Continuous microchannel reactor system with multiple temperature zones and temperature control method

Abstract

The present application relates to the field of micro-channel reaction, and particularly relates to a continuous micro-channel reaction system with multiple temperature zones and a temperature control method. The system comprises a water tank, multiple temperature modification assemblies and micro-channel reactors corresponding to the temperature modification assemblies, and the water tank is provided with a heating element. The temperature modification assembly comprises a heat conduction column, a water outlet main pipe and multiple winding metal pipes which are wound on the heat conduction column from bottom to top. The lower end opening of the lowest winding metal pipe is connected to the water tank through a water pump. The adjacent winding metal pipes are connected through metal pipe water inlet valves. The upper end opening of each winding metal pipe is connected to the water outlet main pipe through a water outlet valve. The micro-channel pipelines of each micro-channel reactor are connected in sequence through liquid discharge valves. The inlet of the water bath layer of each micro-channel reactor is connected to the corresponding water outlet main pipe, and the outlet is connected to the water tank. The present application can independently heat the multiple micro-channel reactors participating in the continuous reaction according to the requirements of different reactions and different stages, so as to ensure the safe and efficient reaction.

Description

Technical Field

[0001] This invention relates to the field of microchannel reaction technology, specifically to a continuous microchannel reaction system with multiple temperature zones and a temperature control method. Background Technology

[0002] A microchannel reactor is a three-dimensional structural element used to carry out chemical reactions, manufactured in a solid matrix using specialized microfabrication techniques. Microchannel reactors typically feature channels of small size and diverse shapes, through which fluids flow and the desired reactions occur. Possessing a very large specific surface area, microchannel reactors offer significantly better heat and mass transfer capabilities compared to reaction vessels.

[0003] In the reaction process, sometimes multiple microchannel reactors are used. The reaction takes place in one microchannel reactor and the product is transferred to the next microchannel reactor to continue the reaction as a reactant. The reaction temperature requirements of each microchannel reactor are also different.

[0004] Furthermore, exothermic reactions are a very common type of reaction. Timely heat exchange in these reactions significantly impacts the overall reaction outcome and can even pose substantial safety hazards. Many exothermic reactions currently being investigated release a large amount of heat during the reaction process, causing the reaction temperature to spike. This directly affects the overall reaction outcome, and if the heat of reaction cannot be controlled in time, it can lead to safety issues such as explosions.

[0005] Therefore, there is an urgent need to design a continuous microchannel reaction system with multiple temperature zones to meet the heat exchange requirements of multiple microchannel reactors at different stages and ensure the safe and efficient conduct of the reaction. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a continuous microchannel reaction system with multiple temperature zones. It can independently exchange heat on multiple microchannel reactors participating in the continuous reaction according to the needs of different reactions and different stages, so as to ensure the safe and efficient conduct of the reaction.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is: a continuous microchannel reaction system with multiple temperature zones, comprising a water tank, multiple temperature modification components, and multiple microchannel reactors, wherein the water tank is equipped with a heating element, and each microchannel reactor corresponds to one temperature modification component; wherein...

[0008] Each temperature control component includes a heat-conducting column, a main water outlet pipe, and multiple wound metal tubes, which are wound sequentially around the heat-conducting column from bottom to top. The lower end opening of the lowest wound metal tube is connected to the water tank via a water pump. Adjacent wound metal tubes are connected by metal tube inlet valves. The upper end opening of each wound metal tube is also connected to the main water outlet pipe via an outlet valve.

[0009] The microchannel pipelines of each microchannel reactor are connected in sequence through drain valves; the inlet of the water bath of each microchannel reactor is connected to the main outlet of the corresponding temperature modification component, and the outlet is connected to the water tank through a return water pipe.

[0010] The temperature modification component is configured to adjust the water temperature held in the water bath of the corresponding microchannel reactor through the main outlet pipe by adjusting the number of wound metal tubes it uses, so as to heat or dissipate heat from the corresponding microchannel pipeline.

[0011] Furthermore, to ensure stable water temperature and prevent impurities and sedimentation, a first partition and a second partition are fixedly connected from left to right inside the water tank, dividing the tank into a heating zone, a water flow zone, and a water outlet zone from left to right; wherein,

[0012] The upper end of the first partition is connected to the water tank, and there is a gap between the lower end of the partition and the water tank;

[0013] The lower end of the second partition is connected to the water tank, and a gap is left between the upper end and the water tank;

[0014] The heating element is installed in the heating zone. The lower end opening of the bottom winding metal tube of each temperature control component is directly connected to the water outlet zone through the water inlet pipe equipped with the water pump, and the return water pipe is directly connected to the heating zone.

[0015] Furthermore, to enable the temperature modification components to dissipate heat better, each temperature modification component also includes a temperature modification component mounting box and a heat exchange plate. The heat conduction column is installed inside the temperature modification component mounting box, the heat exchange plate is installed on the corresponding heat conduction column, and the portion extending out of the temperature modification component mounting box is equipped with heat dissipation fins.

[0016] Furthermore, in order to save space and ensure that each heat dissipation column can dissipate heat evenly, the heat conduction columns are stacked sequentially from bottom to top, and heat insulation plates are arranged between adjacent heat conduction columns.

[0017] Furthermore, to facilitate the transfer of materials within each microchannel reactor and save space, the microchannel reactors are arranged sequentially in the vertical direction. In two adjacent microchannel reactors, the lower opening of the upper microchannel pipe is connected to the upper opening of the lower microchannel pipe through a drain pipe equipped with the drain valve.

[0018] To further facilitate the introduction of new reactants into each microchannel, the upper opening of the uppermost microchannel and the drain pipe are respectively connected to an inlet pipe, or each microchannel is respectively connected to an inlet pipe; the inlet pipe is equipped with an inlet valve.

[0019] Furthermore, to facilitate the discharge of the final product, the lower end of the microchannel tube is connected to a final discharge pipe, which is equipped with a final discharge valve.

[0020] Furthermore, in order to place the water pumps in an orderly manner and facilitate heat dissipation, the continuous microchannel reaction system with multiple temperature zones also includes a water pump mounting box. The water pump mounting box has multiple layers, with one water pump installed on each layer, and each layer is provided with air vents.

[0021] This invention also provides a method for temperature control of a continuous microchannel reaction system with multiple temperature zones, the method comprising:

[0022] The reactants react sequentially in the microchannels of each microchannel reactor, and the product in the previous microchannel is used as the reactant in the next microchannel.

[0023] Adjust the opening and closing status of the inlet and outlet valves of each metal pipe on the corresponding temperature modification component so that the water in the water tank enters the water bath of the corresponding microchannel reactor after being pumped by the corresponding water pump through the corresponding number of wound metal pipes, and adjust the temperature in the corresponding microchannel pipeline.

[0024] For each microchannel reactor:

[0025] Before and / or in the early stages of the reaction, water in the tank is pumped by a corresponding water pump through a small number of wound metal tubes into the water bath of the microchannel reactor, heating the microchannel tubing to the preset reaction temperature.

[0026] If an exothermic reaction occurs within the microchannel pipeline, the water in the tank, pumped by a corresponding water pump, passes through a large number of wound metal tubes before entering the water bath layer of the microchannel reactor, thus maintaining the preset reaction temperature of the microchannel pipeline.

[0027] By adopting the above technical solution, the present invention has the following beneficial effects:

[0028] This invention is configured with multiple microchannel reactors connected in sequence. The product in one microchannel reactor can easily enter the next microchannel reactor and participate in the reaction as a reactant. Therefore, this invention can easily carry out continuous reactions. Furthermore, this invention uses temperature control components corresponding to the microchannel reactors to independently control the temperature of the microchannel reactors, ensuring that the system has multiple temperature zones and that each microchannel reactor can be at its required reaction temperature, thus ensuring efficient reaction.

[0029] Before or in the early stages of a reaction, hot water from the tank can enter the temperature modification component and pass through a small amount of winding metal tubing, or even none at all, minimizing heat loss. This allows the hot water to enter the water bath of the corresponding microchannel reactor at a higher temperature, heating the microchannel tubing and ensuring it reaches the required reaction temperature quickly, thus guaranteeing efficient reaction. After the reaction has proceeded normally, if the microchannel is undergoing an exothermic reaction, the hot water can enter the temperature modification component and pass through a larger amount of winding metal tubing, minimizing heat loss. This allows the hot water to enter the water bath of the microchannel reactor at a lower temperature, carrying away heat from the microchannel tubing. This ensures the microchannel reactor maintains the optimal temperature even during exothermic reactions, significantly improving reaction efficiency and avoiding safety hazards caused by temperature spikes due to excessive heat release. Therefore, this invention enables independent heat exchange for multiple microchannel reactors participating in continuous reactions, based on the needs of different reactions and stages, ensuring safe and efficient reaction processes.

[0030] Most reactions within the microchannel reactors are exothermic. The microchannel reactors are put into use and react sequentially. The heat generated during the reaction in the previous microchannel reactor is carried away by the water in the water bath and returned to the water tank through the return water pipe. Therefore, the heat generated in the previous microchannel reactor can be used to heat the next microchannel reactor before or at the beginning of the reaction, thus saving energy. In addition, the water in the water tank is recycled. Therefore, the operating cost of the entire device is low and it is easy to promote and use. Attached Figure Description

[0031] Figure 1 This is an axial view of the continuous microchannel reaction system with multiple temperature zones of the present invention.

[0032] Figure 2 for Figure 1 A sectional view;

[0033] Figure 3 This is a cross-sectional view of the housing for multiple temperature-modifying components of the present invention;

[0034] Figure 4 for Figure 3 The bottommost cross-sectional view of the temperature-modifying component mounting box;

[0035] Figure 5 for Figure 4 Enlarged view of part A;

[0036] Figure 6 This is a cross-sectional view of the multiple microchannel reactors of the present invention;

[0037] Figure 7 for Figure 6 Enlarged view of part B;

[0038] Figure 8 This is a cross-sectional view of the water pump mounting box of the present invention;

[0039] In the diagram, 1. Water tank; 2. Microchannel reactor; 21. Microchannel pipeline; 3. Heat-conducting column; 4. Main outlet pipe; 5. Winded metal tube; 6. Inlet pipe; 7. Water pump; 8. Metal pipe inlet valve; 9. Outlet branch pipe; 10. Outlet valve; 11. Drain pipe; 12. Drain valve; 13. Return pipe; 14. First partition; 15. Second partition; 16. Heating zone; 17. Water passage zone; 18. Outlet zone; 19. Temperature modification component housing box; 20. Heat exchange plate; 200. Heat dissipation fins; 22. Insulation plate; 23. Inlet pipe; 24. Inlet valve; 25. Final drain pipe; 26. Final drain valve; 27. Water pump housing box; 28. Air vent; 29. ​​Heating element. Detailed Implementation

[0040] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0041] Example 1

[0042] like Figures 1 to 8 As shown, a continuous microchannel reaction system with multiple temperature zones includes a water tank 1, multiple temperature modification components, and multiple microchannel reactors 2. The water tank 1 is equipped with a heating element 29, and each microchannel reactor 2 corresponds to one temperature modification component; wherein,

[0043] Each temperature control component includes a heat-conducting column 3, a main water outlet pipe 4, and multiple wound metal tubes 5. The multiple wound metal tubes 5 are wound sequentially on the heat-conducting column 3 from bottom to top and connected in sequence. The lower end opening of the lowest wound metal tube 5 is connected to the water tank 1 through a water inlet pipe 6, and a water pump 7 is installed on the water inlet pipe 6. A metal tube water inlet valve 8 is installed between adjacent wound metal tubes 5. The upper end opening of each wound metal tube 5 is also connected to the main water outlet pipe 4 through a water outlet branch pipe 9, and a water outlet valve 10 is installed on each water outlet branch pipe 9.

[0044] Each microchannel reactor 2 has its microchannel pipeline 21 connected in sequence via a drain pipe 11, and a drain valve 12 is installed on the drain pipe 11. The inlet of the water bath layer of each microchannel reactor 2 is connected to the main outlet pipe 4 of the corresponding temperature modification component, and the outlet is connected to the water tank 1 via a return pipe 13.

[0045] The temperature modification component is configured to adjust the water temperature held in the water bath of the corresponding microchannel reactor 2 through the outlet main pipe 4 by adjusting the number of the wound metal tubes 5 used, so as to heat or dissipate heat to the corresponding microchannel pipeline 21.

[0046] In this embodiment, when the microchannel pipeline 21 needs to be heated, in order to minimize heat loss at the temperature modification component, considering that the water flows from bottom to top in each of the wound metal tubes 5, the lower end opening of the lowest wound metal tube 5 can also be connected to the main water outlet pipe 4 through the water outlet branch pipe 9 equipped with the water outlet valve 10. A metal tube inlet valve 8 is also configured at a position slightly above the main water outlet pipe 4. In this way, by closing the metal tube inlet valve 8 and opening the water outlet valve 10, the water pumped by the water pump 7 can directly reach the main water outlet pipe 4 at the temperature modification component without passing through any wound metal tubes 5, thereby minimizing heat loss.

[0047] Specifically, this embodiment is configured with multiple microchannel reactors 2 connected in sequence, and the microchannel reactors 2 are independently temperature controlled by temperature modification components corresponding to the microchannel reactors 2, so as to ensure that the system has multiple temperature zones and that each microchannel reactor can be at its required reaction temperature, thereby ensuring that the reaction proceeds efficiently. Before or in the early stages of the reaction, hot water from tank 1 can enter the temperature modification component and pass through the winding metal tube 5 with minimal or no heat loss, allowing it to enter the water bath of the corresponding microchannel reactor 2 at a higher temperature. This heats the microchannel tubing 21 of the microchannel reactor 2, enabling it to reach the required reaction temperature quickly and ensuring efficient reaction. After the reaction proceeds normally, if the microchannel tubing 21 is undergoing an exothermic reaction, the hot water from tank 1 can enter the temperature modification component and pass through the winding metal tube 5 with more heat loss, allowing it to enter the water bath of the microchannel reactor 2 at a lower temperature. This removes heat from the microchannel tubing 21, ensuring the microchannel reactor 2 maintains the optimal temperature even during an exothermic reaction, significantly improving reaction efficiency and avoiding safety hazards caused by temperature spikes due to excessive heat release during the reaction, thus ensuring reaction safety. In addition, most of the reactions in the microchannel reactor 2 are exothermic. Each microchannel reactor 2 is put into use and reacts sequentially. The heat generated during the reaction of the previous microchannel reactor 2 is carried away by the water in the water bath and returned to the water tank 1 through the return water pipe 13. Therefore, the heat generated in the previous microchannel reactor 2 can be used to heat the next microchannel reactor 2 before or at the beginning of the reaction, thereby saving energy. In addition, the water in the water tank 1 is recycled. Therefore, the operating cost of the whole device is low and it is easy to promote and use.

[0048] In addition, in this embodiment, the water tank 1, each main water outlet pipe 4, and each microchannel reactor 2 are equipped with temperature sensors, and each valve is an electric valve. The controller is connected to the heating element 29, each temperature sensor, and each electric valve. It controls the operation of the heating element 29 according to the temperature feedback from the corresponding temperature sensor, and determines the number of wound metal tubes 5 put into use in each temperature modification component. Based on the number of wound metal tubes 5 put into use, it controls the opening and closing of each electric valve.

[0049] The more spiral metal tubes 5 used, the larger the surface area in contact with the heat-conducting pillars 3, and the greater the temperature reduction. Figure 1 , Figure 2 In the example shown, three temperature modification components and three microchannel reactors 2 are configured. The inlet valve 8 of the metal tube at the upper opening of the wound metal tube 5 is located above the outlet valve 10. Taking one temperature modification component as an example: if only one wound metal tube 5 needs to be used, the outlet valve 10 at the upper opening of the bottom wound metal tube 5 will be opened, and the inlet valve 8 between the bottom wound metal tube 5 and the wound metal tube 5 above it will be closed. If two wound metal tubes 5 need to be used, for the first wound metal tube 5 from bottom to top, the outlet valve 10 at its upper opening will be closed, and the inlet valve 8 at its upper opening will be opened. For the second wound metal tube from bottom to top, the outlet valve 10 at its upper opening will be opened, and the inlet valve 8 at its upper opening will be closed.

[0050] In this embodiment, as Figure 2 and Figure 3 As shown, the heat-conducting pillars 3 can be stacked sequentially from bottom to top, with heat insulation plates 22 arranged between adjacent heat-conducting pillars 3.

[0051] This setup saves floor space and minimizes heat transfer and temperature interference between adjacent heat-conducting columns, thus allowing for more precise control of the water temperature in each main outlet pipe 4.

[0052] In this embodiment, as Figure 1 , Figure 2 and Figure 6 As shown, the microchannel reactors 2 are arranged sequentially in the vertical direction. In two adjacent microchannel reactors 2, the lower opening of the upper microchannel pipe 21 is connected to the upper opening of the lower microchannel pipe 21 through the drain pipe 11.

[0053] This setup saves floor space and facilitates the transfer of materials between adjacent microchannel reactors 2. The products from the previous microchannel reactor 2 can more smoothly enter the next microchannel reactor 2 and participate in the reaction as reactants.

[0054] In this embodiment, as Figure 2 , Figure 6 and Figure 7 As shown, the upper opening of the uppermost microchannel tube 21 and the drain tube 11 are respectively connected to the inlet tube 23, or each microchannel tube 21 is respectively connected to the inlet tube.

[0055] The liquid inlet pipe 23 is equipped with a liquid inlet valve 24.

[0056] In this way, reactants, catalysts, etc. can be easily added into the microchannels 21 as needed.

[0057] In this embodiment, as Figure 1 , Figure 2 and Figure 6 As shown, the lower end of the microchannel tube 21 is connected to a final drain pipe 25, and the final drain pipe 25 is equipped with a final drain valve 26.

[0058] This makes it easier to remove the final reaction products.

[0059] In this embodiment, as Figure 1 , Figure 2 and Figure 8 As shown, the continuous microchannel reaction system with multiple temperature zones also includes a water pump mounting box 27. The water pump mounting box has multiple layers, with one water pump 7 installed on each layer, and each layer is provided with an air vent 28.

[0060] This facilitates the orderly installation and arrangement of multiple water pumps 7, and enables rapid heat dissipation.

[0061] Example 2

[0062] Based on Example 1, such as Figure 2 As shown, the water tank 1 is fixedly connected from left to right by a first partition 14 and a second partition 15, dividing the water tank 1 into a heating zone 16, a water flow zone 17, and a water outlet zone 18 from left to right; wherein,

[0063] The upper end of the first partition 14 is connected to the water tank 1, and there is a gap between the lower end and the water tank 1; the lower end of the second partition 15 is connected to the water tank 1, and there is a gap between the upper end and the water tank 1.

[0064] The heating element 29 is installed in the heating zone 16, the inlet pipe 6 is directly connected to the outlet water zone 18, and the return water pipe 13 is directly connected to the heating zone 16.

[0065] Specifically, the water in the water tank 1 flows through the S-shaped self-heating zone 16 to the water passage zone 17 and the water outlet zone in sequence, and finally enters the water inlet pipe 6. This ensures that the water temperature entering the water inlet pipe 6 is stable, and also helps to block impurities and sediments in the water tank 1 to a certain extent, thus preventing blockage of the water bath layer of the metal pipe 5 and the microchannel reactor 2.

[0066] Example 3

[0067] Based on Example 1 or Example 2, such as Figure 2 , Figure 3 and Figure 4 As shown, each temperature modification component also includes a temperature modification component mounting box 19 and a heat exchange plate 20. A heat-conducting column 3 is installed inside the temperature modification component mounting box 19, and the heat exchange plate 20 is installed on the corresponding heat-conducting column 3. The portion extending out of the temperature modification component mounting box 19 is equipped with heat dissipation fins 200. Additionally, a heat insulation plate 22 can be installed between the top of the uppermost heat-conducting column 3 and the temperature modification component mounting box 19 to reduce heat transfer between the heat-conducting column 3 and the temperature modification component mounting box 19.

[0068] Specifically, the temperature modification component installation box 19 is set up to ensure that each temperature modification component is arranged and installed in an orderly manner. On the other hand, it can play an isolation role, transferring the heat on the heat-conducting column 3 to the outside of the temperature modification component installation box 19 through the heat exchange plate 20 and heat dissipation fins 200, thereby preventing the heat emitted by the heat-conducting column 3 from affecting the temperature of the wound metal tube 5 in turn.

[0069] In addition, a heat recovery device or a heat storage device can be installed outside the temperature modification component placement box 19. This heat can be used to heat the next microchannel reactor 2 or to evaporate and purify the final product, further saving energy consumption.

[0070] Example 4

[0071] A method for temperature control of a continuous microchannel reaction system with multiple temperature zones, based on Embodiment 1, Embodiment 2, or Embodiment 3, comprising:

[0072] The reactants react sequentially in the microchannels 21 of each microchannel reactor 2, and the product in the previous microchannel is used as the reactant in the next microchannel 21.

[0073] Adjust the opening and closing status of the inlet valve 8 and outlet valve 10 of each metal pipe on the corresponding temperature modification component so that the water in the water tank 1 enters the water bath layer of the corresponding microchannel reactor 2 after being pumped by the corresponding water pump 7 through the corresponding number of wound metal pipes 5, and adjust the temperature in the corresponding microchannel pipeline 21.

[0074] For each microchannel reactor 2:

[0075] Before the reaction begins and / or in the early stage of the reaction, the water in the water tank 1 is pumped by the corresponding water pump 7 through a small number of wound metal tubes 5 and then enters the water bath of the microchannel reactor 2 to heat the microchannel pipeline 21 to the preset reaction temperature.

[0076] If an exothermic reaction occurs within the microchannel pipeline 21, the water in the water tank 1 is pumped by the corresponding water pump 7 through a large number of wound metal tubes 5 before entering the water bath layer of the microchannel reactor 2, thereby maintaining the preset reaction temperature in the microchannel pipeline 21.

[0077] It should be noted that if the microchannel reaction pipeline 21 still needs to be heated during the normal reaction process, the water in the water tank 1 can be pumped by the corresponding water pump 7 through a small number of wound metal tubes 5 (which can be zero) before entering the water bath of the microchannel reactor 2 to heat the microchannel reaction pipeline 21.

[0078] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A continuous microchannel reaction system with multiple temperature zones, characterized in that, The system includes a water tank (1), multiple temperature modification components, and multiple microchannel reactors (2). The water tank (1) is equipped with a heating element (29), and each microchannel reactor (2) corresponds to one temperature modification component. Each temperature control component includes a heat-conducting column (3), a main water outlet pipe (4), and multiple wound metal tubes (5). The multiple wound metal tubes (5) are wound sequentially around the heat-conducting column (3) from bottom to top. The lower end opening of the lowest wound metal tube (5) is connected to the water tank (1) through a water pump (7). Adjacent wound metal tubes (5) are connected through metal tube inlet valves (8). The upper end opening of each wound metal tube (5) is also connected to the main water outlet pipe (4) through a water outlet valve (10). The microchannel pipelines (21) of each microchannel reactor (2) are connected in sequence through the drain valve (12); the water inlet of the water bath layer of each microchannel reactor (2) is connected to the water outlet main pipe (4) of the corresponding temperature modification component, and the water outlet is connected to the water tank (1) through the return water pipe (13). The temperature modification component is configured to adjust the water temperature held in the water bath of the corresponding microchannel reactor (2) through the main outlet pipe (4) by adjusting the number of the wound metal tubes (5) it is put into use, so as to heat or dissipate heat to the corresponding microchannel pipeline (21).

2. The continuous microchannel reaction system with multiple temperature zones according to claim 1, characterized in that, The water tank (1) is fixedly connected from left to right by a first partition (14) and a second partition (15), dividing the water tank (1) into a heating zone (16), a water flow zone (17), and a water outlet zone (18) from left to right; wherein, The upper end of the first partition (14) is connected to the water tank (1), and there is a gap between the lower end and the water tank (1); the lower end of the second partition (15) is connected to the water tank (1), and there is a gap between the upper end and the water tank (1); The heating element (29) is installed in the heating zone (16). The lower end opening of the bottom winding metal tube (5) of each temperature modification component is directly connected to the water outlet zone (18) through the water inlet pipe (6) configured with the water pump (7). The return water pipe (13) is directly connected to the heating zone (16).

3. The continuous microchannel reaction system with multiple temperature zones according to claim 1, characterized in that, Each temperature modification component also includes a temperature modification component mounting box (19) and a heat exchange plate (20). The heat-conducting column (3) is installed inside the temperature modification component mounting box (19), and the heat exchange plate (20) is installed on the corresponding heat-conducting column (3). The portion extending out of the temperature modification component mounting box (19) is equipped with heat dissipation fins (200).

4. The continuous microchannel reaction system with multiple temperature zones according to claim 1, characterized in that, Each heat-conducting column (3) is stacked sequentially from bottom to top, and a heat insulation plate (22) is arranged between adjacent heat-conducting columns (3).

5. The continuous microchannel reaction system with multiple temperature zones according to claim 1, characterized in that, Each microchannel reactor (2) is arranged in a vertical direction. In two adjacent microchannel reactors (2), the lower end opening of the upper microchannel pipeline (21) is connected to the upper end opening of the lower microchannel pipeline (21) through a drain pipe (11) equipped with the drain valve (12).

6. The continuous microchannel reaction system with multiple temperature zones according to claim 5, characterized in that, The upper opening of the uppermost microchannel tube (21) and the drain tube (11) are respectively connected to the inlet tube (23), or the upper opening of each microchannel tube (21) is respectively connected to the inlet tube; The liquid inlet pipe (23) is equipped with a liquid inlet valve (24).

7. The continuous microchannel reaction system with multiple temperature zones according to claim 5, characterized in that, The lower end of the microchannel tube (21) is connected to a final drain pipe (25), which is equipped with a final drain valve (26).

8. The continuous microchannel reaction system with multiple temperature zones according to claim 1, characterized in that, It also includes a water pump mounting box (27), which has multiple layers, with one water pump (7) installed on each layer, and each layer is provided with a vent (28).

9. A method for temperature control of a continuous microchannel reaction system with multiple temperature zones based on any one of claims 1-8, characterized in that, The methods include: The reactants react sequentially in the microchannels (21) of each microchannel reactor (2), and the product in the previous microchannel (21) is used as the reactant in the next microchannel (21); Adjust the opening and closing status of the inlet valve (8) and outlet valve (10) of each metal pipe on the corresponding temperature modification component so that the water in the water tank (1) enters the water bath layer of the corresponding microchannel reactor (2) after passing through the corresponding number of wound metal pipes (5) under the pumping of the corresponding water pump (7), and adjust the temperature in the corresponding microchannel pipeline (21). For each microchannel reactor (2): Before the reaction begins and / or at the initial stage of the reaction, the water in the tank (1) is pumped by the corresponding water pump (7) through a small number of wound metal tubes (5) and then enters the water bath of the microchannel reactor (2) to heat the microchannel pipeline (21) to the preset reaction temperature. If an exothermic reaction occurs inside the microchannel pipeline (21), the water in the water tank (1) will be pumped by the corresponding water pump (7) through a large number of wound metal tubes (5) and then enter the water bath of the microchannel reactor (2), so that the microchannel pipeline (21) maintains the preset reaction temperature.

Images