Loop fixed bed reactor system

Abstract

The invention relates to a loop fixed bed reactor system, and relates to the technical field of chemical engineering, the loop fixed bed reactor system comprises a plurality of groups of primary loop reactors and a plurality of groups of secondary loop reactors, the primary loop reactors and the secondary loop reactors have the same structure, and the primary loop reactors and the secondary loop reactors are connected in series through reactor outlet pipelines; each primary loop reactor comprises a fixed bed reaction unit, a circulating pump and an external heat exchanger, the fixed bed reaction unit, the circulating pump, the external heat exchanger, an external heat exchanger inlet pipeline and the circulating pipeline assembly are communicated, and two or more groups of primary loop reactors and secondary loop reactors are connected in series through reactor outlet pipelines; through a forced circulation flow mechanism driven by the venturi gas-liquid mixer and the circulating pump, the problems of mixing mass transfer efficiency, internal heat transfer and retention time of a traditional fixed bed reactor are fundamentally solved, and exponential improvement of the mixing effect and the heat transfer effect is achieved through rapid circulation of the circulating pump and the venturi gas-liquid mixer.

Description

Technical Field

[0001] This invention relates to the field of technology, and more particularly to a loop fixed-bed reactor system. Background Technology

[0002] In the field of chemical reaction engineering, the development of reactor systems has always been a key factor driving progress in chemical production. With the continuous development of the chemical industry, the demand for efficient, stable reactor systems capable of adapting to diverse reaction requirements is increasing. Advanced reactor systems can improve reaction efficiency, reduce energy consumption, and enhance product quality, thereby bringing significant economic and environmental benefits to chemical enterprises. They not only help promote the transformation and upgrading of traditional chemical industries but also provide strong technical support for the development of emerging chemical fields.

[0003] In traditional chemical production, various techniques have been conventionally employed to achieve chemical reaction processes. For simple reactions, single-stage fixed-bed reactors are commonly used due to their relatively simple structure and ability to meet basic reaction requirements. For reactions with more demanding conditions, multi-stage series fixed-bed reactors are employed, gradually altering reaction conditions to accelerate the reaction. Fixed-bed reactors with internal heat exchangers are also used to control reaction temperature. Additionally, batch reactors are employed due to their excellent mixing properties, ensuring thorough contact between reactants. These techniques are widely used in chemical production, to a certain extent meeting the needs of different types of chemical reactions.

[0004] However, traditional reactor systems have significant drawbacks. Conventional fixed-bed reactor systems often struggle to adapt flexibly to complex reaction processes, the transitions between different reaction stages are not smooth enough, and efficient material circulation and heat exchange cannot be achieved, which greatly limits the improvement of reaction efficiency. Summary of the Invention

[0005] This invention provides a loop fixed-bed reactor system to overcome the deficiencies in the prior art.

[0006] This invention provides a fixed-bed loop reactor system, comprising: multiple sets of primary loop reactors and multiple sets of secondary loop reactors. The primary loop reactors and the secondary loop reactors have the same structure and are connected in series via reactor outlet pipelines. Each primary loop reactor includes a fixed-bed reaction unit, a circulating pump, and an external heat exchanger. The fixed-bed reaction unit, the circulating pump, the external heat exchanger, the external heat exchanger inlet pipeline, and the circulating pipeline assembly are connected.

[0007] Beneficial effects: The reactants enter the primary loop reactor for reaction and transfer. The circulating pump rotates at high speed through the impeller to provide power for material circulation. It is fluidly connected to the circulating mixing system through pipelines. The external heat exchanger is independent of the reaction unit and is used to exchange heat with the circulating materials. The forced circulation flow mechanism driven by the Venturi gas-liquid mixer and the circulating pump fundamentally solves the mixing and mass transfer efficiency problem of traditional fixed bed reactors.

[0008] Preferably, the fixed-bed reaction unit includes a reactor shell, on which are provided an inlet for the reactant, a gas loop outlet, a gas loop inlet, a fixed-bed reaction unit outlet, and a catalyst loading inlet. Inside the reactor shell are provided a Venturi gas-liquid mixer, a gas-liquid mixing diffusion tube, a catalyst basket, a jacketed fluid channel, a catalyst-filled fixed bed, and a gas collection area. The bottom of the reactor shell is provided with a catalyst loading outlet, which is connected to the catalyst-filled fixed bed. The inlet for the reactant is connected to the catalyst-filled fixed bed, the catalyst loading inlet is connected to the catalyst basket, the fixed-bed reaction unit outlet is connected to the jacketed fluid channel, the gas loop outlet and the gas loop inlet are respectively connected to the gas collection area, and the gas loop inlet is connected to the gas-liquid mixing diffusion tube through the Venturi gas-liquid mixer.

[0009] Beneficial effects: The gas-liquid mixing diffuser of the Venturi gas-liquid mixer extends to the bottom of the catalyst basket inside the fixed bed. The fluid passes through it and enters the jacketed fluid channel. The fluid undergoes gas-liquid separation, and the final reactant liquid flows out of the fixed bed reaction unit through the outlet of the fixed bed reaction unit and flows into the inlet pipe of the external heat exchanger. The fixed bed reactor is equipped with a catalyst loading inlet at the top and a catalyst loading outlet at the bottom for loading and unloading the catalyst.

[0010] Preferably, the liquid flow rate in the nozzle of the Venturi gas-liquid mixer is 8-15 m / s, the gas-liquid mixing diffuser of the Venturi gas-liquid mixer extends to the bottom of the catalyst basket in the fixed bed, the internal fluid residence time is less than 30 s, and the circulating gas flow rate is 0.5-15 L / s.

[0011] Beneficial effects: High-speed liquid ensures that the gas is broken into microbubbles, enhancing mass transfer; short residence time suppresses side reactions; and a wide gas flow rate range adapts to different processes such as hydrogenation and oxidation.

[0012] Preferably, the external heat exchanger is provided with a cold / hot medium inlet and a cold / hot medium outlet, and the circulation pipeline assembly is provided with a liquid circulation loop flow meter.

[0013] Beneficial effects: The inlet and outlet of the hot and cold medium improve the heat exchange efficiency of the external heat exchanger, and the liquid circulation loop flow meter monitors the flow rate in the circulation pipeline assembly in real time.

[0014] Preferably, a control valve is installed on the reactor outlet pipe, and a back pressure valve is installed on the reactor outlet pipe of the secondary loop reactor.

[0015] Beneficial effects: A control valve is installed on the outlet pipeline of the primary reactor to regulate the flow rate; a back pressure valve is installed at the outlet of the secondary reactor to maintain the system pressure. The back pressure valve ensures a high-pressure environment for the secondary reactor, adapts to the needs of series reactions, and allows for precise flow rate regulation, ensuring material balance between multiple stages.

[0016] Preferably, the catalyst basket is a cylindrical shape with a sealed bottom, and the top and upper side walls are equipped with filters for fixing catalyst particles but allowing liquid and gas to pass through, with the linear velocity of the liquid in the catalyst basket being greater than 0.5 m / s.

[0017] Beneficial effects: The filter screen fixes the catalyst and prevents particle loss, allows gas and liquid to pass through, and high-speed linear flushing prevents local coking or blockage and suppresses dead zones.

[0018] Preferably, a liquid circulation loop flow meter and a gas circulation loop flow meter are provided on the circulation pipeline assembly between the external heat exchanger and the Venturi gas-liquid mixer.

[0019] Beneficial effects: Simultaneous installation of liquid flow meters and gas flow meters on the circulation pipeline monitors the gas-liquid two-phase flow, enables real-time control of the gas-liquid ratio, provides data support for optimizing mixing efficiency, provides immediate alarm for abnormal flow, facilitates fault diagnosis, and ensures system safety.

[0020] Preferably, the interlayer fluid channel is an annular fluid channel located between the catalyst basket and the reactor shell, with a channel gap of 0.5-15 mm.

[0021] Beneficial effects: The jacketed fluid channel encloses the catalyst basket, guiding the fluid to flow along the reactor shell. The narrow slit design forces the fluid to be evenly distributed, eliminating the wall effect and creating a uniform flow field. The thin fluid layer facilitates heat exchange with the shell, enhancing heat transfer. The compact structure saves reactor space.

[0022] Preferably, the primary loop reactor includes a controller, which is electrically connected to the circulating pump, the liquid circulating loop flow meter, and the gas loop flow meter.

[0023] Beneficial effects: The controller is electrically connected to the circulating pump, the liquid circulating loop flow meter, and the gas loop flow meter to form a control loop; the controller receives signals from the liquid circulating loop flow meter and the gas loop flow meter, and adjusts the liquid loop flow by controlling the circulating pump and controls the gas loop flow to achieve gas-liquid mixing regulation.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. High-efficiency heat transfer: The external heat exchanger has independent temperature control, avoiding temperature gradients within the reactor;

[0026] 2. Enhanced mass transfer: Forced circulation improves the contact efficiency between reactants and catalyst;

[0027] 3. Flexible connection: adaptable to multi-step reactions or high conversion rate requirements. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the cascade reaction system provided in the embodiments of this application;

[0030] Figure 2 This is a schematic diagram of the composition of the loop fixed-bed reactor system provided in the embodiments of this application;

[0031] Figure 3 This is a schematic diagram of a fixed-bed reaction unit provided in an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the gas-liquid-fluid reaction process provided in the embodiments of this application.

[0033] Figure label:

[0034] 1. Fixed-bed reaction unit; 2. Circulating pump; 3. External heat exchanger; 4. Venturi gas-liquid mixer; 5. Gas-liquid mixing diffuser; 6. Gas loop outlet; 7. Gas loop inlet; 8. Reactor shell; 9. Catalyst basket; 10. Jacketed fluid channel; 11. Filter screen; 12. Catalyst-packed fixed bed; 13. Reactant inlet; 14. Fixed-bed reaction unit outlet; 15. External heat exchanger inlet piping; 16. Circulating piping assembly; 17. Gas loop flow meter; 18. Liquid circulating loop flow meter 19. Controller; 20. Catalyst filling inlet; 21. Catalyst filling outlet; 22. Gas collection zone; 23. Hot and cold medium inlet; 24. Hot and cold medium outlet; 25. Reactor outlet pipeline; 26. Control valve; 27. Secondary loop reactor reactant inlet; 28. Secondary loop reactor; 29. ​​Secondary reactor circulation pump; 30. Secondary reactor external heat exchanger; 31. Secondary reactor Venturi gas-liquid mixer; 32. Back pressure valve; 33. Secondary reactor outlet control valve; 34. Primary loop reactor. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0036] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms 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" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0037] The present invention provides the following embodiments.

[0038] Example 1

[0039] This invention provides a loop fixed-bed reactor system, such as... Figures 1-2 As shown, it includes: multiple sets of primary loop reactors 34 and multiple sets of secondary loop reactors 28. The primary loop reactors 34 and the secondary loop reactors 28 have the same structure. The primary loop reactors 34 and the secondary loop reactors 28 are connected in series through reactor outlet pipes 25. The primary loop reactor 34 includes a fixed bed reaction unit 1, a circulating pump 2, and an external heat exchanger 3. The fixed bed reaction unit 1, the circulating pump 2, the external heat exchanger 3, the external heat exchanger inlet pipe 15, and the circulating pipeline assembly 16 are connected.

[0040] The working principle and beneficial effects of the above technical solution are as follows: Two or more primary loop reactors 34 and secondary loop reactors 28 are connected in series through reactor outlet pipes 25. The reactants enter the primary loop reactors 34 and secondary loop reactors 28 to achieve continuous cascade reaction. Each reactor is equipped with a material inlet and outlet, which can realize online raw material replenishment and material sampling functions in each reactor. The reactants enter the primary loop reactor 34 for reaction and transfer. The circulation pump 2 is used to provide material circulation power through high-speed impeller rotation. It is fluidly connected to the circulation mixing system through pipeline. The external heat exchanger 3 is independent of the reaction unit and is used to exchange heat with the circulating material. The forced circulation flow mechanism driven by the Venturi gas-liquid mixer 4 and the circulation pump 2 fundamentally solves the problems of mixing mass transfer efficiency, internal heat transfer and residence time of traditional fixed bed reactors. The rapid circulation of the circulation pump 2 and the Venturi gas-liquid mixer 4 achieve an exponential improvement in mixing effect and heat transfer effect.

[0041] Example 2

[0042] Based on Example 1, such as Figures 2-4 As shown, the fixed-bed reaction unit 1 includes a reactor shell 8. The reactor shell 8 is provided with a material inlet 13, a gas circuit outlet 6, a gas circuit inlet 7, a fixed-bed reaction unit outlet 14, and a catalyst loading inlet 20. Inside the reactor shell 8 are a Venturi gas-liquid mixer 4, a gas-liquid mixing diffusion pipe 5, a catalyst basket 9, a jacketed fluid channel 10, a catalyst-filled fixed bed 12, and a gas collection area 22. The bottom of the reactor shell 8 is provided with a catalyst loading outlet 21, which is connected to the catalyst-filled fixed bed 12. The material inlet 13 is connected to the catalyst-filled fixed bed 12. The catalyst loading inlet 20 is connected to the catalyst basket 9. The fixed-bed reaction unit outlet 14 is connected to the jacketed fluid channel 10. The gas circuit outlet 6 and the gas circuit inlet 7 are respectively connected to the gas collection area 22. The gas circuit inlet 7 is connected to the gas-liquid mixing diffusion pipe 5 through the Venturi gas-liquid mixer 4.

[0043] The working principle and beneficial effects of the above technical solution are as follows: The reactor shell 8 fixes the reactant inlet 13, gas loop outlet 6, gas loop inlet 7, fixed bed reaction unit outlet 14, and catalyst filling inlet 20. The reactor shell 8 protects the gas-liquid mixing diffuser 5, catalyst basket 9, jacketed fluid channel 10, catalyst-filled fixed bed 12, and gas collection area 22. The reactant enters the reactor shell 8 of the fixed bed reaction unit 1 through the reactant inlet 13. The fixed bed reaction unit 1 is equipped with a Venturi gas-liquid mixer 4, which is connected to the gas-liquid mixing diffuser 5. The circulating pump 2 fully circulates the liquid in the system. The circulating liquid forms gas loop power in the Venturi gas-liquid mixer 4 and flows through the gas loop outlet 6, gas loop inlet 7, gas loop flow meter 17, etc. The gas circuit is formed to draw in the gas in the gas collection area 22 to form a gas-liquid mixture. The mixture is further diffused and mixed in the gas-liquid mixing diffuser 5 connected to the Venturi gas-liquid mixer 4 to form a gas-liquid mixture. The gas-liquid mixture flows through the gas-liquid mixing diffuser 5 connected to the Venturi gas-liquid mixer 4 and flows in the catalyst-filled fixed bed 12. The gas-liquid mixing diffuser 5 of the Venturi gas-liquid mixer 4 extends to the bottom of the catalyst basket 9 in the fixed bed. The fluid passes through it and enters the interlayer fluid channel 10. The fluid undergoes gas-liquid separation and the final reactant liquid flows out of the fixed bed reaction unit 1 through the fixed bed reaction unit outlet 14 and flows into the external heat exchanger inlet pipe 15. The fixed bed reactor is provided with a catalyst filling inlet 20 at the top and a catalyst filling outlet 21 at the bottom for catalyst loading and unloading.

[0044] Example 3

[0045] Based on Example 2, such as Figures 2-4 As shown, the liquid flow rate in the nozzle of the Venturi gas-liquid mixer 4 is 8-15 m / s, the gas-liquid mixing diffusion tube 5 of the Venturi gas-liquid mixer 4 extends to the bottom of the catalyst basket 9 in the fixed bed, the internal fluid residence time is less than 30 s, and the circulating gas flow rate is 0.5-15 L / s.

[0046] The working principle and beneficial effects of the above technical solution are as follows: the nozzle of the Venturi gas-liquid mixer 4 generates negative pressure to draw in gas at a high-speed liquid flow rate of 8–15 m / s. The mixed fluid is directly sprayed to the bottom of the catalyst bed through the diffuser, with a residence time of less than 30 s. The circulating gas flow rate of 0.5–15 L / s is adapted to different reaction requirements. The high-speed liquid ensures that the gas is broken into microbubbles, which enhances mass transfer. The short residence time suppresses side reactions. The wide gas flow rate range is suitable for different processes such as hydrogenation and oxidation.

[0047] Example 4

[0048] Based on Example 3, such as Figures 2-4As shown, the external heat exchanger 3 is provided with a cold / hot medium inlet 23 and a cold / hot medium outlet 24, and the circulation pipe assembly 16 is provided with a liquid circulation loop flow meter 18.

[0049] The working principle and beneficial effects of the above technical solution are as follows: the inlet 23 and outlet 24 of the cold and hot medium improve the heat exchange efficiency of the external heat exchanger 3, and the liquid circulation loop flow meter 18 monitors the flow rate in the circulation pipe assembly 16 in real time.

[0050] Example 5

[0051] Based on Example 4, such as Figures 2-4 As shown, a control valve 26 is installed on the reactor outlet pipe 25, and a back pressure valve 32 is installed on the reactor outlet pipe 25 of the secondary loop reactor 28.

[0052] The working principle and beneficial effects of the above technical solution are as follows: the outlet pipe 25 of the first-stage reactor is equipped with a control valve 26 to regulate the flow rate; the reactor outlet pipe 25 of the second-stage loop reactor 28 is equipped with a back pressure valve 32 to maintain the system pressure. The back pressure valve 32 ensures the high-pressure environment of the second-stage reactor, adapts to the needs of series reaction, and accurately regulates the flow rate to ensure the material balance between multiple stages.

[0053] Example 6

[0054] Based on Example 5, such as Figures 2-4 As shown, the catalyst basket 9 is a cylindrical shape with a sealed bottom, and the top and upper side walls are equipped with filters 11 for fixing catalyst particles but allowing liquid and gas to pass through. The linear velocity of the liquid in the catalyst basket 9 is greater than 0.5 m / s.

[0055] The working principle and beneficial effects of the above technical solution are as follows: the catalyst basket 9 is a bottom-sealed cylindrical shape, with a filter screen 11 installed on the side wall or top; the liquid penetrates the catalyst bed at a linear velocity greater than 0.5 m / s, the filter screen 11 fixes the catalyst to prevent particle loss, allows gas and liquid to pass through, and the high linear velocity flushing prevents local coking or blockage and suppresses dead zones.

[0056] Example 7

[0057] Based on Example 6, such as Figures 2-4 As shown, a liquid circulation loop flow meter 18 and a gas circulation loop flow meter 17 are provided on the circulation pipe assembly 16 between the external heat exchanger 3 and the Venturi gas-liquid mixer 4.

[0058] The working principle and beneficial effects of the above technical solution are as follows: liquid flow meters and gas flow meters are installed on the circulation pipeline to monitor the gas-liquid two-phase flow, and the gas-liquid ratio is adjusted in real time to provide data support for optimizing mixing efficiency. Abnormal flow will be alarmed immediately to perform fault diagnosis and ensure system safety.

[0059] Example 8

[0060] Based on Example 7, such as Figures 2-4 As shown, the interlayer fluid channel 10 is an annular fluid channel located between the catalyst basket 9 and the reactor shell 8, with a channel gap of 0.5-15 mm.

[0061] The working principle and beneficial effects of the above technical solution are as follows: the jacketed fluid channel 10 is an annular narrow slit of 0.5–15 mm, which wraps the catalyst basket 9 and guides the fluid to flow along the reactor shell 8. The narrow slit design forces the fluid to be evenly distributed, eliminates the wall effect, and creates a uniform flow field. The thin layer of fluid is conducive to heat exchange with the shell, enhances heat transfer, and has a compact structure that saves reactor space.

[0062] Example 9

[0063] Based on Example 8, such as Figures 2-4 As shown, the primary loop reactor 34 includes a controller 19, which is electrically connected to the circulating pump 2, the liquid circulating loop flow meter 18, and the gas loop flow meter 17.

[0064] The working principle and beneficial effects of the above technical solution are as follows: the controller 19 is electrically connected to the circulating pump 2, the liquid circulating loop flow meter 18, and the gas loop flow meter 17 to form a control loop; the controller 19 receives signals from the liquid circulating loop flow meter 18 and the gas loop flow meter 17, and adjusts the liquid loop flow by controlling the circulating pump 2 to control the gas loop flow, thereby realizing the gas-liquid mixing regulation.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to 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 loop fixed-bed reactor system, characterized in that, include: Multiple sets of primary loop reactors (34) and multiple sets of secondary loop reactors (28) are provided. The primary loop reactors (34) and the secondary loop reactors (28) have the same structure. The primary loop reactors (34) and the secondary loop reactors (28) are connected in series through reactor outlet pipes (25). The primary loop reactor (34) includes a fixed bed reaction unit (1), a circulating pump (2), and an external heat exchanger (3). The fixed bed reaction unit (1), the circulating pump (2), the external heat exchanger (3), the external heat exchanger inlet pipe (15), and the circulating pipeline assembly (16) are connected.

2. The loop fixed-bed reactor system according to claim 1, characterized in that, The fixed-bed reaction unit (1) includes a reactor shell (8), on which are provided an inlet (13) for the material to be reacted, a gas circuit outlet (6), a gas circuit inlet (7), a fixed-bed reaction unit outlet (14), and a catalyst loading inlet (20). Inside the reactor shell (8) are provided a Venturi gas-liquid mixer (4), a gas-liquid mixing diffuser (5), a catalyst basket (9), a jacketed fluid channel (10), a catalyst-filled fixed bed (12), and a gas collection area (22). At the bottom of the reactor shell (8) is a catalyst loading outlet (21). The catalyst filling outlet (21) is connected to the catalyst-filled fixed bed (12), the reactant inlet (13) is connected to the catalyst-filled fixed bed (12), the catalyst filling inlet (20) is connected to the catalyst basket (9), the fixed bed reaction unit outlet (14) is connected to the interlayer fluid channel (10), the gas circuit outlet (6) and the gas circuit inlet (7) are respectively connected to the gas collection area (22), and the gas circuit inlet (7) is connected to the gas-liquid mixing diffuser (5) through the Venturi gas-liquid mixer (4).

3. A loop fixed-bed reactor system according to claim 2, characterized in that, The liquid flow rate in the nozzle of the Venturi gas-liquid mixer (4) is 8-15 m / s. The gas-liquid mixing diffusion tube (5) of the Venturi gas-liquid mixer (4) extends into the bottom of the catalyst basket (9) in the fixed bed. The internal fluid residence time is less than 30 s, and the circulating gas flow rate is 0.5-15 L / s.

4. A loop fixed-bed reactor system according to claim 3, characterized in that, The external heat exchanger (3) is provided with a cold and hot medium inlet (23) and a cold and hot medium outlet (24), and the circulating pipe assembly (16) is provided with a liquid circulating loop flow meter (18).

5. A loop fixed-bed reactor system according to claim 4, characterized in that, A control valve (26) is installed on the reactor outlet pipe (25), and a back pressure valve (32) is installed on the reactor outlet pipe (25) of the secondary loop reactor (28).

6. A loop fixed-bed reactor system according to claim 2, characterized in that, The catalyst basket (9) is a cylindrical shape with a sealed bottom. The top and upper side walls are equipped with filters (11) for fixing catalyst particles but allowing liquid and gas to pass through. The linear velocity of the liquid in the catalyst basket (9) is greater than 0.5 m / s.

7. A loop fixed-bed reactor system according to claim 2, characterized in that, A liquid circulation loop flow meter (18) and a gas circulation loop flow meter (17) are provided on the circulation pipe assembly (16) between the external heat exchanger (3) and the Venturi gas-liquid mixer (4).

8. A loop fixed-bed reactor system according to claim 2, characterized in that, The interlayer fluid channel (10) is an annular fluid channel located between the catalyst basket (9) and the reactor shell (8), with a channel gap of 0.5-15 mm.

9. A loop fixed-bed reactor system according to claim 4, characterized in that, The primary loop reactor (34) includes a controller (19) which is electrically connected to the circulating pump (2), the liquid circulating loop flow meter (18), and the gas loop flow meter (17).

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