Microchannel reactor

Abstract

The application provides a micro-channel reactor, which comprises a reactor shell, a plurality of material inlets arranged on one side of the reactor shell and connected with each other, a material outlet arranged on the other side of the reactor shell, a reaction micro-channel arranged in the reactor shell and connected with the material inlets and the material outlet, an upper heat preservation plate and a lower heat preservation plate arranged on the reactor shell, a cavity formed between the upper heat preservation plate and the lower heat preservation plate, the reaction micro-channel being arranged in the cavity, a heat conducting medium inlet arranged on the upper heat preservation plate and connected with the cavity, and a heat conducting medium outlet arranged on the lower heat preservation plate and connected with the cavity. The micro-channel reactor can effectively improve the mass transfer and heat transfer efficiency, improve the fluid mixing degree and efficiency, and can change the flow channel structure according to the reaction type and the material type, and has wide adaptability and practicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chemical equipment, in particular to a micro-channel reactor. BACKGROUND

[0002] The micro-reactor is also called micro-channel reactor, which is a general term for a series of micro-chemical equipment such as micro-reactor, micro-mixer, micro-heat exchanger, micro-controller, micro-extractor and micro-chemical analysis. The micro-reactor commonly referred to is a micro-reactor whose internal structure (such as flow channel) has a characteristic size of sub-micron to sub-millimeter, which is manufactured at least partially by micro-reaction technology or ultra-precision machining technology. Compared with conventional reaction equipment (such as reaction kettle, tubular reactor), the micro-reactor has much smaller characteristic size, which makes it have large specific surface area. With the decrease of size, the increase of some physical quantity gradient will accelerate, such as temperature gradient, pressure gradient, concentration gradient and density gradient, which is particularly important for chemical reaction. The increase of gradient will lead to the increase of mass transfer and heat transfer driving force, thereby expanding the diffusion flux per unit volume or unit area and strengthening the mass transfer and heat transfer process.

[0003] The Chinese patent document CN110813207A provides a continuous channel reactor for synthesis of acrylate resin, a polymerization reaction device and application. The mass transfer and heat exchanger of the reactor includes a plate body and a plurality of cavity units, and the cavity unit includes a cavity, a circular arc jet baffle, a turbulence column, a material inlet and a material outlet. However, the reactor is connected by a single cavity unit, and the mass transfer and heat transfer effect is limited, and the fluid is prone to stratification.

[0004] Nowadays, there are various micro-channel reactors with different design structures on the market, which have problems such as poor heat transfer effect, uneven mixing, low mixing efficiency, etc. In addition, there is a lack of a reactor that can change the flow channel structure according to the reaction type and material type. Therefore, it is necessary to develop a micro-channel reactor with good mass transfer and heat transfer effect, high mixing efficiency and strong practicality. SUMMARY

[0005] In order to solve the problems in the prior art, the purpose of the present application is to provide a micro-channel reactor, which can effectively improve the mass transfer and heat transfer efficiency, improve the mixing degree and efficiency of the fluid, and change the flow channel structure according to the reaction type and material type, and has wide adaptability and practicality.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] A kind of micro channel reactor, including reactor shell 1, the reactor shell 1 one side is equipped with several mutually connected material inlet 21, the other side is equipped with material outlet 22;The reactor shell 1 is equipped with reaction micro channel 3, the reaction micro channel 3 with the material inlet 21 and the material outlet 22 are communicated;Upper heat preservation plate 41 and lower heat preservation plate 42 are equipped on the reactor shell, the upper heat preservation plate 41 and lower heat preservation plate 42 between form cavity 5, the reaction micro channel 3 is located in the cavity 5;Upper heat preservation plate 41 is opened with the cavity 5 and is communicated with heat conducting medium inlet 61, lower heat preservation plate 42 is opened with the cavity 5 and is communicated with heat conducting medium outlet 62.

[0008] Preferably, the reaction micro channel 3 includes several micro channel groups 7, each micro channel group 7 is composed of several mixed flow structures 8 and a steady flow structure 9.

[0009] Preferably, the mixed flow structure 8 is composed of arc inner wall 81 and baffle zone 82;Two adjacent mixed flow structures 8 are communicated by straight channel 10;The arc inner wall 81 is formed by the intersection of three circular arcs with radius R1, and the centers of the three circular arcs form the vertices of an equilateral triangle;The baffle zone 82 is composed of a split flow arc 821 and a baffle arc 822;The split flow arc 821 has the same center as the arc inner wall 81 and a radius r1, and the baffle arc 822 is tangent to two adjacent split flow arcs 821 and has a radius r2.

[0010] Preferably, the radius R1 of the arc inner wall 81 is 4-8 mm, and the central angle corresponding to the circular arc is 210°;The radius r1 of the split flow arc 821 is 0.2-0.8 times the radius R1 of the arc inner wall 81;The radius r2 of the baffle arc 822 is 1.4-2 times the radius R1 of the arc inner wall 81.

[0011] Preferably, the steady flow structure 9 has a radius R2 of 5-10 mm, and a plurality of flow blocking columns 91 are uniformly distributed in the steady flow structure 9, the radius r3 of the flow blocking column 91 is 0.1-0.5 times the radius R2 of the steady flow structure 9, and the number of the flow blocking columns 91 is 3-7;The steady flow structure 9 is communicated with the mixed flow structure 8 through the straight channel 10.

[0012] Preferably, the steady flow structure 9 of the first micro channel group 7 is communicated with the material inlet 21, and the tail mixed flow structure 8 of the last micro channel group 7 is communicated with the material outlet 22.

[0013] Preferably, in two adjacent micro channel groups 7, the tail mixed flow structure 8 of one micro channel group 7 is communicated with the steady flow structure 9 of the other micro channel group 7.

[0014] Preferably, the micro channel groups 7 are arranged in axial symmetry.

[0015] The application also claims a mixing process using the micro-channel reactor, comprising the following steps: injecting a plurality of fluids into the reaction micro-channel through the material inlets 21 respectively to form a mixed flow, repeatedly dividing and mixing the mixed flow through the reaction micro-channel 3, and then leading out through the material outlet 22; injecting the heat-conducting medium from the heat-conducting medium inlet 61, conducting heat through the reaction micro-channel 3, and then flowing out from the heat-conducting medium outlet 62.

[0016] Compared with the prior art, the application has the following beneficial effects:

[0017] 1) The application is provided with a large number of arc-shaped structures, which reduces the mixing blind area under the premise of ensuring the mixing effect and flow rate, increases the specific surface area of the reaction device, and significantly improves the heat transfer coefficient and heat exchange effect, thereby obtaining excellent heat transfer effect.

[0018] 2) When the material enters the mixing structure, it collides with the diversion arc of the baffle area, and the material is divided into two diversion arcs to the arc-shaped inner wall, then collides with the diversion arc and the arc-shaped inner wall in turn, and finally flows out at the outlet. The material continuously contacts and exchanges heat with the arc-shaped structure during the flow process, thereby sufficiently prolonging the reaction time of the material, ensuring that the reaction can be carried out completely, and effectively improving the conversion rate and yield of the product.

[0019] 3) When pumping the material to the material inlet, the material directly enters the mixing structure due to different pressures of different materials, which causes the fluid to be stratified, thereby leading to insufficient reaction. Therefore, the application uses the flow blocking column in the steady flow structure to reduce the flow rate of the material, so that the material fluid flows more smoothly and uniformly. The fluid after steady flow can fully play the mixing effect of the mixing structure, so that the reaction is more complete.

[0020] 4) The application sets the radius r1 of the internal arc-shaped baffle plate as 1.4-2 times the radius R1 of the arc-shaped structure, sets the internal circular arc radius r2 as 0.2-0.8 times the radius R1 of the arc-shaped structure, and sets the radius r3 of the flow blocking column as 0.1-0.5 times the radius R2 of the steady flow structure, so that the fluid can form a vortex when passing through the reaction micro-channel, and the vortex retention time is prolonged to the maximum extent, thereby obtaining excellent mixing effect.

[0021] 5) The application sequentially connects the steady flow structure and the mixing structure, which not only improves the mixing efficiency but also increases the capacity of the reactor; the steady flow structure and the mixing structure can select different design schemes according to the reaction type and the material type, thereby effectively increasing the adaptability and practicality of the micro-channel reactor. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. Other related drawings can also be obtained by those of ordinary skill in the art without any creative effort, on the premise of not paying any creative effort.

[0023] Figure 1 It is a structural side view of the micro-channel reactor device of the present application.

[0024] Figure 2 It is a structural view of the reaction micro-channel of the micro-channel reactor of the present application.

[0025] Figure 3 It is a structural view of the micro-channel group of the micro-channel reactor of the present application.

[0026] Figure 4 It is a structural view of the mixing flow structure of the micro-channel reactor of the present application.

[0027] Figure 5 It is a structural view of the micro-channel reactor of the present application.

[0028] Figure 6 It is a structural view of the micro-channel reactor of the present application.

[0029] Figure 7 It is a structural view of the micro-channel reactor of the present application.

[0030] Wherein: 1, shell; 21, material inlet; 22, material outlet; 3, reaction micro-channel; 41, upper heat preservation plate; 42, lower heat preservation plate; 5, cavity; 61, heat conducting medium inlet; 62, heat conducting medium outlet; 7, micro-channel group; 8, mixing flow structure; 81, arc-shaped inner wall; 82, baffle area; 821, flow dividing arc; 822, baffle arc; 9, flow stabilizing structure; 91, flow blocking column; 10, straight channel. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in details in combination with the embodiments. Of course, the specific embodiments described herein are only used to explain the present application, and should not be considered as a limitation to the present application.

[0032] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "arrange", "mount", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] As shown in Figure 1 The present application provides a kind of microchannel reactor, including reactor shell 1, the reactor shell 1 one side is equipped with several mutually connected material inlet 21, the other side is equipped with material outlet 22;The reactor shell 1 is equipped with reaction microchannel 3, the reaction microchannel 3 with the material inlet 21 and the material outlet 22 are communicated;Upper heat preservation plate 41 and lower heat preservation plate 42 are arranged on the reactor shell, the cavity 5 is formed between the upper heat preservation plate 41 and the lower heat preservation plate 42, and the reaction microchannel 3 is located in the cavity 5;Thermal medium inlet 61 is opened in the upper heat preservation plate 41 and communicated with the cavity 5, and thermal medium outlet 62 is opened in the lower heat preservation plate 42 and communicated with the cavity 5;Preferably, the material inlet is 2-3;Fluid is injected into the reaction microchannel through material inlet 21 respectively and is gathered to form mixed flow, and the mixed flow is guided out through material outlet 22 after repeated segmentation and mixing in reaction microchannel 3;Thermal medium is injected from thermal medium inlet 61, and flows out from thermal medium outlet 62 after heat exchange in reaction microchannel 3.

[0034] As a special structure of the present application, as shown in Figure 2 、 Figure 3 The reaction microchannel 3 includes a plurality of microchannel groups 7, each microchannel group 7 is composed of a plurality of mixed flow structures 8 and a steady flow structure 9;The microchannel group is preferably 6-12, and the mixed flow structure in each microchannel group is preferably 8-12.

[0035] More specifically, as shown in Figure 3 、 Figure 4 The mixed flow structure 8 is composed of an arc-shaped inner wall 81 and a baffle zone 82;Two adjacent mixed flow structures 8 are communicated through a straight channel 10;The arc-shaped inner wall 81 is composed of three arcs with a radius R1, and the centers of the three arcs form the vertices of an equilateral triangle;The baffle zone 82 is composed of a shunt arc 821 and a baffle arc 822;The shunt arc 821 has the same center as the arc-shaped inner wall 81 and a radius r1, and the baffle arc 822 is tangent to two adjacent shunt arcs 821 and has a radius r2.

[0036] Wherein, the radius R1 of the arc-shaped inner wall 81 is 4-8 mm, and the central angle corresponding to the arc is 210°; the radius r1 of the flow-dividing arc 821 is preferably 0.2-0.8 times the radius R1 of the arc-shaped inner wall 81; the radius r2 of the flow-deflecting arc 822 is preferably 1.4-2 times the radius R1 of the arc-shaped inner wall 81; the microchannel reactor provided by the present invention is provided with a large number of arc-shaped structures, which reduces the mixing blind zone, increases the specific surface area of ​​the reaction device, and significantly improves the thermal conductivity and heat exchange effect; when the fluid collides with the arc-shaped structure, it can fully form vortices and prolong the vortex holding time to the maximum extent, thereby obtaining an excellent mixing effect.

[0037] Among them, such as Figure 3 As shown, the radius R2 of the flow stabilizing structure 9 is 5-10 mm, and a number of flow-blocking columns 91 are evenly distributed within the flow stabilizing structure 9. The radius r3 of the flow-blocking column 91 is preferably 0.1-0.5 times the radius R2 of the flow stabilizing structure, and the number of flow-blocking columns 91 is preferably 3-7. The flow stabilizing structure 9 and the mixing structure 8 are connected through a straight channel 10. The present invention utilizes the flow-blocking columns 91 in the flow stabilizing structure 9 to reduce the material flow rate, making the material flow more stable and uniform. The fluid after flow stabilization can fully utilize the mixing effect of the mixing structure 8 when it enters the mixing structure 8, making the reaction more complete.

[0038] Furthermore, the flow stabilizing structure 9 of the first microchannel group 7 is connected to the material inlet 21; the tail mixing structure 8 of the last microchannel group 7 is connected to the material outlet 22; in two adjacent microchannel groups 7, the tail mixing structure 8 of one microchannel group 7 is connected to the flow stabilizing structure 9 of the other microchannel group 7; the microchannel groups 7 are arranged axially symmetrically; the material enters the flow stabilizing structure 9 through the material inlet 21, then passes through several mixing structures 8, and is connected to the flow stabilizing structure 9 of the adjacent microchannel group 7 through the channel, and passes through several microchannel groups 7 until it is discharged from the tail mixing structure 8 of the last microchannel group 7.

[0039] The working principle of the microchannel reactor provided by this invention is as follows: Multiple fluids are injected into the reaction microchannel through the material inlet to form a mixed flow. The flow velocity is reduced by the baffle column in the flow stabilization structure to prevent the multiple fluids from stratifying due to different pump pressures. After entering the mixing structure, the mixed flow collides with the flow-dividing arc in the baffle zone, and the fluid is divided into two streams and deflected to the arc-shaped inner wall. Then, it collides with the baffle arc and the arc-shaped inner wall in sequence, and finally accelerates at the outlet to enter the next mixing structure at high speed. The mixed flow is repeatedly divided and mixed through the series of microchannels and then discharged through the material outlet.

[0040] Numerical simulations were performed in Fluent software to analyze the structure of the microchannel reactor. Both solvents used were ethanol. The mixing index γ was calculated using the following equation to evaluate the mixing efficiency:

[0041]

[0042] wherein: W i is the mass fraction of solvent corresponding to the i-th grid on the outlet surface; is the average mass fraction of solvent on the outlet surface; A i is the area corresponding to the i-th grid on the outlet surface.

[0043] Example 1

[0044] A micro-channel reactor comprises a reactor shell, two material inlets in communication with each other on one side of the reactor shell, and a material outlet on the other side of the reactor shell; a reaction micro-channel is arranged in the reactor shell and in communication with the material inlets and the material outlet; an upper heat preservation plate and a lower heat preservation plate are arranged on the reactor shell, and a cavity is formed between the upper heat preservation plate and the lower heat preservation plate, and the reaction micro-channel is arranged in the cavity; a heat conducting medium inlet in communication with the cavity is formed in the upper heat preservation plate, and a heat conducting medium outlet in communication with the cavity is formed in the lower heat preservation plate.

[0045] The reaction micro-channel comprises 12 micro-channel groups, each of which is composed of 9 mixed flow structures and 1 steady flow structure.

[0046] The mixed flow structure is composed of an arc-shaped inner wall and a baffle area; two adjacent mixed flow structures are communicated through a straight channel; the arc-shaped inner wall is formed by the intersection of three circular arcs with a radius of 4.6188 mm, and the central angles of the circular arcs are 210°, and the centers of the three circular arcs form the vertices of an equilateral triangle; the baffle area is composed of a shunt arc and a baffle arc; the shunt arc has the same center as the arc-shaped inner wall and a radius of 1.0716 mm, and the baffle arc is tangent to two adjacent shunt arcs and has a radius of 6.9284 mm.

[0047] The steady flow structure is a circle with a radius of 6.0000 mm, and seven flow blocking columns with a radius of 1.0000 mm are uniformly distributed in the steady flow structure; the steady flow structure is communicated with the mixed flow structure through a straight channel, and the width of the straight channel is 2.0000 mm and the length is 2.0000 mm.

[0048] The steady flow structure of the first micro-channel group is communicated with the material inlet; the tail mixed flow structure of the last micro-channel group is communicated with the material outlet; in adjacent two micro-channel groups, the tail mixed flow structure of one micro-channel group is communicated with the steady flow structure of the other micro-channel group through a U-shaped pipe, and the width of the U-shaped pipe is 2.0000 mm; the micro-channel groups are arranged in axial symmetry.

[0049] The microchannel reactor described in Example 1 was used to mix ethanol and ethanol in a ratio of 1:1 at different flow rates to evaluate the mixing efficiency with γ as the mixing index. When 12 microchannel groups were simulated, the mixing index at different flow rates reached 100%; while when only 1 microchannel group was simulated, the mixing index at flow rates of 40 mL / min, 60 mL / min, 80 mL / min, and 100 mL / min was 0.6450, 0.6869, 0.6998, and 0.7088, respectively.

[0050] Example 2

[0051] A microchannel reactor comprises a reactor shell, one side of which is provided with 2 material inlets in communication with each other, and the other side is provided with a material outlet; the reactor shell is provided with a reaction microchannel, which is in communication with the material inlets and the material outlet; the reactor shell is provided with an upper heat preservation plate and a lower heat preservation plate, and a cavity is formed between the upper heat preservation plate, the lower heat preservation plate, and the reaction microchannel; the upper heat preservation plate is provided with a heat conducting medium inlet in communication with the cavity, and the lower heat preservation plate is provided with a heat conducting medium outlet in communication with the cavity.

[0052] The reaction microchannel comprises 10 microchannel groups, each of which is composed of 8 mixing structures and 1 steady flow structure.

[0053] As shown in Figure 6 , the mixing structure is composed of an arc-shaped inner wall and a baffle zone; two adjacent mixing structures are connected by a straight channel; the arc-shaped inner wall is formed by the intersection of 3 circular arcs with a radius of 4.6188 mm, and the central angles of the circular arcs are 210°, and the centers of the three circular arcs form the vertices of an equilateral triangle; the baffle zone is composed of a distribution arc and a baffle arc; the distribution arc has the same center as the arc-shaped inner wall and a radius of 1.0000 mm, and the baffle arc is tangent to two adjacent distribution arcs and has a radius of 4.0000 mm.

[0054] The steady flow structure is a circle with a radius of 6.0000 mm, and 3 flow blocking columns with a radius of 2.0000 mm are uniformly distributed in the steady flow structure; the steady flow structure is connected to the mixing structure by a straight channel, and the width and length of the straight channel are 2.0000 mm.

[0055] The steady flow structure of the first microchannel group is connected to the material inlet; the tail mixing structure of the last microchannel group is connected to the material outlet; in adjacent two microchannel groups, the tail mixing structure of one microchannel group is connected to the steady flow structure of the other microchannel group by a U-shaped pipe, and the width of the U-shaped pipe is 2.0000 mm; the microchannel groups are arranged in axial symmetry.

[0056] The microchannel reactor described in Example 2 was used to mix ethanol and ethanol in a 1:1 ratio at different flow rates to evaluate the mixing efficiency with γ as the mixing index. When simulating 10 microchannel groups, the mixing index at different flow rates reached 100%; while when simulating only 1 microchannel group, the mixing index at flow rates of 40 mL / min, 60 mL / min, 80 mL / min, and 100 mL / min was 0.6430, 0.6754, 0.6957, and 0.7093, respectively.

[0057] Example 3

[0058] A microchannel reactor comprises a reactor shell, one side of which is provided with 2 material inlets in communication with each other, and the other side is provided with a material outlet; the reactor shell is provided with a reaction microchannel, which is in communication with the material inlets and the material outlet; the reactor shell is provided with an upper heat preservation plate and a lower heat preservation plate, and a cavity is formed between the upper heat preservation plate, the lower heat preservation plate, and the reaction microchannel; the upper heat preservation plate is provided with a heat conducting medium inlet in communication with the cavity, and the lower heat preservation plate is provided with a heat conducting medium outlet in communication with the cavity.

[0059] The reaction microchannel comprises 10 microchannel groups, each of which is composed of 10 mixing structures and 1 steady flow structure.

[0060] As shown in Figure 7 , the mixing structure is composed of an arc-shaped inner wall and a baffle zone; two adjacent mixing structures are connected by a straight channel; the arc-shaped inner wall is formed by the intersection of 3 circular arcs with a radius of 4.1688 mm, and the central angles of the circular arcs are 210°, and the centers of the three circular arcs form the vertices of an equilateral triangle; the baffle zone is composed of a distribution arc and a baffle arc; the distribution arc has the same center as the arc-shaped inner wall and a radius of 1.6000 mm, and the baffle arc is tangent to two adjacent distribution arcs and has a radius of 6.7880 mm.

[0061] The steady flow structure is a circle with a radius of 6.0000 mm, and 7 flow blocking columns with a radius of 1.0000 mm are uniformly distributed in the steady flow structure; the steady flow structure is connected to the mixing structure by a straight channel, and the width and length of the straight channel are 2.0000 mm.

[0062] The steady flow structure of the first microchannel group is connected to the material inlet; the tail mixing structure of the last microchannel group is connected to the material outlet; in adjacent two microchannel groups, the tail mixing structure of one microchannel group is connected to the steady flow structure of the other microchannel group by a U-shaped pipe, and the width of the U-shaped pipe is 2.0000 mm; the microchannel groups are arranged in axial symmetry.

[0063] The microchannel reactor described in Example 2 was used to mix ethanol and ethanol in a 1:1 ratio at different flow rates to evaluate the mixing efficiency using γ as the mixing index. When 10 microchannel groups were simulated, the mixing index at different flow rates reached 100%; when only 1 microchannel group was simulated, the mixing index at flow rates of 40 mL / min, 60 mL / min, 80 mL / min, and 100 mL / min was 0.6342, 0.6741, 0.6913, and 0.7024, respectively.

[0064] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes within the technical scope disclosed by the present application according to the technical solutions and inventive concepts of the present application, which should be encompassed within the protection scope of the present application.

Claims

1. A microchannel reactor, characterized in that, The reactor includes a reactor shell (1), on one side of which are provided several interconnected material inlets (21), and on the other side, a material outlet (22); a reaction microchannel (3) is provided inside the reactor shell (1), and the reaction microchannel (3) is connected to the material inlets (21) and the material outlet (22); an upper insulation plate (41) and a lower insulation plate (42) are provided on the reactor shell, and a cavity (5) is formed between the upper insulation plate (41) and the lower insulation plate (42), and the reaction microchannel (3) is located in the cavity (5); a heat-conducting medium inlet (61) communicating with the cavity (5) is opened on the upper insulation plate (41), and a heat-conducting medium outlet (62) communicating with the cavity (5) is opened on the lower insulation plate (42); The reaction microchannel (3) includes several microchannel groups (7), each microchannel group (7) consisting of several mixing structures (8) and a steady-flow structure (9); The mixing structure (8) consists of an arc-shaped inner wall (81) and a deflection zone (82); two adjacent mixing structures (8) are connected by a straight channel (10); the arc-shaped inner wall (81) is formed by the intersection of three circular arcs with a radius of R1, and the centers of the three circular arcs form the vertices of an equilateral triangle; the deflection zone (82) consists of a flow-dividing arc (821) and a deflection arc (822); the flow-dividing arc (821) shares the same center with the arc-shaped inner wall (81) and has a radius of r1, and the deflection arc (822) is tangent to two adjacent flow-dividing arcs (821) and has a radius of r2; The radius R1 of the arc-shaped inner wall (81) is 4-8 mm, and the central angle corresponding to the arc is 210°; the radius r1 of the diversion arc (821) is 0.2-0.8 times the radius R1 of the arc-shaped inner wall (81); the radius r2 of the deflection arc (822) is 1.4-2 times the radius R1 of the arc-shaped inner wall (81); The radius R2 of the flow stabilizing structure (9) is 5-10 mm. Several flow-blocking columns (91) are evenly distributed inside the flow stabilizing structure (9). The radius r3 of the flow-blocking column (91) is 0.1-0.5 times the radius R2 of the flow stabilizing structure (9). The number of flow-blocking columns (91) is 3-7. The flow stabilizing structure (9) and the mixing structure (8) are connected through a straight channel (10).

2. A microchannel reactor according to claim 1, characterized in that, The flow stabilization structure (9) of the first microchannel group (7) is connected to the material inlet (21); the tail mixing structure (8) of the last microchannel group (7) is connected to the material outlet (22).

3. A microchannel reactor according to claim 1, characterized in that, In two adjacent microchannel groups (7), the tail mixing structure (8) of one microchannel group (7) is connected to the steady flow structure (9) of the other microchannel group (7).

4. A microchannel reactor according to claim 1, characterized in that, The microchannel group (7) is arranged in an axisymmetric manner.

5. A process for mixing materials using a microchannel reactor according to any one of claims 1 to 4, characterized in that, The process includes the following steps: injecting multiple fluids into the reaction microchannel through the material inlet (21) to form a mixed flow; the mixed flow is repeatedly divided and mixed through the reaction microchannel (3) and then discharged through the material outlet (22); The heat transfer medium is injected from the heat transfer medium inlet (61), and after heat exchange through the reaction microchannel (3), it flows out from the heat transfer medium outlet (62).

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