Large reaction device for producing furfuryl alcohol
By designing a reaction kettle with a heat exchange jacket and a coaxial bidirectional stirring stirrer in the furfuryl alcohol reactor, the problems of poor production capacity, large area, and difficult maintenance of the existing reactor are solved, and timely reaction heat is realized. The removal and uniform mixing of materials improves the reaction efficiency and the service life of the equipment.
Patent Information
- Application Number
- CN202420273662.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-04
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-02-04
AI Technical Summary
Due to the small size of the existing furfuryl alcohol reactor, it has poor production capacity and requires multiple equipment to be connected in parallel to improve efficiency. However, this increases investment cost, floor area and maintenance difficulty, and is prone to coking to affect operation.
A large-scale reaction device is designed, which uses a reaction kettle with a heat exchange jacket and a coaxial bidirectional stirring stirrer. The heat of reaction is removed in time through the heat exchange jacket, and the stirrer achieves uniform mixing and full stirring of the materials, which avoids Coking phenomenon caused by excessive local temperature.
The timely removal of reaction heat and the uniform mixing of the material, avoiding the phenomenon of scorching, improving the response efficiency, reducing the area occupying the area and maintenance costs, and extending the maintenance cycle of the equipment.
Smart Images
Figure CN222384805U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of furfuryl alcohol production, in particular to a large-scale reaction device for producing furfuryl alcohol. Background Art
[0002] At present, the preparation methods of furfuryl alcohol mainly include gas phase hydrogenation method and liquid phase hydrogenation method, and the method for large-scale production of furfural in the chemical industry is mainly liquid phase hydrogenation method, which is to reduce and hydrogenate furfural and excess hydrogen under the action of solid catalyst under high temperature and high pressure conditions to generate crude furfuryl alcohol; the crude furfuryl alcohol is filtered and distilled to obtain the finished furfuryl alcohol; the hydrogenation reaction is violent in the above-mentioned liquid phase hydrogenation production process, and a large amount of heat is generated at the same time, causing serious local coking phenomenon in the reactor, and subsequent processes will cause blockage and other problems, which seriously affect the operation cycle of the reactor and the safety and stability of production; for the above reasons, the existing furfuryl alcohol reactor is generally small in size to achieve timely removal of reaction heat, thereby reducing the problem of coking; further, this type of monomer furfuryl alcohol reactor has poor production capacity due to its small size, and most companies connect multiple reactors in parallel during production to achieve the purpose of improving production efficiency; the above method causes the company's investment cost to be large, the setting of multiple reactors causes a large footprint, and since coking phenomenon is inevitable, and there are many equipment, it is difficult to maintain. Utility Model Content
[0003] The utility model aims to provide a large-scale reaction device for producing furfuryl alcohol to overcome the defects in the prior art.
[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0005] A large-scale reaction device for producing furfuryl alcohol comprises a feed unit for producing furfuryl alcohol, wherein the feed unit for producing furfuryl alcohol is connected to a crude furfuryl alcohol discharge unit via a reactor unit for producing furfuryl alcohol, wherein the reactor unit comprises at least a reactor body, wherein a heat exchange jacket for removing reaction heat is arranged on the outside of the reactor body, a feed port is arranged on the top of the reactor body, a discharge port is arranged on the bottom of the reactor body, and a material reaction stirring member capable of realizing coaxial bidirectional stirring is arranged inside the reactor body.
[0006] The beneficial effects of the utility model are as follows: by providing a reactor body with a heat exchange jacket for removing reaction heat, the reaction heat can be removed in time, and by providing a coaxial bidirectional stirring material reaction stirring element, the material can be fully stirred. The above-mentioned sufficient stirring can make the material evenly mixed to achieve the purpose of temperature uniformity, avoid local excessive temperature and coking, thereby achieving the characteristics of improving reaction efficiency, reducing floor space and reducing maintenance costs.
[0007] Preferably, the material reaction stirring element includes a stirring motor arranged in the middle position of the top of the reactor body, the main shaft of the stirring motor is connected to the stirring inner shaft extending to the inside of the reactor body through a coupling, and the upper part of the stirring inner shaft is provided with an upper stirring blade; the lower part of the stirring inner shaft is connected to the stirring outer shaft through a bearing; the outside of the stirring outer shaft is provided with a lower stirring blade; the stirring inner shaft and the stirring outer shaft are both made of metal.
[0008] Preferably, the material reaction stirring element includes a stirring motor arranged in the middle position of the top of the reactor body, the main shaft of the stirring motor is connected to the stirring inner shaft extending to the interior of the reactor body through a coupling, and the upper part of the stirring inner shaft is provided with an upper stirring blade; the lower part of the stirring inner shaft is provided with a sun gear, the sun gear is meshed with a gear ring arranged on the inner wall of the stirring outer shaft through a planetary gear, and the outside of the stirring outer shaft is provided with a lower stirring blade.
[0009] Preferably, the reactor unit further comprises a desalted water pipeline connected to the lower part of the heat exchange jacket, and the upper part of the heat exchange jacket is connected to the steam network through a steam drum.
[0010] Preferably, the feed unit for producing furfuryl alcohol includes a furfural catalyst pipeline and a hydrogen pipeline; the furfural catalyst pipeline and the hydrogen pipeline are respectively connected to the inlet of the pipeline mixer, the outlet of the pipeline mixer is connected to the first heat exchange channel of the raw material preheater, and the outlet of the first heat exchange channel of the raw material preheater is connected to the feed port.
[0011] Preferably, the discharge port is connected to the gas-liquid separation tank through the second heat exchange channel of the raw material preheater, the gas phase outlet of the gas-liquid separation tank is connected to the hydrogen recovery storage tank, the liquid phase outlet of the gas-liquid separation tank is connected to the filter press, and the liquid phase outlet of the filter press is connected to the crude furfuryl alcohol storage tank.
[0012] A large-scale reaction device for producing furfuryl alcohol made according to the above scheme can achieve sufficient stirring of the material by setting a coaxial bidirectional stirring material reaction stirring piece, thereby achieving uniform temperature of the reaction material. On this basis, a heat exchange jacket is set to take away the heat of the reaction material in time to achieve the purpose of improving production efficiency. The coaxial bidirectional stirring material reaction stirring piece of the utility model can adopt the following two structural forms. The first is to generate magnetic force by rotating the stirring inner shaft to realize the rotation of the stirring outer shaft, so that the upper stirring blade and the lower stirring blade can stir the material at the same time; the second is to drive the stirring outer shaft to rotate while the stirring inner shaft rotates through the meshing of the sun gear, the planetary gear and the ring gear; it has the characteristics of driving the reactor body with opposite stirring directions up and down by the same stirring motor, thereby achieving uniform mixing of the materials; the above structural form can avoid the local temperature of the material from being too high to produce coking, thereby achieving the characteristics of improving processing capacity and production efficiency, and thus compared with the prior art, it has the advantages of reducing the purchase cost of the enterprise, reducing the equipment footprint, and reducing the maintenance difficulty of maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the utility model.
[0014] Figure 2 It is a structural schematic diagram of the reactor body of the utility model.
[0015] Figure 3 This is a schematic diagram of the positional relationship between the inner stirring shaft and the outer stirring shaft of the utility model.
[0016] Figure 4 This is another schematic diagram of the positional relationship between the inner stirring shaft and the outer stirring shaft of the utility model.
[0017] In the figure: 1. Reactor body; 2. Heat exchange jacket; 3. Feed inlet; 4. Discharge outlet; 5. Stirring motor; 6. Coupling; 7. Stirring inner shaft; 8. Upper stirring blades; 9. Bearing; 10. Stirring outer shaft; 11. Lower stirring blades; 12. Sun gear; 13. Planetary gear; 14. Ring gear; 15. Desalted water pipeline; 16. Steam drum; 17. Steam pipeline network; 18. Furfural catalyst pipeline; 19. Hydrogen pipeline; 20. Pipeline mixer; 21. Raw material preheater; 22. Gas-liquid separation tank; 23. Hydrogen recovery storage tank; 24. Filter press; 25. Crude furfuryl alcohol storage tank. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0019] Reference Figure 1-2As shown, a large-scale reaction device for producing furfuryl alcohol comprises a feed unit for producing furfuryl alcohol, the feed unit for producing furfuryl alcohol is connected to a crude furfuryl alcohol discharging unit through a reactor unit for producing furfuryl alcohol, the reactor unit at least comprises a reactor body 1, a heat exchange jacket 2 for removing reaction heat is arranged outside the reactor body 1, a feed port 3 is arranged at the top of the reactor body 1, a discharge port 4 is arranged at the bottom of the reactor body 1, and a material reaction stirring member capable of realizing coaxial bidirectional stirring is arranged inside the reactor body 1. The feed unit for producing furfuryl alcohol described in the utility model is used to supply materials to the reactor body 1 so that the materials react inside it, and the reaction products enter the crude furfuryl alcohol discharging unit for subsequent treatment. During the reaction of the materials in the reactor body 1, the coaxial bidirectional stirring material reaction stirring member stirs the materials, thereby realizing the uniform temperature of the materials. On this basis, the heat exchange jacket 2 for removing reaction heat is cooperated to remove the heat, so as to avoid local heating of the materials, so as to avoid coking, improve the reaction rate of the materials, and realize the purpose of reducing enterprise investment, reducing equipment footprint and reducing maintenance difficulty.
[0020] Further, refer to Figure 2-3 As shown, the material reaction stirring member includes a stirring motor 5 arranged at the middle position of the top of the reactor body 1, the main shaft of the stirring motor 5 is connected to the stirring inner shaft 7 extending to the inside of the reactor body 1 through a coupling 6, and the upper part of the stirring inner shaft 7 is provided with an upper stirring blade 8; the lower part of the stirring inner shaft 7 is connected to the stirring outer shaft 10 through a bearing 9; the outer part of the stirring outer shaft 10 is provided with a lower stirring blade 11; the stirring inner shaft 7 and the stirring outer shaft 10 are both made of metal. By making the stirring inner shaft 7 and the stirring outer shaft 10 made of metal, in the process of the stirring motor 5 driving the stirring inner shaft 7 to rotate through the coupling 6, it generates a magnetic field to drive the stirring outer shaft 10 to rotate in the opposite direction; the above rotation realizes the reverse rotation of the upper stirring blade 8 and the lower stirring blade 11, thereby improving the mixing efficiency of the material and avoiding the phenomenon of uneven temperature inside the material.
[0021] Further, refer to Figure 2 , 4As shown, the material reaction stirring member includes a stirring motor 5 arranged at the middle position of the top of the reactor body 1, the main shaft of the stirring motor 5 is connected to the stirring inner shaft 7 extending to the inside of the reactor body 1 through a coupling 6, and the upper part of the stirring inner shaft 7 is provided with an upper stirring blade 8; the lower part of the stirring inner shaft 7 is provided with a sun gear 12, and the sun gear 12 is meshed with a gear ring 14 arranged on the inner wall of the stirring outer shaft 10 through a planetary gear 13, and the outer part of the stirring outer shaft 10 is provided with a lower stirring blade 11. The utility model also provides another coaxial bidirectional stirring material reaction stirring member, the stirring member is driven by the stirring motor 5 to rotate the stirring inner shaft 7, and the stirring outer shaft 10 with a gear ring 14 on the inner wall is driven to rotate during the rotation of the stirring inner shaft 7 through the sun gear 12 and the planetary gear 13, and the above rotation realizes the reverse rotation of the upper stirring blade 8 and the lower stirring blade 11, thereby improving the mixing efficiency of the material and avoiding the phenomenon of uneven temperature inside the material.
[0022] Further, refer to Figure 1 As shown, the reactor unit further includes a desalted water pipeline 15 connected to the lower part of the heat exchange jacket 2, and the upper part of the heat exchange jacket 2 is connected to the steam network 17 through a steam drum 16. The heat exchange medium in the heat exchange jacket 2 of the utility model can be a conventional medium, such as water, thermal oil, etc., but preferably desalted water, which can achieve the purpose of by-product steam by using desalted water as the heat exchange medium.
[0023] Further, refer to Figure 1 , 2 As shown, the feeding unit for producing furfuryl alcohol includes a furfural catalyst pipeline 18 and a hydrogen pipeline 19; the furfural catalyst pipeline 18 and the hydrogen pipeline 19 are respectively connected to the inlet of the pipeline mixer 20, the outlet of the pipeline mixer 20 is connected to the first heat exchange channel of the raw material preheater 21, and the outlet of the first heat exchange channel of the raw material preheater 21 is connected to the feed port 3. Due to the high production efficiency of the utility model, the pipeline mixer 20 can be used for feeding; at the same time, in order to meet the requirements of the material reaction temperature and the purpose of the rapid reaction of the reactor body 1, the utility model is also provided with a raw material preheater 21 to realize the preheating of the raw material.
[0024] Further, refer to Figure 1 , 2 As shown, the discharge port 4 is connected to the gas-liquid separation tank 22 through the second heat exchange channel of the raw material preheater 21, the gas phase outlet of the gas-liquid separation tank 22 is connected to the hydrogen recovery storage tank 23, the liquid phase outlet of the gas-liquid separation tank 22 is connected to the filter press 24, and the liquid phase outlet of the filter press 24 is connected to the crude furfuryl alcohol storage tank 25. The preheating of the raw materials in the utility model is preferably carried out by using the waste heat of the reaction materials in the reactor body 1 to achieve the characteristics of saving steam consumption and avoiding heat loss.
[0025] The working principle of the utility model is as follows: the reactor body 1 is preferably preheated before using the utility model. After the preheating is completed, the furfural with the catalyst added in the furfural catalyst pipeline 18 and the hydrogen in the hydrogen pipeline 19 enter the pipeline mixer 20 for full mixing; after mixing, the raw materials enter the first heat exchange channel of the raw material preheater 21 for heat exchange, and the temperature of the raw materials after heat exchange is 60°C to 110°C; the raw materials after heat exchange enter the reactor body 1 to undergo hydrogenation reaction under the action of high temperature and catalyst; the temperature in the reactor body 1 is 190°C to 230°C, and the pressure is 5.95MPa to 6.7MPa; at the same time, the stirring motor 5 drives the stirring inner shaft 7 to rotate, and the stirring outer shaft 10 rotates in the direction. During the above working process, the materials in the reactor body 1 are subjected to disordered movement, which not only realizes the uniform distribution of temperature, but also promotes the mixing of reactants. The phenomenon of coking in the reactor is also avoided; further, the desalted water pipeline 15 supplies desalted water to the heat exchange jacket 2 for heat exchange, produces saturated steam of 0.5MPa to 1.3MPa, and enters the steam pipe network 17; the material after the reaction in the reactor body 1 is provided with a discharge port 4 at the bottom of the reactor body 1 to enter the second heat exchange channel of the raw material preheater 21 to exchange heat with the raw material from the first heat exchange channel of the raw material preheater 21; the material passing through the second heat exchange channel of the raw material preheater 21 enters the gas-liquid separation tank 22 for gas-liquid separation, and the gas phase of the gas-liquid separation is hydrogen, and the hydrogen enters the hydrogen recovery storage tank 23 for reuse; the gas phase and liquid phase of the gas-liquid separation enter the filter press 24 for filter pressing, the solid obtained by filter pressing is the waste catalyst, and the liquid phase obtained by filter pressing is crude furfuryl alcohol, and the crude furfuryl alcohol enters the crude furfuryl alcohol storage tank 25 for temporary storage and then is sent to the subsequent refining process. By using the utility model, the purpose of large-scale production of furfuryl alcohol can be achieved, the production capacity of a single set reaches 35,000 tons / year, and the furfuryl alcohol yield reaches 98.3%. It has the advantages of small equipment size, simple structure, reasonable design, high conversion rate, etc. At the same time, the maintenance period of the reactor is extended from the original 25d to 80d, which greatly reduces the labor intensity of manual operation and greatly improves the safety performance.
[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A large-scale reaction device for producing furfuryl alcohol, characterized in that: The method comprises a feeding unit for producing furfuryl alcohol, wherein the feeding unit for producing furfuryl alcohol is connected to a crude furfuryl alcohol discharging unit through a reactor unit for producing furfuryl alcohol. The reactor unit comprises at least a reactor body (1), the outside of the reactor body (1) is provided with a heat exchange jacket (2) for removing reaction heat, the top of the reactor body (1) is provided with a feed inlet (3), the bottom of the reactor body (1) is provided with a discharge outlet (4), and the inside of the reactor body (1) is provided with a material reaction stirring element capable of realizing coaxial bidirectional stirring.
2. A large-scale reaction device for producing furfuryl alcohol according to claim 1, characterized in that: The material reaction stirring member comprises a stirring motor (5) arranged at the middle position of the top of the reactor body (1); the main shaft of the stirring motor (5) is connected to an inner stirring shaft (7) extending into the interior of the reactor body (1) through a coupling (6); an upper stirring blade (8) is arranged on the upper part of the inner stirring shaft (7); the lower part of the inner stirring shaft (7) is connected to an outer stirring shaft (10) through a bearing (9); and a lower stirring blade (11) is sleeved on the outer part of the outer stirring shaft (10); The inner stirring shaft (7) and the outer stirring shaft (10) are both made of metal.
3. A large-scale reaction device for producing furfuryl alcohol according to claim 1, characterized in that: The material reaction stirring member comprises a stirring motor (5) arranged at the middle position of the top of the reactor body (1); the main shaft of the stirring motor (5) is connected to the stirring inner shaft (7) extending into the interior of the reactor body (1) through a coupling (6); the upper part of the stirring inner shaft (7) is provided with an upper stirring blade (8); the lower part of the stirring inner shaft (7) is provided with a sun gear (12); the sun gear (12) is meshed with a gear ring (14) arranged on the inner wall of the stirring outer shaft (10) through a planetary gear (13); the outer part of the stirring outer shaft (10) is provided with a lower stirring blade (11).
4. A large-scale reaction device for producing furfuryl alcohol according to claim 1, characterized in that: The reactor unit further comprises a desalted water pipeline (15) connected to the lower part of the heat exchange jacket (2), and the upper part of the heat exchange jacket (2) is connected to the steam network (17) via a steam drum (16).
5. A large-scale reaction device for producing furfuryl alcohol according to claim 1, characterized in that: The feed unit for producing furfuryl alcohol comprises a furfural catalyst pipeline (18) and a hydrogen pipeline (19); the furfural catalyst pipeline (18) and the hydrogen pipeline (19) are respectively connected to the inlet of a pipeline mixer (20); the outlet of the pipeline mixer (20) is connected to the first heat exchange channel of a raw material preheater (21); and the outlet of the first heat exchange channel of the raw material preheater (21) is connected to the feed port (3).
6. A large-scale reaction device for producing furfuryl alcohol according to claim 5, characterized in that: The discharge port (4) is connected to the gas-liquid separation tank (22) through the second heat exchange channel of the raw material preheater (21); the gas phase outlet of the gas-liquid separation tank (22) is connected to the hydrogen recovery storage tank (23); the liquid phase outlet of the gas-liquid separation tank (22) is connected to the filter press (24); and the liquid phase outlet of the filter press (24) is connected to the crude furfuryl alcohol storage tank (25).