A suspension polymerization reactor for polyvinyl chloride

Abstract

This utility model discloses a polyvinyl chloride suspension polymerization reactor, relating to the field of polymerization reactor technology. It includes an outer reactor body with a connecting frame on its annular side. A right-angle gear is rotatably connected inside the connecting frame, and a connecting block is fixedly connected to the lower surface of the connecting frame. An inner reactor body is rotatably connected inside the outer reactor body. During the stirring process, the output shaft of a servo motor drives the fixed right-angle gear to rotate. The rotation of the right-angle gear causes the inner reactor body, which is engaged with it, to rotate as well. The inner reactor body is rotatably mounted inside the outer reactor body via two fixed connecting rings. At this time, the rotation direction of the inner reactor body is opposite to that of the stirring rod. This interaction allows the materials to be subjected to forces in different directions, resulting in more thorough mixing and effectively improving the polymerization reaction effect.

Description

Technical Field

[0001] This utility model relates to the field of polymerization reactor technology, and in particular to a polyvinyl chloride suspension polymerization reactor. Background Technology

[0002] The suspension polymerization reactor for polyvinyl chloride (PVC) is a core piece of equipment in PVC production and has wide applications in the chemical industry. This reactor involves adding raw materials such as vinyl chloride monomer, initiator, dispersant, and water into the reactor. Under stirring, the monomer is uniformly dispersed in the water, and the polymerization reaction proceeds according to the free radical polymerization mechanism to produce PVC resin. Its main structure typically includes the following parts:

[0003] 1. Reactor body: Made of high-strength carbon steel or stainless steel, capable of withstanding the high temperature and high pressure during the polymerization reaction, providing a sealed space for the reaction;

[0004] 2. Stirring device: It consists of a stirring shaft and a stirring paddle. It is driven to rotate by a stirring drive mechanism to promote the mixing of materials and make the vinyl chloride monomer evenly dispersed in water.

[0005] 3. Temperature control system: It consists of a jacket and internal cooling baffles, etc. It removes the heat of reaction by circulating cooling water and maintains a stable reaction temperature.

[0006] 4. Inlet and outlet: used for feeding raw materials and discharging polyvinyl chloride slurry after polymerization reaction, respectively;

[0007] 5. Top condenser: Used to condense vinyl chloride vapor generated during the reflux polymerization process, improve monomer utilization, and assist in controlling reaction temperature and pressure.

[0008] Currently, various technologies are being used in the industry to improve the suspension polymerization of polyvinyl chloride (PVC). Some manufacturers optimize the structure and speed of the stirring paddle to enhance material mixing; others improve the temperature control system to increase temperature control accuracy and ensure stable reaction; still others increase the volume of the polymerization reactor to achieve large-scale production and reduce costs.

[0009] However, the above-described implementation still has the following problems: During the polymerization reaction, the stirring device of the traditional polymerization reactor relies solely on the stirring rod to drive the stirring paddle to rotate. The turbulence of the material inside the reactor is limited, resulting in uneven monomer dispersion and low mass and heat transfer efficiency, which affects the polymerization rate and product quality. Furthermore, the drive mechanism on the reactor body is usually fixedly connected to the reactor body. When the drive mechanism malfunctions or requires technical upgrades, the disassembly process is complex, and maintenance and replacement are difficult, not only consuming a lot of time and manpower but also causing prolonged equipment downtime, affecting production efficiency. This application proposes a solution to this problem: an inner reactor body that rotates in the opposite direction to the stirring rod is installed inside the polymerization reactor, and a detachable drive mechanism is used to improve the polymerization reaction effect while facilitating equipment maintenance and upgrades. Utility Model Content

[0010] To address the shortcomings of existing technologies, this utility model provides a polyvinyl chloride suspension polymerization reactor, which solves the problem that the stirring device of traditional polymerization reactors relies solely on the stirring rod to drive the stirring paddle to rotate. This results in limited turbulence of the material inside the reactor, leading to uneven monomer dispersion and low mass and heat transfer efficiency, which affects the polymerization rate and product quality. In addition, the drive mechanism on the reactor body is usually fixedly connected to the reactor body. When the drive mechanism malfunctions or needs to be upgraded, the disassembly process is complicated, and maintenance and replacement are difficult.

[0011] To achieve the above objectives, this utility model provides the following technical solution:

[0012] A polyvinyl chloride suspension polymerization reactor includes an outer reactor body. A connecting frame is provided on the annular side of the outer reactor body. A right-angle gear is rotatably connected inside the connecting frame. A connecting block is fixedly connected to the lower surface of the connecting frame. An inner reactor body is rotatably connected inside the outer reactor body. Two hexagon socket head cap screws are threaded onto the connecting block. Two fixing blocks are fixedly connected to the left surface of the connecting frame. Both hexagon socket head cap screws are threaded onto the outer reactor body. Two connecting rings are fixedly connected to the annular side of the inner reactor body. Both connecting rings are rotatably connected to the outer reactor body.

[0013] Preferably, the inner vessel body has a set of gear grooves on its annular side, and each set of gear grooves is movably engaged with a right-angle gear. The outer vessel body has two slots on its annular side, and each slot is movably engaged with a fixed block.

[0014] Preferably, the outer vessel body has a second slot on its annular side, the second slot being movably engaged with the connecting block, and a servo motor is fixedly installed on the upper surface of the connecting frame, the output shaft of the servo motor being fixedly connected to a right-angle gear.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. During the stirring process of polyvinyl chloride, the output shaft of the servo motor will drive the fixed right-angle gear to rotate. The rotation of the right-angle gear will drive the inner vessel body that is locked to it to rotate together. The inner vessel body is rotated and set inside the outer vessel body through two fixed connecting rings. At this time, the rotation direction of the inner vessel body is opposite to the rotation direction of the stirring rod. The two can generate a more complex flow pattern during the stirring process. This interaction makes the material subjected to force in different directions, so as to mix more thoroughly and effectively improve the polymerization reaction effect.

[0017] 2. By turning the two Allen screws, the connecting frame can be loosened from the outer vessel body. At this time, the connecting frame can be disassembled by driving the servo motor and right-angle gear on it. The connecting frame is engaged with the outer vessel body through the connecting block and two fixing blocks on it. The overall detachable design of the right-angle gear facilitates later maintenance and reduces cleaning difficulty. There is no need to disassemble the outer vessel body or other complex structures as a whole, which shortens the troubleshooting time and improves maintenance efficiency. Attached Figure Description

[0018] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0019] Figure 1 This is an overall structural diagram of the present invention;

[0020] Figure 2 This is an exploded view of the overall structure of this utility model;

[0021] Figure 3 This is a structural diagram of the inner vessel of this utility model;

[0022] Figure 4 This is a structural diagram of the connecting frame of this utility model.

[0023] Legend: 1. Outer vessel body; 2. Connecting frame; 3. Right angle gear; 4. Servo motor; 5. Slot 1; 6. Slot 2; 7. Inner vessel body; 8. Gear groove; 9. Connecting ring; 10. Fixing block; 11. Connecting block; 12. Hex socket screw. Detailed Implementation

[0024] This application provides a polyvinyl chloride suspension polymerization reactor, which effectively solves the problems of traditional polymerization reactors where the stirring device relies solely on the stirring rod to drive the stirring paddle, resulting in limited turbulence of the material inside the reactor, uneven monomer dispersion, and low mass and heat transfer efficiency, which affect the polymerization rate and product quality. Furthermore, the drive mechanism on the reactor body is usually fixedly connected to the reactor body, making disassembly complex and maintenance and replacement difficult when the drive mechanism malfunctions or requires technical upgrades. By providing an inner reactor body that rotates in the opposite direction to the stirring rod and employing a detachable drive mechanism, the polymerization reaction effect is improved, while also facilitating equipment maintenance and upgrades. Example

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the technical solution in this application embodiment effectively solves the problem that the stirring device of a traditional polymerization reactor relies solely on the stirring rod to drive the stirring paddle to rotate, resulting in limited turbulence of the material inside the reactor. This leads to uneven monomer dispersion, low mass and heat transfer efficiency, and affects the polymerization rate and product quality. Furthermore, the drive mechanism on the reactor body is usually fixedly connected to the reactor body, making disassembly complex and repair and replacement difficult when the drive mechanism malfunctions or requires technical upgrades. The overall approach is as follows:

[0026] To address the problems existing in the prior art, this utility model provides a polyvinyl chloride suspension polymerization reactor, including an outer reactor body 1. A connecting frame 2 is provided on the annular side of the outer reactor body 1, and a right-angle gear 3 is rotatably connected inside the connecting frame 2. A connecting block 11 is fixedly connected to the lower surface of the connecting frame 2. An inner reactor body 7 is rotatably connected inside the outer reactor body 1. Two internal hexagon screws 12 are threaded onto the connecting block 11. Two fixing blocks 10 are fixedly connected to the left surface of the connecting frame 2. Both internal hexagon screws 12 are threaded onto the outer reactor body 1. Two connecting rings 9 are fixedly connected to the annular side of the inner reactor body 7, and both connecting rings 9 are rotatably connected to the outer reactor body 1. In the process of producing polyvinyl chloride by suspension polymerization, vinyl chloride monomer (VCM) polymerizes according to the free radical polymerization mechanism under the initiator of peroxides, azo compounds, or under the action of light and heat. The stirring rod inside the outer reactor body 1 ensures that the vinyl chloride monomer is uniformly dispersed in the water. The process involves forming suspended droplets, with the dispersant stabilizing the droplets and preventing them from sticking together. Under the action of the initiator, vinyl chloride monomer undergoes a polymerization reaction within the droplets, gradually forming polyvinyl chloride particles. When the reaction reaches the predetermined conversion rate or reaction endpoint, a terminator is added to kill active free radicals and terminate the polymerization reaction. During the stirring process, the output shaft of the servo motor 4 drives the fixed right-angle gear 3 to rotate. The rotation of the right-angle gear 3 will drive the inner vessel 7, which is engaged with it, to rotate together. The inner vessel 7 is rotatably set inside the outer vessel 1 through two fixed connecting rings 9. At this time, the rotation direction of the inner vessel 7 is opposite to that of the stirring rod. The two can generate a more complex flow pattern during the stirring process. This interaction causes the material to be subjected to forces in different directions, thereby enabling more thorough mixing and effectively improving the polymerization reaction effect.

[0027] The inner vessel body 7 has a set of gear grooves 8 on its annular side, which are all engaged with right-angle gears 3. The outer vessel body 1 has two slots 5 on its annular side, which are engaged with two fixing blocks 10 respectively. The outer vessel body 1 also has a slot 6 on its annular side, which is engaged with a connecting block 11. A servo motor 4 is fixedly installed on the upper surface of the connecting frame 2. The output shaft of the servo motor 4 is fixedly connected to the right-angle gear 3. By rotating the two hexagonal screws 12, the fixing between the connecting frame 2 and the outer vessel body 1 can be opened. At this time, the connecting frame 2 can drive the servo motor 4 and the right-angle gear 3 to be disassembled. The connecting frame 2 is engaged with the outer vessel body 1 through the connecting block 11 and the two fixing blocks 10. The overall detachable design of the right-angle gear 3 facilitates later maintenance and reduces cleaning difficulty. The entire outer vessel body 1 or other complex structures do not need to be disassembled, which shortens the troubleshooting time and improves maintenance efficiency.

[0028] Among them, the outer vessel 1: as the pressure-bearing body of the polymerization reaction, it provides a closed space for the reaction, withstands high temperature and high pressure, and ensures the safe progress of the polymerization reaction;

[0029] Connector 2: Supports and fixes the servo motor 4 and right-angle gear 3, providing a support structure for their installation and operation;

[0030] Right-angle gear 3: transmits power to servo motor 4, driving inner vessel 7 to rotate, so that inner vessel 7 rotates in the opposite direction to stirring rod, enhancing material mixing effect;

[0031] Servo motor 4: provides power to drive the right-angle gear 3 to rotate, thereby driving the inner vessel 7 to rotate, achieving the opposite rotation to the stirring rod;

[0032] Slot 5: It cooperates with the fixing block 10 to realize the snap-fit ​​fixing of the connecting frame 2 and the outer vessel body 1, which facilitates the installation and disassembly of the connecting frame 2;

[0033] Slot 2 6: Cooperates with connecting block 11 to further fix connecting bracket 2 and ensure the stability of connecting bracket 2 installation;

[0034] Inner vessel 7: Rotates in the opposite direction to the stirring rod, creating a complex flow pattern to fully mix the materials and improve the polymerization reaction effect;

[0035] Gear groove 8: meshes with right angle gear 3, enabling the inner vessel 7 to rotate under the drive of right angle gear 3, achieving opposite rotation to the stirring rod;

[0036] Connecting ring 9: Supports the inner vessel 7, enabling it to rotate within the outer vessel 1 and ensuring the stability of the inner vessel 7's rotation;

[0037] Fixing block 10: It cooperates with slot 5 to fix the connecting frame 2, which facilitates the disassembly and maintenance of the connecting frame 2;

[0038] Connecting block 11: It cooperates with slot 2 6 to fix the connecting bracket 2, and at the same time provides the installation position for the internal hex screw 12;

[0039] Hex socket screw 12: Fixes the connecting bracket 2 to the outer vessel body 1, making it easy to disassemble the connecting bracket 2 and facilitate equipment maintenance and upgrades.

[0040] Working principle:

[0041] In the suspension polymerization process of polyvinyl chloride (PVC), vinyl chloride monomer (VCM) polymerizes under the initiator of peroxides, azo compounds, or under the influence of light and heat, following a free radical polymerization mechanism. The stirring rod inside the outer vessel 1 uniformly disperses the VCM in water, forming suspended droplets. The dispersant stabilizes the droplets, preventing them from sticking together. Under the action of the initiator, the VCM polymerizes within the droplets, gradually forming PVC particles. When the reaction reaches the predetermined conversion rate or endpoint, a terminator is added to kill the active free radicals and terminate the polymerization reaction. During the stirring process, the output shaft of the servo motor 4 drives the fixed right-angle gear 3 to rotate. The rotation of the right-angle gear 3 causes the inner vessel 7, which is engaged with it, to rotate as well. The inner vessel 7, through its fixed... Two fixed connecting rings 9 are rotatably set inside the outer vessel body 1. At this time, the inner vessel body 7 rotates in the opposite direction to the stirring rod. The two can generate a more complex flow pattern during the stirring process. This interaction causes the material to be subjected to force in different directions, so as to mix more fully and effectively improve the polymerization reaction effect. By rotating the two internal hexagon screws 12, the fixing of the connecting frame 2 to the outer vessel body 1 is opened. At this time, the connecting frame 2 can drive the servo motor 4 and right angle gear 3 set on it to be disassembled. The connecting frame 2 is engaged with the outer vessel body 1 through the fixed connecting block 11 and two fixing blocks 10. The overall detachable design of the right angle gear 3 facilitates the later maintenance and cleaning, reduces the cleaning difficulty, and eliminates the need to completely disassemble the outer vessel body 1 or other complex structures, shortening the troubleshooting time and improving maintenance efficiency.

[0042] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A polyvinyl chloride suspension polymerization reactor, comprising an outer reactor body (1), characterized in that, The outer vessel body (1) is provided with a connecting frame (2) on its annular side. A right-angle gear (3) is rotatably connected inside the connecting frame (2). A connecting block (11) is fixedly connected to the lower surface of the connecting frame (2). An inner vessel body (7) is rotatably connected inside the outer vessel body (1). Among them, the connecting block (11) has two internal hexagon screws (12) threaded in, and the left surface of the connecting frame (2) has two fixing blocks (10) fixedly connected, and the two internal hexagon screws (12) are threaded in with the outer vessel body (1).

2. The polyvinyl chloride suspension polymerization reactor as described in claim 1, characterized in that: Two connecting rings (9) are fixedly connected to the annular side of the inner vessel body (7); Both of the connecting rings (9) are rotatably connected to the outer vessel body (1).

3. The polyvinyl chloride suspension polymerization reactor as described in claim 1, characterized in that: The inner vessel body (7) has a set of gear grooves (8) on its annular side. In this group, all of the gear slots (8) are movably engaged with the right angle gear (3).

4. The polyvinyl chloride suspension polymerization reactor as described in claim 1, characterized in that: The outer vessel body (1) has two slots (5) on its annular side. Among them, the two slots (5) are respectively engaged with the two fixing blocks (10).

5. The polyvinyl chloride suspension polymerization reactor as described in claim 1, characterized in that: The outer vessel body (1) has a slot 2 (6) on its annular side. The second slot (6) is movably engaged with the connecting block (11).

6. The polyvinyl chloride suspension polymerization reactor as described in claim 1, characterized in that: A servo motor (4) is fixedly installed on the upper surface of the connecting frame (2); The output shaft of the servo motor (4) is fixedly connected to the right-angle gear (3).

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