A 3,3-dimethyl acrylic acid synthesis mixed type reaction kettle

Abstract

This utility model relates to the field of chemical equipment technology and discloses a mixing reactor for the synthesis of 3,3-dimethylacrylic acid. It includes a support frame, a heat-insulating vessel fixed to the upper end of the support frame, an injection pipe fixed to the heat-insulating vessel, a liquid inlet mechanism for injecting liquid into the injection pipe, a gas inlet mechanism for injecting gas into the injection pipe, a first feeding mechanism at the upper end of the heat-insulating vessel, a feeding cylinder at the end away from the injection pipe, a feeding mechanism on the feeding cylinder, a second feeding mechanism on the feeding cylinder, a stirring mechanism on the feeding mechanism, multiple connecting blocks fixed to the top surface of the inner wall of the heat-insulating vessel, a sealed container fixed to the lower end of the multiple connecting blocks, a scraping mechanism on the sealed container for scraping the outer wall of the central cylinder, and a central cylinder fixed to the outer wall of the outlet end of the feeding cylinder. This utility model has the advantages of high mixing efficiency, effective prevention of solid deposition and equipment blockage, and ease of cleaning and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a mixed reaction vessel for the synthesis of 3,3-dimethylacrylic acid. Background Technology

[0002] 3,3-Dimethylacrylic acid is an important organic chemical intermediate widely used in pharmaceuticals, pesticides, fragrances, and polymer materials. Its synthesis typically involves a multiphase reaction of solid raw materials, liquid reagents, and possibly gas-phase components, requiring high levels of homogeneity in the reaction system, efficient mass transfer, and precise temperature control. Currently, this synthesis reaction is mostly carried out in conventional stirred tank reactors, relying on mechanical stirring to achieve material mixing.

[0003] However, in existing reaction equipment, conventional stirring often fails to prevent the sedimentation and local accumulation of solid materials when mixing solid particles and liquid media. This results in limited reaction contact area, low mass transfer efficiency, and affects reaction rate and conversion rate. Secondly, during the reaction, solid materials easily adhere to or accumulate on the reactor inner wall, stirring shaft, and impeller, causing blockages, affecting flow and mixing, and increasing the difficulty of post-reaction cleaning, which is detrimental to continuous operation of the equipment. In addition, existing reactors typically use separate feeding methods when precise control of liquid and gas feed is required, making it difficult to achieve real-time and uniform dispersion and mixing of the two. Especially when gas needs to penetrate into high-viscosity or solid particle-containing reaction media, uneven bubble distribution and insufficient contact between the gas, liquid, and solid phases can easily occur, thus affecting reaction selectivity and product purity.

[0004] Therefore, there is an urgent need to develop a dedicated reaction apparatus that can achieve efficient and uniform mixing of solid, liquid and gaseous materials, prevent solid deposition and blockage, and is easy to operate and clean, so as to meet the requirements of mixing efficiency and reaction control precision in the synthesis process of 3,3-dimethylacrylic acid. Utility Model Content

[0005] The purpose of this invention is to provide a mixing reactor for the synthesis of 3,3-dimethylacrylic acid, which has the advantages of high mixing efficiency, effective prevention of solid deposition and equipment blockage, and easy cleaning and maintenance, thus solving the problems in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A 3,3-dimethylacrylic acid synthesis mixing reactor includes a support frame, a heat-insulating vessel fixed to the upper end of the support frame, an injection pipe fixed to the heat-insulating vessel, a liquid inlet mechanism for injecting liquid into the injection pipe, a gas inlet mechanism for injecting gas into the injection pipe, a first feeding mechanism at the upper end of the heat-insulating vessel, a feeding cylinder at the end away from the injection pipe, a feeding mechanism on the feeding cylinder, a second feeding mechanism on the feeding cylinder, a stirring mechanism on the feeding mechanism, multiple connecting blocks fixed to the top surface of the inner wall of the heat-insulating vessel, a sealed container fixed to the lower end of the multiple connecting blocks, a scraping mechanism on the sealed container for scraping the outer peripheral wall of the central cylinder, and a central cylinder fixed to the outer wall of the outlet end of the feeding cylinder. The end of the central cylinder facing the injection pipe is open, the central cylinder is located inside the sealed container, and multiple through holes are opened through the outer peripheral wall of the central cylinder.

[0008] A central tube is fixed to the inner wall of the output end of the injection tube. The output end of the central tube passes through one end of the sealed container and extends into the interior of the sealed container.

[0009] The output end of the central tube faces the center of the stirring mechanism, and the lower end of the sealed tank is equipped with a discharge mechanism.

[0010] Preferably, the liquid inlet mechanism includes a support plate disposed outside the support, a water pump fixed to the upper end of the support plate, and a water tank disposed outside the support. The pumping end of the water pump is connected to the outlet end of the water tank through a pipe. An inlet pipe is fixedly connected through the outer peripheral wall of the injection pipe. A first valve body is provided on the inlet pipe. The outlet end of the water pump is connected to the inlet end of the first valve body through a pipe.

[0011] It is worth noting that by using an external, independent water tank and pump, the required liquid can be pre-stored and stably delivered, avoiding pressure fluctuations or uneven flow that may occur when directly injecting from a high-level tank or pipeline. The stable pressure provided by the pump ensures that the liquid can overcome pipeline resistance and smoothly pass through the inlet pipe and the first valve body into the injection pipe and the central pipe, and is finally accurately delivered to the core reaction zone inside the sealed tank. This design not only improves the automation and ease of operation of the feeding process, but more importantly, the stable liquid flow helps to form a homogeneous mixing environment with solid and gaseous materials, providing a basic condition for the subsequent efficient three-phase reaction. It avoids the problem of local concentrations being too high or too low due to unstable liquid feeding, thereby ensuring the stability of the reaction process and the uniformity of product quality.

[0012] Preferably, the air intake mechanism includes an air pump disposed outside the bracket and an air intake pipe fixed to the air outlet end of the air pump. The air outlet end of the air intake pipe is fixed to the outer peripheral wall of the injection pipe through the air intake pipe, and a solenoid valve is provided on the air intake pipe.

[0013] It is worth noting that, by providing a stable gas source through a gas pump and precisely controlling the gas inlet pipe and solenoid valve, the gas is not introduced from the top or side wall of the reactor, but rather flows into the injection pipe and is directly injected into the core reaction area inside the sealed tank through a central pipe penetrating the end of the sealed tank. The outlet of the central pipe faces the high-speed rotating stirring mechanism, causing the gas to be immediately broken into tiny bubbles by strong mechanical shear force upon entry. This method greatly increases the contact area between the gas and liquid phases and ensures that the bubbles can be uniformly dispersed in the reaction medium containing solid particles. This not only significantly enhances the mass transfer process and accelerates the dissolution and reaction of gaseous reactants, but also effectively prevents bubbles from escaping or coalescing at the liquid surface, thereby greatly improving the efficiency, selectivity, and completeness of the gas-liquid-solid three-phase reaction.

[0014] Preferably, the first feeding mechanism includes a first feeding pipe that is fixedly connected to the upper end of the insulated vessel and a second valve body disposed on the first feeding pipe. A second fixing ring is fixedly connected to the lower part of the inner wall of the first feeding pipe, and a discharge pipe is fixedly connected to the lower end of the second fixing ring. The lower end of the discharge pipe passes through the upper end of the sealed container and extends to the inner wall of the sealed container.

[0015] It is worth noting that the combination of the first feed pipe and the second valve body enables manual or automatic control of the timing and flow rate of the first material addition. The key improvement lies in the structure of the feed pipe: supported by the second fixing ring, the feed pipe extends from the bottom of the first feed pipe, passes directly through the top wall of the sealed tank, and penetrates into its internal space. This design allows the material to bypass the interlayer area between the insulated vessel and the sealed tank and be directly and accurately delivered to the predetermined reaction area inside the sealed tank. This effectively avoids the material from sticking, pre-reacting, or being lost to the vessel wall or other cold areas before entering the main reaction zone. The guiding effect of the feed pipe ensures that the material can contact the existing mixture in the sealed tank more quickly and in a more concentrated manner, shortening the time required for uniform mixing. This is particularly beneficial for synthesis processes that are sensitive to the feeding location or require stepwise feeding.

[0016] Preferably, the feeding mechanism includes a motor fixed to the end of the feeding cylinder away from the center of the insulated kettle, a rotating rod rotatably mounted on the inner wall of one end of the feeding cylinder, and an auger fixed to the outer peripheral wall of the rotating rod. The output shaft of the motor passes through the feeding cylinder and is fixed to one end of the rotating rod.

[0017] It is worth noting that the motor-driven rotating rod and the auger fixed to it rotate, transforming the passive stirring of the traditional reactor into active axial conveying. When solid materials or high-density slurries are added to the feed cylinder from the second feeding mechanism, the rotating auger generates a strong axial thrust, continuously pushing these materials towards the opening of the central cylinder located inside the sealed tank, just like a screw. This process forcibly breaks the natural accumulation state of solid materials at the bottom or near the feed inlet due to gravity, ensuring that solid components can be uniformly and continuously introduced into the main reaction zone. Compared with the scheme relying solely on radial stirring blades, the auger has a stronger axial conveying capacity, effectively handling materials that are prone to settling and agglomeration, preventing blockage of the conveying pipes or feed inlet, and providing a reliable mechanical guarantee for achieving uniform concentration of solid components and long-term stable reaction within the reaction system.

[0018] Preferably, the second feeding mechanism includes a second feeding pipe fixed to the upper end of the feeding cylinder and a third valve body disposed on the second feeding pipe.

[0019] It is worth noting that this mechanism allows operators to add a second solid raw material, catalyst, or another liquid material into the feed cylinder through the second feed pipe and the third valve body. Its advantage lies in enabling the separate and time-based addition of materials, meeting the sequential or concurrent feeding requirements commonly found in complex synthesis processes. The added material immediately enters the range of the feeding mechanism, is conveyed by the auger, and undergoes preliminary mixing with materials from the first feed mechanism or those already present in the system during transport. This design allows different materials to begin contact and mixing before entering the core reaction zone of the sealed tank, optimizing the reaction process and controlling side reactions. Furthermore, as a supplementary feed port, it facilitates replenishment or addition of additives during the reaction process without opening the main reactor, improving operational safety and convenience, and enabling the reactor to adapt to a wider range of process conditions.

[0020] Preferably, the stirring mechanism includes a plurality of first fixing rings fixed to the outer peripheral wall of the rotating rod and a plurality of stirring blocks fixed to the outer peripheral wall of each first fixing ring.

[0021] It is worth noting that multiple first fixed rings are distributed along the axial direction of the rotating rod, and each ring has multiple stirring blocks evenly distributed circumferentially. When the rotating rod is driven to rotate by the motor, these stirring blocks will work simultaneously at different heights and radial positions inside the sealed tank. This structure can disperse the gas injected from the central tube, shear the droplets or solid clumps falling from the feed pipe, and strongly agitate the gas-liquid-solid mixture flowing out from the central cylinder opening. The resulting flow field is complex and full of turbulence, which can realize the macroscopic circulation of reactants in the tank and provide sufficient microscopic mixing intensity to ensure full contact of each component at the molecular scale. The multi-layer stirring block setting eliminates mixing dead zones and minimizes the material concentration and temperature gradient in each region of the sealed tank. This creates a near-ideal kinetic environment for multiphase reactions such as the synthesis of 3,3-dimethylacrylic acid, which require high mixing intensity, and directly contributes to improving the reaction rate and product uniformity.

[0022] Preferably, the scraping mechanism includes an electric cylinder and a moving ring. The electric cylinder is fixedly connected to the end of the sealed tank away from the motor. The output shaft of the electric cylinder passes through the sealed tank and is fixedly connected to the moving ring. The outer peripheral wall of the moving ring is in contact with the inner wall of the sealed tank, and the inner wall of the moving ring is in contact with the outer peripheral wall of the central cylinder.

[0023] It is worth noting that the electric cylinder can precisely control the reciprocating motion of the moving ring along the central cylinder axis. The moving ring adopts a contour-following design that fits tightly against the inner wall of the sealed tank and the outer wall of the central cylinder. During its movement, it acts like a "scraper," continuously scraping away reactants, byproducts, or crystalline solids adhering to the outer wall of the central cylinder and the inner wall of the sealed tank. This ensures the long-term effectiveness of the material circulation channels inside and outside the sealed tank, which is the basis for maintaining the forced circulation mixing mode. Secondly, it removes the heat insulation scale layer that affects heat transfer efficiency, ensuring precise control of the reaction temperature by the insulated kettle. This greatly reduces the burden of manual cleaning after the reaction, avoids equipment disassembly and maintenance due to severe scaling, significantly improves the online operating time, production continuity, and service life of the equipment, and reduces maintenance costs.

[0024] Preferably, the discharge mechanism includes a liquid discharge pipe that is fixedly connected to the lower end of the sealed tank and a fourth valve body disposed on the liquid discharge pipe. The lower end of the liquid discharge pipe passes through the lower end of the heat preservation vessel and extends to the bottom of the heat preservation vessel.

[0025] It is worth noting that the liquid outlet pipe is directly fixed to the lowest point of the sealed tank and its opening and closing are controlled by the fourth valve body. Under the circulation action of the stirring mechanism, the mixture (including liquid and solid particles) after the reaction is completed will converge to the bottom of the sealed tank with the fluid movement. Since the liquid outlet pipe is located at the lowest point and is the only outlet, under the combined action of gravity and fluid dynamics, most of the material can be guided and discharged through the liquid outlet pipe. This design minimizes the residue and retention of reaction products in the bottom corners or side walls of the tank, which not only improves the yield of single batch products and reduces material waste, but more importantly, creates clean starting conditions for the next batch of production and avoids cross-contamination between batches. This is especially important for fine chemical synthesis with high product purity requirements. At the same time, the simple bottom direct outlet structure also facilitates connection to downstream receiving or processing equipment.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] 1. This utility model uses the auger in the feeding mechanism to rotate under the drive of the motor, which can push solid materials axially and forcibly from the feeding cylinder to the reaction core area inside the sealed tank, breaking the natural settling and accumulation state of solid particles caused by gravity, ensuring that the solid components participate in the reaction continuously and uniformly, thereby significantly improving the solid-liquid contact area and reaction rate.

[0028] 2. The gas inlet mechanism delivers the gas directly to the high-speed stirring zone inside the sealed tank through the central tube. The gas jet is immediately sheared and crushed into a large number of tiny bubbles by the high-speed rotating stirring block, and evenly dispersed in the reaction medium containing solid particles. This "deep into the core and instant dispersion" method greatly enhances the mass transfer process of the gas-liquid-solid three phases and improves the gas utilization rate and reaction selectivity.

[0029] 3. The scraping mechanism is driven by an electric cylinder to move the ring back and forth along the outer wall of the central cylinder and the inner wall of the sealed tank. It can remove reactants or by-products adhering to the wall surface online and automatically. This mechanism effectively prevents the impact of material scaling on the flow of through holes and heat transfer efficiency, fundamentally avoids the risk of blockage, ensures the long-term stable operation and efficient heat transfer of the reaction system, and greatly reduces the difficulty and intensity of manual cleaning. Attached Figure Description

[0030] Figure 1 The diagram shown is a three-dimensional structural schematic of this utility model;

[0031] Figure 2 The diagram shown is a three-dimensional structural schematic of the first feeding mechanism of this utility model.

[0032] Figure 3 The diagram shown is a three-dimensional structural schematic of the second feeding mechanism of this utility model;

[0033] Figure 4 The diagram shown is a three-dimensional cross-sectional view of the present invention.

[0034] Figure 5 The diagram shown is a three-dimensional structural schematic of the material discharge mechanism of this utility model.

[0035] Reference numerals: 1. Support; 2. Insulated kettle; 3. Injection pipe; 4. Liquid inlet pipe; 5. First valve body; 6. Air inlet pipe; 61. Solenoid valve; 7. Air pump; 8. Support plate; 9. Water pump; 10. Water tank; 11. First feed pipe; 12. Second valve body; 13. Feed cylinder; 14. Motor; 15. Second feed pipe; 16. Third valve body; 17. Rotating rod; 18. Screwdriver; 19. Central cylinder; 20. Through hole; 21. Connecting block; 22. Sealed tank; 23. Central pipe; 24. First fixing ring; 25. Stirring block; 26. Electric cylinder; 27. Moving ring; 28. Second fixing ring; 29. ​​Discharge pipe; 30. Liquid outlet pipe; 31. Fourth valve body. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] To address the problems in existing technologies, such as uneven mixing and low mass transfer efficiency due to the easy settling of solid materials, insufficient gas dispersion affecting three-phase reactions, and material adhesion to the inner walls of the equipment during the reaction process causing blockages, the following technical solutions are proposed. Please refer to [link / reference needed]. Figures 1-5 ;

[0038] A 3,3-dimethylacrylic acid synthesis mixing reactor includes a support 1, a heat-insulating vessel 2 fixed to the upper end of the support 1, an injection pipe 3 fixed to the heat-insulating vessel 2, a liquid inlet mechanism disposed on the injection pipe 3 for injecting liquid into the injection pipe 3, a gas inlet mechanism disposed on the injection pipe 3 for injecting gas into the injection pipe 3, a first feeding mechanism disposed at the upper end of the heat-insulating vessel 2, a feeding cylinder 13 disposed at the end away from the injection pipe 3, a feeding mechanism disposed on the feeding cylinder 13, and a feeding mechanism disposed on the feeding cylinder 13. The second feeding mechanism, the stirring mechanism set on the feeding mechanism, the multiple connecting blocks 21 fixed to the top surface of the inner wall of the heat preservation vessel 2, the sealing tank 22 fixed to the lower end of the multiple connecting blocks 21, the scraping mechanism set on the sealing tank 22 for scraping the outer peripheral wall of the central cylinder 19, and the central cylinder 19 fixed to the outer wall of the outlet end of the feeding cylinder 13, the end of the central cylinder 19 facing the injection pipe 3 is open, the central cylinder 19 is located inside the sealing tank 22, and the outer peripheral wall of the central cylinder 19 is provided with multiple through holes 20;

[0039] A central tube 23 is fixedly connected to the inner wall of the output end of the injection tube 3. The output end of the central tube 23 passes through one end of the sealed container 22 and extends into the interior of the sealed container 22.

[0040] The output end of the central tube 23 faces the center of the stirring mechanism, and the lower end of the sealed tank 22 is equipped with a discharge mechanism.

[0041] In this embodiment, specifically: the liquid inlet mechanism includes a support plate 8 disposed outside the support 1, a water pump 9 fixed to the upper end of the support plate 8, and a water tank 10 disposed outside the support 1. The liquid pump 9 is connected to the liquid outlet of the water tank 10 through a pipe. The outer peripheral wall of the injection pipe 3 is fixedly connected to an inlet pipe 4. A first valve body 5 is provided on the inlet pipe 4. The liquid outlet of the water pump 9 is connected to the liquid inlet of the first valve body 5 through a pipe.

[0042] In this embodiment, specifically: the air intake mechanism includes an air pump 7 disposed outside the bracket 1 and an air intake pipe 6 fixed to the air outlet end of the air pump 7. The air outlet end of the air intake pipe 6 is fixed to the outer peripheral wall of the injection pipe 3 through the air intake pipe 3, and a solenoid valve 61 is provided on the air intake pipe 6.

[0043] In this embodiment, specifically: the first feeding mechanism includes a first feeding pipe 11 that is fixedly connected to the upper end of the heat preservation vessel 2 and a second valve body 12 disposed on the first feeding pipe 11. A second fixing ring 28 is fixedly connected to the lower part of the inner wall of the first feeding pipe 11. A discharge pipe 29 is fixedly connected to the lower end of the second fixing ring 28. The lower end of the discharge pipe 29 passes through the upper end of the sealed container 22 and extends to the inner wall of the sealed container 22.

[0044] In this embodiment, specifically: the feeding mechanism includes a motor 14 fixed to one end of the feeding cylinder 13 away from the center of the insulated kettle 2, a rotating rod 17 rotatably installed on the inner wall of one end of the feeding cylinder 13, and an auger 18 fixed to the outer peripheral wall of the rotating rod 17. The output shaft of the motor 14 passes through the feeding cylinder 13 and is fixed to one end of the rotating rod 17.

[0045] In this embodiment, specifically: the second feeding mechanism includes a second feeding pipe 15 fixed to the upper end of the feeding cylinder 13 and a third valve body 16 disposed on the second feeding pipe 15.

[0046] In this embodiment, specifically: the stirring mechanism includes a plurality of first fixing rings 24 fixed to the outer peripheral wall of the rotating rod 17 and a plurality of stirring blocks 25 fixed to the outer peripheral wall of each first fixing ring 24.

[0047] In this embodiment, specifically: the scraping mechanism includes an electric cylinder 26 and a moving ring 27. The electric cylinder 26 is fixedly connected to one end of the sealed tank 22 away from the motor 14. The output shaft of the electric cylinder 26 passes through the sealed tank 22 and is fixedly connected to the moving ring 27. The outer peripheral wall of the moving ring 27 is in contact with the inner wall of the sealed tank 22, and the inner wall of the moving ring 27 is in contact with the outer peripheral wall of the central cylinder 19.

[0048] In this embodiment, specifically: the discharge mechanism includes a liquid discharge pipe 30 that is fixedly connected to the lower end of the sealed tank 22 and a fourth valve body 31 disposed on the liquid discharge pipe 30. The lower end of the liquid discharge pipe 30 passes through the lower end of the heat preservation vessel 2 and extends to the bottom of the heat preservation vessel 2.

[0049] Working principle: First, prepare for the reaction by adding the required solid raw materials through the first feed pipe 11 or the second feed pipe 15 respectively, storing the liquid raw materials in the water tank 10, and connecting the gas source to the air pump 7.

[0050] When the reaction is started, the motor 14 is turned on to drive the rotating rod 17 and the auger 18 and stirring mechanism (including the first fixed ring 24 and the stirring block 25) to rotate. The solid raw material is forcibly conveyed axially in the feed cylinder 13 by the rotating auger 18 and enters the sealed tank 22 through the open end of the central cylinder 19.

[0051] At the same time, the water pump 9 is started and the first valve body 5 is opened, pumping the liquid from the water tank 10 to the liquid inlet pipe 4. The liquid flows through the injection pipe 3 and merges into the central pipe 23. Finally, it is sprayed from the output end of the central pipe 23 into the sealed tank 22, directly contacting the stirring block 25 and being dispersed.

[0052] When gas needs to be introduced, the air pump 7 is started and the solenoid valve 61 is controlled. The gas enters the injection pipe 3 through the air inlet pipe 6 and is sprayed into the reaction core area of ​​the sealed tank 22 along with the liquid through the central pipe 23. It is then sheared and broken into fine bubbles by the high-speed rotating stirring block 25. Under the strong shearing and stirring of the stirring block 25, the solid particles, liquid and gas are fully mixed and reacted in the sealed tank 22. The mixed material can circulate through the through hole 20 on the outer wall of the central cylinder 19.

[0053] During the reaction, the electric cylinder 26 can be controlled to move in a timely manner, driving the moving ring 27 to reciprocate along the axis of the central cylinder 19, thereby scraping off the material that may adhere to the outer wall of the central cylinder 19 and the inner wall of the sealed tank 22, keeping the heat transfer surface clean and the through hole 20 unobstructed.

[0054] After the reaction is complete, the fourth valve 31 on the outlet pipe 30 is opened, and with the assistance of the stirring mechanism, the reaction products are completely discharged through the outlet pipe 30 at the bottom of the sealed tank 22.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A mixed reaction vessel for the synthesis of 3,3-dimethacrylic acid, characterized in that: The system includes a support (1), a thermos (2) fixed to the upper end of the support (1), an injection pipe (3) fixed to the thermos (2), a liquid inlet mechanism for injecting liquid into the injection pipe (3) and a gas inlet mechanism for injecting gas into the injection pipe (3), a first feeding mechanism at the upper end of the thermos (2), a feeding cylinder (13) at the end away from the injection pipe (3), a feeding mechanism on the feeding cylinder (13), a second feeding mechanism on the feeding cylinder (13), and a... The stirring mechanism is placed on the feeding mechanism, multiple connecting blocks (21) are fixed to the top surface of the inner wall of the heat preservation vessel (2), a sealing tank (22) is fixed to the lower end of the multiple connecting blocks (21), a scraping mechanism is set on the sealing tank (22) for scraping the outer peripheral wall of the central cylinder (19), and a central cylinder (19) is fixed to the outer wall of the outlet end of the feed cylinder (13). The end of the central cylinder (19) facing the injection pipe (3) is open. The central cylinder (19) is located inside the sealing tank (22), and multiple through holes (20) are opened through the outer peripheral wall of the central cylinder (19). A central tube (23) is fixed to the inner wall of the output end of the injection tube (3). The output end of the central tube (23) passes through one end of the sealed container (22) and extends into the interior of the sealed container (22). The output end of the central tube (23) faces the center of the stirring mechanism, and the lower end of the sealed tank (22) is provided with a discharge mechanism.

2. The 3,3-dimethacrylic acid synthesis mixing reactor according to claim 1, characterized in that: The liquid inlet mechanism includes a support plate (8) disposed outside the support (1), a water pump (9) fixed to the upper end of the support plate (8), and a water tank (10) disposed outside the support (1). The pumping end of the water pump (9) is connected to the outlet end of the water tank (10) through a pipe. The outer peripheral wall of the injection pipe (3) is fixedly connected to the inlet pipe (4). The inlet pipe (4) is provided with a first valve body (5). The outlet end of the water pump (9) is connected to the inlet end of the first valve body (5) through a pipe.

3. The 3,3-dimethacrylic acid synthesis mixing reactor according to claim 1, characterized in that: The air intake mechanism includes an air pump (7) located outside the bracket (1) and an air intake pipe (6) fixed to the air outlet of the air pump (7). The air outlet of the air intake pipe (6) is fixed to the outer peripheral wall of the injection pipe (3). A solenoid valve (61) is provided on the air intake pipe (6).

4. The 3,3-dimethacrylic acid synthesis mixing reactor according to claim 1, characterized in that: The first feeding mechanism includes a first feeding pipe (11) that is fixed to the upper end of the insulated kettle (2) and a second valve body (12) disposed on the first feeding pipe (11). A second fixing ring (28) is fixed to the lower part of the inner wall of the first feeding pipe (11). A discharge pipe (29) is fixed to the lower end of the second fixing ring (28). The lower end of the discharge pipe (29) passes through the upper end of the sealed tank (22) and extends to the inner wall of the sealed tank (22).

5. The 3,3-dimethacrylic acid synthesis mixing reactor according to claim 1, characterized in that: The feeding mechanism includes a motor (14) fixed to one end of the feed cylinder (13) away from the center of the insulated kettle (2), a rotating rod (17) rotatably installed on the inner wall of one end of the feed cylinder (13), and an auger (18) fixed to the outer peripheral wall of the rotating rod (17). The output shaft of the motor (14) passes through the feed cylinder (13) and is fixed to one end of the rotating rod (17).

6. The 3,3-dimethacrylic acid synthesis mixing reactor according to claim 1, characterized in that: The second feeding mechanism includes a second feeding pipe (15) fixed to the upper end of the feeding cylinder (13) and a third valve body (16) disposed on the second feeding pipe (15).

7. The 3,3-dimethacrylic acid synthesis mixing reactor according to claim 5, characterized in that: The stirring mechanism includes a plurality of first fixing rings (24) fixed to the outer peripheral wall of the rotating rod (17) and a plurality of stirring blocks (25) fixed to the outer peripheral wall of each first fixing ring (24).

8. The 3,3-dimethacrylic acid synthesis mixing reactor according to claim 1, characterized in that: The scraping mechanism includes an electric cylinder (26) and a moving ring (27). The electric cylinder (26) is fixedly connected to one end of the sealed tank (22) away from the motor (14). The output shaft of the electric cylinder (26) passes through the sealed tank (22) and is fixedly connected to the moving ring (27). The outer peripheral wall of the moving ring (27) is in contact with the inner wall of the sealed tank (22), and the inner wall of the moving ring (27) is in contact with the outer peripheral wall of the central cylinder (19).

9. A mixed reaction vessel for the synthesis of 3,3-dimethacrylic acid according to claim 1, characterized in that: The discharge mechanism includes a liquid outlet pipe (30) that is fixed to the lower end of the sealed tank (22) and a fourth valve body (31) provided on the liquid outlet pipe (30). The lower end of the liquid outlet pipe (30) passes through the lower end of the heat preservation vessel (2) and extends to the bottom of the heat preservation vessel (2).

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