Hydrogenation reaction device for producing methylhexahydrophthalic anhydride

Abstract

The utility model relates to a hydrogenation reaction device for production of methylhexahydrophthalic anhydride, which comprises a kettle body and a kettle cover, a plurality of hydrogenation reactors are arranged in the kettle body from top to bottom at intervals, the top of the kettle cover is provided with a feed port, a hydrogenation port and an exhaust port, and the bottom of the kettle body is provided with a discharge port; the hydrogenation reactor comprises a catalyst layer and a hydrogenation device arranged above the catalyst layer, the catalyst layer comprises a filter plate and a catalyst arranged above the filter plate, the hydrogenation device comprises a horizontally arranged cylindrical ventilation chamber, a liquid passing hole is formed in the middle of the ventilation chamber, a plurality of ventilation holes are uniformly formed in the upper surface of the ventilation chamber, and the liquid passing hole is communicated with the liquid passing hole. The ventilation chamber is connected with a hydrogenation port through a hydrogenation pipe; the reaction kettle further comprises a rotating shaft arranged in the middle of the kettle body, the upper end of the rotating shaft is connected with a driving mechanism mounted on the kettle cover, and stirring blades are mounted on the rotating shaft above the ventilation chamber. According to the hydrogenation reaction device, the reaction efficiency and the yield are improved by adjusting the hydrogenation mode and the catalyst layout, so that the power consumption is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of methylhexahydrophthalic anhydride production equipment, specifically to a hydrogenation reaction device for the production of methylhexahydrophthalic anhydride. Background Technology

[0002] Methylhexahydrophthalic anhydride, also known as methylhexahydrophthalic anhydride, abbreviated as MHHPA, has the molecular formula C9H12O3, a molecular weight of 168.19, and CAS number 25550-51-0. It is a colorless, transparent liquid, soluble in benzene, acetone, etc., hygroscopic, and has a specific gravity of 1.162. It is mainly used as a curing agent for epoxy resins. MHHPA is a heat-curing anhydride curing agent, primarily used in the electrical and electronic fields. It has advantages such as a low melting point, low viscosity of complexes with alicyclic epoxy resins, long pot life, high heat resistance of cured products, and good high-temperature electrical properties. It can be used for impregnating coils in electrical equipment, casting electrical components, and sealing semiconductors, such as outdoor insulators, capacitors, light-emitting diodes, and digital tubes. In current industrial production, methylhexahydrophthalic anhydride is mainly prepared using the catalytic hydrogenation process of methyltetrahydrophthalic anhydride. The catalyst used is generally Raney nickel, and the equipment used is a stirred reactor. Improving the speed and efficiency of hydrogenation reactions, while reducing power consumption and increasing yield, is crucial for enterprise production. The effectiveness of hydrogen supply in hydrogenation reactions significantly impacts the reaction process; therefore, it is necessary to provide a hydrogenation reactor for the production of methylhexahydrophthalic anhydride that can improve reaction efficiency and yield while reducing power consumption. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a hydrogenation reaction device for the production of methylhexahydrophthalic anhydride, which improves reaction efficiency and yield by adjusting the hydrogenation method and catalyst layout, thereby reducing power consumption.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0005] A hydrogenation reactor for the production of methylhexahydrophthalic anhydride includes a vessel body and a vessel cover. Multiple hydrogenation reactors are arranged at intervals from top to bottom inside the vessel body. The top of the vessel cover is provided with a feed port, a hydrogenation port, and an exhaust port. The bottom of the vessel body is provided with a discharge port.

[0006] The hydrogenation reactor includes a catalyst layer and a hydrogenator disposed above the catalyst layer. The catalyst layer includes a filter plate and a catalyst disposed above the filter plate. The hydrogenator includes a horizontally arranged cylindrical ventilation chamber with a liquid passage hole in the middle. Multiple ventilation holes are uniformly opened on the upper surface of the ventilation chamber. The ventilation chamber is connected to the hydrogen inlet through a hydrogenation pipe.

[0007] It also includes a rotating shaft located in the middle of the vessel body, the upper end of which is connected to a drive mechanism installed on the vessel lid, and a stirring blade is installed on the rotating shaft above the ventilation chamber.

[0008] In one embodiment of this utility model, multiple hydrogenation reactors are connected together by vertically arranged connecting rods. Each connecting rod has a support block at the bottom of the filter plate and the ventilation chamber in each hydrogenation reactor. An annular support plate is provided on the lower inner wall of the vessel body to support the lowest hydrogenation reactor. A hanging ring is provided at the top of the connecting rod, and multiple hydrogenation reactors are placed in the vessel body by a lifting device. There are no fewer than three connecting rods evenly arranged around the circumference.

[0009] In one embodiment of this utility model, the filter plate and the ventilation chamber are provided with through holes corresponding to the hydrogenation pipe, and the hydrogenation pipe is connected to the bottom of the ventilation chamber through a branch pipe.

[0010] In one embodiment of this utility model, the lower part of the vessel body is conical, and a limiting cylinder is installed on the lower part of the vessel body through a support frame. The lower end of the rotating shaft is rotated and limited by the limiting cylinder.

[0011] In one embodiment of this utility model, a filter assembly is provided on the support frame.

[0012] In one embodiment of this utility model, a fixing block is detachably mounted on the rotating shaft, an mounting sleeve is provided above the fixing block, and a slot adapted to the shape of the fixing block is provided at the bottom of the mounting sleeve. The fixing block drives the mounting sleeve to rotate through the slot, and multiple stirring blades are evenly mounted on the mounting sleeve circumferentially.

[0013] In one embodiment of this utility model, the driving mechanism is a drive motor; the side wall of the vessel is evenly provided with a plurality of three support seats and lifting lugs, and the lower part of the support seat is fixedly provided with a support leg.

[0014] In one embodiment of this utility model, a control valve is provided on the discharge port; the filter plate is a cylindrical shape with an open top.

[0015] The beneficial effects of adopting the above technical solution are as follows:

[0016] The hydrogenation reactor for the production of methylhexahydrophthalic anhydride provided by this invention has three sets of hydrogenation reactors arranged at intervals from top to bottom within the reactor body, enabling the hydrogenation reaction to proceed fully and continuously, thus greatly improving the efficiency of the hydrogenation reaction. Furthermore, the hydrogenation reactor consists of a catalyst layer and a hydrogenator positioned above it. Stirring blades are installed on the upper surface of the hydrogenator. After hydrogen gas enters the ventilation chamber through the hydrogen inlet, it enters the upper part of the ventilation chamber through the ventilation holes on the upper surface of the ventilation chamber. Under the action of the stirring blades, it is thoroughly mixed with the reaction liquid falling onto the upper surface of the ventilation chamber, and then falls through the liquid passage holes onto the catalyst layer below for catalytic reaction. By improving the hydrogenation method, the reaction efficiency and yield can be effectively improved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a top view of the structure of this utility model.

[0019] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at point AA.

[0020] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

[0021] The components are as follows: 1. Reactor body, 2. Reactor cover, 3. Feed port, 4. Hydrogen port, 401. Hydrogen pipe, 402. Branch pipe, 5. Discharge port, 6. Exhaust port, 7. Rotary shaft, 8. Drive motor, 9. Filter plate, 10. Filter hole, 11. Catalyst, 12. Vent chamber, 1201. Liquid passage hole, 13. Vent hole, 14. Stirring blade, 15. Mounting sleeve, 16. Slot, 17. Fixing block, 18. Support frame, 19. Limiting cylinder, 20. Filter assembly, 21. Connecting rod, 22. Support block, 23. Support plate, 24. Hanging ring, 25. Support base, 26. Support leg, 27. Lifting lug. Detailed Implementation

[0022] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be clearly and completely described below in conjunction with specific embodiments.

[0023] like Figures 1-4 The apparatus shown is a hydrogenation reactor for the production of methylhexahydrophthalic anhydride, comprising a vessel body 1 and a vessel cover 2. Multiple hydrogenation reactors are arranged at intervals from top to bottom inside the vessel body 1. The top of the vessel cover 2 is provided with a feed port 3, a hydrogenation port 4 and an exhaust port 6, and the bottom of the vessel body 1 is provided with a discharge port 5.

[0024] The hydrogenation reactor includes a catalyst layer and a hydrogenator disposed above the catalyst layer. The catalyst layer includes a filter plate 9 and a catalyst 11 disposed above the filter plate 9. The filter plate 9 is provided with filter holes 10, which allow the reaction liquid to flow down while blocking the catalyst 11 above. The hydrogenator includes a horizontally arranged cylindrical ventilation chamber 12. The ventilation chamber 12 is provided with a liquid passage hole 1201 in the middle. Multiple ventilation holes 13 are uniformly opened on the upper surface of the ventilation chamber 12. The ventilation chamber 12 is connected to the hydrogen filling port 4 through a hydrogen filling pipe 401. The ventilation holes 13 are reasonably sized so that when hydrogen gas enters the ventilation chamber 12 from the ventilation holes 13 under pressure, the reaction liquid cannot enter the ventilation chamber 12 through the ventilation holes 13.

[0025] The hydrogenation reactor also includes a rotating shaft 7 located in the middle of the vessel body 1. The upper end of the rotating shaft 7 is connected to a drive mechanism mounted on the vessel cover 2. A stirring blade 14 is mounted on the rotating shaft 7 above the ventilation chamber 12. The stirring blade 14 is positioned close to the upper surface of the ventilation chamber 12. A through hole corresponding to the rotating shaft 7 is provided in the middle of the catalyst layer.

[0026] The hydrogenation reactor is equipped with three sets of hydrogenation reactors arranged at intervals from top to bottom within the vessel body 1, allowing the hydrogenation reaction to proceed fully and continuously, thus greatly improving the efficiency of the hydrogenation reaction. Furthermore, the hydrogenation reactor consists of a catalyst layer and a hydrogenator positioned above it. A stirring blade 14 is installed on the upper surface of the hydrogenator. Hydrogen gas enters the ventilation chamber 12 through the hydrogen inlet 4, and then enters the area above the ventilation chamber 12 through the ventilation holes 13 on its upper surface. Under the action of the stirring blades 14, it is thoroughly mixed with the reaction liquid falling onto the upper surface of the ventilation chamber 12, and then falls through the liquid passage 1201 onto the catalyst layer below for catalytic reaction. By improving the hydrogenation method, the reaction efficiency and yield can be effectively increased.

[0027] like Figure 3 As shown, in this embodiment, multiple hydrogenation reactors are connected together by vertically arranged connecting rods 21. Each hydrogenation reactor has a support block 22 at the bottom of the filter plate 9 and the ventilation chamber 12 on the connecting rod 21. An annular support plate 23 is provided on the lower inner wall of the vessel body 1 to support the lowest hydrogenation reactor. A hanging ring 24 is provided on the top of the connecting rod 21 so that after the vessel cover 2 is opened, multiple hydrogenation reactors can be placed together in the vessel body 1 by the lifting device and the hanging ring 24. There are no fewer than three connecting rods 21 evenly arranged around the circumference.

[0028] The filter plate 9 and the ventilation chamber 12 are provided with through holes corresponding to the hydrogenation pipe 401. The hydrogenation pipe 401 is connected to the bottom of the ventilation chamber 12 through the branch pipe 402.

[0029] The lower part of the vessel body 1 is conical, and a limiting cylinder 19 is installed on the lower part of the vessel body 1 through a support frame 18. The lower end of the rotating shaft 7 is rotated and limited by the limiting cylinder 19.

[0030] The support frame 18 is equipped with a filter assembly 20, which is used to filter the catalyst carried in methylhexahydrophthalic anhydride, reduce waste, and improve product purity.

[0031] like Figure 4 As shown, a fixing block 17 is detachably mounted on the rotating shaft 7. A mounting sleeve 15 is provided above the fixing block 17. The bottom of the mounting sleeve 15 is provided with a slot 16 that matches the shape of the fixing block 17. The fixing block 17 drives the mounting sleeve 15 to rotate through the slot 16. Multiple stirring blades 14 are evenly mounted on the mounting sleeve 15 in a circumferential manner. The fixing block 17 is triangular, square, or irregularly shaped.

[0032] In addition, a control valve is provided on the discharge port 5. As a further optimization, the filter plate 9 is a cylindrical shape with an opening at the top.

[0033] The driving mechanism is a drive motor 8; the side wall of the vessel body 1 is evenly provided with a plurality of three support seats 25 and lifting lugs 27, and the lower part of the support seat 25 is fixedly provided with a support leg 26.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrogenation reactor for the production of methylhexahydrophthalic anhydride, characterized in that: It includes a vessel body (1) and a vessel cover (2). Multiple hydrogenation reactors are arranged at intervals from top to bottom inside the vessel body (1). The top of the vessel cover (2) is provided with a feed port (3), a hydrogenation port (4) and an exhaust port (6). The bottom of the vessel body (1) is provided with a discharge port (5). The hydrogenation reactor includes a catalyst layer and a hydrogenator disposed above the catalyst layer. The catalyst layer includes a filter plate (9) and a catalyst (11) disposed above the filter plate (9). The hydrogenator includes a horizontally arranged cylindrical ventilation chamber (12). A liquid passage hole (1201) is provided in the middle of the ventilation chamber (12). A plurality of ventilation holes (13) are uniformly opened on the upper surface of the ventilation chamber (12). The ventilation chamber (12) is connected to the hydrogen filling port (4) through a hydrogen filling pipe (401). It also includes a rotating shaft (7) located in the middle of the vessel body (1), the upper end of which is connected to a drive mechanism installed on the vessel cover (2), and a stirring blade (14) is installed on the rotating shaft (7) above the ventilation chamber (12).

2. The hydrogenation reactor for the production of methylhexahydrophthalic anhydride according to claim 1, characterized in that: Multiple hydrogenation reactors are connected together by vertically arranged connecting rods (21). Each connecting rod (21) has a support block (22) at the bottom of the filter plate (9) and the ventilation chamber (12) in each hydrogenation reactor. An annular support plate (23) is provided on the lower inner wall of the vessel body (1) to support the lowest hydrogenation reactor. A hanging ring (24) is provided on the top of the connecting rod (21) so that multiple hydrogenation reactors can be placed in the vessel body (1) by a lifting device. There are no fewer than three connecting rods (21) evenly arranged around the circumference.

3. The hydrogenation reactor for the production of methylhexahydrophthalic anhydride according to claim 2, characterized in that: The filter plate (9) and the ventilation chamber (12) are provided with through holes corresponding to the hydrogenation pipe (401), and the hydrogenation pipe (401) is connected to the bottom of the ventilation chamber (12) through a branch pipe (402).

4. The hydrogenation reactor for the production of methylhexahydrophthalic anhydride according to claim 1, characterized in that: The lower part of the vessel body (1) is conical, and the lower part of the vessel body (1) is equipped with a limiting cylinder (19) through a support frame (18). The lower end of the rotating shaft (7) is rotated and limited by the limiting cylinder (19).

5. A hydrogenation reactor for the production of methylhexahydrophthalic anhydride according to claim 4, characterized in that: A filter assembly (20) is provided on the support frame (18).

6. The hydrogenation reactor for the production of methylhexahydrophthalic anhydride according to claim 1, characterized in that: A fixing block (17) is detachably mounted on the rotating shaft (7). An installation sleeve (15) is provided above the fixing block (17). A slot (16) adapted to the shape of the fixing block (17) is provided at the bottom of the installation sleeve (15). The fixing block (17) drives the installation sleeve (15) to rotate through the slot (16). Multiple stirring blades (14) are evenly installed on the installation sleeve (15) in a circumferential direction.

7. A hydrogenation reactor for the production of methylhexahydrophthalic anhydride according to claim 1, characterized in that: The driving mechanism is a drive motor (8); the side wall of the vessel body (1) is evenly provided with a number of three support seats (25) and lifting lugs (27) in the circumferential direction, and the lower part of the support seat (25) is fixed with a support leg (26).

8. A hydrogenation reactor for the production of methylhexahydrophthalic anhydride according to claim 1, characterized in that: The discharge port (5) is equipped with a control valve; the filter plate (9) is a cylindrical shape with an open top.

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