Normal-pressure liquid-phase hydrogenation reaction system
By setting up the inlet and outlet of the circulating hydrogen at the bottom of the jacketed reactor of the liquid phase hydrogenation reaction system, the hydrogen and the reaction liquid are fully in contact with each other under normal pressure, solving the long production cycle and safety risks caused by high-pressure hydrogen in the prior art. High problems improve reaction efficiency and safety.
Patent Information
- Application Number
- CN202420267189.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-03
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-02-03
AI Technical Summary
The existing liquid phase hydrogenation reaction devices require high-pressure hydrogen in the production of furfuryl alcohol, resulting in a long production cycle and high safety risks.
Design a normal pressure liquid phase hydrogenation reaction system, by setting the inlet and outlet of circulating hydrogen at the bottom of the jacketed reactor, the hydrogen gas is fully contacted with the reaction liquid at normal pressure, and the hydrogen circulation pump and buffer tank are used to increase the hydrogen gas. Utilization.
The full contact between hydrogen and the reaction liquid is achieved under normal pressure, improve reaction efficiency, shorten production cycles, and reduce safety risks brought by high pressure.
Smart Images
Figure CN222427969U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an atmospheric pressure liquid phase hydrogenation reaction system. Background Technology
[0002] Liquid-phase hydrogenation reactors are typically used to prepare furfuryl alcohol or dimethylfuran. Taking the preparation of furfuryl alcohol as an example, furfural and a catalyst are continuously stirred and mixed in a reactor. High-pressure hydrogen gas is introduced into the top of the reactor. The catalytic hydrogenation reaction of furfural occurs only at the top liquid surface where furfural and hydrogen come into contact. To increase the contact between hydrogen and furfural and the solubility of hydrogen in furfural, a high-pressure hydrogen environment is required. The above method results in a long production cycle for furfuryl alcohol and poses a high safety risk in the production process. Utility Model Content
[0003] The purpose of this invention is to provide an atmospheric pressure liquid-phase hydrogenation reaction system to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution:
[0005] An atmospheric pressure liquid-phase hydrogenation reaction system includes a jacketed reactor. The jacketed reactor has a feed inlet on one side of its lower part and a discharge outlet on one side of its upper part. The top of the jacketed reactor has a circulating hydrogen outlet, which is connected to a circulating hydrogen inlet located at the bottom of the jacketed reactor via a circulation section.
[0006] The beneficial effects of this utility model are as follows: By setting a circulating hydrogen inlet at the bottom of the jacketed reactor, hydrogen can enter from the bottom of the jacketed reactor, thereby achieving full contact with the reaction liquid under normal pressure. Furthermore, the hydrogen in the circulating hydrogen outlet is connected to the circulating hydrogen inlet through the circulation section, so as to achieve full contact between hydrogen and the reaction liquid under the premise of saving hydrogen and normal pressure, thereby improving reaction efficiency, shortening the production cycle and reducing the safety risks caused by high pressure during the production process.
[0007] Preferably, the circulation section includes a hydrogen circulation pipeline disposed between the circulating hydrogen outlet and the circulating hydrogen inlet, and the hydrogen circulation pipeline is equipped with a hydrogen buffer tank and a hydrogen circulation pump.
[0008] Preferably, the outlet of the jacketed reactor is connected to the inlet of the furfuryl alcohol buffer tank, and the outlet of the furfuryl alcohol buffer tank is connected to the furfuryl alcohol storage tank through a pipeline; the top gas phase outlet of the furfuryl alcohol buffer tank is connected to the hydrogen circulation pipeline.
[0009] Preferably, the hydrogen buffer tank is provided with a hydrogen supply pipe connected to the hydrogen pipeline network, and the hydrogen supply pipe is provided with a hydrogen supply valve.
[0010] Preferably, the jacketed reactor corresponding to the circulating hydrogen inlet is equipped with a stirring unit powered by hydrogen; the stirring unit includes an inlet connected to the circulating hydrogen inlet, and a stirring element located at the bottom of the jacketed reactor and connected to the inlet.
[0011] Preferably, the stirring component includes a stirring spray arm, the lower middle part of which is fixedly connected to the top of the sealing connection seat, and several spray holes are respectively opened on both sides of the stirring spray arm, the spray holes being oblique openings with an inclination angle of 30 to 60°.
[0012] Preferably, the air intake component includes a fixed base, which is composed of a left fixed base and a right fixed base. The lower part of the left fixed base and the right fixed base are respectively provided with an integral fixed ring. The fixed ring is provided with bolt holes that are adapted to the bottom of the jacketed reactor. The middle part of the inner side of the left fixed base and the right fixed base are respectively provided with a sliding groove. The lower part of the inner side of the left fixed base and the right fixed base are respectively provided with a first sealing groove. The end faces on both sides of the left fixed base are respectively provided with a fixing groove. The end faces on both sides of the right fixed base are provided with fixing holes that are adapted to the fixing groove. The outer wall of the sealing connection seat is provided with a sliding protrusion that is adapted to the sliding groove. The outer wall of the sealing connection seat below the sliding protrusion is provided with a second sealing groove. A sealing ring is provided between the first sealing groove and the second sealing groove.
[0013] Preferably, the diameter of the blow hole is 20-60 mm.
[0014] Preferably, the stirring and spraying arm is arc-shaped, with the same curvature as the bottom of the jacketed reactor, and the distance between the lower part of the stirring and spraying arm and the bottom of the jacketed reactor is 5-10 cm.
[0015] A normal-pressure liquid-phase hydrogenation reaction system manufactured according to the above scheme, by setting a circulating hydrogen inlet, a circulating hydrogen outlet, and a circulation section at the bottom of the jacketed reactor, can achieve full contact between hydrogen and the reaction liquid under normal pressure, thereby improving reaction efficiency and saving hydrogen consumption. Furthermore, the circulation section of this invention includes a hydrogen buffer tank and a hydrogen circulation pump, and the hydrogen buffer tank is connected to a hydrogen pipeline network, thus ensuring stable operation of the circulation section. Even further, this invention provides a hydrogen-powered stirring unit at the inner bottom of the jacketed reactor. The unit not only promotes the reaction but also saves energy. The stirring unit includes an inlet and a stirrer. The inlet allows hydrogen to enter and prevents leakage, while also limiting the movement of the stirrer. The stirrer makes the reaction process faster and more uniform, avoiding violent localized reactions. It also allows for hydrogen intake and hydrogen spraying to the bottom of the jacketed reactor, preventing material deposition and coking. The unit features reduced reaction time, increased production efficiency, reduced safety risks, and energy savings. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of this utility model.
[0017] Figure 2 This is a schematic diagram of the structure of the stirring and blowing arm of this utility model.
[0018] Figure 3 This is a schematic diagram of the structure of the fixing base of this utility model.
[0019] Figure 4 This is a schematic diagram showing the positional relationship between the stirring spray arm and the spray hole of this utility model.
[0020] In the diagram: 1. Jacketed reactor; 2. Inlet; 3. Outlet; 4. Circulating hydrogen outlet; 5. Circulating hydrogen inlet; 6. Hydrogen buffer tank; 7. Hydrogen circulation pump; 8. Furfuryl alcohol buffer tank; 9. Furfuryl alcohol storage tank; 10. Hydrogen pipeline network; 11. Hydrogen replenishment valve; 12. Stirring and blowing arm; 13. Sealing connection seat; 14. Blowing hole; 15. Left fixed seat; 16. Right fixed seat; 17. Fixing ring; 18. Bolt hole; 19. Sliding groove; 20. First sealing groove; 21. Fixing groove; 22. Fixing hole; 23. Sliding protrusion; 24. Second sealing groove; 25. Sealing ring. Detailed Implementation
[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0022] Reference Figure 1As shown, an atmospheric pressure liquid-phase hydrogenation reaction system includes a jacketed reactor 1. The jacketed reactor 1 has a feed inlet 2 on one side of its lower portion and a discharge outlet 3 on one side of its upper portion. A circulating hydrogen outlet 4 is located at the top of the jacketed reactor 1, and is connected to a circulating hydrogen inlet 5 located at the bottom of the jacketed reactor 1 via a circulation section. This invention changes the traditional hydrogen inlet and reaction method by placing the hydrogen inlet at the bottom of the jacketed reactor 1. The hydrogen entering the jacketed reactor 1 comes into full contact with the reaction liquid during its upward movement, thereby increasing the reaction rate and shortening the reaction cycle. Furthermore, the entire process can be carried out at atmospheric pressure, reducing operational risks. The circulating hydrogen outlet 4 at the top of the jacketed reactor 1 allows hydrogen to exit through the outlet and re-enter the jacketed reactor 1 through the circulation section and the circulating hydrogen inlet 5, thus saving hydrogen consumption. It should be noted that this utility model uses a jacketed reactor 1, the jacket of which is used for heat exchange, that is, for heating inside the jacketed reactor 1 in the initial stage of the reaction, and for cooling inside the jacketed reactor 1 during the reaction. The heat exchange medium is a conventional heat exchange medium.
[0023] Furthermore, the circulation section includes a hydrogen circulation pipeline disposed between the circulating hydrogen outlet 4 and the circulating hydrogen inlet 5, and a hydrogen buffer tank 6 and a hydrogen circulation pump 7 are provided on the hydrogen circulation pipeline. The circulation section of this invention, including the hydrogen buffer tank 6 and the hydrogen circulation pump 7, enables the circulation and reuse of hydrogen within the jacketed reactor 1, thereby improving the utilization rate of hydrogen.
[0024] Furthermore, the outlet 3 of the jacketed reactor 1 is connected to the inlet of the furfuryl alcohol buffer tank 8, and the outlet of the furfuryl alcohol buffer tank 8 is connected to the furfuryl alcohol storage tank 9 via a pipeline; the top gas phase outlet of the furfuryl alcohol buffer tank 8 is connected to the hydrogen circulation pipeline. The hydrogenation reaction described in this invention is an instantaneous reaction. The reaction liquid in the jacketed reactor 1 comes into contact with hydrogen, and the hydrogen retained in the upper part of the jacketed reactor 1 reacts with the reaction liquid, making the material in the upper part the reaction product furfuryl alcohol, as well as the entrained catalyst and hydrogen; the above materials enter the furfuryl alcohol buffer tank 8 through the outlet 3 to achieve continuous discharge; at the same time, the hydrogen released in the furfuryl alcohol buffer tank 8 can also be recycled in the circulation section.
[0025] Furthermore, the hydrogen buffer tank 6 is equipped with a hydrogen supply pipe connected to the hydrogen pipeline network 10, and a hydrogen supply valve 11 is provided on the hydrogen supply pipe. The hydrogen buffer tank 6 described in this invention not only serves as a storage tank for buffering circulating hydrogen, but also as a buffer tank for supplying hydrogen, thereby achieving the characteristic of continuous reaction.
[0026] Furthermore, the jacketed reactor 1 corresponding to the circulating hydrogen inlet 5 is equipped with a hydrogen-powered stirring unit. This stirring unit includes an inlet connected to the circulating hydrogen inlet 5 and a stirring element located at the bottom of the jacketed reactor 1 and connected to the inlet. By setting up a hydrogen-powered stirring unit, energy consumption required for stirring can be saved, while ensuring the introduction of hydrogen and thorough mixing of the hydrogen and reaction liquid, thereby improving reaction efficiency.
[0027] Furthermore, referring to Figure 1-4 As shown, the stirring component includes a stirring and spraying arm 12. The lower middle part of the stirring and spraying arm 12 is fixedly connected to the top of the sealing connection seat 13. Several spraying holes 14 are respectively opened on both sides of the stirring and spraying arm 12. The spraying holes 14 are oblique openings with an inclination angle of 30 to 60 degrees. In this utility model, a hydrogen circulation pump 7 is provided to pressurize the hydrogen. After pressurization, when the hydrogen enters the jacketed reactor 1 through the oblique opening, it forms a thrust, which drives the stirring and spraying arm 12 to rotate. As the stirring and spraying arm 12 rotates, the hydrogen forms bubbles in the furfural and catalyst mixture, floats upward, and increases the contact area between the hydrogen and furfural.
[0028] Furthermore, referring to Figure 2 , 3As shown, the air intake component includes a fixed base, which is composed of a left fixed base 15 and a right fixed base 16. The lower part of the left fixed base 15 and the right fixed base 16 are respectively provided with an integral fixed ring 17. The fixed ring 17 is provided with bolt holes 18 that are adapted to the bottom of the jacketed reactor 1. The middle part of the inner side of the left fixed base 15 and the right fixed base 16 are respectively provided with sliding grooves 19. The lower part of the inner side of the left fixed base 15 and the right fixed base 16 are respectively provided with first sealing grooves 20. The end faces on both sides of the left fixed base 15 are respectively provided with fixing grooves 21. The end faces on both sides of the right fixed base 16 are provided with fixing holes 22 that are adapted to the fixing grooves 21. The outer wall of the sealing connection seat 13 is provided with sliding protrusions 23 that are adapted to the sliding grooves 19. The outer wall of the sealing connection seat 13 below the sliding protrusions 23 is provided with a second sealing groove 24. A sealing ring 25 is provided between the first sealing groove 20 and the second sealing groove 24. In the above configuration, a sealing ring 25 is provided between the first sealing groove 20 and the second sealing groove 24 to prevent hydrogen leakage. The rotation of the stirring and blowing arm 12 drives the sealing connection seat 13 and the sliding protrusion 23 to rotate. The sliding protrusion 23 rotates along the moving groove 19 under the limitation of the sliding groove 19. At the same time, in order to facilitate installation, the fixed seat is a split structure. In use, the left fixed seat 15 or the right fixed seat 16 is first fixedly connected to the bottom of the jacketed reactor 1 through the bolt hole 18 on the fixed ring 17. Then, the sealing connection seat 13 at the bottom of the stirring and blowing arm 12 is placed inside it and the sealing ring 25 is put on, and the sliding protrusion 23 is adapted to the sliding groove 19. Then, the right fixed seat 16 or the left fixed seat 15 is matched with the fixed groove 21 and the fixed hole 22 (the fixed groove 21 and the fixed hole 22 not only make the structure more robust and reliable, but also have a positioning function). Finally, it is fixed to the bottom of the jacketed reactor 1 through the bolt hole 18 on the fixed ring 17.
[0029] Furthermore, the diameter of the blow hole 14 is 20-60 mm.
[0030] Furthermore, referring to Figure 1 As shown, the stirring and blowing arm 12 is arc-shaped, and its curvature is the same as that of the bottom of the jacketed reactor 1. The distance between the lower part of the stirring and blowing arm 12 and the bottom of the jacketed reactor 1 is 5-10 cm. This arrangement allows the hydrogen gas to blow the catalyst deposited at the bottom upwards, preventing the catalyst from accumulating at the bottom of the jacketed reactor 1 and causing coking.
[0031] The working principle of this utility model is as follows: When the production system is initially started, steam is introduced into the jacket of the jacketed reactor 1 to raise the overall temperature of the interior of the jacketed reactor 1. When the temperature required for the hydrogenation of furfural to produce furfuryl alcohol is reached, heating is stopped, and the mixture of furfural and catalyst enters the jacketed reactor 1 through the feed inlet 2. Hydrogen from the hydrogen pipeline 10 enters the jacketed reactor 1 through the hydrogen supply valve 11, the hydrogen buffer tank 6, and the hydrogen circulation pump 7. During the above process, the hydrogen circulation pump 7 pressurizes the hydrogen to 1-2 MPa. The hydrogen enters the jacketed reactor 1 through the spray hole 14 in the stirring spray arm 12, and at the same time, it generates thrust to drive the stirring spray arm 12 to rotate. The rotation of the stirring spray arm 12 drives the sealing connection seat 13 to rotate. During the rotation of the sealing connection seat 13, the sliding protrusion 23 rotates along the sliding groove 19, thereby ensuring that the rotation direction of the stirring spray arm 12 does not deviate. At the same time, the cooperation of the first sealing groove 20 and the second sealing groove 24 with the sealing ring 25 achieves the purpose of preventing hydrogen leakage. During the rotation of the stirring and blowing arm 12, hydrogen is blown through the bottom of the jacketed reactor 1 to prevent material from accumulating at the bottom of the jacketed reactor 1 and causing coking. At the same time, the hydrogen rises and reacts fully with the reaction liquid during the stirring process. The above reaction is an instantaneous exothermic reaction, and the heat generated can be carried away by the heat exchange medium (circulating water or heat transfer oil) introduced into the jacket. The reaction product furfural, along with its carried catalyst and hydrogen, enters the furfuryl alcohol buffer tank 8. Preferably, the furfuryl alcohol buffer tank 8 is kept at a certain liquid level, and hydrogen is released. The released hydrogen enters the circulation section through the gas phase outlet at the top of the furfuryl alcohol buffer tank 8 for circulation. Subsequently, the crude furfuryl alcohol in the furfuryl alcohol buffer tank 8 enters the furfuryl alcohol storage tank 9 to await subsequent purification. During the above process, the hydrogen at the top of the jacketed reactor 1 is enriched and enters the hydrogen buffer tank 6, and is then pressurized by the hydrogen circulation pump 7 and reused. When the amount of hydrogen is insufficient, it can be supplemented through the hydrogen pipeline network 10. It has the characteristics of reducing the reaction cycle, improving production efficiency, reducing safety risks, and saving energy.
[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A normal pressure liquid phase hydrogenation reaction system, the reaction system comprising a jacketed reactor (1), characterized in that: A feed port (2) is provided on one side of the lower part of the jacketed reactor (1), a discharge port (3) is provided on one side of the upper part of the jacketed reactor (1), a circulating hydrogen outlet (4) is provided on the top of the jacketed reactor (1), and the circulating hydrogen outlet (4) is connected to a circulating hydrogen inlet (5) provided at the bottom of the jacketed reactor (1) through a circulation part.
2. The atmospheric pressure liquid phase hydrogenation reaction system according to claim 1, characterized in that: The circulation part comprises a hydrogen circulation pipeline arranged between a circulating hydrogen outlet (4) and a circulating hydrogen inlet (5), and a hydrogen buffer tank (6) and a hydrogen circulation pump (7) are arranged on the hydrogen circulation pipeline.
3. A normal pressure liquid phase hydrogenation reaction system according to claim 2, characterized in that: The discharge port (3) of the jacketed reactor (1) is connected to the inlet of the furfuryl alcohol buffer tank (8), and the outlet of the furfuryl alcohol buffer tank (8) is connected to the furfuryl alcohol storage tank (9) through a pipeline; the top gas phase outlet of the furfuryl alcohol buffer tank (8) is connected to the hydrogen circulation pipeline.
4. The atmospheric pressure liquid phase hydrogenation reaction system according to claim 2, characterized in that: The hydrogen buffer tank (6) is provided with a hydrogen replenishment pipeline connected to the hydrogen pipeline network (10), and the hydrogen replenishment pipeline is provided with a hydrogen replenishment valve (11).
5. The atmospheric pressure liquid phase hydrogenation reaction system according to claim 1, characterized in that: A stirring unit powered by hydrogen is provided inside the jacketed reactor (1) corresponding to the circulating hydrogen inlet (5); The stirring unit comprises an air inlet connected to a circulating hydrogen inlet (5), and a stirring member arranged at the bottom of the jacketed reactor (1) and connected to the air inlet.
6. The atmospheric pressure liquid phase hydrogenation reaction system according to claim 5, characterized in that: The stirring member comprises a stirring spray arm (12), the lower middle position of the stirring spray arm (12) is fixedly connected to the top of the sealing connection seat (13), and a plurality of spray holes (14) are respectively opened on both sides of the stirring spray arm (12), and the spray holes (14) are inclined holes with an inclination angle of 30 to 60 degrees.
7. The atmospheric pressure liquid phase hydrogenation reaction system according to claim 6, characterized in that: The air inlet member comprises a fixing seat, which is composed of a left fixing seat (15) and a right fixing seat (16). The lower parts of the left fixing seat (15) and the right fixing seat (16) are respectively provided with fixing rings (17) of an integral structure. The fixing rings (17) are provided with bolt holes (18) adapted to the inner bottom of the jacketed reactor (1). The middle parts of the inner sides of the left fixing seat (15) and the right fixing seat (16) are respectively provided with sliding grooves (19). The lower parts of the inner sides of the left fixing seat (15) and the right fixing seat (16) are respectively provided with first sealing grooves (20); The end surfaces on both sides of the left fixing seat (15) are respectively provided with fixing grooves (21), and the end surfaces on both sides of the right fixing seat (16) are respectively provided with fixing holes (22) matched with the fixing grooves (21); A sliding protrusion (23) adapted to the sliding groove (19) is provided on the outer wall of the sealing connection seat (13), and a second sealing groove (24) is provided on the outer wall of the sealing connection seat (13) below the sliding protrusion (23); A sealing ring (25) is provided between the first sealing groove (20) and the second sealing groove (24).
8. The atmospheric pressure liquid phase hydrogenation reaction system according to claim 6, characterized in that: The diameter of the blowing hole (14) is 20 to 60 mm.
9. The atmospheric pressure liquid phase hydrogenation reaction system according to claim 6, characterized in that: The stirring and blowing arm (12) is arc-shaped, and has the same arc as the bottom of the jacketed reactor (1). The distance between the lower part of the stirring and blowing arm (12) and the bottom of the jacketed reactor (1) is 5 to 10 cm.