A bubbling stirred reactor for 2-hydroxy-3-naphthoic acid

Abstract

This utility model relates to the field of reactor stirring technology, and more particularly to a bubbling stirred reactor for 2-hydroxy-3-naphthoic acid, comprising: a reactor body, a protective shell fixedly installed on the upper side of the reactor body, a control motor fixedly installed on the upper side of the protective shell, a reducer fixedly installed at the output end of the control motor, a rotating shaft fixedly installed at the output end of the reducer, three axial flow stirrers fixedly connected to the outer side of the rotating shaft, and a filling port fixedly connected to the upper side of the reactor body. This utility model utilizes a scraping structure to enable the scraping plate to scrape away coking material from the inner wall of the reactor body with the power of the rotating shaft, and a cleaning structure to clean the surface of the scraping plate during rotation.

Description

Technical Field

[0001] This utility model relates to the field of reaction vessel stirring technology, and in particular to a bubbling stirred reaction vessel for 2-hydroxy-3-naphthoic acid. Background Technology

[0002] In modern dye and intermediate production, the synthesis and purification of 2-hydroxy-3-naphthoic acid often involves gas-liquid-solid multiphase reaction systems. Bubble-type stirred reactors are used due to their unique advantages, especially in stirring. They use a bottom gas distributor to introduce inert or reactive gases to generate bubbles, forming a gentle and uniform upward flow field to achieve pneumatic mixing. This stirring method avoids the problems of entrapment, dead zones, or local overheating that are prone to occur with traditional mechanical stirring blades in highly viscous or solid suspension media. It is particularly suitable for this material system, effectively promoting reactant dispersion, enhancing mass and heat transfer, and preventing scaling, thus ensuring stable product quality and production efficiency.

[0003] Currently, when the reactor is stirring during the production of 2-hydroxy-3-naphthoic acid, some coking may be generated. The coking can adhere to the inner wall of the reactor, thus affecting the heat transfer efficiency and leading to local overheating and decomposition. Moreover, manual cleaning is required after production, which is very troublesome. During the cleaning process, some coking may remain on the scraper, which greatly reduces the scraping efficiency of the scraper. Utility Model Content

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A bubbling stirred reactor for 2-hydroxy-3-naphthoic acid, comprising:

[0006] The reactor body has a protective shell fixedly installed on its upper side, a control motor fixedly installed on the upper side of the protective shell, a reducer fixedly installed at the output end of the control motor, a rotating shaft fixedly installed at the output end of the reducer, three axial flow agitators fixedly connected to the outside of the rotating shaft, a filling port fixedly connected to the upper side of the reactor body, a flip-top plate rotatably connected to the side wall of the filling port, and a scraping structure installed on the rotating shaft.

[0007] Preferably, the scraping structure includes a cylindrical fixing block fixedly sleeved on the outside of the rotating shaft, three sliders slidably connected to the inner side of the cylindrical fixing block, connecting rods fixedly connected to the side walls of the three sliders, scraping plates fixedly connected to the side walls of the three connecting rods, compression springs fixedly connected between the three connecting rods and the cylindrical fixing block, three extrusion rods fixedly connected to the inner side of the reactor body, and a cleaning structure also installed on the cylindrical fixing block.

[0008] Preferably, the cleaning structure includes three support plates fixedly connected to the side wall of the cylindrical fixed block, each of the three support plates having a reciprocating screw rotatably connected to its side wall, two fixed rods fixedly connected to the inner side of the scraping plate, a cleaning plate slidably sleeved on the outer side of the two fixed rods, a reciprocating block rotatably connected to the side wall of the cleaning plate, spur gears fixedly sleeved on the upper ends of each of the three reciprocating screws, and a gear ring fixedly connected to the inner side of the reactor body, with the three spur gears meshing with the gear ring.

[0009] Preferably, a thermoelectric module is fixedly installed on the outside of the reactor body.

[0010] Preferably, four high-leg rods are fixedly connected to the lower side of the reactor body, and each of the four high-leg rods is fixedly connected to a pad.

[0011] Preferably, the underside of the pad has anti-slip texture.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. In this utility model, the scraping structure enables the scraping plate to scrape off the coking material from the inner wall of the reactor body by the power of the rotating shaft. The area that the moving scraping plate can scrape is increased, and the amount of coking material adhering to the scraping plate is reduced. This reduces the amount of coking material adhering to the reactor body, ensures the efficiency of heat conduction, and avoids local overheating.

[0014] 2. In this utility model, the cleaning structure enables the cleaning plate to clean the surface of the scraper plate during rotation, preventing the charred material from remaining on the scraper plate and reducing the scraping efficiency, thus ensuring the cleaning efficiency of the scraper plate. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a bubbling stirred reactor for 2-hydroxy-3-naphthoic acid proposed in this utility model;

[0016] Figure 2 This is a cross-sectional view of the internal structure of a bubbling stirred reactor for 2-hydroxy-3-naphthoic acid proposed in this utility model;

[0017] Figure 3 This is a cross-sectional view of the scraping structure of a bubbling stirred reactor for 2-hydroxy-3-naphthoic acid proposed in this utility model;

[0018] Figure 4 This is a cross-sectional view of the clean structure of a bubbling stirred reactor for 2-hydroxy-3-naphthoic acid proposed in this utility model;

[0019] Figure 5 for Figure 2Enlarged view of point A in the middle;

[0020] Figure 6 for Figure 4 Enlarged view of section B in the middle.

[0021] In the diagram: 1 Reactor body, 2 Protective shell, 3 Control motor, 4 Reducer, 5 Rotary shaft, 6 Axial flow agitator, 7 Filling port, 8 Flip cover, 9 Cylindrical fixing block, 10 Slider, 11 Connecting rod, 12 Scraper, 13 Compression spring, 14 Extrusion rod, 15 Support plate, 16 Reciprocating screw, 17 Fixing rod, 18 Cleaning plate, 19 Reciprocating block, 20 Spur gear, 21 Gear ring, 22 Thermoelectric module, 23 High leg rod. Detailed Implementation

[0022] Reference Figures 1-6 A bubbling stirred reactor for 2-hydroxy-3-naphthoic acid, comprising:

[0023] The reactor body 1 has a protective shell 2 fixedly mounted on its upper side. A control motor 3 is fixedly mounted on the upper side of the protective shell 2. A reducer 4 is fixedly mounted on the output end of the control motor 3. The core function of the reducer 4 is to match the motor output with the load requirements, mainly by reducing the speed and increasing the torque. It acts as an "intermediate adapter" for power transmission, converting the high speed and low torque output of the motor into the low speed and high torque required by the load. This helps to reduce the large rotational inertia of the load onto the motor shaft, making it appear smaller. This makes it easier for the motor to start, stop, and accelerate the load, improving the system's dynamic response performance and control accuracy. Using a smaller power, higher speed motor in conjunction with the reducer 4 can achieve a low-speed, high-torque output, which is more economical and compact than directly using a high-power, low-speed motor. This is existing technology and will not be elaborated further. The reducer 4 has one input end and one output end. The input end of the reducer 4 is connected to the output end of the control motor 3. A rotating shaft 5 is fixedly mounted on the output end of the reducer 4. Three axial flow stirrers 6 are fixedly connected to the outside. A thermoelectric module 22 is fixedly installed on the outside of the reactor body 1. The thermoelectric module 22 is composed of many pairs of N-type and P-type semiconductor thermocouples connected in series and sandwiched between two ceramic plates. When energized, one ceramic plate becomes cold (heat-absorbing end) and the other becomes hot (heat-releasing end). Reversing the current direction immediately swaps the cold and hot ends. By changing the direction of the current, the reactor body 1 can quickly switch between heating and cooling when needed. This is existing technology and will not be elaborated further. The reactor body 1 is fixedly connected to a filling port 7 on its upper side. A flip cover plate 8 is rotatably connected to the side wall of the filling port 7. Four high legs 23 are fixedly connected to the lower side of the reactor body 1. Each of the four high legs 23 has a pad fixedly connected to its lower end. The high legs 23 facilitate the handling of the reactor body 1 and are far from the ground, reducing the impact of sudden situations. The pads have anti-slip textures on their lower side, which increase the friction between the pads and the ground, preventing the reactor body 1 from easily sliding due to external forces. A scraping structure is installed on the rotating shaft 5.

[0024] The scraping structure includes a cylindrical fixing block 9 fixedly sleeved on the outside of the rotating shaft 5. Three sliders 10 are slidably connected to the inside of the cylindrical fixing block 9. The upper ends of the three sliders 10 are all opened with inclined sliding surfaces on both sides. Connecting rods 11 are fixedly connected to the side walls of the three sliders 10. Scraping plates 12 are fixedly connected to the side walls of the three connecting rods 11. Compression springs 13 are fixedly connected between the three connecting rods 11 and the cylindrical fixing block 9. Three extrusion rods 14 are fixedly connected to the inside of the reactor body 1. The extrusion rods 14 can extrude the sliders 10 downwards. After being no longer extruded, they return to their original position through the compression springs 13. A cleaning structure is also installed on the cylindrical fixing block 9.

[0025] The cleaning structure includes three support plates 15 fixedly connected to the side wall of the cylindrical fixed block 9. Each of the three support plates 15 has a reciprocating screw 16 rotatably connected to its side wall. The reciprocating screw 16 is installed inside the scraper plate 12 but is not directly connected to it. The up-and-down movement of the scraper plate 12 will not affect the reciprocating screw 16, nor will it interfere with its rotation. Two fixing rods 17 are fixedly connected to the inner side of the scraper plate 12. A cleaning plate 18 is slidably sleeved on the outer side of the two fixing rods 17. The cleaning plate 18 is tightly fitted to the side of the scraper plate 12. The side wall of the cleaning plate 18 rotates... The moving connection is a reciprocating block 19. When the scraping plate 12 moves up and down, the cleaning plate 18 is slidably connected to the two fixed rods 17, so the movement of the fixed rods 17 will not affect the cleaning plate 18. The cleaning plate 18 will still reciprocate on the reciprocating screw 16 through the reciprocating block 19. The fixed rod 17 only restricts the direction of movement of the cleaning plate 18 and will not cause any other additional effects on the cleaning plate 18. The upper ends of the three reciprocating screws 16 are all fixedly sleeved with spur gears 20. The inner side of the reactor body 1 is fixedly connected with a toothed ring 21. The three spur gears 20 mesh with the toothed ring 21.

[0026] In this invention, firstly, the operator introduces the 2-hydroxy-3-naphthoic acid to be processed into the reactor body 1 through the filling port 7. The control motor 3 is then started, and the control motor 3 switches to a low-speed, high-torque mode via the reducer 4. This reduces the speed of the motor, which in turn drives the rotating shaft 5 to rotate. The axial flow agitator 6 then stirs the 2-hydroxy-3-naphthoic acid. During the rotation of the rotating shaft 5, the cylindrical fixing block 9 drives the slider 10 to rotate. The slider 10, through the connecting rod 11, drives the scraper plate 12 to rotate. During this rotation, the scraper plate 12 is stirred by the extrusion rod 1. 4. The slider 10 is squeezed, which allows the scraper 12 to move up and down during rotation. This reduces the adhesion of coke to the scraper 12 when cleaning the inner wall of the reactor body 1. At the same time, the reciprocating screw 16 also makes a circular motion through the support plate 15. During the motion, the reciprocating screw 16 can rotate through the spur gear 20 and the gear ring 21. The rotating reciprocating screw 16 causes the reciprocating block 19 to drive the cleaning plate 18 to make a reciprocating motion outside the two fixed rods 17, thereby cleaning the side wall of the scraper 12 through the cleaning plate 18.

Claims

1. A 2-hydroxy-3-naphthoic acid bubble agitated reaction vessel comprising a reaction vessel body (1), characterized in that, A protective shell (2) is fixedly installed on the upper side of the reactor body (1). A control motor (3) is fixedly installed on the upper side of the protective shell (2). A reducer (4) is fixedly installed at the output end of the control motor (3). A rotating shaft (5) is fixedly installed at the output end of the reducer (4). Three axial flow agitators (6) are fixedly connected to the outside of the rotating shaft (5). A filling port (7) is fixedly connected to the upper side of the reactor body (1). A flip-top plate (8) is rotatably connected to the side wall of the filling port (7). A scraping structure is installed on the rotating shaft (5). In addition to the structure including a cylindrical fixing block (9) fixedly sleeved on the outside of the rotating shaft (5), three sliders (10) are slidably connected to the inner side of the cylindrical fixing block (9), and connecting rods (11) are fixedly connected to the side walls of the three sliders (10). Scraping plates (12) are fixedly connected to the side walls of the three connecting rods (11). Compression springs (13) are fixedly connected between the three connecting rods (11) and the cylindrical fixing block (9). Three extrusion rods (14) are fixedly connected to the inner side of the reactor body (1). A cleaning structure is also installed on the cylindrical fixing block (9).

2. The 2-hydroxy-3-naphthoic acid bubble column reactor according to claim 1, wherein The cleaning structure includes three support plates (15) fixedly connected to the side wall of the cylindrical fixed block (9). The side walls of the three support plates (15) are rotatably connected to reciprocating screws (16). The inner side of the scraping plate (12) is fixedly connected to two fixed rods (17). The outer sides of the two fixed rods (17) are slidably sleeved with a cleaning plate (18). The side wall of the cleaning plate (18) is rotatably connected to a reciprocating block (19). The upper ends of the three reciprocating screws (16) are all fixedly sleeved with spur gears (20). The inner side of the reactor body (1) is fixedly connected to a gear ring (21). The three spur gears (20) mesh with the gear ring (21).

3. The 2-hydroxy-3-naphthoic acid bubble column reactor according to claim 1, wherein A thermoelectric module (22) is fixedly installed on the outside of the reactor body (1).

4. The 2-hydroxy-3-naphthoic acid bubble column reactor according to claim 1, wherein Four high-leg rods (23) are fixedly connected to the lower side of the reactor body (1), and pads are fixedly connected to the lower ends of the four high-leg rods (23).

5. The 2-hydroxy-3-naphthoic acid bubble column reactor according to claim 4, wherein The foot pad has anti-slip texture on the lower side.

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