Micro-flow field device for preparing epoxy natural rubber

Abstract

The utility model provides a micro-flow field device for preparing epoxy natural rubber, which comprises a first raw material pump, a second raw material pump, a third raw material pump, a first liquid transfer pump, a second liquid transfer pump, a first micro-flow field reactor, a second micro-flow field reactor, a fourth micro-flow field reactor, a first gas-liquid separation tank, a second gas-liquid separation tank and a reaction liquid collection tank, at least two vertical built-in baffles are arranged in reaction pipelines for reaction in the first to fourth micro-flow field reactors, and each built-in baffle is provided with at least one flow channel for fluid to penetrate through. Through the design of the reaction pipeline in the scheme, materials can be fully mixed in the reaction pipeline, the reaction efficiency is improved, the overall reaction time can be shortened through the design of equipment connection, and the reaction safety is improved.

Description

Technical Field

[0001] The utility model relates to the field of chemical reaction equipment, in particular to a microfluidic device for preparing epoxidized natural rubber. Background Art

[0002] Epoxidized natural rubber (ENR) is obtained by epoxidizing the double bonds on natural rubber. The introduction of epoxy functional groups enables natural rubber to not only retain the characteristics of "strain-induced crystallization" but also possess excellent mechanical properties, and its abrasion resistance, oil resistance, adhesiveness, and airtightness are all improved. With the increase of the degree of epoxidation, ENR has excellent airtightness, oil resistance, wet skid resistance, adhesiveness, and a relatively high glass transition temperature and other advantages.

[0003] The reaction time of the traditional kettle device is long, and the preparation process takes 6 - 8 hours. Moreover, the viscosity of the reaction system is relatively large, resulting in uneven mixing of materials. During the process of transferring materials, it will also cause poor batch stability of products between batches. At the same time, there are many by-products and potential safety risks.

[0004] Therefore, it is necessary to develop a device for preparing epoxidized natural rubber with high reaction efficiency, stable product performance, and high safety index. Summary of the Utility Model

[0005] Aiming at the defects in the prior art, the utility model provides a microfluidic device for preparing epoxidized natural rubber. The material transfer between the devices of the utility model is continuous. The gas in the system is discharged through a gas-liquid separation tank. The mixing speed and uniformity are improved through the design of the microfluidic reactor, and the reaction efficiency is improved. The reactor has a small size, a small floor area, and high safety.

[0006] The utility model provides a microfluidic device for preparing epoxidized natural rubber, which includes a first to third raw material pump, a first to second liquid transfer pump, a first to fourth microfluidic reactor, a first to second gas-liquid separation tank, and a reaction liquid collection tank;

[0007] The outlet of the first raw material pump and the outlet of the second raw material pump are both connected to the inlet of the first microfluidic reactor; the outlet of the third raw material pump and the outlet of the first microfluidic reactor are both connected to the inlet of the second microfluidic reactor;

[0008] The outlet of the second microfluidic reactor is connected to the inlet of the first gas-liquid separation tank. The liquid phase outlet of the first gas-liquid separation tank is connected to the inlet of the first liquid transfer pump. The outlet of the first liquid transfer pump is connected to the inlet of the third microfluidic reactor. The outlet of the third microfluidic reactor is connected to the inlet of the second gas-liquid separation tank. The liquid phase outlet of the second gas-liquid separation tank is connected to the inlet of the second liquid transfer pump. The outlet of the second liquid transfer pump is connected to the inlet of the fourth microfluidic reactor. The outlet of the fourth microfluidic reactor is connected to the inlet of the reaction liquid collection tank;

[0009] In the reaction pipelines for reaction in the first to fourth microfluidic reactors, there are at least two vertical built-in baffles, and each of the built-in baffles is provided with at least one flow channel for fluid to penetrate through;

[0010] Further, the number and shape of the flow channels on the built-in baffles are not limited. For example, the number of built-in baffles can be 1, 2, 3, 4 or more, and the flow channel shapes can be rectangular, triangular, circular and other shapes.

[0011] The continuity of the reaction is achieved through the connection design between devices. Compared with the batch reaction, it can avoid the instability caused by material transfer, and at the same time improve safety; the reactor for epoxidation is directly connected to the gas-liquid separation tank, which can timely remove the gas generated during the reaction, improve the reaction efficiency and safety, and extend the service life of the reactor; setting the built-in baffles with flow channels in the reactor can reduce the flow rate of the material after it enters the reactor. At the same time, the impact promotes the collision of the materials to achieve mixing. Under the impact of the built-in baffles, the contact area of the reaction materials can also be increased, the mixing speed and uniformity of the materials can be accelerated, and the reaction efficiency can be significantly improved;

[0012] Further, the first to fourth microfluidic reactors include reaction pipelines and outer shells; the reaction pipelines are arranged inside the outer shells;

[0013] The outlet of the first raw material pump and the outlet of the second raw material pump are connected to one end of the inlet of the reaction pipeline in the first microfluidic reactor;

[0014] The outlet of the third raw material pump and one end of the outlet of the reaction pipeline in the first microfluidic reactor are connected to one end of the inlet of the reaction pipeline in the second microfluidic reactor;

[0015] One end of the outlet of the reaction pipeline in the second microfluidic reactor is connected to the inlet of the first gas-liquid separation tank;

[0016] The liquid phase outlet of the first gas-liquid separation tank is connected to the inlet of the first liquid transfer pump;

[0017] The outlet of the first liquid transfer pump is connected to one end of the inlet of the reaction pipeline in the third microfluidic reactor;

[0018] One end of the outlet of the reaction pipeline in the third microfluidic reactor is connected to the inlet of the second gas-liquid separation tank;

[0019] The liquid phase outlet of the second gas-liquid separation tank is connected to the inlet of the second liquid transfer pump;

[0020] The outlet of the second liquid transfer pump is connected to one end of the inlet of the reaction pipeline in the fourth microfluidic reactor;

[0021] One end of the outlet of the reaction pipeline in the fourth microfluidic reactor is connected to the inlet of the reaction liquid collection tank.

[0022] Furthermore, the cross-section of the reaction pipeline is circular; one end of the reaction pipeline is provided with the inlet, and the other end is provided with the outlet; the built-in baffles are arranged at intervals in the reaction pipeline; the outer side surface of the built-in baffle is fixed to the inner wall of the reaction pipeline;

[0023] The diameter of the reaction pipeline is 1 - 30 mm, the length is 10 - 300 mm, and the thickness is 1 - 5 mm;

[0024] Optionally, the reaction pipeline is provided with a first inlet and a second inlet, and the second inlet is arranged at one end close to the first inlet.

[0025] Furthermore, the built-in baffle is of a cylindrical structure, with a diameter of 1 - 30 mm and a height of 1 - 10 mm.

[0026] Furthermore, the flow channels between two adjacent built-in baffles are staggered;

[0027] The flow channels of the built-in baffles can increase the fluid disturbance. The staggered arrangement can significantly increase the contact area of the materials between adjacent built-in baffles, and at the same time increase the residence time of the materials in the reaction pipeline, enabling the materials to react fully.

[0028] Furthermore, the number of built-in baffles in the reaction pipeline is 2 - 40; the distance between two adjacent built-in baffles is 2 - 20 mm.

[0029] Furthermore, pressure gauges, valves and flow meters are arranged at intervals on the connecting pipelines between the first to third raw material pumps and the first to second microfluidic reactors.

[0030] Furthermore, the first to fourth microfluidic reactors are respectively provided with an electric temperature control system for controlling the temperature inside the first to fourth microfluidic reactors.

[0031] Further, the microfluidic device further includes: a third gas-liquid separation tank; the outlet of the fourth microfluidic reactor is connected to the inlet of the third gas-liquid separation tank, and the liquid-phase outlet of the third gas-liquid separation tank is connected to the inlet of the reaction liquid collection tank;

[0032] The inlet of the reaction liquid collection tank is at a lower horizontal height than the outlet of the fourth microfluidic reactor.

[0033] Further, the outlet end of the reaction pipeline in the fourth microfluidic reactor is connected to the inlet of the third gas-liquid separation tank.

[0034] Further, the microfluidic device is also provided with a first bracket and a second bracket; the first to fourth microfluidic reactors are all horizontally fixed on the first bracket;

[0035] The first to third raw material pumps are all fixedly arranged on the second bracket, and the height of the first bracket is greater than the height of the second bracket.

[0036] Further, the first to third raw material pumps are all connected to external raw material storage tanks.

[0037] In summary, compared with the prior art, the present utility model achieves the following technical effects:

[0038] In the solution proposed by the present utility model, the reaction pipeline in the microfluidic reactor contains a vertical cylindrical internal baffle structure, which can promote the mixing of reaction raw materials. The flow channels on the internal baffle can increase the contact area between reactants, achieving better mixing and reaction effects;

[0039] Further, in the solution proposed by the present utility model, the flow channels between adjacent internal baffles in the reaction pipeline of the microfluidic reactor are staggered from each other, which can increase the residence time of the material in the reaction pipeline and enable the reaction to proceed fully;

[0040] Moreover, in the solution proposed by the present utility model, the raw material pump, the microfluidic reactor, the gas-liquid separation tank and the reaction liquid collection tank are connected in sequence, which can effectively ensure the reaction safety and reaction efficiency;

[0041] Therefore, the present utility model provides a microfluidic device for preparing epoxidized natural rubber. Through the internal baffle design of the reaction pipeline in the microfluidic reactor in this solution and the connection between devices, it is ensured that the epoxidation reaction can proceed fully and evenly, and at the same time, the reaction efficiency can be significantly improved and the reaction safety can be enhanced. Description of the Drawings

[0042] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the attached drawings required for use in the embodiments. It should be understood that the following attached drawings only show certain embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant attached drawings can also be obtained based on these attached drawings.

[0043] Figure 1 Schematic diagram of the overall structure provided for Embodiment 1 of the present utility model;

[0044] Figure 2 Schematic diagram of the structure of the reaction pipeline in the microfluidic reactor of the present utility model;

[0045] Figure 3 Schematic diagram of the structure of the built-in baffle in the reaction pipeline of the present utility model;

[0046] Figure 4 Homogeneous mixing effect diagram obtained by CFD calculation simulation of the materials in the reaction pipeline of the device of Embodiment 1 of the present utility model.

[0047] Reference numerals

[0048] 1 - First raw material pump; 2 - Second raw material pump; 3 - Third raw material pump; 4 - First microfluidic reactor; 5 - Second microfluidic reactor; 6 - First gas-liquid separation tank; 7 - First liquid transfer pump; 8 - Third microfluidic reactor; 9 - Second gas-liquid separation tank; 10 - Second liquid transfer pump; 11 - Fourth microfluidic reactor; 12 - Third gas-liquid separation tank; 13 - Reaction liquid collection tank; 14 - First support; 15 - Second support; 41 - Reaction pipeline; 42 - Built-in baffle; 411 - First inlet of the reaction pipeline; 412 - Second inlet of the reaction pipeline; 413 - Outlet of the reaction pipeline; 421 - Flow channel. Specific embodiments

[0049] In order to enable those skilled in the art to better understand the solutions of the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0050] Hereinafter, various embodiments of the present utility model will be described more comprehensively. The present utility model can have various embodiments, and adjustments and changes can be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present utility model to the specific embodiments disclosed herein, but the present utility model should be understood to cover all adjustments, equivalents and / or alternative solutions that fall within the spirit and scope of the various embodiments of the present utility model.

[0051] Hereinafter, the term "comprising" or "may comprise" that can be used in various embodiments of the present utility model indicates the presence of the disclosed functions, operations or elements, and does not limit the addition of one or more functions, operations or elements. In addition, as used in various embodiments of the present utility model, the terms "comprising", "having" and their cognates are only intended to indicate a specific feature, number, step, operation, element, component or combination of the foregoing items, and should not be construed as precluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0052] In various embodiments of the present utility model, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the listed words. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0053] Expressions (such as "first", "second", etc.) used in various embodiments of the present utility model may modify various components in various embodiments, but do not limit the corresponding components. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of various embodiments of the present utility model, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0054] It should be noted that in the present utility model, unless otherwise clearly specified and defined, terms such as "install", "connect", "fix", etc. 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 an indirect connection through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0055] In the present utility model, those of ordinary skill in the art need to understand that the terms indicating orientation or positional relationship in the text are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0056] The terms used in the various embodiments of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the various embodiments of the present utility model. As used herein, the singular form is also intended to include the plural form unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the various embodiments of the present utility model belong. The terms (such as those defined in a general use dictionary) will be construed to have the same meaning as the contextual meaning in the relevant technical field and will not be construed to have an idealized meaning or an overly formal meaning unless clearly defined in the various embodiments of the present utility model.

[0057] Embodiment 1

[0058] Embodiment 1 discloses a microfluidic device for preparing epoxidized natural rubber, as Figure 1 shown, which includes a first raw material pump 1, a second raw material pump 2, a third raw material pump 3, a first microfluidic reactor 4, a second microfluidic reactor 5, a first gas-liquid separation tank 6, a first liquid transfer pump 7, a third microfluidic reactor 8, a second gas-liquid separation tank 9, a second liquid transfer pump 10, a fourth microfluidic reactor 11, a third gas-liquid separation tank 12, and a reaction liquid collection tank 13;

[0059] The outlet of the first raw material pump 1 and the outlet of the second raw material pump 2 are both connected to the inlet of the first microfluidic reactor 4; the outlet of the third raw material pump 3 and the outlet of the first microfluidic reactor 4 are both connected to the inlet of the second microfluidic reactor 5; the outlet of the second microfluidic reactor 5 is connected to the inlet of the first gas-liquid separation tank 6, the liquid phase outlet of the first gas-liquid separation tank 6 is connected to the first liquid transfer pump 7, the outlet of the first liquid transfer pump 7 is connected to the inlet of the third microfluidic reactor 8, the outlet of the third microfluidic reactor 7 is connected to the inlet of the second gas-liquid separation tank 9, the liquid phase outlet of the second gas-liquid separation tank 9 is connected to the second liquid transfer pump 10, the outlet of the second liquid transfer pump 10 is connected to the inlet of the fourth microfluidic reactor 11, the outlet of the fourth microfluidic reactor 11 is connected to the third gas-liquid separation tank 12, and the liquid phase flows by gravity into the inlet of the reaction liquid collection tank 13; the connection between the devices can promote the continuous transfer of materials during the product preparation process, improve the reaction efficiency while enhancing the reaction safety.

[0060] As Figure 2, in the reaction pipelines 41 for reactions in the first microfluidic reactor 4, the second microfluidic reactor 5, the third microfluidic reactor 8, and the fourth microfluidic reactor 11, there are at least two vertical built-in baffles 42, such as Figure 3 , each built-in baffle 42 is provided with at least one flow channel 421 for fluid to penetrate through. The shape of the flow channel can optionally be rectangular, triangular, circular, etc., and the size of the flow channel is not limited. After the materials enter the reaction pipeline 41, they will generate a certain impact on the built-in baffle 42. At this time, the mixing speed of different materials will be accelerated due to the impact force. The mixed materials will be further mixed evenly through the staggered flow channels 421. While continuously increasing the contact area between the materials, the reaction rate can be accelerated. Moreover, the built-in baffle 42 and the staggered flow channels 421 will also enhance the collision between the materials and prolong the residence time of the materials in the reaction pipeline 41, making the reaction proceed more fully.

[0061] The structures of the first to fourth microfluidic reactors are similar. Taking the first microfluidic reactor 4 as an example, such as Figure 2 , the cross-section of the reaction pipeline 41 is circular, with a diameter of 10 mm, a length of 160 mm, and a thickness of 1 mm. The reaction tube 41 includes a first inlet 411, a second inlet 412, and an outlet 413. There are 8 vertical built-in baffles 42 in the reaction pipeline 41. The built-in baffle 42 is a cylindrical structure, with a diameter of 10 mm and a height of 5 mm. The outer side of the built-in baffle 42 is fixed to the inner wall of the reaction pipeline 41, and the flow channels of adjacent built-in baffles 42 are staggered; such as Figure 3 , the built-in baffle 42 is provided with 2 flow channels 421 for fluid to penetrate through. The shape of the flow channel 421 is rectangular, with a length of 6 mm and a width of 2 mm.

[0062] Furthermore, the first microfluidic reactor 4, the second microfluidic reactor 5, the third microfluidic reactor 8, and the fourth microfluidic reactor 11 include a reaction pipeline 41 and a housing. The reaction pipeline 41 is arranged inside the housing. The shape of the housing can optionally be cylindrical. Among them, the reaction pipeline 41 can be fixed in the housing in a coiled manner, and the fixing method is not limited. For example, it can be directly welded and fixed, flange-connected and fixed, groove-connected and fixed, supported by a bracket and fixed, etc.;

[0063] Further, the outlet of the first raw material pump 1 is connected to the inlet end of the reaction pipeline 41 in the first microfluidic reactor 4 together with the outlet of the second raw material pump 2; the outlet of the third raw material pump 3 is connected to the inlet end of the reaction pipeline 41 in the second microfluidic reactor 5 together with the outlet end of the reaction pipeline 41 in the first microfluidic reactor 4; the outlet end of the reaction pipeline 41 in the second microfluidic reactor 5 is connected to the inlet of the first gas-liquid separation tank 6; the liquid phase outlet of the first gas-liquid separation tank 6 is connected to the first liquid transfer pump 7, and the first liquid transfer pump 7 is connected to the inlet end of the reaction pipeline 41 in the third microfluidic reactor 8; the outlet end of the reaction pipeline 41 in the third microfluidic reactor 8 is connected to the inlet of the second gas-liquid separation tank 9; the liquid phase outlet of the second gas-liquid separation tank 9 is connected to the second liquid transfer pump 10, and the second liquid transfer pump 10 is connected to the inlet end of the reaction pipeline 41 in the fourth microfluidic reactor 11; the outlet end of the reaction pipeline 41 in the fourth microfluidic reactor 11 is connected to the inlet of the reaction liquid collection tank 13. The first raw material pump 1, the second raw material pump 2, and the third raw material pump 3 are all connected to external storage tanks. The outlet of the first raw material pump 1 and the outlet of the second raw material pump 2 can be respectively connected to the first inlet 411 and the second inlet 412 of the reaction pipeline 41 in the first microfluidic reactor 4, or the outlet pipeline of the first raw material pump 1 and the outlet pipeline of the second raw material pump 2 can be connected to the inlet pipeline of the first microfluidic reactor 4 after passing through a tee. The connection method between the pipelines is not limited, such as it can be threaded connection, welded connection, flange connection, hot melt connection, socket connection, etc.;

[0064] Further, the cross-section of the reaction pipeline 41 is circular. One end of the reaction pipeline 41 is provided with an inlet, and the inlet can be optionally one or more. The other end is provided with an outlet. The built-in baffle 42 is arranged at intervals in the reaction pipeline 41, and the outer side surface of the built-in baffle 42 is fixed to the inner wall of the reaction pipeline 41;

[0065] Further, the diameter of the reaction pipeline 41 is 1 - 30 mm, the length is 10 - 300 mm, and the thickness is 1 - 5 mm. When the size of the reaction pipeline 41 is within this range, it can not only promote the mixing and dispersion of materials, shorten the mixing time, cooperate with the design of the built-in baffle 42 to strengthen the impact effect of the materials, but also avoid the generation of concentration gradient and flow dead zone. The improvement of the mixing efficiency helps the materials to contact and react more fully, thereby increasing the reaction rate and yield. And because the concentration is uniform, it can also maintain the reaction temperature, reduce the occurrence of side reactions, and improve the yield and purity of the target product.

[0066] Further, the built-in baffle 42 is a cylindrical structure with a diameter of 1 - 30 mm and a height of 1 - 10 mm. The design of the built-in baffle 42 helps to increase the turbulence degree of the materials in the reaction pipeline 41 and promote the uniform distribution of the fluid in the pipeline. Keeping the size of the built-in baffle 42 within an appropriate range helps to optimize the overall performance of the reaction pipeline 41, improve the process efficiency and product quality.

[0067] Furthermore, the flow channels 421 of two adjacent built-in baffles 42 are staggered from each other. The staggering of the flow channels 421 causes a greater impact on the material when the material passes through two adjacent built-in baffles 42, increasing the contact area of the material and avoiding the generation of flow dead zones between the built-in baffles 42, thereby improving the conversion rate of the reaction material.

[0068] Furthermore, the number of built-in baffles 42 in the reaction pipe 41 is 2 - 40, such as 2, 4, 6, 8, 10, 16, 24, 30, 36, 40, and the distance between two adjacent built-in baffles 42 is 2 - 20 mm.

[0069] Furthermore, pressure gauges for monitoring pressure are provided at intervals on the connecting pipes between the first raw material pump 1, the second raw material pump 2, the third raw material pump 3, the first microfluidic reactor 4, and the second microfluidic reactor 5, which can ensure the stable operation of the pipeline system during the entire production process, avoid failures or accidents caused by abnormal pressure, and valves and flow meters for regulating and controlling the fluid flow are also provided, which can not only maintain the stability of the production process, but also ensure the quality stability of the product and extend the service life of the equipment.

[0070] Furthermore, electric temperature control systems for controlling the temperature inside the first to fourth microfluidic reactors are respectively provided on the first microfluidic reactor 4, the second microfluidic reactor 5, the third microfluidic reactor 8, and the fourth microfluidic reactor 11.

[0071] Furthermore, the microfluidic device further includes: a third gas-liquid separation tank 12. The outlet of the fourth microfluidic reactor 11 is connected to the inlet of the third gas-liquid separation tank 12, and the liquid phase outlet of the third gas-liquid separation tank 12 is connected to the inlet of the reaction liquid collection tank 13; the inlet level of the reaction liquid collection tank 13 is lower than the outlet level of the fourth microfluidic reactor 11.

[0072] Furthermore, the microfluidic device is also provided with a first support 14 and a second support 15. The first microfluidic reactor 4, the second microfluidic reactor 5, the third microfluidic reactor 8, and the fourth microfluidic reactor 11 are all horizontally fixed on the first support 14. The first support 14 is designed with adjustable feet (not shown in the figure) for horizontal adjustment on different work surfaces to ensure the stable operation of the reactor;

[0073] Furthermore, the first raw material pump 1, the second raw material pump 2, and the third raw material pump 3 are all fixedly arranged on the second support 15. The second support 15 is designed with an adjustable base (not shown in the figure). The height of the first support 14 is greater than the height of the second support 15. By adjusting the horizontal heights of the first support 14 and the second support 15, the stable progress of the reaction can be maintained.

[0074] Therefore, when using the microfluidic reaction device of epoxy natural rubber proposed in this embodiment, after the reaction materials enter the reaction pipe 41, the mixing of the materials is promoted by impacting the built-in baffle 42, the reaction contact area is increased, and the reaction efficiency is improved. For the homogeneous mixing effect of the materials in the reaction pipe 41, see Figure 4 , the light-colored part in the figure is the mixing area. It can be seen that light gray with good mixing appears from the middle section of the reaction pipe, and it is almost completely mixed at the outlet, indicating that the mixing effect of this reaction pipe is good and it is suitable for strengthening liquid mixing; the process of the material from the raw material pump to the reaction liquid collection tank is continuous, which can shorten the overall reaction time and improve the reaction safety.

[0075] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A microfluidic device for preparing epoxidized natural rubber, characterized in that, It includes a first to a third raw material pump, a first to a second liquid transfer pump, a first to a fourth microfluidic reactor, a first to a second gas-liquid separation tank, and a reaction liquid collection tank; The outlet of the first raw material pump and the outlet of the second raw material pump are both connected to the inlet of the first microfluidic reactor; the outlet of the third raw material pump and the outlet of the first microfluidic reactor are both connected to the inlet of the second microfluidic reactor; The outlet of the second microfluidic reactor is connected to the inlet of the first gas-liquid separation tank, the liquid phase outlet of the first gas-liquid separation tank is connected to the inlet of the first liquid transfer pump, the outlet of the first liquid transfer pump is connected to the inlet of the third microfluidic reactor, the outlet of the third microfluidic reactor is connected to the inlet of the second gas-liquid separation tank, the liquid phase outlet of the second gas-liquid separation tank is connected to the inlet of the second liquid transfer pump, the outlet of the second liquid transfer pump is connected to the inlet of the fourth microfluidic reactor, and the outlet of the fourth microfluidic reactor is connected to the inlet of the reaction liquid collection tank; In the reaction pipeline for reaction in the first to fourth microfluidic reactors, there are at least two vertical built-in baffles, and each of the built-in baffles is provided with at least one flow channel for fluid to penetrate through.

2. The microfluidic device according to claim 1, characterized in that, The first to fourth microfluidic reactors include a reaction pipeline and a housing; the reaction pipeline is arranged inside the housing; The outlet of the first raw material pump and the outlet of the second raw material pump are connected to one end of the inlet of the reaction pipeline in the first microfluidic reactor; The outlet of the third raw material pump and one end of the outlet of the reaction pipeline in the first microfluidic reactor are connected to one end of the inlet of the reaction pipeline in the second microfluidic reactor; One end of the outlet of the reaction pipeline in the second microfluidic reactor is connected to the inlet of the first gas-liquid separation tank; The liquid phase outlet of the first gas-liquid separation tank is connected to the inlet of the first liquid transfer pump; The outlet of the first liquid transfer pump is connected to one end of the inlet of the reaction pipeline in the third microfluidic reactor; One end of the outlet of the reaction pipeline in the third microfluidic reactor is connected to the inlet of the second gas-liquid separation tank; The liquid phase outlet of the second gas-liquid separation tank is connected to the inlet of the second liquid transfer pump; The outlet of the second liquid transfer pump is connected to one end of the inlet of the reaction pipeline in the fourth microfluidic reactor; One end of the outlet of the reaction pipeline in the fourth microfluidic reactor is connected to the inlet of the reaction liquid collection tank.

3. The microfluidic device according to claim 2, wherein, The cross-section of the reaction pipeline is circular; one end of the reaction pipeline is provided with the inlet, and the other end is provided with the outlet; the built-in baffles are arranged at intervals in the reaction pipeline; the outer side surface of the built-in baffle is fixed to the inner wall of the reaction pipeline; The diameter of the reaction pipeline is 1 - 30 mm, the length is 10 - 300 mm, and the thickness is 1 - 5 mm.

4. The microfluidic device according to claim 1 or 3, characterized in that, The built-in baffle is in a cylindrical structure, with a diameter of 1 - 30 mm and a height of 1 - 10 mm.

5. The microfluidic device according to claim 1 or 3, characterized in that, The flow channels of two adjacent built-in baffles are staggered from each other.

6. The microfluidic device according to claim 1 or 3, characterized in that The number of built-in baffles in the reaction pipeline is 2 - 40; the distance between two adjacent built-in baffles is 2 - 20 mm.

7. The microfluidic device according to claim 1, wherein, On the connecting pipeline between the first to third raw material pumps and the first to second microfluidic reactors, pressure gauges, valves, and flow meters are arranged at intervals.

8. The microfluidic device according to claim 1, wherein An electric temperature control system for controlling the temperature inside the first to fourth microfluidic reactors is respectively provided on the first to fourth microfluidic reactors.

9. The microfluidic device according to claim 1, wherein It further includes: A third gas-liquid separation tank; the outlet of the fourth microfluidic reactor is connected to the inlet of the third gas-liquid separation tank, and the liquid phase outlet of the third gas-liquid separation tank is connected to the inlet of the reaction liquid collection tank; The inlet level of the reaction liquid collection tank is lower than the outlet level of the fourth microfluidic reactor.

10. The microfluidic device according to claim 1, wherein A first support and a second support are also provided; the first to fourth microfluidic reactors are all horizontally fixed on the first support; The first to third raw material pumps are all fixedly arranged on the second support, and the height of the first support is greater than the height of the second support.

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