Recovery device for antioxidant 1520 production catalyst

Abstract

The invention belongs to the field of antioxidant production, particularly relates to an antioxidant 1520 production catalyst recovery device, and provides the following scheme aiming at the problem that the sewage treatment difficulty is increased because ammonia nitrogen and COD (Chemical Oxygen Demand) in wastewater exceed standards due to the fact that a direct washing process is adopted in the prior art and a solvent and a catalyst are directly substituted into the wastewater. A reaction kettle, a washing kettle, a rectifying tower, a condenser, a reflux ratio controller, a buffer tank and a receiving tank are sequentially and fixedly arranged at the top of the frame, kettle covers are hermetically mounted at the tops of the reaction kettle and the washing kettle through bolts, the reflux ratio controller is provided with two output ports, and a reboiler is arranged at the bottom of the rectifying tower. According to the method, the amine catalyst and the solvent methanol are directly distilled out and recycled by adopting a direct rectification mode, and the byproduct water and the product are continuously remained in the kettle for washing, so that the catalyst and the solvent can be repeatedly recycled, the COD (Chemical Oxygen Demand) and ammonia nitrogen content in the washing water can be effectively reduced, and the use amount of the washing water can be reduced.

Description

Technical Field

[0001] This invention relates to the field of antioxidant production technology, and in particular to a catalyst recovery device for antioxidant 1520 production. Background Technology

[0002] Antioxidant 1520 (chemical name 2,4-di(n-octylthionyl)-6-methylphenol) was synthesized by using o-cresol, n-octylthiol and paraformaldehyde as raw materials, and piperidine as catalyst, under nitrogen protection via a condensation reaction.

[0003] Currently, the synthesis process of 1520 antioxidant uses catalysts such as dimethylamine and diethylamine, and solvents such as methanol. After the reaction, the product is transferred to the receiving vessel. However, in industrial production, a direct water washing process is often used, which directly introduces the solvent and catalyst into the wastewater, resulting in excessive ammonia nitrogen and COD in the wastewater and increasing the difficulty of wastewater treatment.

[0004] To address the aforementioned problems, this invention proposes a catalyst recovery device for the production of antioxidant 1520, which solves the problems mentioned above. Summary of the Invention

[0005] This invention provides a catalyst recovery device for the production of antioxidant 1520, which solves the problem of the shortcomings of the existing technology that uses direct water washing, which directly introduces solvent and catalyst into the wastewater, resulting in excessive ammonia nitrogen and COD in the wastewater and increasing the difficulty of wastewater treatment.

[0006] This invention provides the following technical solution: An antioxidant 1520 production catalyst recovery device includes: The frame has a reactor, a washing vessel, a distillation column, a condenser, a reflux ratio controller, a buffer tank, and a receiving tank fixedly mounted on its top in sequence. The tops of the reactor and the washing vessel are sealed with lids by bolts. The reflux ratio controller has two output ports, and the bottom of the distillation column is equipped with a reboiler.

[0007] In one possible design, a pneumatic diaphragm pump I is fixedly installed at the top of the frame between the reaction vessel and the washing vessel, a connecting pipe I is fixedly connected to the bottom of the reaction vessel, one end of the connecting pipe I is fixedly connected to the input end of the pneumatic diaphragm pump I, the output end of the pneumatic diaphragm pump I is fixedly connected to the connecting pipe II, and the other end of the connecting pipe II is fixedly connected to the upper side of the washing vessel.

[0008] In one possible design, a pneumatic diaphragm pump II is fixedly installed at the top of the frame between the washing vessel and the distillation column. A connecting pipe III is fixedly connected to the bottom of the washing vessel. The other end of the connecting pipe III is fixedly connected to the input end of the pneumatic diaphragm pump II. A connecting pipe IV is fixedly connected to the output end of the pneumatic diaphragm pump II. The other end of the connecting pipe IV is fixedly connected to one side of the middle section of the distillation column. A connecting pipe XII is fixedly connected to the bottom of the distillation column. The other end of the connecting pipe XII is fixedly connected to one side of the bottom of the washing vessel.

[0009] In one possible design, the top of the distillation column is fixedly connected to a connecting pipe V, which is fixedly connected to the input end of the condenser. The upper side of the distillation column is fixedly connected to a connecting pipe VIII, which is fixedly connected to one of the output ports of the reflux ratio controller.

[0010] In one possible design, the output end of the condenser is fixedly connected to a connecting pipe VI, the other end of the connecting pipe VI is connected to the top of the buffer tank, the bottom of the buffer tank is fixedly connected to a connecting pipe VII, and the other end of the connecting pipe VII is fixedly connected to the input port of the reflux ratio controller.

[0011] In one possible design, another output port of the reflux ratio controller is fixedly connected to a connecting pipe IX, the other end of which is fixedly connected to the top of the receiving tank.

[0012] In one possible design, the bottom of the receiving tank is fixedly connected to a connecting pipe X, the top of the frame is fixedly connected to a pneumatic diaphragm pump III, the other end of the connecting pipe X is fixedly connected to the input end of the pneumatic diaphragm pump III, the output end of the pneumatic diaphragm pump III is fixedly connected to a connecting pipe XI, and the other end of the connecting pipe XI is fixedly connected to the upper side of the reactor.

[0013] In one possible design, a rotating column is rotatably and sealingly installed at the top of each of the two vessel lids. A hollow tube is fixedly installed at the bottom of the rotating column. Multiple rotating rods are rotatably and longitudinally installed on the hollow tube. Stirring blades are fixedly installed at both ends of the multiple rotating rods. A linkage frame is fixedly installed inside the multiple rotating rods. A common connecting rod is hinged to one side of the multiple linkage frames. An electric push rod is fixedly installed on the top wall of the hollow tube. The output end of the electric push rod is hinged to the top of the connecting rod. A motor is fixedly installed at the top of each of the two vessel lids. The output shafts of the two motors are respectively fixedly connected to the top of the two rotating columns.

[0014] In one possible design, the interior of the distillation column is fixedly arranged with multiple trays that are evenly distributed.

[0015] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the invention.

[0016] The beneficial effects of this invention are as follows: In this invention, the amine catalyst and solvent methanol are directly distilled off and reused, while the by-product water and product remain in the reactor for washing. This not only allows for the reuse of the catalyst and solvent, but also effectively reduces the COD and ammonia nitrogen content in the washing water and reduces the amount of washing water used. Attached Figure Description

[0017] Figure 1 This is a schematic front view of a catalyst recovery device for antioxidant 1520 production provided in an embodiment of the present invention; Figure 2 This is a side view of a catalyst recovery device for antioxidant 1520 production provided in an embodiment of the present invention; Figure 3 This is a rear view schematic diagram of an antioxidant 1520 production catalyst recovery device provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the disassembled structure of the reactor lid of an antioxidant 1520 production catalyst recovery device provided in an embodiment of the present invention; Figure 5 This is a schematic cross-sectional view of a hollow tube structure of an antioxidant 1520 production catalyst recovery device provided in an embodiment of the present invention; Figure 6 This is a cross-sectional view of the distillation column of an antioxidant 1520 production catalyst recovery device provided in an embodiment of the present invention.

[0018] Figure label: 1. Frame; 2. Reactor; 3. Washing vessel; 4. Distillation column; 401. Tray; 5. Condenser; 6. Reflux ratio controller; 7. Buffer tank; 8. Receiving tank; 9. Connecting pipe I; 10. Pneumatic diaphragm pump I; 11. Connecting pipe II; 12. Connecting pipe III; 13. Pneumatic diaphragm pump II; 14. Connecting pipe IV; 15. Connecting pipe V; 16. Connecting pipe VI; 17. Connecting pipe VII; 18. Connecting pipe VIII; 19. Connecting pipe IX; 20. Connecting pipe X; 21. Pneumatic diaphragm pump III; 22. Connecting pipe XI; 23. Connecting pipe XII; 24. Reactor lid; 25. Rotating column; 26. Hollow tube; 27. Rotating rod; 28. Stirring blade; 29. ​​Linkage frame; 30. Connecting rod; 31. Electric push rod; 32. Motor. Detailed Implementation

[0019] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0020] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the devices are connected to each other and their relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of the present invention, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, and are not intended to 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 the embodiments of the present invention.

[0021] In this embodiment of the invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0022] In this embodiment of the invention, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0023] References to "one embodiment" or "some embodiments" as used in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the invention. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically emphasized.

[0024] Example 1 Reference Figure 1-6 An antioxidant 1520 production catalyst recovery device, comprising: Frame 1 provides support and a fixed foundation for the entire device. The top of the frame is fixedly installed in a specific order, including reactor 2, washing vessel 3, distillation column 4, condenser 5, reflux ratio controller 6, buffer tank 7, and receiving tank 8. The tops of reactor 2 and washing vessel 3 are sealed with lids 24 by bolts to ensure the sealing during the reaction process and prevent material leakage.

[0025] At the top of frame 1, a pneumatic diaphragm pump I10 is fixedly installed between reactor 2 and washing vessel 3. A connecting pipe I9 is ​​fixedly connected to the bottom of reactor 2. One end of connecting pipe I9 is ​​fixedly connected to the input end of pneumatic diaphragm pump I10, and the output end of pneumatic diaphragm pump I10 is fixedly connected to connecting pipe II11. The other end of connecting pipe II11 is fixedly connected to the upper side of washing vessel 3. After the polymerization reaction is completed in reactor 2, the operator turns off the heating system through the control panel and uses the jacketed circulating cooling water to cool the inside of the reactor. Then, the exhaust valve at the top of reactor 2 is slowly opened to release pressure to atmospheric pressure. At this time, pneumatic diaphragm pump I10 is started. The mixture at the bottom of reactor 2 (containing product, dimethylamine, diethylamine, methanol and by-product water) enters pneumatic diaphragm pump I10 through connecting pipe I9, and is then transported to washing vessel 3 through connecting pipe II11. During the transportation process, the flow rate is monitored by a flow meter to avoid material sedimentation or splashing.

[0026] A pneumatic diaphragm pump II 13 is fixedly installed at the top of frame 1 between the washing vessel 3 and the distillation column 4. A connecting pipe III 12 is fixedly connected to the bottom of the washing vessel 3, with the other end of III 12 fixedly connected to the input end of the pneumatic diaphragm pump II 13. A connecting pipe IV 14 is fixedly connected to the output end of the pneumatic diaphragm pump II 13, with the other end of IV 14 fixedly connected to one side of the middle section of the distillation column 4. A connecting pipe XII 23 is fixedly connected to the bottom of the distillation column 4, with the other end of XII 23 fixedly connected to one side of the bottom of the washing vessel 3. After the mixed liquid enters the washing vessel 3, the operator closes the relevant valves via the control panel and starts the motor 32 on top of the vessel cover 24. The output shaft of the motor 32 drives the rotating column 25 to rotate. The hollow tube 26 fixed at the bottom of the rotating column 25 also rotates, and the multiple rotating rods 27 longitudinally running through the hollow tube 26 rotate as well, driving the stirring blades 28 on them to rotate synchronously, stirring the objects in the washing tank 3 (when it is necessary to reduce the stirring shear force and avoid product breakage, the output end of the electric push rod 31 is controlled to retract, pulling the connecting rod 30 to move upward, and the connecting rod 30 pulls the rotating rod 27 to rotate, so that the stirring blades 28 are adjusted to a suitable angle to reduce the shear force during the stirring process). Then the pneumatic diaphragm pump II 13 is started, and the mixture at the bottom of the washing tank 3 enters the pneumatic diaphragm pump II 13 through the connecting pipe III 12, and is then transported to the feed port on one side of the middle of the distillation column 4 through the connecting pipe IV 14.

[0027] The top of the distillation column 4 is fixedly connected to a connecting pipe V15, which is fixedly connected to the input end of the condenser 5. The upper side of the distillation column 4 is fixedly connected to a connecting pipe VIII18, which is fixedly connected to one of the output ports of the reflux ratio controller 6. The interior of the distillation column 4 is longitudinally fixedly provided with multiple uniformly distributed trays 401, which provide a space for the gas-liquid contact interface. The reboiler at the bottom of the distillation column 4 heats the light components (dimethylamine, diethylamine, methanol) to vaporize and rise, while the heavy components (water, products) flow back to the bottom of the column along the trays 401. The vapor at the top of the column enters the condenser 5 through the connecting pipe V15, exchanges heat with the external chilled brine, and condenses into liquid, which flows into the buffer tank 7 through the connecting pipe VI16.

[0028] The output end of the condenser 5 is fixedly connected to a connecting pipe VI16. The other end of the connecting pipe VI16 is connected to the top of the buffer tank 7. The bottom of the buffer tank 7 is fixedly connected to a connecting pipe VII17. The other end of the connecting pipe VII17 is fixedly connected to the input port of the reflux ratio controller 6. The reflux ratio controller 6 is provided with two output ports. One output port is connected to the upper side of the distillation column 4 through a connecting pipe VIII18. The other output port is fixedly connected to a connecting pipe IX19. The other end of the connecting pipe IX19 is fixedly connected to the top of the receiving tank 8. The liquid in the buffer tank 7 enters the reflux ratio controller 6 through the bottom connecting pipe VII17. The controller distributes the liquid according to a preset ratio (such as 4:1). Part of it flows back to the top of the distillation column 4 through the connecting pipe VIII18 to maintain the gas-liquid balance in the column. The other part flows into the receiving tank 8 through the connecting pipe IX19 as a recovered catalyst and solvent mixture. The dual output port design of the reflux ratio controller 6 realizes the dynamic adjustment of reflux and collection, ensuring distillation efficiency and product purity.

[0029] The bottom of the receiving tank 8 is fixedly connected to a connecting pipe X20, and the top of the frame 1 is fixedly connected to a pneumatic diaphragm pump III21. The other end of the connecting pipe X20 is fixedly connected to the input end of the pneumatic diaphragm pump III21, and the output end of the pneumatic diaphragm pump III21 is fixedly connected to a connecting pipe XI22. The other end of the connecting pipe XI22 is fixedly connected to the upper side of the reactor 2. If the catalyst and solvent mixture recovered in the receiving tank 8 meets the standards, it can be directly reused. If it contains trace impurities, it can be dehydrated by an external molecular sieve drying tower and then used for later use. When reusing, the pneumatic diaphragm pump III21 is started. The mixture at the bottom of the receiving tank 8 enters the pneumatic diaphragm pump III21 through the connecting pipe X20, and then is transported to the upper side of the reactor 2 through the connecting pipe XI22. It is then mixed with fresh solvent at a ratio of 4:1 and added to the next batch of reaction.

[0030] Example 2 Based on Example 1, Example 2 also includes Reference Figure 5 An antioxidant 1520 production catalyst recovery device, comprising: Both lids 24 have a sealed, rotatable rotating column 25 (with a cylindrical battery embedded inside the rotating column 25, electrically connected to an electric push rod 31). A hollow tube 26 is fixedly installed at the bottom of the rotating column 25. Multiple rotating rods 27 are longitudinally rotatable along the hollow tube 26. Stirring blades 28 are fixedly installed at both ends of each rotating rod 27. A linkage frame 29 is fixedly installed inside each rotating rod 27 within the hollow tube 26. A common connecting rod 30 is hinged to one side of each linkage frame 29. The top wall of the hollow tube 26... An electric push rod 31 is fixedly installed, and the output end of the electric push rod 31 is hinged to the top of the connecting rod 30. A motor 32 is fixedly installed on the top of each of the two vessel covers 24. The output shafts of the two motors 32 are fixedly connected to the top of the two rotating columns 25 respectively. During the stirring process of the reaction vessel 2 and the washing vessel 3, the motor 32 drives the rotating column 25, the hollow tube 26, the rotating rod 27 and the stirring blade 28 to rotate to achieve the stirring function. The electric push rod 31 adjusts the angle of the rotating rod 27 and the stirring blade 28 through the connecting rod 30 and the linkage frame 29 to meet different stirring requirements.

[0031] However, as is well known to those skilled in the art, the working principles and wiring methods of the reaction vessel 2, water washing vessel 3, distillation column 4, condenser 5, reflux ratio controller 6, pneumatic diaphragm pump I 10, pneumatic diaphragm pump II 13, pneumatic diaphragm pump III 21, electric push rod 31 and motor 32 are commonplace and belong to conventional means or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0032] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0033] The working principle and usage process of this technical solution are as follows: In the production process of antioxidant 1520, the operation of the catalyst recovery device begins at the reaction termination stage in reactor 2. (During the reaction stage, the output shaft of motor 32 and motor 23 on reactor 2 drives the hollow tube 26 fixed at the bottom of the rotating column 25 to rotate as well. Multiple evenly distributed rotating rods 27, which are longitudinally rotatably mounted on the hollow tube 26, also rotate, simultaneously driving the stirring blades 28 on them to rotate synchronously, thereby stirring the contents of reactor 2. During the stirring process, according to the reaction of the product in reactor 2, the electric push rod 31 is activated. The output end of the electric push rod 31 extends and pushes the connecting rod 30 downward. The connecting rod 30 pushes the rotating rod 27 to rotate, causing the stirring blades 28 to tilt.) The angle of inclination changes, thereby enhancing the axial flow during stirring. After the polymerization reaction is completed in reactor 2, the operator turns off the heating system through the control panel and cools the reactor by circulating cooling water through the jacket. Then, the exhaust valve at the top of reactor 2 is slowly opened to release pressure to atmospheric pressure. At this time, the pneumatic diaphragm pump I10 located at the top of frame 1 between reactor 2 and water washing tank 3 is started. The connecting pipe I9 at the bottom of reactor 2 pumps the mixture (containing product, dimethylamine, diethylamine, methanol and by-product water) into the pneumatic diaphragm pump I10, and delivers it to the side above water washing tank 3 through connecting pipe II11 and enters water washing tank 3. During the delivery process, the flow rate is monitored by a flow meter to ensure the transfer rate and avoid material deposition or splashing. After the mixture enters the washing tank 3, the operator closes the relevant valves through the control panel and starts the motor 32 on the top of the tank cover 24. The output shaft of the motor 23 drives the hollow tube 26 fixed at the bottom of the rotating column 25 to rotate as well. Multiple rotating rods 27, which are evenly distributed and longitudinally mounted on the hollow tube 26, also rotate as well, driving the stirring blades 28 on them to rotate synchronously, thereby stirring the contents of the reaction tank 2. When stirring is needed again to reduce the shear force and prevent product breakage, the output end of the electric push rod 2 is controlled to retract, pulling the connecting rod 30 upward and pulling the rotating rod 27 to rotate, so that the stirring blades 28 are adjusted to a suitable angle to reduce the shear force during the stirring process. After stirring for 10-15 minutes, the motor 32 is stopped, and preparation is made for entering the distillation stage. When the distillation process starts, the pneumatic diaphragm pump II13, located at the top of frame 1 between the washing kettle 3 and the distillation column 4, starts to work. The connecting pipe III12 at the bottom of the washing kettle 3 pumps the mixture into the pneumatic diaphragm pump II13, and delivers it to the feed port on one side of the middle of the distillation column 4 through the connecting pipe IV14. Multiple trays 401 distributed longitudinally inside the distillation column 4 provide a gas-liquid contact interface. The reboiler at the bottom of the distillation column 4 heats the light components (dimethylamine, diethylamine, methanol) to vaporize and rise, while the heavy components (water, product) flow back to the bottom of the column along the tray 401. The vapor at the top of the column enters the condenser 5 through the connecting pipe V15, exchanges heat with the external chilled brine, and condenses into liquid, flowing into the buffer tank 7 through the connecting pipe VI16. The liquid in the buffer tank 7 enters the reflux ratio controller 6 through the bottom connecting pipe VII17. The controller distributes the liquid according to a preset ratio (e.g., 4:1). Part of it flows back to the top of the distillation column 4 through the connecting pipe VIII18 to maintain the gas-liquid balance in the column. The other part flows into the receiving tank 8 through the connecting pipe IX19 as a recovered catalyst and solvent mixture. The dual output port design of the reflux ratio controller 6 realizes the dynamic adjustment of reflux and collection, ensuring distillation efficiency and product purity. During the operation of distillation column 4, the heavy components at the bottom of the column are periodically discharged into the bottom of washing vessel 3 through connecting pipe XII23 to mix with the newly entered mixture. When the liquid level in washing vessel 3 rises to 80%, the feeding of distillation column 4 is stopped, and the stirring system inside the vessel is started (same as the aforementioned stirring mode). At the same time, deionized water is slowly injected from the top. During the countercurrent washing process, the catalyst and solvent remaining on the product surface dissolve in the water, forming high-concentration wastewater and low-concentration wastewater. The high-concentration wastewater is discharged through a special valve at the bottom of washing vessel 3 and discharged after the residual amine substances are recovered by the stripping tower. The low-concentration wastewater is reused in the next batch of washing process to reduce the amount of fresh water used. The catalyst and solvent mixture recovered in receiving tank 8 needs to be tested for purity and moisture content. If it meets the standards, it can be reused directly. If it contains trace impurities, it can be dehydrated by an external molecular sieve drying tower and then used for later use. When reusing, start the pneumatic diaphragm pump Ⅲ21 at the top of frame 1. The connecting pipe Ⅹ20 at the bottom of receiving tank 8 pumps the mixture into the pneumatic diaphragm pump Ⅲ21. It is then transported to the side above the reactor 2 through the connecting pipe Ⅺ22. It is mixed with fresh solvent at a ratio of 4:1 and then added to the next batch of reaction. Before reuse, the pipeline can be purged with nitrogen to prevent oxidation and degradation. At the same time, the acid value is tested regularly to ensure the stability of catalyst activity. The entire process uses reactor 2 to provide raw materials, water washing reactor 3 to complete preliminary separation and washing, distillation column 4 to achieve efficient recovery of catalyst and solvent, condenser 5, buffer tank 7 and reflux ratio controller 6 to optimize distillation parameters, and receiving tank 8 and pneumatic diaphragm pump Ⅲ21 to complete material recycling. This not only allows for the reuse of catalyst and solvent, but also effectively reduces COD and ammonia nitrogen in the washing water, reduces the amount of washing water used, and significantly reduces production costs and environmental pressure.

[0034] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. In the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A catalyst recovery device for the production of antioxidant 1520, characterized in that, include: The frame (1) is provided with a reaction vessel (2), a water washing vessel (3), a distillation column (4), a condenser (5), a reflux ratio controller (6), a buffer tank (7), and a receiving tank (8) in sequence on the top. The top of the reaction vessel (2) and the water washing vessel (3) are both sealed with a lid (24) by bolts. The reflux ratio controller (6) is provided with two output ports. The bottom of the distillation column (4) is provided with a reboiler.

2. The antioxidant 1520 production catalyst recovery device according to claim 1, characterized in that: A pneumatic diaphragm pump I (10) is fixedly installed at the top of the frame (1) between the reactor (2) and the washing vessel (3). A connecting pipe I (9) is fixedly connected to the bottom of the reactor (2). One end of the connecting pipe I (9) is fixedly connected to the input end of the pneumatic diaphragm pump I (10). A connecting pipe II (11) is fixedly connected to the output end of the pneumatic diaphragm pump I (10). The other end of the connecting pipe II (11) is fixedly connected to the upper side of the washing vessel (3).

3. The catalyst recovery device for antioxidant 1520 production according to claim 2, characterized in that: A pneumatic diaphragm pump II (13) is fixedly installed at the top of the frame (1) between the washing vessel (3) and the distillation column (4). A connecting pipe III (12) is fixedly connected to the bottom of the washing vessel (3). The other end of the connecting pipe III (12) is fixedly connected to the input end of the pneumatic diaphragm pump II (13). A connecting pipe IV (14) is fixedly connected to the output end of the pneumatic diaphragm pump II (13). The other end of the connecting pipe IV (14) is fixedly connected to one side of the middle part of the distillation column (4). A connecting pipe XII (23) is fixedly connected to the bottom of the distillation column (4). The other end of the connecting pipe XII (23) is fixedly connected to one side of the bottom of the washing vessel (3).

4. The catalyst recovery device for antioxidant 1520 production according to claim 3, characterized in that: The top of the distillation column (4) is fixedly connected to a connecting pipe V (15), which is fixedly connected to the input end of the condenser (5). The upper side of the distillation column (4) is fixedly connected to a connecting pipe VIII (18), which is fixedly connected to one of the output ports of the reflux ratio controller (6).

5. The catalyst recovery device for antioxidant 1520 production according to claim 4, characterized in that: The output end of the condenser (5) is fixedly connected to the connecting pipe VI (16), the other end of the connecting pipe VI (16) is connected to the top of the buffer tank (7), the bottom of the buffer tank (7) is fixedly connected to the connecting pipe VII (17), and the other end of the connecting pipe VII (17) is fixedly connected to the input port of the reflux ratio controller (6).

6. The catalyst recovery device for antioxidant 1520 production according to claim 1, characterized in that: Another output port of the reflux ratio controller (6) is fixedly connected to a connecting pipe IX (19), and the other end of the connecting pipe IX (19) is fixedly connected to the top of the receiving tank (8).

7. The catalyst recovery device for antioxidant 1520 production according to claim 1, characterized in that: The bottom of the receiving tank (8) is fixedly connected to a connecting pipe X (20), the top of the frame (1) is fixedly connected to a pneumatic diaphragm pump III (21), the other end of the connecting pipe X (20) is fixedly connected to the input end of the pneumatic diaphragm pump III (21), the output end of the pneumatic diaphragm pump III (21) is fixedly connected to a connecting pipe XI (22), and the other end of the connecting pipe XI (22) is fixedly connected to the upper side of the reactor (2).

8. The catalyst recovery device for antioxidant 1520 production according to claim 1, characterized in that: Both of the two vessel lids (24) are sealed and rotatably mounted with rotating columns (25). A hollow tube (26) is fixedly mounted at the bottom end of the rotating column (25). Multiple rotating rods (27) are rotatably mounted longitudinally through the hollow tube (26). Stirring blades (28) are fixedly mounted at both ends of the multiple rotating rods (27). Linkage frames (29) are fixedly mounted inside the multiple rotating rods (27) located in the hollow tube (26). A connecting rod (30) is hinged to one side of the multiple linkage frames (29). An electric push rod (31) is fixedly mounted on the top wall of the hollow tube (26). The output end of the electric push rod (31) is hinged to the top end of the connecting rod (30). A motor (32) is fixedly mounted on the top of both vessel lids (24). The output shafts of the two motors (32) are fixedly connected to the top of the two rotating columns (25) respectively.

9. The catalyst recovery device for antioxidant 1520 production according to claim 1, characterized in that: The distillation column (4) has multiple trays (401) that are uniformly distributed and fixedly arranged in the longitudinal direction inside.

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