Final polycondensation reaction kettle

Abstract

The utility model relates to a final polycondensation reaction kettle which comprises a horizontal tank body, a stirring assembly, a feeding pipeline and a discharging pipeline, the stirring assembly comprises a first stirrer and a second stirrer, and the first stirrer and the second stirrer are both arranged in the horizontal tank body and located between the feeding pipeline and the discharging pipeline. The stirring assembly has the advantages that the stirring assembly is arranged to be of the structure of the first stirrer and the second stirrer, and due to the fact that the rotation directions of the first stirrer and the second stirrer are opposite, materials flow in the horizontal tank body in an S-shaped route; the reaction time of the materials is prolonged to the greatest extent, so that the condensation polymerization reaction is completely carried out, the reaction efficiency is further improved, and the viscosity of the condensation polymerization product is improved.

Description

Technical Field

[0001] This utility model relates to a final polycondensation reactor. Background Technology

[0002] In traditional horizontal polycondensation reactors, the horizontal agitator uses impellers to push the material from the front to the back of the reactor during the polycondensation reaction, gradually completing the reaction. However, the traditional horizontal agitator uses an up-and-down rotating stirring mode, resulting in a straight material flow path. Under high load conditions and demanding reactor reaction requirements, this can easily lead to insufficient stirring, material accumulation at the front, and short reaction time, ultimately resulting in incomplete polycondensation, low melt viscosity, and consequently affecting the quality of the polyester product. Utility Model Content

[0003] The purpose of this invention is to solve the problem that the existing horizontal polycondensation reactor, which uses vertical rotating agitators, tends to have a short reaction time for materials. This invention proposes a final polycondensation reactor, which uses a first agitator and a second agitator with opposite rotation directions to make the material flow in an S-shaped path within the horizontal tank, thereby maximizing the reaction time of the material, ensuring that the polycondensation reaction occurs completely, further improving reaction efficiency, and increasing the viscosity of the polycondensation product.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: a final polycondensation reactor, including a horizontal tank, a stirring assembly, a feed pipe and a discharge pipe, wherein the feed pipe is located at one end of the horizontal tank and the discharge pipe is located at the other end of the horizontal tank. A gas phase pipe is provided on the horizontal tank. The stirring assembly includes a first stirrer and a second stirrer, both of which are located in the horizontal tank and between the feed pipe and the discharge pipe. The rotation directions of the first stirrer and the second stirrer are opposite to each other.

[0005] Preferably, both the first and second agitators include a motor and a stirring shaft. The motor is mounted on the outer wall of the horizontal tank and includes a motor shaft connected to the stirring shaft. The stirring shaft has at least three layers of blades, each with a different length.

[0006] Preferably, the stirring shaft is provided with three layers of blades, the length of the three layers of blades increasing sequentially from bottom to top, and the length ratio of the three layers of blades is 5:6:7.

[0007] Preferably, the center distance between two adjacent blade layers from bottom to top and the distance from the topmost blade to the motor shaft are not equal.

[0008] Preferably, the center distances between two adjacent blade layers from bottom to top are L1 and L2, respectively, and the distance from the topmost blade to the motor shaft is L3, where: L1:L2:L3=5:6:10.

[0009] Preferably, the impeller includes a connecting sleeve disposed on the stirring shaft, and at least three blades disposed on the connecting sleeve, wherein the connecting sleeve is provided with locking screws for locking the connecting sleeve to the stirring shaft.

[0010] Preferably, the motor shaft and the stirring shaft are connected by a coupling.

[0011] Preferably, the vertical axes of the first agitator and the second agitator are symmetrically arranged about the vertical center line of the horizontal tank.

[0012] Preferably, the stirring assembly further includes a controller, and both the first stirrer and the second stirrer are connected to the controller.

[0013] In summary, the advantages of this utility model are as follows: By configuring the stirring assembly into a structure of a first stirrer and a second stirrer, and because the rotation directions of the first and second stirrers are opposite, the material flows in an S-shaped path within the horizontal tank, maximizing the reaction time and ensuring the complete occurrence of the polycondensation reaction, thereby further improving reaction efficiency and increasing the viscosity of the polycondensation product. Secondly, the dual stirring of the first and second stirrers can significantly improve the uniformity of material stirring, ensuring that the reactants and catalyst are thoroughly and evenly mixed, thus improving reaction efficiency and reducing the occurrence of side reactions. Furthermore, placing the first and second stirrers on the horizontal tank between the feed pipe and the discharge pipe facilitates material feeding and discharging. Finally, the reaction status and progress of the polycondensation reaction can be precisely controlled by adjusting the speed of the first and second stirrers, meeting different process requirements during production. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the structure of a final polycondensation reactor according to the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the first stirrer in this utility model;

[0017] Figure 3 This is a schematic diagram of the blade structure in this utility model.

[0018] Figure label:

[0019] 1 Horizontal tank body, 2 Agitator assembly, 21 First agitator, 22 Second agitator, 23 Motor, 231 Motor shaft, 24 Agitator shaft, 25 Blade, 251 Connecting sleeve, 252 Blade, 253 Locking screw, 26 Coupling, 27 Controller, 3 Feed pipe, 4 Discharge pipe, 5 Gas phase pipe. Detailed Implementation

[0020] like Figure 1 , Figure 2 and Figure 3 As shown, a final polycondensation reactor includes a horizontal tank 1, a stirring assembly 2, a feed pipe 3, and a discharge pipe 4. The feed pipe 3 is located at one end of the horizontal tank 1, and the discharge pipe 4 is located at the other end of the horizontal tank 1. A gas phase pipe 5 is provided on the horizontal tank 1. The stirring assembly 2 includes a first stirrer 21 and a second stirrer 22. Both the first stirrer 21 and the second stirrer 22 are located inside the horizontal tank 1 and between the feed pipe 3 and the discharge pipe 4. The rotation directions of the first stirrer 21 and the second stirrer 22 are opposite. In this embodiment, the first stirrer rotates clockwise, and the second stirrer rotates counterclockwise. In actual use, the reactants enter the horizontal tank 1 through the feed pipe, then flow through the first stirrer and the second stirrer in sequence, and finally flow out from the discharge pipe. The gas generated during the reaction is discharged through the gas phase pipe.

[0021] The mixing assembly is configured with a first agitator and a second agitator. Since the rotation directions of the first and second agitators are opposite, the material flows in an S-shaped path within the horizontal tank, maximizing the reaction time and ensuring the complete occurrence of the polycondensation reaction. This further improves reaction efficiency and increases the viscosity of the polycondensation product. Secondly, the dual stirring of the first and second agitators significantly enhances the uniformity of material mixing, ensuring thorough and uniform mixing of the reactants and catalyst, thereby improving reaction efficiency and reducing side reactions. Furthermore, placing the first and second agitators on the horizontal tank between the inlet and outlet pipes facilitates material feeding and discharging. Finally, the reaction status and progress of the polycondensation reaction can be precisely controlled by adjusting the speed of the first and second agitators, meeting different process requirements during production.

[0022] Both the first agitator 21 and the second agitator 22 include a motor 23 and a stirring shaft 24. The motor 23 is mounted on the outer wall of the horizontal tank 1 and includes a motor shaft 231 connected to the stirring shaft 24. The stirring shaft 24 has at least three layers of blades 25, each with unequal lengths. By configuring the first agitator 21 and the second agitator 22 as a structure of a motor and a stirring shaft, the rotation of the motor drives the rotation of the stirring shaft. Since the stirring shaft has at least three layers of blades, efficient material mixing can be achieved. Mounting the motor on the outer wall of the horizontal tank 1 facilitates motor maintenance and repair. Furthermore, the unequal lengths of the three layers of blades 25 maximize the mixing of the reactants, providing a driving force to the materials during mixing and acting as a guide, allowing the materials to flow along the designed path. Specifically, the stirring shaft 24 is provided with three layers of blades 25, the length of which increases sequentially from bottom to top. The length ratio of the three layers of blades 25 is 5:6:7. This provides good stirring effect, reduces blade damage, and improves the overall service life. Furthermore, the center distance between adjacent layers of blades 25 from bottom to top, and the distance from the topmost blade 25 to the motor shaft 231, are not equal. By setting different spacings, the flow resistance of the material can be reduced, while further increasing the viscosity of the material and enhancing the condensation reaction. Specifically, the center distances between adjacent layers of blades 25 from bottom to top are L1 and L2, and the distance from the topmost blade 25 to the motor shaft 231 is L3, where L1:L2:L3 = 5:6:10. The impeller 25 includes a connecting sleeve 251 disposed on the stirring shaft 24, and at least three blades 252 disposed on the connecting sleeve 251. The connecting sleeve 251 is provided with locking screws 253 for locking the connecting sleeve 251 to the stirring shaft 24. The impeller is configured as a structure of connecting sleeve and blades. In this embodiment, five blades are preferred. The five blades are evenly distributed on the outer wall of the connecting sleeve, resulting in good stirring effect. The connecting sleeve facilitates the installation of the entire impeller and the stirring shaft, and the installation position of the impeller on the stirring shaft can be set according to different stirring requirements. Since the connecting sleeve is provided with locking screws, the fixing quality of the impeller can be guaranteed during stirring. When the impeller needs to be repaired or replaced, the impeller can be quickly removed by simply loosening the locking screws. The overall installation and disassembly are convenient.

[0023] The motor shaft 231 and the stirring shaft 24 are connected by a coupling 26. This coupling ensures stable and efficient operation of the stirring shaft, reduces vibration and wear during operation, and improves the overall service life. The vertical axes of the first stirrer 21 and the second stirrer 22 are symmetrically arranged about the vertical center line of the horizontal tank 1. This achieves a more uniform mixing effect and balances the torque within the entire horizontal tank, reducing vibration and wear during operation. The stirring assembly 2 also includes a controller 27, which is connected to both the first stirrer 21 and the second stirrer 22. The controller allows for precise control of the speed of the first and second stirrers and is easy to adjust. The controller is existing technology, and its specific structure is not described in detail in this embodiment.

[0024] In addition to the preferred embodiments described above, there are other embodiments of this utility model. Those skilled in the art can make various changes and modifications based on this utility model. As long as they do not depart from the spirit of this utility model, they should all fall within the scope defined by the appended claims.

Claims

1. A final polycondensation reactor, comprising a horizontal tank (1), a stirring assembly (2), a feed pipe (3), and a discharge pipe (4), wherein the feed pipe (3) is disposed at one end of the horizontal tank (1), the discharge pipe (4) is disposed at the other end of the horizontal tank (1), and a gas phase pipe (5) is provided on the horizontal tank (1), characterized in that: The stirring assembly (2) includes a first stirrer (21) and a second stirrer (22). The first stirrer (21) and the second stirrer (22) are both located inside the horizontal tank (1) and between the feed pipe (3) and the discharge pipe (4). The rotation directions of the first stirrer (21) and the second stirrer (22) are opposite to each other. The first stirrer (21) and the second stirrer (22) both include a motor (23) and a stirring shaft (24). The motor (23) is located on the outer wall of the horizontal tank (1). The motor (23) includes a motor shaft (231). The motor shaft (231) is connected to the stirring shaft (24). The stirring shaft (24) is provided with at least three layers of blades (25). The length of each layer of blades (25) is not equal. The center distance between two adjacent layers of blades (25) from bottom to top and the distance from the topmost blade (25) to the motor shaft (231) are not equal.

2. The final polycondensation reactor according to claim 1, characterized in that: The stirring shaft (24) is provided with three layers of blades (25), the length of the three layers of blades (25) increases sequentially from bottom to top, and the length ratio of the three layers of blades (25) is 5:6:

7.

3. The final polycondensation reactor according to claim 1, characterized in that: The center distances between two adjacent blades (25) from bottom to top are L1 and L2, respectively, and the distance from the topmost blade (25) to the motor shaft (231) is L3, where: L1:L2:L3=5:6:

10.

4. The final polycondensation reactor according to claim 2, characterized in that: The blade (25) includes a connecting sleeve (251) disposed on the stirring shaft (24) and at least three blades (252) disposed on the connecting sleeve (251). The connecting sleeve (251) is provided with locking screws (253) for locking the connecting sleeve (251) onto the stirring shaft (24).

5. The final polycondensation reactor according to claim 1, characterized in that: The motor shaft (231) and the stirring shaft (24) are connected by a coupling (26).

6. The final polycondensation reactor according to claim 1, characterized in that: The vertical axis of the first agitator (21) and the vertical axis of the second agitator (22) are symmetrically arranged about the vertical center line of the horizontal tank (1).

7. The final polycondensation reactor according to claim 1, characterized in that: The stirring assembly (2) also includes a controller (27), and the first stirrer (21) and the second stirrer (22) are both connected to the controller (27).

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