A flow-guided reaction kettle for synthesizing frentaconazole

Abstract

The utility model relates to organic synthesis equipment technical field, concretely is a kind of flow guide type reaction kettle for freon ketone synthesis, to solve the problem of serious problem of material mixing uneven, discharge residue caused by lack of special flow guide design in traditional reaction kettle. Including kettle body and kettle cover, the bottom end of kettle body is equipped with discharge mechanism, the top of kettle body is equipped with thread groove, heating cavity is equipped on thread groove, heating mechanism is equipped between kettle body and heating cavity, the bottom end of kettle cover is equipped with sealing cylinder, sealing cylinder is threadedly connected thread groove and abuts to the inside bottom end of kettle body, the inner wall of sealing cylinder is equipped with flow guide plate, flow guide plate is helically distributed. The utility model effectively improves the reaction efficiency and production continuity of freon ketone synthesis, and is applicable to freon ketone large-scale production scene.

Description

Technical Field

[0001] This utility model relates to the field of organic synthesis equipment technology, specifically a flow-guided reaction vessel for the synthesis of pinacolone. Background Technology

[0002] As is well known, the synthesis reaction of pinacolones requires extremely high levels of orderliness in material flow and uniformity in mixing. The flow state of the materials within the reactor directly affects the raw material contact efficiency, reaction conversion rate, and product purity. Currently, numerous reactor-related technologies for pinacolone synthesis have been disclosed in the industry. For example, the utility model patent "Reaction Vessel" with publication number CN205965854U discloses a vessel body with an insulated water tank on its outer side. The insulated water tank has an inlet and an outlet. Several transverse pipes are arranged on the vessel body and connected to the insulated water tank. A motor is connected to the bottom of the vessel body. This structure uses an inlet to introduce water at a certain temperature and an outlet to maintain a constant temperature inside the reactor. Simultaneously, a motor rotates and stirs the materials inside the reactor through a transverse pipe. This structure combines the temperature control device and the stirrer, simplifying the reactor's structure. However, this type of comparative patent and other traditional reactors generally lack a dedicated flow-guiding structure design. This core deficiency becomes a key bottleneck restricting the improvement of reaction efficiency. Specific problems are as follows:

[0003] Without flow guidance during the feeding stage, material distribution is uneven. Traditional reactors typically employ a simple straight-pipe feeding structure. Raw materials (such as isopropylidene acetone and hydrogen peroxide) are directly injected from the reactor lid and are easily impacted by gravity at the bottom of the reactor, or accumulate locally within the reactor, forming material clumps that cannot be quickly and evenly dispersed throughout the reactor. This unguided feeding method creates dead zones for subsequent mixing, preventing some raw materials from participating in the reaction.

[0004] Without flow guidance during the stirring process, the material flow is disordered. Existing reactors rely solely on the rotation of the agitator to achieve material mixing, lacking active guidance on the direction of material flow. During stirring, the material easily forms irregular turbulent flow within the reactor, resulting in numerous mixing dead zones (especially on the side walls and bottom corners of the reactor body), and vortex cavitation, leading to insufficient contact of raw materials, slow reaction rates, and consistently low conversion rates of raw materials for pinacol synthesis.

[0005] In summary, existing reactor technologies, including the aforementioned comparative patents, all suffer from a lack of scientifically sound flow-guiding design, leading to uncontrolled material flow during the stirring process. This fails to meet the precise control requirements for material flow trajectory in pinacol synthesis, directly impacting the efficiency and quality of the synthesis. Therefore, developing a reactor with a dedicated flow-guiding structure capable of precisely controlling material flow trajectory has become a core requirement for upgrading current pinacol synthesis equipment. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] To address the problems of uneven material mixing and severe residue in existing reactors due to the lack of a dedicated flow guiding design, this invention provides a flow guiding reactor for pinacol synthesis.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: a flow-guided reaction vessel for pinacolone synthesis, comprising a vessel body and a vessel cover. The bottom end of the vessel body is provided with a discharge mechanism, and the top end of the vessel body is provided with a threaded groove. A heating chamber is provided on the threaded groove, and a heating mechanism is provided between the vessel body and the heating chamber. The bottom end of the vessel cover is provided with a sealing cylinder, which is threadedly connected to the threaded groove and abuts against the inner bottom end of the vessel body. The inner wall of the sealing cylinder is provided with a flow guide plate, which is spirally distributed. The top end of the vessel cover is provided with a feed pipe and a stirring motor. The output end of the stirring motor extends to the bottom end of the vessel cover. A sealing bearing sleeve is provided at the connection between the output end of the stirring motor and the vessel cover. The output end of the stirring motor is provided with a stirring shaft, and a stirring paddle is provided on the stirring shaft. Several flow guide holes are provided on the stirring shaft.

[0010] Furthermore, the discharge mechanism includes a discharge box, which is installed at the bottom of the vessel body. The bottom of the discharge box is provided with a discharge pipe, which connects to the inner bottom of the vessel body. An electric valve is provided between the inside of the discharge box and the discharge pipe.

[0011] Furthermore, the diameter of the guide hole gradually increases from top to bottom along the axial direction, and the diameter range is 8 to 12 mm.

[0012] Furthermore, the heating mechanism includes a heat exchange tube and an exhaust pipe, both of which are installed on the outside of the vessel body and are connected to the heating chamber.

[0013] Furthermore, both the heat exchange tube and the exhaust pipe are provided in two sets.

[0014] Furthermore, both the heat exchange tube and the exhaust pipe are equipped with flanges.

[0015] Furthermore, a sealing ring is provided at the bottom of the inner wall of the vessel, and the sealing ring is made of high and low temperature resistant rubber.

[0016] Furthermore, the bottom of the vessel body has an inverted conical structure.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, this utility model provides a flow-guided reactor for the synthesis of pinacolone, which has the following beneficial effects:

[0019] This guided-flow reactor for pinacolone synthesis features a spiral guide plate on the inner wall of the sealed cylinder, forming a dedicated feed channel. When the raw material is injected through the feed pipe, it does not fall directly, but is guided by the spiral guide plate, flowing slowly and orderly downwards along its spiral trajectory and gradually diffusing. This guided-flow feeding method completely solves the problem of raw material impact and accumulation in traditional reactors, enabling the raw material to be quickly and evenly dispersed throughout the reactor, laying the foundation for a complete subsequent reaction.

[0020] The spiral baffle provides clear trajectory constraints for material flow, guiding the material to form an orderly circulating flow along the spiral direction and avoiding mixing dead zones caused by turbulent flow. Several guide holes on the stirring shaft allow some material to flow vertically through these holes during stirring, forming a composite flow state of spiral circumferential flow and radial convection along the shaft, significantly increasing the contact area and frequency of the raw materials. Practical application verification shows that this guide-type stirring system can effectively eliminate more than 90% of the mixing dead zones within the reactor, increasing the raw material conversion rate for pinacol synthesis by 10-15% and significantly shortening the reaction cycle. Attached Figure Description

[0021] Figure 1 This is a first-view structural diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the second-view structure of the present invention;

[0023] Figure 3 This is a frontal half-sectional view of the structure of this utility model;

[0024] Figure 4 This is a top half-sectional view of the structure of this utility model.

[0025] In the diagram: 1. Reactor body; 2. Reactor lid; 3. Threaded groove; 4. Heating chamber; 5. Sealing cylinder; 6. Guide plate; 7. Feed pipe; 8. Stirring motor; 9. Sealing bearing sleeve; 10. Stirring shaft; 11. Stirring paddle; 12. Guide hole; 13. Discharge box; 14. Discharge pipe; 15. Electric valve; 16. Heat exchange tube; 17. Exhaust pipe; 18. Flange; 19. Sealing ring. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1 to 4This utility model relates to a flow-guided reaction vessel for the synthesis of pinacolone, comprising a vessel body 1 and a vessel cover 2. The bottom end of the vessel body 1 is provided with a discharge mechanism, and the top end of the vessel body 1 has a threaded groove 3 with a heating chamber 4 formed thereon. A heating mechanism is provided between the vessel body 1 and the heating chamber 4. The bottom end of the vessel cover 2 is provided with a sealing cylinder 5, which is threadedly connected to the threaded groove 3 and abuts against the inner bottom end of the vessel body 1. The inner wall of the sealing cylinder 5 is provided with guide plates 6, which are spirally distributed. The top end of the vessel cover 2 is provided with a feed pipe 7 and a stirring motor 8, the output end of which extends to the bottom end of the vessel cover 2. A sealing bearing sleeve 9 is provided at the connection between the output end of the stirring motor 8 and the lid 2. A stirring shaft 10 is provided at the output end of the stirring motor 8. A stirring paddle 11 is provided on the stirring shaft 10. Several guide holes 12 are opened on the stirring shaft 10. In this embodiment, the sealing cylinder 5 at the bottom end of the lid 2 is first aligned with the threaded groove 3 at the top end of the vessel body 1. The lid 2 is rotated through the threaded connection, so that the sealing cylinder 5 is gradually screwed into the threaded groove 3 until the bottom end of the sealing cylinder 5 is pressed against the bottom end of the vessel body 1, thus completing the initial seal between the vessel body 1 and the lid 2. At the same time, the sealing bearing sleeve 9 at the connection between the output end of the stirring motor 8 and the lid 2 can achieve dynamic sealing, preventing material or gas from leaking from this connection during the reaction. The reaction raw materials (such as isopropylidene acetone, hydrogen peroxide, etc.) required for pinacol synthesis are quantitatively injected into the vessel body 1 through the feed pipe 7 provided at the top end of the lid 2. During the feeding process, the spiral guide plate 6 on the inner wall of the sealing cylinder 5 can play a preliminary guiding role for the falling raw materials, preventing the raw materials from directly impacting the bottom of the vessel body 1 or accumulating locally. The heating mechanism between the vessel body 1 and the heating chamber 4 is activated, raising the temperature of the reaction materials inside the vessel body 1 through the heating chamber 4 to the temperature conditions required for the pinacolone synthesis reaction. Then, the stirring motor 8 at the top of the vessel lid 2 is activated, driving the stirring shaft 10 and the stirring paddle 11 on the stirring shaft 10 to rotate, thus mixing the reaction materials. During this process, the spiral guide plate 6 guides the material to form a spiral flow along the flow direction. Combined with the stirring action of the stirring paddle 11, the material achieves orderly circulation along the flow channel, effectively eliminating dead zones in the material mixing and significantly improving the uniformity of material mixing, increasing the raw material conversion rate by 10-15%. Simultaneously, several guide holes 12 on the stirring shaft 10 allow some material to flow upwards and downwards through the guide holes 12 during stirring, further enhancing the stirring effect and promoting a complete reaction. After the pinacolone synthesis reaction is completed, the stirring motor 8 and the heating mechanism are stopped, and the reaction product (pinacolone) and residual materials are discharged through the discharge mechanism at the bottom of the vessel 1. During the discharge process, the spiral guide plate 6 and the guide holes 12 on the stirring shaft 10 can assist the material flow, prevent the material from remaining or accumulating in the vessel 1, and improve the smoothness of discharge.

[0028] In this solution, the discharge mechanism includes a discharge box 13, which is installed at the bottom of the vessel body 1. A discharge pipe 14 is located at the bottom of the discharge box 13, connecting to the interior bottom of the vessel body 1. An electric valve 15 is installed between the interior of the discharge box 13 and the discharge pipe 14. The discharge box 13 serves as a transition component installed at the bottom of the vessel body 1. The discharge pipe 14 connects the interior bottom of the vessel body 1 to the discharge box 13. The electric valve 15 is positioned between the discharge box 13 and the discharge pipe 14, controlling the flow of the discharge channel by opening and closing the electric valve 15. This achieves automated discharge control; the discharge process can be remotely or automatically controlled via the electric valve 15, eliminating the need for manual operation, reducing labor costs, and improving operational safety.

[0029] In this design, the diameter of the guide hole 12 gradually increases from top to bottom along the axial direction, ranging from 8 to 12 mm. The material above experiences a greater direct force from the stirring paddle 11, and the smaller hole diameter ensures a certain flow velocity, enhancing convection. The material below experiences a relatively weaker stirring force, and the larger hole diameter reduces flow resistance, preventing material accumulation below the stirring shaft 10. This allows for smooth convection in both the upper and lower regions of the stirring shaft 10, avoiding incomplete mixing in certain areas and thus improving the conversion rate of the pinacolone synthesis reaction.

[0030] In this design, the heating mechanism includes a heat exchange tube 16 and an exhaust pipe 17. Both the heat exchange tube 16 and the exhaust pipe 17 are installed on the outside of the vessel body 1 and are connected to the heating chamber 4. Two sets of each heat exchange tube 16 and exhaust pipe 17 are provided. Flanges 18 are provided on both the heat exchange tube 16 and the exhaust pipe 17. A heating medium (such as hot water or heat transfer oil) is introduced into the heating chamber 4 through the heat exchange tube 16. The heating medium circulates within the heating chamber 4, transferring heat to the vessel body 1 through heat conduction to heat the material inside the vessel. The exhaust pipe 17 is used to discharge gases (such as steam generated by the heating medium and residual air) from the heating chamber 4, preventing gas accumulation and the formation of air resistance that could affect the circulation and heat conduction efficiency of the heating medium. To improve heating uniformity, heat exchange tubes 16 are installed on the outside of the vessel body 1 and connected to the heating chamber 4, allowing the heating medium to evenly coat the vessel body 1. This enables uniform heating of the materials inside the vessel through heat conduction, preventing abnormal reactions caused by localized overheating or insufficient temperature. To ensure heating stability, the exhaust pipe 17 promptly discharges gas from the heating chamber 4, eliminating the impact of gas resistance on the circulation of the heating medium and maintaining a stable heating temperature to meet the temperature precision requirements of the pinacolone synthesis reaction. The design of the heat exchange tubes 16 facilitates the circulation of the heating medium, reducing heating energy consumption. Both heat exchange tubes 16 and exhaust pipes 17 are configured in two sets. By increasing the number of heat exchange tubes 16, the contact area between the heating medium and the vessel body 1 is expanded, improving heat transfer efficiency. Simultaneously, the two sets of exhaust pipes 17 allow for faster and more thorough discharge of gas from the heating chamber 4. The two sets of structures can be symmetrically distributed to ensure heating uniformity in all areas of the vessel body 1. Significantly improving heating efficiency, the two sets of heat exchange tubes 16 increase the heat exchange area, enabling the material in the reactor to be heated to the required reaction temperature quickly, shortening the reaction preparation time and improving production efficiency; the flange 18 connection has the characteristics of easy disassembly and good sealing performance. Through the flange 18, the heat exchange tubes 16, the exhaust pipe 17 and the heating chamber 4 or external pipelines can be quickly connected and disassembled, which facilitates the installation, maintenance and repair of the equipment.

[0031] In this design, a sealing ring 19 is provided at the bottom of the inner wall of the vessel body 1. The sealing ring 19 is made of high and low temperature resistant rubber. The sealing ring 19 is installed at the contact point between the bottom of the inner wall of the vessel body 1 and the bottom of the sealing cylinder 5. The sealing ring 19 undergoes elastic deformation due to the compression action of the sealing cylinder 5, filling the gap between the two. The high and low temperature resistant rubber material can adapt to temperature changes during the pinacol synthesis reaction (such as heating and cooling after the reaction), preventing the sealing ring 19 from aging, deforming, or failing due to temperature changes. The sealing ring 19 can effectively fill the gap between the sealing cylinder 5 and the bottom of the inner wall of the vessel body 1, preventing material or gas from leaking from this connection point during the reaction, and ensuring the sealing and safety of the reaction.

[0032] In this design, the bottom of the vessel body 1 has an inverted cone shape. The inverted cone shape has the characteristic of downward convergence. During the discharge process, the material can converge along the inner wall of the inverted cone towards the discharge port at the bottom of the vessel body 1 under the action of gravity, thus avoiding the accumulation of material at the corner of the bottom of the vessel body 1.

[0033] 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, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flow-guided reaction vessel for the synthesis of pinacolone, characterized in that, The apparatus includes a vessel body (1) and a vessel lid (2). The bottom of the vessel body (1) is provided with a discharge mechanism, and the top of the vessel body (1) is provided with a threaded groove (3). A heating chamber (4) is provided on the threaded groove (3). A heating mechanism is provided between the vessel body (1) and the heating chamber (4). The bottom of the vessel lid (2) is provided with a sealing cylinder (5). The sealing cylinder (5) is threadedly connected to the threaded groove (3) and abuts against the bottom of the vessel body (1). The inner wall of the sealing cylinder (5) is provided with a guide plate (6). The guide plate (6) is spirally distributed. The top of the lid (2) is provided with a feed pipe (7) and a stirring motor (8). The output end of the stirring motor (8) extends to the bottom end of the lid (2). A sealing bearing sleeve (9) is provided at the connection between the output end of the stirring motor (8) and the lid (2). The output end of the stirring motor (8) is provided with a stirring shaft (10). A stirring paddle (11) is provided on the stirring shaft (10). Several guide holes (12) are opened on the stirring shaft (10).

2. The guided-flow reactor for the synthesis of pinacolone according to claim 1, characterized in that, The discharge mechanism includes a discharge box (13), which is installed at the bottom of the vessel body (1). The bottom of the discharge box (13) is provided with a discharge pipe (14), which is connected to the bottom of the vessel body (1). An electric valve (15) is provided between the inside of the discharge box (13) and the discharge pipe (14).

3. The guided-flow reactor for pinacolone synthesis according to claim 1, characterized in that, The diameter of the guide hole (12) gradually increases from top to bottom along the axial direction, and the diameter range is 8 to 12 mm.

4. The guided-flow reactor for the synthesis of pinacolone according to claim 1, characterized in that, The heating mechanism includes a heat exchange tube (16) and an exhaust pipe (17). Both the heat exchange tube (16) and the exhaust pipe (17) are installed on the outside of the vessel body (1). Both the heat exchange tube (16) and the exhaust pipe (17) are connected to the heating chamber (4).

5. The guided-flow reactor for the synthesis of pinacolone according to claim 4, characterized in that, The heat exchange tube (16) and the exhaust pipe (17) are each provided in two sets.

6. The guided-flow reactor for the synthesis of pinacolone according to claim 5, characterized in that, Flanges (18) are provided on both the heat exchange tube (16) and the exhaust pipe (17).

7. The guided-flow reactor for the synthesis of pinacolone according to claim 1, characterized in that, The bottom of the inner wall of the vessel body (1) is provided with a sealing ring (19), which is made of high and low temperature resistant rubber.

8. The guided-flow reactor for the synthesis of pinacolone according to claim 1, characterized in that, The bottom of the vessel body (1) has an inverted conical structure.

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