Tubular mixed reaction device

Abstract

The utility model provides a tubular mixed reaction device, which belongs to the technical field of chemical reaction equipment and comprises an S-shaped pipeline structure formed by detachably connecting a linear reaction tube and a U-shaped reaction tube at intervals, and a jacket is sleeved on the outer side of the linear reaction tube; a coaxial inner tube is also arranged in the linear reaction tube; a mixing pipeline is arranged at an inlet of the S-shaped pipeline structure, and at least one mixing pipeline is arranged in the S-shaped pipeline structure; the mixing pipeline comprises a plurality of shunting section pipelines and converging section pipelines which are communicated at intervals; the shunting section pipeline comprises a first shunting pipe and a second shunting pipe which are arranged side by side; the confluence section pipeline comprises a confluence pipe; the first section and the last section of the mixing pipeline at the inlet of the S-shaped pipeline structure are confluence section pipelines; the first section of the mixing pipeline in the S-shaped pipeline structure is a shunting section pipeline, and the last section of the mixing pipeline is a converging section pipeline. The device does not need power stirring equipment, is good in mixing effect and heat transfer effect, does not form a flowing dead zone or a reaction dead zone, and is high in reaction efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical reaction equipment, in particular to a tubular mixing reaction device. Background Art

[0002] A tubular reactor is a continuously operated reactor with a tubular shape and a large aspect ratio. It has the characteristics of small volume, large specific surface area, and high heat exchange efficiency. In addition, the tubular reactor can realize segmented temperature control operation, which is highly safe and very suitable for reactions with fast reaction rates and large thermal effects. In the context of increasingly stringent environmental supervision, for example, the production of K amine (short for 2-amino-5-chloro-N,3-dimethylbenzamide), a pharmaceutical intermediate, is increasingly using tubular reactors for continuous production in the process of transitioning to green and environmentally friendly directions, while abandoning traditional intermittent reactor production, which improves the production efficiency of the product, realizes continuous production, and can significantly save energy and reduce consumption.

[0003] When using a traditional tubular reactor, due to the small effective flow area of ​​the reaction pipeline and the long pipeline length, if a stirrer and other power equipment are configured, the energy consumption is high and the required quantity is large. Therefore, the reaction raw materials often cannot achieve a good mixing effect in the pipeline, and the mixing efficiency and quality are not high enough, which may lead to the formation of flow dead zones or reaction dead zones in the pipeline, thereby affecting the reaction process and reaction efficiency. At the same time, the contact area between the reaction pipeline and the heat exchange medium in the tubular reactor is limited, which may easily lead to poor reaction effect of the reaction raw materials in the reactor, affecting normal production. For this reason, it is necessary to provide a tubular mixing reaction device with strong mixing and strong heat exchange to solve the above problems. Utility Model Content

[0004] The utility model provides a tubular mixing reaction device, which is used to solve the problem in the prior art that the mixing effect and heat transfer effect are not good and thus the production efficiency is affected.

[0005] The utility model provides a tubular mixing reaction device, comprising: an S-shaped pipeline structure formed by detachably connecting a plurality of linear reaction tubes and a plurality of U-shaped reaction tubes, wherein a jacket is provided on the outer side of each linear reaction tube; a coaxial inner tube is also provided in each linear reaction tube, the two ends of the inner tube are sealed, and an inner tube inlet and an inner tube outlet which penetrate the linear reaction tube and the jacket are connected on the side wall; a mixing pipeline is provided at the inlet of the S-shaped pipeline structure, and at least one mixing pipeline is provided in the S-shaped pipeline structure.

[0006] Furthermore, the mixing pipe includes a plurality of sections of diversion section pipes and converging section pipes that are connected at intervals; the diversion section pipe includes a first diversion pipe and a second diversion pipe arranged side by side, the inlet sides of the first diversion pipe and the second diversion pipe are connected to each other to form a diversion inlet, and the outlet sides are respectively provided with a first diversion outlet and a second diversion outlet; the converging section pipe includes a converging pipe, the inlet side of the converging pipe is provided with a first converging inlet and a second converging inlet, and the outlet side of the converging pipe is provided with a converging outlet; the first section and the last section of the mixing pipe at the inlet of the S-shaped pipe structure are both converging section pipes; the first section of the mixing pipe in the S-shaped pipe structure is a diversion section pipe, and the last section is a converging section pipe.

[0007] Furthermore, a first feed pipe and a second feed pipe are provided at the inlet of the S-shaped pipeline structure, the first feed pipe is connected to the first confluence inlet of the first confluence section pipeline, and the second feed pipe is connected to the second confluence inlet of the confluence section pipeline; the confluence outlet of the last confluence section pipeline is connected to the inlet of the S-shaped pipeline structure.

[0008] Furthermore, a circumferentially wound spiral blade is provided on the outer wall of the inner tube along the axial extension, and the spiral blade is inclinedly provided on the inner tube.

[0009] Furthermore, a circumferentially wound spiral baffle is axially extended between the outer wall of each linear reaction tube and the inner wall of the jacket.

[0010] Furthermore, the confluence pipe includes a sleeve and a center pipe, and the center pipe is coaxially arranged inside the sleeve; a first confluence inlet is provided on the inlet side of the center pipe, and a second confluence inlet is provided on the inlet side of the sleeve; the outlet side of the center pipe is a confluence outlet, and the outlet side of the sleeve is sealed and connected to the outer wall of the center pipe; a plurality of connecting channels are evenly spaced radially on the tube wall of the center pipe, and the plurality of connecting channels connect the center pipe and the sleeve.

[0011] Furthermore, each connecting channel is arranged obliquely in the tube wall of the central tube, and the inclination direction of the connecting channel is the same as the material flow direction in the central tube; the angle between the extension direction of each connecting channel and the length direction of the central tube is less than or equal to 45°.

[0012] Furthermore, the cross-sectional dimension of the central tube gradually increases in a direction away from the first confluence inlet to form an expanded diameter structure.

[0013] Furthermore, a cooling interlayer is provided on the outside of the mixing pipe, and the cooling interlayer is used to pass a heat exchange medium to exchange heat with the material in the mixing pipe.

[0014] Furthermore, thermometers and pressure gauges are provided in the linear reaction tube and the U-shaped reaction tube in the S-shaped pipeline structure.

[0015] The tubular mixed reaction device provided by the utility model has high mass transfer efficiency and fast heat transfer rate, can realize continuous operation of feeding and discharging, has high operation efficiency, good material stability and high yield. In the S-shaped pipeline structure, the inner tube and the jacket are used to perform double-sided heat exchange on the reaction materials at the same time, and the spiral blades and spiral baffles are used to accelerate the mixing of the heat exchange medium and the materials in the radial direction, thereby accelerating the transfer of reaction heat, improving the heat exchange rate and the stability of the industrial production process, which is conducive to enhancing the heat exchange effect of the materials and realizing accurate temperature control of the reaction, ensuring the reaction effect of the reaction and the normal, safe and stable progress of the reaction.

[0016] The utility model uses the diversion section pipeline and the confluence section pipeline as the mixing pipeline of the material, and performs multiple continuous diversion and confluence of the material, which has a good static mixing effect, and can quickly complete the rapid mixing of the two materials without the aid of mechanical and electrical equipment such as stirring or ejectors, so that the material has high mixing efficiency and stable mixing effect during the flow, which is conducive to improving the reaction efficiency and reaction effect, and reducing the operating cost of the device. In addition, the mixing pipeline is suitable for the liquid-liquid two-phase or gas-liquid two-phase mixing process in the chemical industry, has good mixing effect, high mass transfer efficiency, and can obtain a higher reaction conversion rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a tubular mixing reaction device provided in one embodiment of the utility model;

[0019] Figure 2 A schematic diagram of the structure of a mixing pipeline provided in one embodiment of the utility model;

[0020] Figure 3 A schematic diagram of the explosion structure of a linear reaction tube provided in one embodiment of the utility model;

[0021] Figure 4 This is a schematic structural diagram of a confluence pipe provided in one embodiment of the utility model.

[0022] Description of reference numerals:

[0023] 1-S-shaped pipeline structure, 2-mixing pipeline, 11-straight reaction tube, 12-U-shaped reaction tube, 13-jacket, 14-inner tube, 15-first feed tube, 16-second feed tube, 17-spiral blades, 18-spiral baffles, 21-diverter section pipeline, 22-merging section pipeline, 23-cooling interlayer, 141-inner tube inlet, 142-inner tube outlet, 211-first diverter tube, 212-second diverter tube, 213-diverter inlet, 214-first diverter outlet, 215-second diverter outlet, 221-merging tube, 222-first merge inlet, 223-second merge inlet, 224-merging outlet, 225-sleeve, 226-center tube, 227-connecting channel. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the utility model.

[0025] like Figure 1 and Figure 2 The utility model provides a tubular mixing reaction device, comprising: an S-shaped pipeline structure 1 formed by a plurality of straight reaction tubes 11 and a plurality of U-shaped reaction tubes 12 connected in a detachable manner at intervals, wherein a jacket 13 is provided on the outer side of each straight reaction tube 11; a coaxial inner tube 14 is also provided in each straight reaction tube 11, the two ends of the inner tube 14 are sealed, and an inner tube inlet 141 and an inner tube outlet 142 that penetrate the straight reaction tube 11 and the jacket 13 are connected on the side wall; a mixing pipeline 2 is provided at the inlet of the S-shaped pipeline structure 1, and at least one mixing pipeline 2 is provided in the S-shaped pipeline structure 1.

[0026] Optionally, the mixing pipe 2 includes a plurality of sections of diversion section pipes 21 and converging section pipes 22 that are connected at intervals; the diversion section pipe 21 includes a first diversion pipe 211 and a second diversion pipe 212 arranged side by side, the inlet sides of the first diversion pipe 211 and the second diversion pipe 212 are connected to each other to form a diversion inlet 213, and the outlet sides are respectively provided with a first diversion outlet 214 and a second diversion outlet 215; the converging section pipe 22 includes a converging pipe 221, the inlet side of the converging pipe 221 is provided with a first converging inlet 222 and a second converging inlet 223, and the outlet side of the converging pipe 221 is provided with a converging outlet 224; the first section and the last section of the mixing pipe 2 at the inlet of the S-shaped pipe structure 1 are both the converging section pipe 22; the first section of the mixing pipe 2 in the S-shaped pipe structure 1 is the diversion section pipe 21, and the last section is the converging section pipe 22.

[0027] When using the device, the heat exchange medium (which can be a heating medium or a cooling medium) required for the reaction is first fed into the jacket 13 and the inner tube 14, and then the reaction materials are fed into the confluence section pipe 22 of the mixing pipe 2 at the entrance of the S-shaped pipe structure 1. The reaction materials are merged and mixed in the confluence pipe 221, and then flow through the confluence outlet 224 into the next diversion section pipe 21, and after passing through the diversion inlet 213 of the diversion section pipe 21, they are forked and guided by the first diversion pipe 211 and the second diversion pipe 212, and are diverted into two streams of materials, and then pass through the first diversion outlet 214 and the second diversion outlet 215, and then enter the confluence pipe 221 through the first confluence inlet 222 and the second confluence inlet 223 of the confluence section pipe 22. After continuous diversion and reflux in the mixing pipe 2, the materials are finally uniformly discharged from the last confluence section pipe 22 into the first linear reaction tube 11 or the U-shaped reaction tube 12 of the S-shaped pipe structure 1. The reaction materials flow and react in the S-shaped pipeline structure 1. During this period, the heat exchange medium is continuously introduced into the jacket 13 and the inner tube 14 to regulate the temperature and reaction heat of the reaction materials. After a period of reaction, the reaction materials are newly divided and merged through the mixing pipeline 2 set in the S-shaped pipeline structure 1 to change the flow inertia of the materials and enhance the mixing effect. After the materials pass through the mixing pipeline 2, they enter the S-shaped pipeline structure 1 again for reaction and heat exchange. When the materials flow and react in the S-shaped pipeline structure 1, multiple mixing pipelines 2 can be used for remixing to enhance the mixing and reaction effects. Until the reaction is completed, the materials are discharged from the outlet of the S-shaped pipeline structure 1.

[0028] The detachably connected linear reaction tube 11 and U-shaped reaction tube 12 can be quickly assembled and put into production, and are convenient for maintenance and cleaning, which is conducive to shortening maintenance time and work costs. By arranging the inner tube 14 of the inner layer and the jacket 13 of the outer layer in the linear reaction tube 11, the material is subjected to double-sided heat exchange when reacting in the linear reaction tube 11, which is conducive to enhancing the heat exchange effect of the material in the S-shaped pipeline structure 1 as a reaction pipeline, improving the mass transfer efficiency between materials, and helping to achieve accurate temperature control of the reaction, ensuring the reaction effect of the reaction and the normal, safe and stable progress of the reaction.

[0029] The diversion section pipe 21 in the mixing pipe 2 is connected between two adjacent converging section pipes 22. After the materials are mixed in the converging section pipe 22, they are forked and guided through the first diversion pipe 211 and the second diversion pipe 212 of the diversion section pipe 21, and are diverted into two streams of materials, and then merged and mixed in the converging pipe 221 of the converging section pipe 22. The materials are continuously diverted and merged for many times, which has a good static mixing effect, and the two materials can be quickly mixed without the aid of mechanical and electrical equipment such as stirring or ejectors, so that the materials have high mixing efficiency and stable mixing effect during flow, which is beneficial to improving reaction efficiency and reaction effect, and reducing the operating cost of the device.

[0030] like Figure 2 Optionally, the inlet of the S-shaped pipeline structure 1 is further provided with a first feed pipe 15 and a second feed pipe 16, the first feed pipe 15 is connected to the first confluence inlet 222 of the first confluence section pipeline 22, and the second feed pipe 16 is connected to the second confluence inlet 223 of the confluence section pipeline 22; the confluence outlet 224 of the last confluence section pipeline 22 is connected to the inlet of the S-shaped pipeline structure 1. The device of the utility model usually has two parts of feed, and the materials are mixed and reacted after entering the S-shaped pipeline structure 1. According to the feed characteristics, the first feed pipe 15 and the second feed pipe 16 are respectively connected to the first confluence inlet 222 and the second confluence inlet 223, so that the materials are mixed to a greater extent in the mixing pipeline 2, and the improved mixing effect is conducive to the improvement of the later reaction efficiency and reaction effect.

[0031] like Figure 3 Optionally, a circumferentially wound spiral blade 17 is provided on the outer wall of the inner tube 14 along the axial extension, and the spiral blade 17 is obliquely arranged on the inner tube 14. The spiral blade 17 can make the material bend and change direction in the linear reaction tube 11, increase the flow path of the reaction material, enhance the heat exchange effect between the heat exchange medium in the inner tube 14 and the material in the linear reaction tube 11, and make the material conduct and mix better during the flow, accelerate the mixing of the material in the radial direction, and at the same time, it is not easy to form a flow dead zone and a heat exchange dead zone, further ensure the reaction efficiency between the reaction materials, and improve the heat exchange rate and the stability of the industrial production process.

[0032] Optionally, a circumferentially wound spiral baffle 18 is provided between the outer wall of each linear reaction tube 11 and the inner wall of the jacket 13 along the axial extension. The spiral baffle 18 allows the heat exchange medium to flow in the jacket 13 in a spiral direction along the spiral direction of the spiral baffle 18, so that the heat exchange medium is not easy to form a laminar flow in the jacket 13, so that the heat exchange medium at different parts continuously exchanges heat with the outer wall of the linear reaction tube 11 and the material inside, accelerates the transfer of reaction heat, and enhances the heat exchange effect and temperature control effect.

[0033] like Figure 4Optionally, the confluence pipe 221 includes a sleeve 225 and a center pipe 226, and the center pipe 226 is coaxially arranged inside the sleeve 225; a first confluence inlet 222 is provided on the inlet side of the center pipe 226, and a second confluence inlet 223 is provided on the inlet side of the sleeve 225; the outlet side of the center pipe 226 is a confluence outlet 224, and the outlet side of the sleeve 225 is sealed and connected to the outer wall of the center pipe 226; a plurality of connecting channels 227 are evenly spaced radially on the tube wall of the center pipe 226, and the plurality of connecting channels 227 connect the center pipe 226 and the sleeve 225. The materials from the diversion section pipeline 21 enter the central pipe 226 and the sleeve 225 respectively. The materials in the sleeve 225 then enter the central pipe 226 through the connecting channel 227, merge and mix with the materials in the central pipe 226 in multiple directions, and the materials diverted in the diversion section pipeline 21 are remixed through the converging pipe 221, which changes the flow state of the materials in the central pipe 226, so that the materials dispersed in different pipelines can be continuously mixed, which is beneficial to improving the mixing degree of the materials during flow and the subsequent reaction effect when entering the S-shaped pipeline structure 1.

[0034] Optionally, each connecting channel 227 is arranged obliquely in the tube wall of the central tube 226, and the oblique direction of the connecting channel 227 is the same as the material flow direction in the central tube 226; the angle between the extension direction of each connecting channel 227 and the length direction of the central tube 226 is less than or equal to 45°. The flow direction of the material in the sleeve 225 in the connecting channel 227 is the same as the flow direction of the material in the central tube 226. When the material in the sleeve 225 enters the central tube 226, the material flow state is disturbed to a certain extent, and the mixing effect is increased, but at the same time, it is also ensured that the flow velocity of the material in the central tube 226 fluctuates less and is relatively stable, and does not affect the smooth progress of the subsequent reaction.

[0035] Optionally, the cross-sectional size of the central tube 226 gradually increases in the direction away from the first confluence inlet 222 to form an expanded diameter structure. The central tube 226 with an expanded diameter structure makes the flow rate of the material slow down as the diameter of the central tube 226 increases after the material enters from the first confluence inlet 222, and the material is more likely to generate negative pressure in the central tube 226 when flowing, so that the material in the sleeve 225 is more likely to enter the central tube 226 through the connecting channel 227 for mixing, thereby accelerating the mixing efficiency of the material in the confluence pipe 221.

[0036] like Figure 2 Optionally, a cooling interlayer 23 is further provided on the outside of the mixing pipe 2, and the cooling interlayer 23 is used to pass a heat exchange medium to exchange heat with the material in the mixing pipe 2. The cooling interlayer 23 is provided with an interlayer inlet and an interlayer outlet, and the heat exchange medium passed into the interlayer can ensure that the material does not experience a sudden drop or rise in temperature when in the mixing pipe 2, which is conducive to maintaining a stable temperature of the reaction system and ensuring a stable reaction effect.

[0037] Optionally, a thermometer and a pressure gauge (not shown in the drawings) are provided in the linear reaction tube 11 and the U-shaped reaction tube 12 in the S-shaped pipeline structure 1. The thermometer and the pressure gauge are used to monitor the temperature and pressure of the materials in the corresponding pipe section in real time, and a pressure regulating valve and a safety valve can be provided to adjust the pressure of the reaction system and automatically release the pressure to ensure the safety of the reaction system.

[0038] It should be noted that the number and order of the straight reaction tubes 11 and U-shaped reaction tubes 12 in the device can be selected by technicians in this field according to production conditions; the number of the converging section pipes 22 and the diverting section pipes 21 at the inlet of the S-shaped pipe structure 1 and in the internal mixing pipe 2 can be selected by technicians in this field according to production conditions; the jacket 13 is provided with a jacket 13 inlet and a jacket 13 outlet, and the heat exchange medium in the jacket 13 and the inner tube 14 can be heat transfer oil, water, coolant or circulating water, which can be selected by technicians in this field according to the reaction conditions; the first diverter pipe 211 and the second diverter pipe 212 can be arc-shaped pipes, or they can be zigzag pipes formed by connecting straight pipes in series; in the utility model, there is no special limitation on this.

[0039] The tubular mixing reaction device of the utility model is specifically operated by first feeding the heat exchange medium required for the reaction into the jacket 13 and the inner tube 14, and then, according to the feeding characteristics, the first feeding pipe 15 and the second feeding pipe 16 are respectively connected to the first confluence inlet 222 and the second confluence inlet 223 of the confluence section pipe 22 of the mixing pipe 2 at the inlet of the S-shaped pipe structure 1, and the materials respectively enter the central pipe 226 and the sleeve 225 of the confluence pipe 221, and the materials in the sleeve 225 enter the central pipe 226 through the connecting channel 227, and merge and mix with the materials in the central pipe 226 in multiple directions, and then flow through the confluence outlet 224 into the next section of the branch section pipe 21.

[0040] After the material enters through the diversion inlet 213 of the diversion section pipeline 21, it is forked and guided by the first diversion pipe 211 and the second diversion pipe 212, and is diverted into two streams of material, passes through the first diversion outlet 214 and the second diversion outlet 215, and then enters the converging pipe 221 through the first converging inlet 222 and the second converging inlet 223 of the converging section pipeline 22. After continuous diversion and reflux in the mixing pipe 2, the material is finally uniformly discharged from the last converging section pipeline 22 into the first straight reaction tube 11 or the U-shaped reaction tube 12 of the S-shaped pipeline structure 1. The reaction material flows and reacts in the straight reaction tube 11 and the U-shaped reaction tube 12 of the S-shaped pipeline structure 1. During this period, the heat exchange medium is continuously introduced into the jacket 13 and the inner tube 14 to regulate the temperature and reaction heat of the reaction material. The spiral blades 17 wound on the outer wall of the inner tube 14 can cause the material to be deflected and changed in direction in the linear reaction tube 11, and the spiral deflectors 18 in the jacket 13 cause the heat exchange medium to flow in a spiral direction, thereby enhancing the heat exchange effect between the jacket 13 and the inner tube 14.

[0041] After a period of reaction, the reaction materials are newly divided and merged through the mixing pipe 2 arranged in the S-shaped pipe structure 1 to enhance the mixing effect. After passing through the mixing pipe 2, the materials enter the S-shaped pipe structure 1 again for reaction and heat exchange. When the materials flow and react in the S-shaped pipe structure 1, multiple mixing pipes 2 can be used for remixing to enhance the mixing and reaction effects. Until the reaction is completed, the materials are discharged from the outlet of the S-shaped pipe structure 1.

[0042] At the same time, a cooling interlayer 23 is also provided on the outside of the mixing pipe 2, and an interlayer inlet and an interlayer outlet are provided on the cooling interlayer 23, which are used to pass a heat exchange medium to exchange heat with the material in the mixing pipe 2. In addition, a thermometer and a pressure gauge are provided in the S-shaped pipe structure 1 for real-time monitoring of the temperature and pressure of the material in the corresponding pipe section, and a pressure regulating valve and a safety valve can be provided to adjust the pressure of the reaction system.

[0043] Finally, it should be noted that the detailed structure of some equipment is not described in detail, but belongs to the prior art known to those skilled in the art, so it will not be repeated here. The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it; although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the field should understand that it is still possible to modify the technical solutions recorded in the above embodiments, or to replace some or all of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A tubular mixing reaction device, characterized in that: include: An S-shaped pipeline structure formed by detachably connecting a plurality of linear reaction tubes and a plurality of U-shaped reaction tubes, wherein a jacket is provided on the outer side of each linear reaction tube; a coaxial inner tube is also provided in each linear reaction tube, the two ends of the inner tube are sealed, and an inner tube inlet and an inner tube outlet are connected on the side wall and penetrate the linear reaction tube and the jacket; a mixing pipeline is provided at the inlet of the S-shaped pipeline structure, and at least one mixing pipeline is provided in the S-shaped pipeline structure; The mixing pipe includes a plurality of sections of diversion section pipes and confluence section pipes that are connected at intervals; the diversion section pipe includes a first diversion pipe and a second diversion pipe arranged side by side, the inlet sides of the first diversion pipe and the second diversion pipe are connected to each other to form a diversion inlet, and the outlet sides are respectively provided with a first diversion outlet and a second diversion outlet; the confluence section pipe includes a confluence pipe, the inlet side of the confluence pipe is provided with a first confluence inlet and a second confluence inlet, and the outlet side of the confluence pipe is provided with a confluence outlet; the first section and the last section of the mixing pipe at the inlet of the S-shaped pipe structure are both the confluence section pipe; the first section of the mixing pipe in the S-shaped pipe structure is the diversion section pipe, and the last section is the confluence section pipe.

2. The tubular mixing reaction device according to claim 1, characterized in that: A first feed pipe and a second feed pipe are also provided at the inlet of the S-shaped pipeline structure, wherein the first feed pipe is connected to the first confluence inlet of the first section of the confluence section pipeline, and the second feed pipe is connected to the second confluence inlet of the confluence section pipeline; the confluence outlet of the last section of the confluence section pipeline is connected to the inlet of the S-shaped pipeline structure.

3. The tubular mixing reaction device according to claim 1, characterized in that: A circumferentially wound spiral blade is arranged on the outer wall of the inner tube along an axial extension, and the spiral blade is arranged obliquely on the inner tube.

4. The tubular mixing reaction device according to claim 1, characterized in that: A circumferentially wound spiral baffle is axially extended between the outer wall of each linear reaction tube and the inner wall of the jacket.

5. The tubular mixing reaction device according to any one of claims 1 to 4, characterized in that: The confluence pipe includes a sleeve and a center pipe, and the center pipe is coaxially arranged inside the sleeve; a first confluence inlet is provided on the inlet side of the center pipe, and a second confluence inlet is provided on the inlet side of the sleeve; the outlet side of the center pipe is a confluence outlet, and the outlet side of the sleeve is sealed and connected to the outer wall of the center pipe; a plurality of connecting channels are evenly spaced radially on the tube wall of the center pipe, and the plurality of connecting channels connect the center pipe and the sleeve.

6. The tubular mixing reaction device according to claim 5, characterized in that: Each of the connecting channels is arranged obliquely in the tube wall of the central tube, and the inclination direction of the connecting channel is the same as the material flow direction in the central tube; the angle between the extension direction of each of the connecting channels and the length direction of the central tube is less than or equal to 45°.

7. The tubular mixing reaction device according to claim 5, characterized in that: The cross-sectional dimension of the central tube gradually increases in a direction away from the first confluence inlet to form an expanded diameter structure.

8. The tubular mixing reaction device according to claim 1, characterized in that: A cooling interlayer is also provided on the outside of the mixing pipe, and the cooling interlayer is used to pass a heat exchange medium so as to exchange heat with the material in the mixing pipe.

9. The tubular mixing reaction device according to claim 1, characterized in that: The linear reaction tube and the U-shaped reaction tube in the S-shaped pipeline structure are both provided with a thermometer and a pressure gauge.

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