A tetrahydrophthalic anhydride production apparatus

Abstract

This invention relates to a tetrahydrophthalic anhydride production apparatus, comprising a stabilizing sleeve and a cross-shaped support frame. A top connecting shaft is centrally located on the cross-shaped support frame, and a connecting seat is connected to the bottom end of the top connecting shaft. A first docking seat is fixedly connected to the bottom of the connecting seat, and connecting rods are fixedly connected to both sides of the first docking seat. A first U-shaped side frame is fixedly connected to one side of the first docking seat via a connecting rod, and a second U-shaped side frame is fixedly connected to the other side of the first docking seat via a connecting rod. This invention, through the arrangement of the stabilizing sleeve, first docking seat, connecting rods, first U-shaped side frame, second U-shaped side frame, rotating ring seat, top block, reaction vessel, base, motor frame, drive motor, and insertion slot, can more efficiently complete the sampling work of tetrahydrophthalic anhydride during production. In actual use, the operator first evenly spreads the maleic anhydride raw material to be processed on each tray inside the reaction vessel.

Description

Technical Field

[0001] This invention relates to the field of tetrahydrophthalic anhydride production technology, specifically to a tetrahydrophthalic anhydride production apparatus. Background Technology

[0002] Tetrahydrophthalic anhydride is a downstream product of maleic anhydride. It is used in alkyd resins and unsaturated resins to improve the adhesion, elasticity, gloss, and water resistance of coatings. As a curing agent, compared to amines, it can produce products with good high-temperature electrical properties, so it is commonly used as a curing agent for epoxy resins. As a plasticizer, it can improve the cold and heat resistance of PVC and is non-toxic. This product is also a raw material for synthesizing surfactants, pharmaceuticals, and pesticides. Tetrahydrophthalic anhydride is also an important chemical intermediate used in the synthesis of numerous chemical products. The reaction between maleic anhydride and butadiene is a diene synthesis. According to frontier orbital theory, butadiene and maleic anhydride readily react under certain conditions. The above reaction, using maleic anhydride and butadiene as raw materials to synthesize tetrahydrophthalic anhydride, can be carried out by solvent method and melt method. Tetrahydrophthalic anhydride can be used to synthesize butanetetracarboxylic acid, which is an important chemical product widely used in textile, chemical, metallurgical, and electronics industries. The main method for industrial production of BTCA is the chemical oxidation method, that is, using an oxidant to oxidize tetrahydrophthalic anhydride to prepare BTCA. This reaction is usually carried out under catalytic conditions, and the oxidants used are nothing more than H2O2 and HNO3. The synthesis of BTCA using HNO3 as an oxidant is a one-step reaction, with the advantages of rapid reaction, easy post-processing, and no residual components.

[0003] For example, patent document CN 113117627 B discloses a tetrahydrophthalic anhydride production apparatus. It includes a tetrahydrophthalic anhydride synthesis reactor, a maleic anhydride metering tank, a butadiene metering tank, and a dilution chamber. The maleic anhydride metering tank is connected to the tetrahydrophthalic anhydride synthesis reactor, the butadiene metering tank is connected to the tetrahydrophthalic anhydride synthesis reactor, and the dilution chamber is connected to the tetrahydrophthalic anhydride synthesis reactor, forming a dilution loop with the reactor. This invention uses a large-scale circulation of tetrahydrophthalic anhydride itself to form a closed-loop circulation to dilute the butadiene gas, solving the problem of strong odor in tetrahydrophthalic anhydride and improving product yield.

[0004] However, in the actual production process of tetrahydrophthalic anhydride, this structure typically requires extracting butadiene gas to stop the reaction between maleic anhydride and butadiene, then reopening the reaction vessel to sample and test the tetrahydrophthalic anhydride product. The entire sampling process cannot be continuously operated. If the sample reaction fails to meet standards, butadiene gas must be refilled into the reaction vessel to continue the reaction. This cumbersome and slow operation severely impacts overall production and hinders the efficient utilization of gaseous butadiene, leading to a significant waste of raw materials and hindering daily use. Therefore, there is an urgent need to design a tetrahydrophthalic anhydride production device to solve these problems. Summary of the Invention

[0005] To overcome the aforementioned technical problems, the present invention aims to provide a tetrahydrophthalic anhydride production apparatus. This addresses the issue that, in the actual tetrahydrophthalic anhydride production process described in the background art, existing structures typically require extracting butadiene gas to stop the reaction between maleic anhydride and butadiene, then reopening the reaction vessel to sample and test the reaction product, tetrahydrophthalic anhydride. This sampling process is cumbersome and slow, severely impacting overall production and hindering the efficient utilization of gaseous butadiene, leading to resource waste and hindering daily operation.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution: a tetrahydrophthalic anhydride production apparatus, comprising a stabilizing sleeve, a cross support frame fixedly connected to the top of the inner wall of the stabilizing sleeve, a top connecting shaft disposed at the center of the cross support frame, a connecting seat connected to the bottom end of the top connecting shaft, a first docking seat fixedly connected to the bottom of the connecting seat, connecting rods fixedly connected to both sides of the first docking seat, a first U-shaped side frame fixedly connected to one side of the first docking seat via a connecting rod, a second U-shaped side frame fixedly connected to the other side of the first docking seat via a connecting rod, rotating ring seats fixedly connected to both ends of the first U-shaped side frame and the second U-shaped side frame, a top block disposed at the bottom of the rotating ring seat, a reaction vessel fixedly connected to the bottom end of the top block, a base fixedly connected to the bottom end of the reaction vessel, a motor frame fixedly connected to the bottom end of the base, a drive motor disposed inside the motor frame, and a second docking seat fixedly connected to one end of the drive motor.

[0007] Preferably, the second docking seat is provided with a top-fixing spring inside, the top of the top-fixing spring is fixedly connected to a top-fixing base, and the surface of the top-fixing base is provided with a top-fixing arc groove.

[0008] Preferably, a rotating rod is provided between the first docking seat and the second docking seat, and a sleeve seat is sleeved at both ends of the rotating rod. An electric push rod is provided inside the upper and lower ends of the rotating rod, and a connecting ring seat is uniformly fixedly connected to the side of the rotating rod.

[0009] Preferably, side rods are fixedly connected to both sides of the connecting ring seat, and a shrinkage baffle is fixedly connected to the bottom of the side rods. A shrinkage spring is provided inside the shrinkage baffle, and a scraper tooth block is fixedly connected to one end of the shrinkage spring.

[0010] Preferably, the side of the reaction vessel is provided with a plug-in groove, and the inside of the plug-in groove is provided with a double door.

[0011] Preferably, the inside of the stabilizing sleeve is provided with a ventilation slot, and the inner wall of the reaction vessel is provided with a ventilation grid.

[0012] Preferably, a bidirectional pump is provided on the side of the first U-shaped side frame and the second U-shaped side frame, a storage pipe is provided at one end of the bidirectional pump, a refrigeration unit is provided at the top of the storage pipe, and an electric heating base is provided at the bottom of the storage pipe.

[0013] Preferably, a sliding seat is fixedly connected to the side of the stabilizing sleeve, a sliding frame is movably connected inside the sliding seat, a material-gathering insert plate is uniformly fixedly connected to the back of the sliding frame, and a plug-in top seat is fixedly connected to the upper and lower ends of the back of the sliding frame.

[0014] Preferably, an adjustment block is fixedly connected to the top of the sliding frame, limit blocks are fixedly connected to the four corners of the side of the sliding frame, and limit grooves are formed at the four corners of the side of the sliding seat.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This tetrahydrophthalic anhydride production unit, through its stabilizing frame, first docking seat, connecting rod, first U-shaped side frame, second U-shaped side frame, rotating ring seat, top block, reaction tank, base, motor frame, drive motor, insertion slot, double door, venting slot, venting grid, bidirectional pump, storage pipe, sliding seat, and sliding frame, can more efficiently complete the sampling work of tetrahydrophthalic anhydride during production. In actual use, the operator first evenly spreads the maleic anhydride raw material to be processed on each tray inside the reaction tank, and then places the butadiene raw material separately... The material is placed inside the storage pipe connected to the sides of the first and second U-shaped side frames. Then, the drive motor inside the motor frame is started, causing it to rotate the second docking seat as a whole. This allows the first and second U-shaped side frames to rotate stably around the rotating ring seats at the upper and lower ends of the top block and base. Then, the refrigerators and heating pads at the upper and lower ends of the two sets of storage pipes are started in a staggered manner, and two sets of bidirectional pumps are started to perform opposite gas extraction and release operations on the first and second U-shaped side frames, allowing butadiene gas to be released. The process involves exchanging materials within two sets of storage pipes. This ensures that butadiene gas is introduced into one storage pipe and reacts uniformly with maleic anhydride inside the reaction vessel. Meanwhile, the opposite storage pipe absorbs butadiene gas, which is then condensed back into crystals using a refrigeration unit. Simultaneously, when butadiene gas is introduced into the reaction vessel, it enters evenly through the venting grille via the venting slot. Furthermore, the extraction of butadiene gas is more uniform and stable, improving the reaction efficiency between butadiene gas and maleic anhydride. This allows for further processing when necessary. When removing the tetrahydrophthalic anhydride sample, the sliding frame inside the sliding seat can be extended towards the reaction vessel. The double door inside the insertion slot can be pushed open from the outside and aligned with the insertion slot of the reaction vessel. Then, the first or second U-shaped side frame for evacuation can be rotated to the side of the sliding frame. Butadiene gas evacuation can be continuously performed on the side of the sliding frame, assisting the staff in quickly removing the tetrahydrophthalic anhydride sample from inside the reaction vessel. After removal, the sliding frame can be pulled back. This process will not affect the tetrahydrophthalic anhydride production process, demonstrating the practicality of the equipment design.

[0017] This tetrahydrophthalic anhydride production unit, through the installation of a stabilizing sleeve, cross support frame, top connecting shaft, first docking seat, second docking seat, top fixing spring, top fixing seat, top fixing arc groove, rotating rod, sleeve seat, electric push rod, connecting ring seat, side rod, shrinkage baffle, shrinkage spring, scraper teeth, sliding frame, and polymer insert plate, further improves the overall performance. During daily operation, when maleic anhydride raw material is placed into the reaction tank, the operator can activate the electric push rod at the bottom of the rotating rod to align it with the second docking seat. This causes the rotating rod to rotate synchronously with the second docking seat. The scraper teeth at the bottom of the shrinkage baffle quickly and evenly scrape the maleic anhydride raw material, achieving rapid and even distribution of the raw material inside the reaction tank while awaiting the reaction of butadiene. Once the tetrahydrophthalic anhydride reaction is complete, the electric push rod at the top of the rotating rod is activated. The rod is rotated so that its electric push rod engages with the first docking seat. Then, the electric push rod at the bottom of the rotating rod engages with the top-fixing arc groove of the top-fixing seat, causing the top-fixing seat as a whole to compress the top-fixing spring on the inner wall of the second docking seat, realizing the downward translation of the rotating rod as a whole. The sleeve seat ensures the stability of the rotating rod after its overall movement. At this time, the scraper teeth press against the tray inside the reaction tank, and the shrinkage spring inside the shrinkage baffle causes it to shrink inward, so that the side of the shrinkage baffle makes direct contact with the tetrahydrophthalic anhydride. Then, as the rotating rod rotates, it quickly scrapes the tetrahydrophthalic anhydride product that is evenly spread on the tray inside the reaction tank. Finally, all the tetrahydrophthalic anhydride product can flow directly from the polymer insert plate into the interior of the sliding frame and be quickly discharged from the sliding seat for subsequent reprocessing, improving the overall reaction efficiency and demonstrating the comprehensiveness of the equipment design. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the structure of the present invention;

[0019] Figure 2 This is an overall schematic diagram of the reaction vessel structure of the present invention;

[0020] Figure 3 This is a schematic diagram showing the separation of the first U-shaped side frame and the second U-shaped side frame structure of the present invention;

[0021] Figure 4 This is an overall schematic diagram of the reaction vessel structure of the present invention;

[0022] Figure 5 This is an overall schematic diagram of the sliding frame structure of the present invention;

[0023] Figure 6 This is an overall schematic diagram of the motor frame structure of the present invention;

[0024] Figure 7 This is an overall schematic diagram of the structure of the first docking seat and the second docking seat of the present invention;

[0025] Figure 8 This is a split view schematic diagram of the retractable baffle structure of the present invention.

[0026] In the diagram: 1. Stabilizing sleeve; 2. Cross support frame; 3. Top connecting shaft; 4. Connecting seat; 5. First docking seat; 6. Connecting rod; 7. First U-shaped side frame; 8. Second U-shaped side frame; 9. Rotating ring seat; 10. Top block; 11. Reaction vessel; 12. Base; 13. Motor frame; 14. Drive motor; 15. Second docking seat; 16. Top fixing spring; 17. Top fixing seat; 18. Top fixing arc groove; 19. Rotating rod; 20. Sleeve seat; 21. 21. Electric push rod; 22. Connecting ring seat; 23. Side rod; 24. Retraction baffle; 25. Retraction spring; 26. Scraper tooth block; 27. Insertion slot; 28. Double door; 29. ​​Ventilation slot; 30. Ventilation grille; 31. Two-way pump; 32. Storage pipe; 33. Refrigeration unit; 34. Electric heating base; 35. Sliding seat; 36. Sliding frame; 37. Material gathering plate; 38. Insertion top seat; 39. Control block; 40. Limiting block; 41. Limiting slot. Detailed Implementation

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

[0028] Please see Figure 1-8One embodiment of the present invention provides a tetrahydrophthalic anhydride production apparatus, comprising a stabilizing sleeve 1, a cross support frame 2 fixedly connected to the top of the inner wall of the stabilizing sleeve 1, a top connecting shaft 3 disposed at the center of the cross support frame 2, a connecting seat 4 connected to the bottom end of the top connecting shaft 3, a first docking seat 5 fixedly connected to the bottom of the connecting seat 4, connecting rods 6 fixedly connected to both sides of the first docking seat 5, a first U-shaped side frame 7 fixedly connected to one side of the first docking seat 5 via the connecting rod 6, and the other side of the first docking seat 5... A second U-shaped side frame 8 is fixedly connected to the connecting rod 6. Rotating ring seats 9 are fixedly connected to both ends of the first U-shaped side frame 7 and the second U-shaped side frame 8. A ventilation slot 29 is provided inside the stabilizing sleeve 1. A ventilation grille 30 is provided on the inner wall of the reaction tank 11. A bidirectional pump 31 is provided on the sides of the first U-shaped side frame 7 and the second U-shaped side frame 8. A storage pipe 32 is provided at one end of the bidirectional pump 31. A refrigerator 33 is provided at the top of the storage pipe 32, and an electric heating base 34 is provided at the bottom of the storage pipe 32. A sliding seat 35 is fixedly connected to the side of the frame 1. A sliding frame 36 is movably connected inside the sliding seat 35. A material insertion plate 37 is uniformly fixedly connected to the back of the sliding frame 36. A plug-in top seat 38 is fixedly connected to the upper and lower ends of the back of the sliding frame 36. An adjustment block 39 is fixedly connected to the top of the sliding frame 36. Limiting blocks 40 are fixedly connected to the four corners of the side of the sliding frame 36. Limiting grooves 41 are opened at the four corners of the side of the sliding seat 35. By staggering the start of the refrigerators 33 and electric heating bases 34 at the upper and lower ends of the two sets of storage pipes 32, and by starting the two sets of bidirectional pumps 31, the gas is pumped and discharged in opposite directions in the first U-shaped side frame 7 and the second U-shaped side frame 8, so that the butadiene gas can be exchanged inside the two sets of storage pipes 32. This ensures that the butadiene gas is put into one side of the storage pipe 32 and reacts uniformly with the maleic anhydride inside the reaction tank 11. The butadiene gas is absorbed in the storage pipe 32 at the opposite corner. The butadiene gas is condensed into crystals again by the refrigerator 33.

[0029] A top block 10 is provided at the bottom of the rotating ring seat 9. A reaction vessel 11 is fixedly connected to the bottom end of the top block 10. A base 12 is fixedly connected to the bottom end of the reaction vessel 11. A motor frame 13 is fixedly connected to the bottom end of the base 12. A drive motor 14 is provided inside the motor frame 13. A second docking seat 15 is fixedly connected to one end of the drive motor 14. A top-fixing spring 16 is provided inside the second docking seat 15. A top-fixing seat 17 is fixedly connected to the top end of the top-fixing spring 16. A top-fixing arc groove 18 is opened on the surface of the top-fixing seat 17. A rotating rod 19 is provided between the first docking seat 5 and the second docking seat 15. A sleeve seat 20 is sleeved at both ends of the rotating rod 19. An electric push rod 21 is provided inside the upper and lower ends of the rotating rod 19. A connecting ring seat 22 is evenly fixedly connected to the side of the rotating rod 19. Side rods 23 are fixedly connected to both sides of the connecting ring seat 22. A shrinkage baffle 24 is fixedly connected to the bottom of the side rod 23. The frame 24 is equipped with a contraction spring 25, one end of which is fixedly connected to a scraper tooth block 26. The side of the reaction tank 11 is provided with an insertion groove 27, and the insertion groove 27 is provided with a double door 28. The electric push rod 21 at the top of the rotating rod 19 is activated, so that the electric push rod 21 abuts against the first docking seat 5. Then, the electric push rod 21 at the bottom of the rotating rod 19 abuts against the top fixing arc groove 18 of the top fixing seat 17, and the top fixing seat 17 compresses the top fixing spring 16 on the inner wall of the second docking seat 15, so that the rotating rod 19 moves downward. The sleeve seat 20 ensures the stability of the rotating rod 19 after it moves. At this time, the scraper tooth block 26 presses against the tray inside the reaction tank 11, and the contraction spring 25 inside the contraction baffle 24 retracts into the contraction baffle 24, so that the side of the contraction baffle 24 comes into direct contact with tetrahydrophthalic anhydride.

[0030] Working Principle: During operation, the operator first evenly spreads the maleic anhydride raw material to be processed on each tray inside the reaction vessel 11. Butadiene raw material is then placed inside the storage pipes 32 connected to the sides of the first U-shaped side frame 7 and the second U-shaped side frame 8. Next, the drive motor 14 inside the motor frame 13 is started, causing the second docking seat 15 to rotate. This allows the first U-shaped side frame 7 and the second U-shaped side frame 8 to rotate stably around the rotating ring seats 9 at the upper and lower ends of the top block 10 and the base 12. Then, the chillers 33 and heating seats 34 at the upper and lower ends of the two sets of storage pipes 32 are started in a staggered manner. Finally, two sets of bidirectional pumps 31 are started, and the first U-shaped side frame 7 and the second U-shaped side frame 8 are rotated in a phase-dependent manner. The reverse gas extraction and release operation allows butadiene gas to exchange within the two sets of storage pipes 32. This ensures that butadiene gas is introduced into one storage pipe 32 and reacts uniformly with maleic anhydride inside the reaction vessel 11, while the opposite storage pipe 32 absorbs butadiene gas. The butadiene gas is then condensed back into crystals by the refrigerator 33. Simultaneously, when butadiene gas is introduced into the reaction vessel 11, it can enter the interior of the reaction vessel 11 uniformly through the venting slot 29 and the venting grid 30. Furthermore, the extraction of butadiene gas is more uniform and stable, improving the reaction efficiency between butadiene gas and maleic anhydride. When it is necessary to remove the tetrahydrophthalic anhydride sample, the sliding frame 36 inside the sliding seat 35 can be extended towards the reverse... At reactor 11, push open the double door 28 inside the insertion slot 27 from the outside and align it with the insertion slot 27 at reactor 11. Then, the first U-shaped side frame 7 or the second U-shaped side frame 8 can be rotated to the side of the sliding frame 36. Continue to pump butadiene gas from the side of the sliding frame 36 to assist the operator in quickly removing the tetrahydrophthalic anhydride sample from inside reactor 11. After removal, simply pull back the sliding frame 36. This will not affect the tetrahydrophthalic anhydride production process. In daily use, when placing maleic anhydride raw material into reactor 11, the operator can activate the electric push rod 21 at the bottom of the rotating rod 19 to align it with the second docking seat 15, thus allowing the rotating rod 19 to... The entire assembly rotates synchronously with the second docking seat 15. The scraping teeth 26 at the bottom of the retractable baffle 24 rapidly and evenly spread the maleic anhydride raw material inside the reaction vessel 11, awaiting the reaction of butadiene. Once the tetrahydrophthalic anhydride has completed its reaction, the electric push rod 21 at the top of the rotating rod 19 is activated, causing it to engage with the first docking seat 5. Then, the electric push rod 21 at the bottom of the rotating rod 19 engages with the top-fixing groove 18 of the top-fixing seat 17, compressing the top-fixing spring 16 on the inner wall of the second docking seat 15. This causes the rotating rod 19 to move downwards. The sleeve seat 20 ensures the stability of the rotating rod 19 after its movement.At this time, the scraper teeth 26 press against the tray inside the reaction vessel 11, and the shrinkage spring 25 inside the shrinkage baffle 24 shrinks the baffle 24 inward, making direct contact between the side of the shrinkage baffle 24 and the tetrahydrophthalic anhydride. Then, as the rotating rod 19 rotates, the tetrahydrophthalic anhydride product evenly spread on the tray inside the reaction vessel 11 is quickly scraped off. Finally, all the tetrahydrophthalic anhydride product can flow directly from the polymer insert plate 37 into the interior of the sliding frame 36, and quickly exit from the sliding seat 35 for subsequent reprocessing, improving the overall reaction efficiency. The above is the complete working principle of this invention.

[0031] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A tetrahydrophthalic anhydride production plant comprising a stabilizing jacket (1), characterized in that: A cross support frame (2) is fixedly connected to the top of the inner wall of the stabilizing sleeve (1). A top connecting shaft (3) is provided at the center of the cross support frame (2). A connecting seat (4) is connected to the bottom of the top connecting shaft (3). A first docking seat (5) is fixedly connected to the bottom of the connecting seat (4). Connecting rods (6) are fixedly connected to both sides of the first docking seat (5). A first U-shaped side frame (7) is fixedly connected to one side of the first docking seat (5) through the connecting rod (6). A second U-shaped side frame (7) is fixedly connected to the other side of the first docking seat (5) through the connecting rod (6). Side frame (8), the first U-shaped side frame (7) and the second U-shaped side frame (8) are fixedly connected to the two ends of the rotating ring seat (9), the bottom of the rotating ring seat (9) is provided with a top block (10), the bottom end of the top block (10) is fixedly connected to the reaction tank (11), the bottom end of the reaction tank (11) is fixedly connected to the base (12), the bottom end of the base (12) is fixedly connected to the motor frame (13), the motor frame (13) is provided with a drive motor (14), and one end of the drive motor (14) is fixedly connected to a second docking seat (15); A bidirectional pump (31) is provided on the side of the first U-shaped side frame (7) and the second U-shaped side frame (8). A storage pipe (32) is provided at one end of the bidirectional pump (31). A refrigerator (33) is provided at the top of the storage pipe (32). An electric heating base (34) is provided at the bottom of the storage pipe (32). The side of the stabilizing sleeve (1) is fixedly connected to a sliding seat (35), the inside of the sliding seat (35) is movably connected to a sliding frame (36), the back of the sliding frame (36) is evenly fixedly connected to a material-gathering insert plate (37), and the upper and lower ends of the back of the sliding frame (36) are fixedly connected to a plug-in top seat (38). The top of the sliding frame (36) is fixedly connected to an adjustment block (39), the four corners of the side of the sliding frame (36) are fixedly connected to limit blocks (40), and the four corners of the side of the sliding seat (35) are provided with limit grooves (41).

2. A device for producing tetrahydrophthalic anhydride according to claim 1, characterized in that: The second docking seat (15) is provided with a top-fixing spring (16) inside. The top of the top-fixing spring (16) is fixedly connected to a top-fixing seat (17). The surface of the top-fixing seat (17) is provided with a top-fixing arc groove (18).

3. A device for producing tetrahydrophthalic anhydride according to claim 1, characterized in that: A rotating rod (19) is provided between the first docking seat (5) and the second docking seat (15). The two ends of the rotating rod (19) are fitted with a sleeve seat (20). An electric push rod (21) is provided inside the upper and lower ends of the rotating rod (19). A connecting ring seat (22) is uniformly fixedly connected to the side of the rotating rod (19).

4. A device for the production of tetrahydrophthalic anhydride according to claim 3, characterized in that: Side rods (23) are fixedly connected to both sides of the connecting ring seat (22). A shrinkage baffle (24) is fixedly connected to the bottom of the side rods (23). A shrinkage spring (25) is provided inside the shrinkage baffle (24). A scraper tooth block (26) is fixedly connected to one end of the shrinkage spring (25).

5. A tetrahydrophthalic anhydride production apparatus according to claim 1, characterized in that: The side of the reaction vessel (11) is provided with a plug-in groove (27), and the inside of the plug-in groove (27) is provided with a double door (28).

6. A tetrahydrophthalic anhydride production apparatus according to claim 1, characterized in that: The stabilizing sleeve (1) has a ventilation slot (29) inside, and the inner wall of the reaction vessel (11) is provided with a ventilation grid (30).

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