Micro-channel jet reactor

Abstract

The invention discloses a micro-channel jet reactor. The micro-channel jet reactor comprises a sample introduction unit, a main mixing unit and a reaction unit which are sequentially communicated, the main mixing unit comprises a first inner pipe and a first outer pipe arranged outside the first inner pipe in a sleeving manner; a first annular space is formed between the first inner pipe and the first outer pipe; the sample introduction unit is communicated with the first inner pipe; a second sample inlet is formed in the first annular space, and a plurality of through holes are formed in the first inner pipe; the reaction unit comprises a second inner pipe and a second outer pipe arranged outside the second inner pipe in a sleeving manner; a second annular space is formed between the second inner pipe and the second outer pipe; the first inner pipe is communicated with the second inner pipe; during use, condensate is arranged in the second annular space. The reactor can effectively improve the mixing uniformity degree of reaction liquid, meanwhile, the reaction temperature is controlled, and the reaction rate and selectivity are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of microreactors and relates to a microchannel jet reactor. Background Art

[0002] In the chemical industry, traditional reaction equipment such as mixing kettles, reactors, extraction kettles, washing kettles, etc., when performing a mixed reaction of two fluids, due to the large size of the equipment, the flow and mixing of the fluids in the equipment are not sufficient, and there is uneven mixing. This will lead to incomplete reactions and affect the quality and yield of the products. Traditional reaction equipment is large in size, and requires more energy for heating or cooling. In addition, due to the relatively low heat transfer efficiency, the energy utilization rate is not high, resulting in a large amount of energy waste and increased production costs. With the continuous advancement of micro-machining technology, the ability to manufacture micro-sized structures has gradually improved, which provides technical support for the manufacture of microchannel reactors, enabling the construction of complex channel structures in a tiny space to achieve efficient fluid transmission and reaction control.

[0003] As an important process intensification technology, microchannel reactor can achieve efficient heat transfer, mass transfer and reaction in a small space, greatly improving the reaction rate and efficiency, which meets the development needs of process intensification. Microjet reactor is a device that uses the jet principle to intensify the mixing and reaction process. It mainly sprays fluid at high speed to produce strong shearing between different fluids, thereby achieving efficient mixing. The core working principle of the jet reactor is to form a high-speed jet of liquid or gas through a nozzle, thereby generating fine droplets or bubbles to carry out chemical reactions. However, for some high-precision multi-stage reactions, it is necessary to achieve high-precision control and a complex reaction system involving multiple reaction stages. This reaction system usually requires higher reaction efficiency, better mass transfer performance and higher reaction selectivity. Traditional jet reactors are not enough to meet the needs of the reaction. By studying new jet reactors to improve micro-mixing performance, gas-gas, gas-liquid, liquid-liquid mass transfer performance and reaction selectivity, it has become an effective way to meet the requirements of modern chemical production for product quality, production efficiency and environmental friendliness. In jet reactors, researchers have used a variety of means to improve the micro-mixing performance of materials. Among them, finely dispersing the fluid into the compartments within the microchannel and cleverly designing the geometric structure to shorten the diffusion path has become a widely recognized effective strategy. This design not only increases the contact area between fluids, but also promotes the rapid collision and mixing of fluid molecules, thereby significantly improving the mixing efficiency within the microchannel. In addition, a more uniform and efficient mixing effect can also be achieved by splitting and recombining the feed flow, or introducing elements with special microstructures to break the stable boundary layer of the laminar flow. However, in the process of using existing microjet reactors for reactions, the mixing of materials mainly relies on molecular diffusion and convective mixing under laminar flow conditions, and the mixing efficiency is relatively limited, the mixing is uneven, and the reaction selectivity is poor. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a microtube jet reaction system, thereby solving the technical problems that in the reaction process using the existing microjet reactor, material mixing mainly relies on molecular diffusion and convection mixing under laminar flow state, resulting in relatively limited mixing efficiency, uneven mixing and poor reaction selectivity.

[0005] The present invention is achieved through the following technical solutions: A microchannel jet reactor comprises a sampling unit, a main mixing unit and a reaction unit which are connected in sequence; The main mixing unit comprises a first inner tube and a first outer tube sleeved outside the first inner tube; a first annular gap is formed between the first inner tube and the first outer tube; the injection unit is connected to the first inner tube; a second injection port is provided on the first annular gap, and a plurality of through holes are provided on the first inner tube; The reaction unit comprises a second inner tube and a second outer tube sleeved outside the second inner tube; a second annular gap is formed between the second inner tube and the second outer tube; the first inner tube is connected to the second inner tube; When in use, condensate is arranged in the second annular gap.

[0006] Preferably, the injection unit comprises a plurality of first injection ports, a premixing chamber and a sample outlet; the premixing chamber is connected to the plurality of first injection ports and the sample outlet; the sample outlet is connected to the first inner tube.

[0007] Preferably, the injection unit comprises three injection ports, and the three injection ports and the outlet port are evenly spaced and arranged outside the premixing chamber.

[0008] Preferably, the plurality of through holes are evenly spaced apart along the axial direction and the circumferential direction of the first inner tube.

[0009] Preferably, the angle between the through hole and the outer wall of the first inner tube is 15°~65°.

[0010] Preferably, the inner diameter of the through hole is 0.1-5 mm.

[0011] Preferably, the distance of the first annular gap along the radial direction is 0.5-10 mm.

[0012] Preferably, the inner diameter of the first inner tube is 0.5-10 mm.

[0013] Preferably, a spoiler component is provided inside the second inner tube.

[0014] Preferably, the second outer tube is provided with a condensate inlet and a condensate outlet; the condensate inlet is arranged close to the liquid outlet of the second inner tube, and the condensate outlet is arranged away from the liquid outlet of the second inner tube.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The invention discloses a microchannel jet reactor, wherein a reaction liquid is inputted into the reactor through a sampling unit, another reaction liquid is inputted through a second sampling port arranged on a first annular gap, the reaction liquid inputted from the second sampling port enters the first inner tube through a plurality of through holes arranged on the first inner tube, and is mixed with the reaction liquid inputted through the sampling unit. In the process, the liquid entering the first inner tube through the through holes forms a jet effect when passing through the through holes, causing turbulent flow to the reaction liquid directly entering the first inner tube through the sampling unit, thereby achieving effective and sufficient mixing of multiple reaction liquids and effectively improving the mixing efficiency. Meanwhile, the reaction unit containing the second annular gap is provided to achieve temperature control in the reaction process, and effectively ensure the reaction rate and selectivity.

[0016] Furthermore, the injection unit includes a plurality of first injection ports, a premixing chamber and an outlet; the premixing chamber is connected to the plurality of first injection ports and outlets; the outlet is connected to the first inner tube. Firstly, the arrangement of the plurality of first injection ports allows for the introduction of different reaction liquids or additives simultaneously or sequentially. This design allows the various components to be preliminarily mixed in the premixing chamber, thereby reducing the difficulty and time of subsequent mixing. Secondly, the premixing chamber provides a relatively large space for the various components to be preliminarily mixed. In this space, due to the mutual collision and diffusion of the fluids, the various components can be more evenly distributed together. The design of the premixing chamber helps to reduce the eddies and dead corners generated by the fluid during the mixing process. These areas are often the source of uneven mixing. Through the premixing chamber, the fluid can be more fully stirred and mixed, thereby improving the overall mixing uniformity. Finally, the connection between the outlet and the first inner tube ensures that the mixed fluid can enter the main mixing unit continuously and stably. This design avoids the stagnation or backflow phenomenon that may occur before the fluid enters the main mixing unit, thereby ensuring the continuity of the mixing effect. Since the pre-mixing chamber has already preliminarily mixed the fluid, the degree of mixing of the fluid is relatively high when it enters the main mixing unit, which helps to reduce the workload of the main mixing unit and improve the overall mixing efficiency.

[0017] Furthermore, a plurality of the through holes are evenly spaced along the axial and circumferential directions of the first inner tube. First, the even distribution of the through holes in the axial direction helps the fluid to form a stable axial flow in the first inner tube. This flow pattern can ensure that the fluid is evenly distributed in the pipeline, reduce fluid retention and dead corners in the pipeline, and thus improve the mixing effect. The evenly distributed through holes in the axial direction can cause the fluid to be constantly disturbed during the flow process, thereby promoting the mixing between different components. This disturbance can accelerate the diffusion and exchange between the components and improve the mixing efficiency. In addition, the evenly distributed through holes in the circumferential direction can ensure that the fluid is evenly distributed on the pipeline cross section. This distribution pattern helps to reduce the deviation and eddy current phenomena of the fluid in the pipeline, thereby improving the uniformity of mixing. The evenly distributed through holes in the circumferential direction can cause the fluid to form turbulence in the pipeline. Turbulence is a highly irregular flow state that can promote mixing and exchange within the fluid. By increasing the turbulence of the fluid, the mixing effect can be further improved; through the combined effect of the through holes evenly distributed axially and circumferentially, the fluid can form a more uniform and stable flow state in the first inner tube, which helps to reduce the concentration gradient inside the fluid, thereby improving the uniformity of mixing. At the same time, the uniform distribution of through holes can reduce the local flow and scouring of the fluid in the pipeline, thereby reducing the risk of pipeline wear and leakage, which helps to enhance the stability and reliability of the system and extend the service life of the equipment.

[0018] Furthermore, the angle between the through hole and the outer wall of the first inner tube is 15°~65°. Firstly, the design of the angle enables the fluid ejected from the through hole to enter the first inner tube at a more appropriate angle, which is neither too vertical nor too parallel to the axis of the first inner tube, so that stronger disturbance and shear force can be formed in the fluid. The appropriate angle helps the fluid to maintain a certain speed and pressure when ejected, thereby enhancing the strength of the jet. This enhanced jet can better penetrate and disturb the fluid in the first inner tube and promote mixing; in addition, the design of the angle also takes into account the energy loss of the fluid during the ejection process. An angle that is too large may cause the fluid to encounter too much resistance when ejected, thereby losing energy, while an angle that is too small may prevent the fluid from fully expanding, which will also cause energy loss. The angle range of 15°~65° can reduce this energy loss to a certain extent and ensure the effectiveness of the jet; at the same time, the design of the angle helps to form turbulence in the first inner tube. Turbulence is a highly irregular flow state that can promote mixing and exchange within the fluid. By forming turbulence, the contact area between different components can be increased, thereby accelerating the mixing rate. Moreover, a suitable angle can ensure that the fluid is evenly distributed in the first inner tube and reduce mixing dead corners. Mixing dead corners refer to areas where fluids cannot fully contact and exchange during the mixing process. These areas often lead to uneven mixing. By reducing mixing dead corners, the uniformity of mixing can be further improved.

[0019] Furthermore, the inner diameter of the through hole is 0.1-5 mm. First, when the inner diameter of the through hole is within this range, it can be ensured that the fluid ejected from the through hole has sufficient speed and pressure to form an obvious jet effect. This jet effect can generate strong disturbance and shear force on the fluid in the first inner tube, thereby promoting mixing. The appropriate inner diameter of the through hole can enable the fluid to obtain sufficient kinetic energy when passing through the through hole. This kinetic energy helps the fluid to form a more uniform distribution in the first inner tube, while increasing the interaction force between the fluids and improving the mixing efficiency. In addition, the inner diameter of the through hole should not be too small, otherwise it will increase the resistance of the fluid passing through, resulting in energy loss. The inner diameter range of 0.1-5 mm can reduce unnecessary fluid resistance while ensuring the jet effect, so that the fluid can smoothly pass through the through hole and enter the first inner tube. At the same time, the appropriate inner diameter of the through hole can ensure that the fluid is evenly distributed in the first inner tube and reduce mixing dead corners. The inner diameter of the through hole of 0.1-5 mm can make the fluid more evenly distributed in the first inner tube, thereby reducing mixing dead corners.

[0020] Furthermore, the distance of the first annular gap in the radial direction is 0.5~10mm. Firstly, the radial distance of the first annular gap is within this range, so that the jet ejected from the through hole can form specific fluid dynamic characteristics in the first annular gap, which helps the jet to better penetrate and disturb the surrounding fluid, thereby improving the degree and effect of the jet. The appropriate annular gap distance can ensure sufficient interaction between the jet and the surrounding fluid in the first inner tube. This interaction includes collision, shear and diffusion, which helps to accelerate the mixing and mass transfer process of the fluid; an annular gap distance that is too large may cause the jet to encounter too much resistance when passing through the annular gap, thereby losing energy, and an annular gap distance of 0.5~10mm can reduce unnecessary energy loss while ensuring the jet effect, so that the jet can maintain a higher speed and pressure.

[0021] Furthermore, the inner diameter of the first inner tube is 0.5~10mm. Firstly, when the inner diameter of the first inner tube is within this range, the fluid can flow at a higher speed in the first inner tube. The higher flow rate is conducive to the interaction and collision between the fluids, thereby promoting mixing. In addition, the increase in flow rate can also enhance the scouring effect of the fluid on the tube wall, reduce the retention and deposition of the fluid on the tube wall, and further improve the mixing uniformity. In addition, the appropriate inner diameter can ensure that the fluid is evenly distributed in the first inner tube. This uniform distribution helps to reduce mixing dead corners, and the inner diameter range of 0.5~10mm can make the fluid form a more uniform flow state in the first inner tube, thereby reducing mixing dead corners and improving mixing uniformity. At the same time, the smaller inner diameter helps the fluid to form turbulence in the first inner tube and accelerate the mixing rate.

[0022] Furthermore, a spoiler component is provided inside the second inner tube. The design of the spoiler component usually has a complex shape and structure. These components can significantly break the laminar flow state of the fluid in the second inner tube, causing the fluid to generate strong disturbances and shear forces during the flow process. Such disturbances help to form turbulence and improve mixing uniformity. At the same time, the spoiler component also improves the exchange process of reaction heat, effectively realizes the control of the temperature of the reaction system, and realizes the control of the reaction rate and selectivity.

[0023] Furthermore, a condensate inlet and a condensate outlet are provided on the second outer tube; the condensate inlet is arranged close to the liquid outlet of the second inner tube, and the condensate outlet is arranged away from the liquid outlet of the second inner tube, thereby forming countercurrent condensation, ensuring sufficient contact between the condensate and the hot fluid, and improving the heat exchange efficiency; the arrangement of the condensate inlet and outlet helps to reduce heat loss, and the condensate quickly contacts with the hot fluid at the inlet, reducing the heat loss caused by the fluid flow. At the same time, the condensate is smoothly discharged at the outlet, avoiding additional heat loss caused by retention, and effectively realizing effective control of the reaction liquid problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A side view of a microchannel jet reactor in the present invention from one viewing angle; Figure 2 A side view of a microchannel jet reactor in the present invention from another perspective; Figure 3 It is a structural schematic diagram of a sample injection unit in a specific embodiment of the present invention; Figure 4 It is a partial structural schematic diagram of the main mixing unit in the present invention; Figure 5 Schematic diagram of the structure of a reaction unit in one embodiment of the present invention.

[0026] Wherein: 1. injection unit, 11. first injection port, 12. premixing chamber, 13. sample outlet, 2. main mixing unit, 21. first inner tube, 211. through hole, 22. first outer tube, 23. first annular gap, 231. second injection port, 3. reaction unit, 31. second inner tube, 311. spoiler assembly, 32. second outer tube, 321. condensate inlet, 322. condensate outlet, 323. drain port, 33. second annular gap. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings: Example 1 like Figure 1~2 As shown, the present invention discloses a microchannel jet reactor, comprising an injection unit 1, a main mixing unit 2 and a reaction unit 3 which are connected in sequence; the main mixing unit 2 comprises a first inner tube 21 and a first outer tube 22 which is sleeved outside the first inner tube 21; a first annular gap 23 is formed between the first inner tube 21 and the first outer tube 22; the injection unit 1 is connected to the first inner tube 21; a second injection port 231 is provided on the first annular gap 23, and a plurality of through holes 211 are provided on the first inner tube 21; the reaction unit 3 comprises a second inner tube 31 and a second outer tube 32 which is sleeved outside the second inner tube 31; a second annular gap 33 is formed between the second inner tube 31 and the second outer tube 32; the first inner tube 21 is connected to the second inner tube 31; when in use, condensate is provided in the second annular gap 33.

[0034] Therefore, for the microchannel jet reactor in the present invention, the main structures of the main mixing unit 2 and the reaction unit 3 include two circular tubes with different diameters and the same wall thickness, the two circular tubes can be placed concentrically, the annular gap between the inner tube and the outer tube can be in the millimeter scale, and the inner diameter scale of the inner tube can also be in the millimeter scale. The first inner tube 21 and the first outer tube 22 can be connected in a closed welding manner, and the second inner tube 31 and the second outer tube 32 can also be connected in a closed welding manner.

[0035] Preferably, the first inner tube 21, the first outer tube 22, the second inner tube 31 and the second outer tube 32 are made of at least one of a single metal material, an alloy material and a non-metal material.

[0036] The alloy material is at least one of stainless steel, titanium alloy, Hastelloy, aluminum alloy, Inconel, Monel, titanium aluminum alloy and tungsten-molybdenum alloy. The non-metal material is at least one of glass, silicon carbide, polytetrafluoroethylene (PTFE), quartz and ceramic materials.

[0037] like Figure 3 As shown, the injection unit 1 includes a plurality of first injection ports 11, a premixing chamber 12 and an outlet 13; the premixing chamber 12 is connected to the plurality of first injection ports 11 and outlets 13; the outlet 13 is connected to the first inner tube 21. In a further preferred embodiment, the injection unit 1 includes three injection ports 11, and the three injection ports 11 and outlets 13 are evenly spaced outside the premixing chamber 12. The plurality of first injection ports 11 can be used to input the same reaction solution, or can be used to input different reaction solutions.

[0038] like Figure 1 , 2 As shown in FIG. 4 , in order to improve the uniformity of mixing, a plurality of the through holes 211 are evenly spaced along the axial direction and the circumferential direction of the first inner tube 21 .

[0039] In addition, the angle between the through hole 211 and the outer wall of the first inner tube 21 is 15° to 65°, and the inner diameter of the through hole 211 is preferably 0.1 to 5 mm.

[0040] The inner diameters of the first inner tube 21 and the second inner tube 31 are preferably 0.5-10 mm, and the distances of the first annular gap 23 and the second annular gap 33 along the radial direction are both 0.5-10 mm.

[0041] Furthermore, in order to improve the further mixing of materials and the dissipation of reaction heat during the reaction process, a spoiler component 311 is provided inside the second inner tube 31. The spoiler component 311 can be an internal plug-in of different structures, and can be one or a combination of a spiral coil, a baffle, a fin, a tie, a deflection ring and a spoiler.

[0042] In order to facilitate the transmission of condensate and improve the condensation effect, Figure 5 As shown, the second outer tube 32 is provided with a condensate inlet 321 and a condensate outlet 322; the condensate inlet 321 is arranged close to the liquid outlet of the second inner tube 31, and the condensate outlet 322 is arranged far away from the liquid outlet of the second inner tube 31, forming a reverse condensation process, which effectively improves the condensation efficiency.

[0043] In addition, in order to discharge the condensed liquid after the reaction, a drain port 323 is provided at the free end of the second outer tube 32 .

[0044] The present invention combines microchannel technology with microjet technology to propose a novel microchannel jet reactor. In terms of mixing uniformity, the mixing of fluids in a microchannel reactor mainly relies on molecular diffusion and laminar mixing. In some cases, the mixing effect may not be as good as that of a microchannel jet reactor. A microchannel jet reactor can form strong turbulence and shear force through a high-speed jet, so that reactants can be mixed more quickly and evenly. In contrast, a microchannel reactor may have deficiencies in mixing efficiency for a reaction system that requires highly uniform mixing, resulting in a certain impact on the reaction rate and selectivity. The mixing effect is easy to control. The mixing effect of a microchannel reactor is affected by multiple factors such as channel structure and fluid flow rate, and it is difficult to accurately control the mixing process. A microchannel jet reactor can more flexibly control the mixing effect by adjusting parameters such as the speed and angle of the jet, making it easier to meet the needs of different reactions. The risk of solid particle blockage. During the reaction process, if solid substances such as catalysts and solid particles in the reaction products are generated, the microchannel reactor is more likely to be blocked. Because the size of the microchannel is small, solid particles are easily accumulated in the channel, hindering the flow of the fluid and affecting the normal progress of the reaction. In the microchannel jet reactor, high-speed jet can reduce the deposition of solid particles to a certain extent and reduce the risk of clogging.

[0045] Example 2 A microchannel jet reactor without any structural modification was selected for implementation. The material of the inner tube and the outer tube is 304 stainless steel. The lengths of the inner tube and the outer tube are 1800 mm and 1700 mm respectively. The wall thickness of the inner tube and the outer tube is 1 mm. The adjacent tubes are sealed and connected by welding technology, and contain insulation materials to prevent heat loss generated by the reaction. The inner tube and the outer tube of the main reaction unit are connected to the cross-shaped channel of the top packing unit by welding technology. Liquid working fluid is used for reaction. The working fluid is added through the cross-shaped channel and the injection port at the top of the outer tube of the main reaction unit. The outer wall of the inner tube of the main reaction unit has an oblique opening structure. After the working fluid is added, the working fluid in the annular gap of the main reaction unit will jet into the inner tube, and form strong turbulence and shear force with the working fluid in the inner tube through high-speed jets, so that the reactants are mixed more quickly and evenly. After that, the mixed working fluid will enter the turbulent condensation unit. The results show that compared with the microchannel reactor without the inner tube of the oblique opening structure under the same experimental conditions, the microchannel jet reactor with the oblique opening structure has greatly improved the reaction efficiency, the mixing effect is easier to control, and the probability of blockage is reduced.

[0046] Example 3 A microchannel jet reactor with a spiral coil structure modification in the inner tube of the turbulent condensation unit was selected for implementation to further enhance the mixing and reaction efficiency of the microchannel jet reactor without structural modification. The inner tube and the outer tube are made of 304 stainless steel. The lengths of the inner tube and the outer tube are 1800 mm and 1700 mm respectively. The wall thickness of the inner tube and the outer tube is 1 mm. The adjacent tubes are sealed and connected by welding technology, and contain insulation materials to prevent heat loss generated by the reaction. The inner tube and the outer tube of the main reaction unit are connected to the cross-shaped channel of the top packing unit by welding technology. Liquid working fluid is used for reaction. The working fluid is added through the cross-shaped channel and the injection port at the top of the outer tube of the main reaction unit. The outer wall of the inner tube of the main reaction unit has an oblique opening structure. After the working fluid is added, the working fluid in the annular gap of the main reaction unit will jet into the inner tube, and form strong turbulence and shear force with the working fluid in the inner tube through high-speed jets, so that the reactants are mixed more quickly and evenly. The mixed working fluid will then enter the turbulent condensation unit, and after the turbulent disturbance of the spiral coil structure in the inner tube, the mixing and reaction efficiency will be further improved. The results show that compared with the microchannel jet reactor without structural modification under the same experimental conditions, the microchannel jet reactor with spiral coil structure modification has a further improved reaction efficiency.

[0047] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the scope of protection of the present invention, which is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present invention.

Claims

1. A microchannel jet reactor, characterized in that: It comprises a sampling unit (1), a main mixing unit (2) and a reaction unit (3) which are connected in sequence; The main mixing unit (2) comprises a first inner tube (21) and a first outer tube (22) sleeved outside the first inner tube (21); a first annular gap (23) is formed between the first inner tube (21) and the first outer tube (22); the injection unit (1) is connected to the first inner tube (21); a second injection port (231) is provided on the first annular gap (23), and a plurality of through holes (211) are provided on the first inner tube (21); The reaction unit (3) comprises a second inner tube (31) and a second outer tube (32) sleeved outside the second inner tube (31); a second annular gap (33) is formed between the second inner tube (31) and the second outer tube (32); the first inner tube (21) and the second inner tube (31) are connected; When in use, condensate is arranged in the second annular gap (33).

2. A microchannel jet reactor according to claim 1, characterized in that: The injection unit (1) comprises a plurality of first injection ports (11), a premixing chamber (12) and a sample outlet (13); the premixing chamber (12) is connected to the plurality of first injection ports (11) and the sample outlet (13); the sample outlet (13) is connected to the first inner tube (21).

3. A microchannel jet reactor according to claim 2, characterized in that: The injection unit (1) comprises three injection ports (11), and the three injection ports (11) and the sample outlet (13) are evenly spaced and arranged outside the premixing chamber (12).

4. A microchannel jet reactor according to claim 1, characterized in that: The plurality of through holes (211) are evenly spaced along the axial direction and the circumferential direction of the first inner tube (21).

5. A microchannel jet reactor according to claim 1, characterized in that: The included angle between the through hole (211) and the outer wall of the first inner tube (21) is 15° to 65°.

6. A microchannel jet reactor according to claim 1, characterized in that: The inner diameter of the through hole (211) is 0.1-5 mm.

7. A microchannel jet reactor according to claim 1, characterized in that: The distance of the first annular gap (23) along the radial direction is 0.5-10 mm.

8. A microchannel jet reactor according to claim 1, characterized in that: The inner diameter of the first inner tube (21) is 0.5-10 mm.

9. A microchannel jet reactor according to claim 1, characterized in that: A spoiler component (311) is provided inside the second inner tube (31).

10. The microchannel jet reactor according to claim 1, characterized in that: The second outer tube (32) is provided with a condensate inlet (321) and a condensate outlet (322); the condensate inlet (321) is arranged close to the liquid outlet of the second inner tube (31), and the condensate outlet (322) is arranged away from the liquid outlet of the second inner tube (31).

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