Microchannel reactor, microchannel reaction device and microchannel reaction method

Abstract

The invention relates to the field of chemical engineering, and discloses a micro-channel reactor, a micro-channel reaction device and a micro-channel reaction method. The micro-channel reactor comprises a gas phase plate and a micro-channel reaction plate which are stacked in the first direction, a plurality of gas phase chambers which are isolated from one another are formed in the side, facing the micro-channel reaction plate, of the gas phase plate, and a plurality of gas inlets communicated with the gas phase chambers are formed in the gas phase plate; a plurality of micro-channel areas communicated with fluid are formed on one side, facing the gas phase plate, of the micro-channel reaction plate, the plurality of micro-channel areas and the plurality of gas phase chambers are arranged in a one-to-one correspondence manner, the arrangement direction of the plurality of micro-channel areas is consistent with the flowing direction of the fluid, and a microporous membrane is arranged between each micro-channel area and the corresponding gas phase chamber in a sealing manner. The micro-channel reactor disclosed by the invention has the advantages of small volume, simple structure, good mixing effect and high reaction efficiency.

Description

Technical Field

[0001] The present invention relates to the field of chemical industry, and in particular to a microchannel reactor. Based on this, it also relates to a microchannel reaction device and a microchannel reaction method. Background Art

[0002] The continuous flow microchannel reactor is a new technology that has emerged in the chemical industry in recent years. With the help of high-end micro-machining technology, it controls the scale of the chemical reaction field between 10 and 1000 μm. The small-scale effect makes the reaction space have a very high specific surface area, enhances the heat convection rate, and shortens the time of molecular diffusion. At present, the continuous flow microchannel reactor is mainly used in liquid-liquid phase reaction and gas-liquid phase reaction. Compared with the traditional stirred reactor technology, the continuous flow microchannel reaction has the advantages of continuous flow reaction, instantaneous micro-processing, high efficiency and safety, easy to use automatic control, mass transfer and heat transfer efficiency increased by thousands of times, and accurate material ratio. Its application range is getting wider and wider.

[0003] When a continuous flow microchannel reactor is applied to a gas-liquid phase reaction, two methods are generally used. One method is to directly introduce the gas medium and the liquid medium into the reactor from the two inlets of the reactor respectively, and the gas-liquid two phases are mixed and reacted in the microchannel reactor; the other method is to pre-mix the gas-liquid two phases before entering the reactor, and then send the gas-liquid mixture into the microchannel reactor under a certain pressure for reaction. Summary of the invention

[0004] The purpose of the present invention is to provide a novel microchannel reactor with small volume, simple structure, good mixing effect and high reaction efficiency, a microchannel reaction device including the microchannel reactor, and a microchannel reaction method.

[0005] The microchannel reactor provided by the present invention comprises a gas phase plate and a microchannel reaction plate stacked along a first direction, a plurality of mutually isolated gas phase chambers are formed on the side of the gas phase plate facing the microchannel reaction plate, and a plurality of gas inlets respectively connected to the plurality of gas phase chambers are arranged on the gas phase plate; a plurality of fluid-connected microchannel areas are formed on the side of the microchannel reaction plate facing the gas phase plate, the plurality of microchannel areas are arranged in one-to-one correspondence with the plurality of gas phase chambers, the arrangement direction of the plurality of microchannel areas is consistent with the fluid flow direction, and a microporous membrane is sealed between each of the microchannel areas and the corresponding gas phase chamber.

[0006] Through the above technical scheme, the microchannel reactor of the present invention is not only small in size and simple in structure, but also when in use, the gas in the gas phase chamber can enter the microchannel of the microchannel reaction plate in the form of microbubbles through the microporous membrane, so that the gas phase is fully mixed with the liquid phase in the microchannel; in addition, gas can be respectively supplied to multiple gas phase chambers through multiple air inlets, so that the gas pressure of the multiple gas phase chambers can be independently regulated, and the liquid in the microchannel can be prevented from reversely entering the gas phase chamber to form a short circuit while reducing energy consumption, ensuring that the gas phase reactants in the gas phase chamber smoothly pass through the microporous membrane into the microchannel, thereby effectively improving the reaction efficiency.

[0007] Optionally, the pore size of the microporous membrane is 50-1000 nm.

[0008] Optionally, a groove for embedding the microporous membrane is provided on the gas phase plate or the microchannel reaction plate, and the depth of the groove is consistent with the thickness of the microporous membrane.

[0009] Optionally, the plurality of microchannel areas and the plurality of gas phase chambers are respectively arranged along a second direction perpendicular to the first direction, the microchannels on the microchannel reaction plate are arranged in an intestinal shape along the second direction, and the microchannel reaction plate is provided with a microchannel inlet and a microchannel outlet respectively connected to the two ends of the microchannel.

[0010] Optionally, the plurality of air inlets are arranged on a side of the gas phase plate facing away from the microchannel reaction plate, and the air inlet directions of the air inlets are consistent with the first direction.

[0011] The microchannel reaction device provided by the present invention comprises an air pressure control system and the above-mentioned microchannel reactor, wherein the air pressure control system is respectively connected to the plurality of air inlets so as to respectively supply air to the plurality of gas phase chambers and control the pressure of the plurality of gas phase chambers.

[0012] Through the above technical scheme, when the microchannel reaction device of the present invention is in use, the gas in the gas phase chamber can enter the microchannel of the microchannel reaction plate in the form of microbubbles through the microporous membrane, so that the gas phase is fully mixed with the liquid phase in the microchannel; in addition, the gas pressure of multiple gas phase chambers can be controlled separately by the gas pressure control system, which can reduce energy consumption while avoiding the liquid in the microchannel from reversely entering the gas phase chamber to form a short circuit, ensuring that the gas phase reactants in the gas phase chamber smoothly pass through the microporous membrane into the microchannel, thereby effectively improving the reaction efficiency.

[0013] Optionally, the gas pressure control system is configured to make the pressure of each gas phase chamber slightly greater than the sum of the corresponding fluid pressure of the microchannel region and the pressure drop of the microporous membrane.

[0014] Optionally, the air pressure control system includes an intake manifold and a plurality of intake branch pipes respectively connected to the plurality of intake ports, the plurality of intake branch pipes are connected to the plurality of intake ports in a one-to-one correspondence, and each of the intake branch pipes is provided with a control valve and a flow meter.

[0015] Optionally, the microchannel reaction device further comprises a heat exchange plate, and the heat exchange plate is attached to a side of the microchannel reaction plate facing away from the gas phase plate.

[0016] Optionally, the microchannel reaction device comprises two relatively stacked microchannel reactors, the heat exchange plate is sandwiched between the two microchannel reaction plates, and the microchannel fluids of the two microchannel reaction plates are connected in series.

[0017] The microchannel reaction method provided by the present invention comprises the following steps:

[0018] S1, introducing a liquid-phase reactant or a solid-liquid mixture formed by a liquid-phase reactant and a solid-phase reactant into the microchannel from a microchannel inlet and allowing it to flow along the microchannel toward a microchannel outlet;

[0019] S2. During the above flow process, the gas phase reactants are continuously introduced into the microchannel in the form of microbubbles in a manner of decreasing pressure along the flow direction, and are fully mixed and reacted with the liquid phase reactants or the solid-liquid mixture.

[0020] The beneficial effects of the above microchannel reaction method are the same as those of the above microchannel reactor.

[0021] Optionally, the step S1 further comprises: grinding the solid-phase reactant into a powder having an average particle size of less than 2 μm, and premixing the powder with the liquid-phase reactant to form the solid-liquid mixture.

[0022] Optionally, the method is carried out using the above-mentioned microchannel reaction device.

[0023] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is an exploded view of an embodiment of the microchannel reaction device of the present invention;

[0026] Figure 2 yes Figure 1 A perspective view of the central gas phase plate;

[0027] Figure 3 yes Figure 2 A side cross-sectional view of the gas phase plate;

[0028] Figure 4 yes Figure 1 A front perspective view of a microchannel reaction plate;

[0029] Figure 5 yes Figure 4 A side cross-sectional view of a microchannel reaction plate;

[0030] Figure 6 yes Figure 1 A front perspective view of the middle heat exchange plate;

[0031] Figure 7 yes Figure 6 Side view of the heat exchange plate.

[0032] Description of Reference Numerals

[0033] 00-fixed hole, 10-gas phase plate, 11-gas phase chamber, 12-air inlet, 20-microchannel reaction plate, 21-microchannel area, 22-microchannel, 23-microchannel inlet, 24-microchannel outlet, 25-first sealing ring, 30-microporous membrane, 40-air pressure control system, 41-inlet main pipe, 42-inlet branch pipe, 43-back pressure valve, 44-flow meter, 50-heat exchange plate, 51-heat exchange channel, 52-medium inlet, 53-medium outlet, 54-sealing groove, 55-second sealing ring. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

[0035] The present invention provides these embodiments to make the present invention thorough and complete, and fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​described in these embodiments should be interpreted as being merely exemplary, rather than as limiting.

[0036] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present invention and simplifying the description, and do 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. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0037] In addition, the words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly perpendicular, but is within the tolerance range. "Parallel" is not strictly parallel, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0038] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0039] All terms used in the present invention have the same meanings as those understood by ordinary technicians in the field to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0040] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0041] The first aspect of the present invention provides a microchannel reactor, comprising: Figure 1A gas phase plate 10 and a microchannel reaction plate 20 are stacked (in the horizontal direction), a plurality of mutually isolated gas phase chambers 11 are formed on the side of the gas phase plate 10 facing the microchannel reaction plate 20, and a plurality of gas inlets 12 respectively connected to the plurality of gas phase chambers 11 are arranged on the gas phase plate 10; a plurality of fluid-connected microchannel areas 21 are formed on the side of the microchannel reaction plate 20 facing the gas phase plate 10, the plurality of microchannel areas 21 are arranged in one-to-one correspondence with the plurality of gas phase chambers 11, the arrangement direction of the plurality of microchannel areas 21 is consistent with the flow direction of the fluid, and a microporous membrane 30 is sealed between each microchannel area 21 and the corresponding gas phase chamber 11.

[0042] It is understood that the microchannel reaction plate 20 has a microchannel 22, and the above fluid flow direction is understood to be the flow direction of the fluid in the microchannel 22. The microporous membrane 30 seals the gas phase chamber 11 into a closed space. Figure 1 As shown, a first sealing ring 25 may be disposed on the outer periphery of the microporous membrane 30 to achieve a sealed arrangement of the microporous membrane 30 .

[0043] Through the above technical scheme, the microchannel reactor of the present invention is not only small in size and simple in structure, but also when in use, the gas in the gas phase chamber 11 can enter the microchannel of the microchannel reaction plate 20 in the form of microbubbles through the microporous membrane 30, so that the gas phase is fully mixed with the liquid phase in the microchannel; in addition, since the microchannel 22 is usually a slender structure, a pressure drop will occur during the flow of the liquid in the microchannel 22, so that the liquid pressure at different positions of the microchannel 22 is different, and the pressure difference between the liquid pressure of different microchannel areas 21 and the air pressure of the corresponding gas phase chamber 11 is different. By setting a plurality of independent closed gas phase chambers 11, the present invention can respectively inlet air into the plurality of gas phase chambers 11 through a plurality of air inlets 12, so that the air pressure of the plurality of gas phase chambers 11 can be independently regulated, and the liquid in the microchannel can be prevented from reversely entering the gas phase chamber 11 to form a short circuit while reducing energy consumption, ensuring that the gas phase reactants in the gas phase chamber 11 smoothly pass through the microporous membrane 30 into the microchannel, thereby effectively improving the reaction efficiency.

[0044] Specifically, Figure 2 and Figure 3 As shown, the gas phase plate 10 is a plate structure, and the gas phase chamber 11 is defined and formed by the grooves on the side of the gas phase plate 10 and the microporous membrane 30 .

[0045] like Figure 4 and Figure 5 As shown, the microchannel reaction plate 20 is a plate structure, and the microchannel 22 is defined by the grooves on the side of the microchannel reaction plate 20 and the microporous membrane 30. The diameter of the microchannel 22 is preferably 50-2000 μm, and the microchannel 22 may include a plurality of mixed structures arranged along the extension direction thereof, wherein the shape of the mixed structure can be designed into different shapes according to different reaction systems, such as umbrella-shaped, heart-shaped (such as Figure 4As shown), linear, O-type or a mixture of these types, etc.

[0046] The microporous membrane 30 is a porous structure, which can be an inorganic ceramic membrane, a metal sintered membrane or other microporous structure materials. The microporous membrane 30 has good filtering and high temperature resistance. The gas can pass through the microporous membrane 30 into the microchannel 22 in the form of microbubbles and fully mix with the medium in the microchannel 22.

[0047] When the above-mentioned microchannel reactor is applied to gas-liquid-solid three-phase reaction, the gas phase and the solid-liquid mixture are respectively located on both sides of the microporous membrane 30, and the pore size of the microporous membrane 30 can be selected according to the particle size of the solid particles to ensure that the pore size of the microporous membrane 30 is smaller than the particle size of the solid particles. According to a preferred embodiment of the present invention, the pore size of the microporous membrane 30 is 50-1000nm, gas and liquid can pass through the membrane pores, and has an excellent interception effect on solid particles larger than the membrane pore size.

[0048] In the present invention, in order to achieve reliable fixation of the microporous membrane 30 , a groove for embedding the microporous membrane 30 may be provided on the gas phase plate 10 or the microchannel reaction plate 20 , and the depth of the groove is consistent with the thickness of the microporous membrane 30 .

[0049] In some embodiments, see Figure 1 , Figure 2 as well as Figure 4 The plurality of microchannel regions 21 and the plurality of gas phase chambers 11 are respectively arranged along a second direction perpendicular to the first direction (see Figure 1 The microchannels 22 on the microchannel reaction plate 20 are arranged in a gut-shaped arrangement along the second direction, and the microchannel reaction plate 20 is provided with a microchannel inlet 23 and a microchannel outlet 24 respectively connected to both ends of the microchannels 22. The second direction can be understood as the direction from the microchannel inlet 23 to the microchannel outlet 24.

[0050] When the reactants include multiple liquid media, the microchannel reaction plate 20 may have multiple microchannel inlets 23 .

[0051] In the present invention, in order to facilitate the gas phase reactants to enter the microchannel 22, as Figure 3 As shown, the plurality of gas inlets 12 are preferably disposed on a side of the gas phase plate 10 facing away from the microchannel reaction plate 20 , and the gas inlet direction of the gas inlet 12 is along a first direction.

[0052] The second aspect of the present invention provides a microchannel reaction device, including a gas pressure control system 40 and the above-mentioned microchannel reactor, wherein the gas pressure control system 40 is respectively connected to a plurality of gas inlets 12, so as to be used to respectively supply gas to a plurality of gas phase chambers 11 and control the pressure of the plurality of gas phase chambers 11. In other words, the gas pressure control system 40 is used to provide a stable pressure for different gas phase chambers 11 of the gas phase plate 10, so as to ensure that the gas phase reactants smoothly enter the microchannel.

[0053] The air pressure control system 40 is configured to make the pressure of each gas phase chamber 11 slightly greater than the sum of the corresponding microchannel zone 21 fluid pressure and the pressure drop of the microporous membrane 30. In other words, the air pressure of the gas phase chamber 11 does not need to be too high, as long as the gas phase chamber 11 is at a slightly positive pressure.

[0054] In some embodiments, Figure 1 As shown, the air pressure control system 40 includes an intake manifold 41 and a plurality of intake branches 42 respectively connected to the plurality of intake ports 12. The plurality of intake branches 42 are connected to the plurality of intake ports 12 one by one, and a control valve 43 and a flow meter 44 are provided on each intake branch 42. The control valve 43 may be a back pressure valve or a needle valve.

[0055] In some embodiments, the microchannel reaction device may further include a heat exchange plate 50, which is attached to the side of the microchannel reaction plate 20 facing away from the gas phase plate 10. The heat exchange plate 50 has a heat exchange channel 51 and a medium inlet 52 and a medium outlet 53 respectively connected to the two ends of the heat exchange channel 51. The heat exchange channel 51 is sealed and defined by the groove on the heat exchange plate 50 and the side of the microchannel reaction plate 20. The microchannel reaction plate 20 and the heat exchange plate 50 can be sealed with a second sealing ring 55.

[0056] The function of the heat exchange plate 50 is to ensure the constant reaction temperature in the microchannel. When the chemical reaction in the microchannel is an exothermic reaction, a coolant can be introduced into the heat exchange plate 50 to promptly remove the reaction heat; when the chemical reaction in the microchannel is an endothermic reaction, hot water or heat transfer oil can be introduced into the heat exchange plate 50 to provide heat for the reaction. The flow direction of the heat exchange medium in the heat exchange plate 50 is preferably opposite to the flow direction of the medium in the microchannel to achieve a better heat exchange effect. That is, the medium inlet 52 and the medium outlet 53 of the heat exchange plate 50 correspond to the microchannel outlet 24 and the microchannel inlet 23 of the microchannel reaction plate 20, respectively (see Figure 1 ).

[0057] like Figure 6 and Figure 7 As shown, the extension mode of the heat exchange channel 51 of the heat exchange plate 50 is preferably consistent with the microchannel 22 to extend the heat exchange time and improve the heat exchange efficiency.

[0058] In some embodiments, Figure 1As shown, the microchannel reaction device may include two relatively stacked microchannel reactors, the heat exchange plate 50 is sandwiched between the two microchannel reaction plates 20, and the microchannels 22 fluids of the two microchannel reaction plates 20 are connected in series. That is to say, the microchannel reaction device includes a gas phase plate 10, a microchannel reaction plate 20, a heat exchange plate 50, a microchannel reaction plate 20, and a gas phase plate 10 stacked in sequence along a first direction. In this way, the two microchannel reactors form a series structure, and the reactants enter from the microchannel inlet 23 of the first microchannel reaction plate 20, flow out from the microchannel outlet 24 of the first microchannel reaction plate 20, and then enter the microchannel inlet 23 of the second microchannel reaction plate 20, and finally flow out from the microchannel outlet 24 of the second microchannel reaction plate 20. After completing the reaction in the previous microchannel reactor, the reactants can enter the next microchannel reactor to continue the reaction, so that the reaction is more thorough. In this case, as Figure 7 As shown, the heat exchange channel 51 of the heat exchange plate 50 may be a through groove structure, so as to simultaneously exchange heat for two microchannel reaction plates 20. Sealing grooves 54 for embedding the second sealing ring 55 may be provided on both sides of the heat exchange plate 50, respectively.

[0059] It should be noted that the gas phase plate 10, the microchannel reaction plate 20, and the heat exchange plate 50 are fixedly connected. Figure 1-Figure 7 In the embodiment shown, the gas phase plate 10, the microchannel reaction plate 20, and the heat exchange plate 50 are fixedly connected by bolts, and the gas phase plate 10, the microchannel reaction plate 20, and the heat exchange plate 50 are respectively provided with fixing holes 00 for the bolts to pass through.

[0060] A third aspect of the present invention provides a microchannel reaction method, comprising the following steps:

[0061] S1, introducing a liquid-phase reactant or a solid-liquid mixture formed by a liquid-phase reactant and a solid-phase reactant into the microchannel 22 from the microchannel inlet 23 and allowing it to flow along the microchannel 22 toward the microchannel outlet 24;

[0062] S2. During the above flow process, the gas phase reactants are continuously introduced into the microchannel 22 in the form of microbubbles in a manner of decreasing pressure along the flow direction, and are fully mixed and reacted with the liquid phase reactants or the solid-liquid mixture.

[0063] The microchannel reaction method of the present invention is different from the two existing reaction methods. It does not require the gas-liquid phase medium to be pre-mixed outside the reactor, nor is the gas and liquid introduced into the microchannel through two inlets. Instead, the liquid phase medium or the liquid-solid mixed medium is introduced into the microchannel 22 from the microchannel inlet 23. As the medium flows in the microchannel 22 toward the microchannel outlet 24, gas is continuously added. The gas enters the microchannel 22 in the form of microbubbles and is fully mixed with the liquid phase medium or the liquid-solid mixed medium, which has the advantages of good mixing effect and high reaction efficiency.

[0064] Wherein, the step S1 further comprises: grinding the solid-phase reactant into a powder with an average particle size of less than 2 μm, and premixing the powder with the liquid-phase reactant to form a solid-liquid mixture.

[0065] The present invention provides a gas-liquid-solid three-phase microchannel reaction method through the above technical scheme, so that the microchannel is suitable for gas-liquid-solid three-phase reaction, thereby filling the technical gap that the existing continuous flow microchannel reactor is not suitable for gas-liquid-solid three-phase reaction.

[0066] The microchannel reaction method of the present invention can be carried out using the microchannel reaction device of the present invention. Of course, it can also be carried out using other different reaction devices.

[0067] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed herein.

[0068] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A microchannel reactor, characterized in that: The invention comprises a gas phase plate (10) and a microchannel reaction plate (20) stacked along a first direction, wherein a plurality of mutually isolated gas phase chambers (11) are formed on a side of the gas phase plate (10) facing the microchannel reaction plate (20), and a plurality of gas inlets (12) respectively connected to the plurality of gas phase chambers (11) are provided on the gas phase plate (10); a plurality of fluid-connected microchannel areas (21) are formed on a side of the microchannel reaction plate (20) facing the gas phase plate (10), and the plurality of microchannel areas (21) are arranged in a one-to-one correspondence with the plurality of gas phase chambers (11), and the arrangement direction of the plurality of microchannel areas (21) is consistent with the flow direction of the fluid, and a microporous membrane (30) is sealed between each of the microchannel areas (21) and the corresponding gas phase chamber (11).

2. The microchannel reactor according to claim 1, characterized in that: The pore size of the microporous membrane (30) is 50-1000 nm, and / or The gas phase plate (10) or the microchannel reaction plate (20) is provided with a groove for embedding the microporous membrane (30), and the depth of the groove is consistent with the thickness of the microporous membrane (30).

3. The microchannel reactor according to claim 1 or 2, characterized in that: The plurality of microchannel areas (21) and the plurality of gas phase chambers (11) are respectively arranged along a second direction perpendicular to the first direction; the microchannels (22) on the microchannel reaction plate (20) are arranged in an intestinal shape along the second direction; and the microchannel reaction plate (20) is provided with a microchannel inlet (23) and a microchannel outlet (24) respectively connected to two ends of the microchannel (22).

4. The microchannel reactor according to claim 3, characterized in that: The plurality of air inlets (12) are arranged on a side of the gas phase plate (10) facing away from the microchannel reaction plate (20), and the air inlet direction of the air inlet (12) is consistent with the first direction.

5. A microchannel reaction device, characterized in that: It comprises an air pressure control system (40) and the microchannel reactor described in any one of claims 1 to 4, wherein the air pressure control system (40) is respectively connected to the plurality of air inlets (12) so as to respectively supply air to the plurality of gas phase chambers (11) and control the pressure of the plurality of gas phase chambers (11).

6. The microchannel reaction device according to claim 5, characterized in that: The gas pressure control system (40) is configured to make the pressure of each gas phase chamber (11) slightly greater than the sum of the corresponding fluid pressure of the microchannel region (21) and the pressure drop of the microporous membrane (30).

7. The microchannel reaction device according to claim 5 or 6, characterized in that: The air pressure control system (40) comprises an air intake manifold (41) and a plurality of air intake branch pipes (42) respectively connected to the plurality of air intake ports (12), the plurality of air intake branch pipes (42) being connected to the plurality of air intake ports (12) in a one-to-one correspondence, and each of the air intake branch pipes (42) being provided with a control valve (43) and a flow meter (44); and / or The microchannel reaction device further comprises a heat exchange plate (50), wherein the heat exchange plate (50) is attached to a side of the microchannel reaction plate (20) facing away from the gas phase plate (10).

8. The microchannel reaction device according to claim 7, characterized in that: The microchannel reaction device comprises two microchannel reactors stacked relatively to each other, the heat exchange plate (50) is sandwiched between the two microchannel reaction plates (20), and the microchannels (22) of the two microchannel reaction plates (20) are fluidly connected in series.

9. A microchannel reaction method, characterized in that: The method comprises the following steps: S1, introducing a liquid-phase reactant or a solid-liquid mixture formed by a liquid-phase reactant and a solid-phase reactant into the microchannel (22) from the microchannel inlet (23) and allowing the liquid-phase reactant to flow along the microchannel (22) toward the microchannel outlet (24); S2. During the above-mentioned flow process, the gas phase reactant is continuously introduced into the microchannel (22) in the form of microbubbles in a manner of decreasing pressure along the flow direction, and is fully mixed and reacted with the liquid phase reactant or the solid-liquid mixture.

10. The microchannel reaction method according to claim 9, characterized in that: The step S1 further comprises: grinding the solid-phase reactant into a powder with an average particle size of less than 2 μm, and premixing the powder with the liquid-phase reactant to form the solid-liquid mixed solution; and / or The method is carried out using the microchannel reaction device described in any one of claims 5-8.

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