the top of the support rod (14).

2. An external cooler for continuous crystallization of p-aminophenol according to claim 1, characterized in that: One end of the threaded rod (13) passes through the middle of the heat exchange plate (4) and the scraper (10) and extends to the middle of the second limiting ring (15). The threaded rod (13) is threadedly connected to the scraper (10), and the threaded rod (13) is not in contact with the heat exchange plate (4).

3. An external cooler for continuous crystallization of p-aminophenol according to claim 1, characterized in that: The scraper ring (11) corresponds one-to-one with the heat exchange cylinder (5). The heat exchange cylinder (5) passes through the middle of the scraper (10). The scraper ring (11) is fitted around the middle of the scraper (10). The middle wall of the scraper ring (11) is in close contact with the outer surface wall of the heat exchange cylinder (5).

4. An external cooler for continuous crystallization of p-aminophenol according to claim 1, characterized in that: The top cover (2) is provided with an inlet pipe (19) on one side of the top, and the bottom cover (3) is connected to an outlet pipe (20) at the bottom. Both the top cover (2) and the bottom cover (3) are connected to the two ends of the external cooler cylinder (1) through flanges.

5. An external cooler for continuous crystallization of p-aminophenol according to claim 1, characterized in that: The top of the inner cavity of the bottom cover (3) is fixedly connected to a first limiting strip (16), the top of the external cooler cylinder (1) is fixedly connected to an installation ring (25), the bottom of the inner cavity of the top cover (2) is provided with an installation groove (26), the installation ring (25) is located in the middle of the installation groove (26), the inner cavity of the installation ring (25) is fixedly connected to a support ring (22) and a second limiting strip (17), the second limiting strip (17) corresponds one-to-one with the first limiting strip (16), one of the heat exchange plates (4) is located on the top of the support ring (22), the bottom of the top heat exchange plate (4) and the top wall of the support ring (22) are both provided with elastic columns, and a second locking block (28) is fixedly connected to one side of the middle of the installation groove (26).

6. An external cooler for continuous crystallization of p-aminophenol according to claim 1, characterized in that: The heat exchange plate (4) has a first slot (18) around its perimeter. The first slot (18) corresponds to the first limiting strip (16) and the second limiting strip (17). The first limiting strip (16) and the second limiting strip (17) are both located in the middle of the first slot (18).

7. An external cooler for continuous crystallization of p-aminophenol according to claim 1, characterized in that: The bottom side of the external cooler cylinder (1) is provided with a fourth slot (30), and a third block (29) is fixedly connected to the top side of the bottom cover (3) at a position that matches the fourth slot (30). The third block (29) is located in the middle of the fourth slot (30), and one of the connecting pipes (8) is located on the top of the third block (29).

8. An external cooler for continuous crystallization of p-aminophenol according to claim 5, characterized in that: The top side of the mounting ring (25) is provided with a second slot (23), the top of the external cooler cylinder (1) is fixedly connected with a first locking block (24) at the position corresponding to the second slot (23), the bottom of the top cover (2) is provided with a third slot (27) at the position corresponding to the second slot (23), the third slot (27) corresponds to the second locking block (28), and one of the connecting pipes (8) is set in the middle of the second slot (23).

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