Pre-polycondensation reaction kettle

Abstract

The invention relates to a pre-polycondensation reaction kettle which comprises a kettle body, the kettle body is provided with an inner chamber and an outer chamber, the inner chamber is used for pre-polycondensation reaction of esterified materials, a temperature control pipeline is arranged in the outer chamber and close to the outer wall of the inner chamber, and the temperature control pipeline is used for controlling the temperature of the inner chamber; the partition plate is arranged in the inner chamber, the partition plate is used for dividing the inner chamber into an upper reaction chamber and a lower reaction chamber, and the partition plate is provided with a shunting channel; the stirring assembly is arranged at the top of the kettle body, and the stirring end of the stirring assembly extends to the inner chamber of the kettle body; and the turbulent flow assembly is arranged in the inner chamber. Uniform material distribution and efficient heat transfer in the pre-polycondensation reaction process can be achieved, and the reaction efficiency and the product quality are improved.

Description

Technical Field

[0001] The present application relates to the technical field of chemical equipment reactors, and in particular to a pre-polycondensation reactor. Background Art

[0002] At present, the pre-polycondensation reactor is an indispensable and important equipment in chemical production, and is widely used in the pre-polycondensation reaction in the synthesis process of polymer materials. With the continuous progress of industrial production, the design of the pre-polycondensation reactor is also constantly developing and improving. The traditional pre-polycondensation reactor is mainly used for the pre-polycondensation reaction of polymers. The raw materials are fully mixed by heating and stirring, thereby improving the reaction efficiency and product quality.

[0003] In order to overcome the limitations of traditional reactors, the industry usually stirs the materials through a stirrer to enhance the fluidity and mass transfer effect of the liquid; introduces an external cold and hot circulation system to control the temperature of the reaction environment; and in actual operation, there are still problems such as uneven temperature control and uneven material distribution; and when stirring the materials, the materials that have completed the reaction are stirred with the materials that have not completed the reaction for a long time, causing the materials to mix back and affecting the product quality. Especially in large-scale industrial production, these problems are more prominent, resulting in low reaction efficiency and unstable product quality.

[0004] In view of the above-mentioned related technologies, it is necessary to propose a pre-polycondensation reactor to solve one of the above-mentioned technical problems. Summary of the invention

[0005] In order to solve one of the above-mentioned technical problems, the present application provides a pre-polycondensation reactor.

[0006] The present application provides a pre-polycondensation reactor adopting the following technical solution: A pre-polycondensation reactor, comprising: A kettle body, wherein the kettle body is provided with an inner chamber and an outer chamber, wherein the inner chamber is used for pre-polycondensation reaction of the esterified material, and a temperature control pipeline is provided in the outer chamber near the outer wall of the inner chamber and the outer chamber, and the temperature control pipeline is used for controlling the temperature of the inner chamber; A partition, the partition is arranged in the inner chamber, the partition is used to separate the inner chamber into two upper and lower reaction chambers, and a diversion channel is arranged on the partition; A stirring assembly is arranged on the top of the kettle body, and a stirring end of the stirring assembly extends to the inner chamber of the kettle body; and A spoiler assembly is arranged in the inner chamber, and the spoiler assembly includes a circular duct, a plurality of spoiler ducts and a delivery vertical pipe. The circular duct is arranged in the inner chamber, and the outer surface of the circular duct is in contact with the inner wall of the inner chamber. A splicing frame is arranged at the tail end of the spoiler duct, and the splicing frame is connected with the inner side of the circular duct. The bottom end of the delivery vertical pipe is connected with the circular duct. A delivery pipeline is arranged on the top of the delivery vertical pipe. Inert gas is transported in the delivery pipeline, and the stirring assembly is cooperated to realize the spoiler of the pre-condensation reaction material in the inner chamber.

[0007] By adopting the above technical scheme, uniform distribution of materials and efficient heat transfer are achieved during the pre-polycondensation reaction, thereby improving reaction efficiency and product quality. Specifically, the partition design divides the inner chamber into two upper and lower reaction chambers, which helps to improve the uniformity of material mixing and the controllability of the reaction process. At the same time, the spoiler assembly ensures the effective injection of inert gas through the design of circular ducts, spoiler ducts and vertical conveying pipes, further enhancing the disturbance effect of the material, preventing local overheating or uneven cooling, and improving reaction stability. In addition, the precise control capability of the temperature control pipeline ensures the temperature stability of the entire reaction process, avoiding the influence of temperature fluctuations on the reaction results. In summary, the scheme significantly improves the process control of the pre-polycondensation reaction, and improves production efficiency and product quality.

[0008] Optionally, the kettle body includes an upper half kettle and a lower half kettle, and combination blocks are arranged around the outside of the kettle body. The combination blocks are arranged on the outside of the upper half kettle and the lower half kettle respectively, and an adjusting cylinder is nested on the top of one of the combination blocks at the lower half kettle, and the output end of the adjusting cylinder is connected to the bottom of one of the combination blocks at the upper half kettle.

[0009] By adopting the above technical solution, the design of the upper and lower half kettles enables the reactor to be easily disassembled and cleaned, thereby improving the convenience of equipment maintenance; at the same time, the setting of the adjusting cylinder enables rapid opening and closing between the upper and lower half kettles, further improving operating efficiency.

[0010] Optionally, a locking assembly is provided on the outside of the combination block, and the locking assembly includes a locking frame, a snap-on frame and an arc-shaped locking plate. The locking frame is provided on the outside of the combination block at the lower half of the kettle, and the snap-on frame is provided on the outside of the combination frame at the upper half of the kettle. The tail end of the arc-shaped locking plate is rotatably provided in the locking frame, and the end of the arc-shaped locking plate is snap-on in the snap-on frame.

[0011] By adopting the above technical scheme, the locking component design of the pre-condensation reactor can effectively improve the sealing and stability of the equipment, ensure the tight connection between the upper half and the lower half during the pre-condensation reaction, prevent material leakage and the entry of external impurities, thereby improving the reaction efficiency and product quality; at the same time, the structural design of the arc-shaped locking plate makes the locking operation simpler and faster, which is convenient for equipment maintenance and overhaul.

[0012] Optionally, a positioning plate is rotatably provided on the outside of the locking frame, a connecting rod is provided in the middle of the positioning plate, the connecting rod is connected to the tail end of the arc-shaped locking plate, and a plurality of positioning holes are provided through the outside of the positioning plate and the locking frame, and positioning pieces are provided in the overlapping positioning holes.

[0013] By adopting the above technical solution, the sealing and stability of the pre-condensation reactor can be effectively improved; specifically, by providing a rotatable positioning plate and a connecting rod, the arc-shaped locking plate can be more flexibly adjusted in position, thereby ensuring that the locking assembly can maintain a good locking state under various working conditions; at the same time, the design of the positioning holes and the positioning parts is not only convenient for quick installation and disassembly, but also can provide reliable fixing force when locking, further enhancing the overall structural strength and safety of the equipment.

[0014] Optionally, the temperature control pipeline includes a circulating steam pipeline and a cooling water pipeline, both of which are arranged in the outer chamber, and the circulating steam pipeline and the cooling water pipeline are respectively connected to an external steam source and a cooling water source.

[0015] By adopting the above technical scheme, the temperature of the inner chamber during the pre-polycondensation reaction can be effectively controlled to ensure the stability and controllability of the reaction conditions; it can be flexibly adjusted according to actual needs, either by increasing the temperature by connecting to a steam source or by lowering the temperature by connecting to a cooling water source, thereby ensuring the efficient progress of the reaction process.

[0016] Optionally, the stirring assembly includes a driving motor, a rotating rod, a plurality of cross frames and stirring blades. The driving motor is arranged on the top of the kettle body, the rotating rod is rotatably arranged in the inner chamber, the top of the rotating rod is connected to the output end of the driving motor, a plurality of cross frames are sleeved on the rotating rod, and the cross frames are rotatably connected with connecting blocks on all four sides, the end of the connecting block is provided with a groove, and the tail end of the stirring blade is fixedly connected to the groove by bolts.

[0017] By adopting the above technical solution, efficient and uniform material mixing and pre-condensation reaction are achieved; specifically, the driving motor drives the rotating rod to rotate, so that the stirring blades on the cross frame can generate multi-directional stirring force in the inner chamber, ensuring sufficient mixing of the reaction materials; at the same time, the stirring blades are fixed in the grooves of the connecting block by bolts, which is easy to disassemble and replace, thereby improving the maintenance convenience and flexibility of the equipment.

[0018] Optionally, a control valve is provided at the diversion channel to control the opening and closing of the diversion channel.

[0019] By adopting the above technical solution, the material flow and distribution in each reaction chamber can be effectively adjusted, the uniformity and stability of the pre-polycondensation reaction can be ensured, and the reaction efficiency and product quality can be improved.

[0020] Optionally, a connecting pipe is provided on the conveying pipeline, the connecting pipe passes through the kettle body, one end of the connecting pipe extends to the outside of the kettle body, and the connecting pipe is externally connected to an inert gas source.

[0021] By adopting the above technical solution, a stable supply of inert gas is achieved, ensuring an inert environment during the pre-polycondensation reaction, avoiding the mixing of impurities such as oxygen, and improving the safety of the reaction and product quality; at the same time, the design of the connecting pipe makes the introduction of inert gas more convenient and controllable, and facilitates operation and maintenance.

[0022] Optionally, a feed pipe is arranged on the top of the kettle body, and a vacuum exhaust pipe is arranged on the top of the kettle body and away from the feed pipe.

[0023] By adopting the above technical scheme, the raw materials can smoothly enter the kettle body for pre-polycondensation reaction, ensuring the continuity and stability of the reaction process; at the same time, the setting of the vacuum exhaust pipe can effectively remove the air and other volatile substances in the kettle body, maintain the pressure balance inside the kettle body, ensure the stability of the reaction conditions, thereby improving the efficiency of the pre-polycondensation reaction and the product quality.

[0024] Optionally, a supporting frame is provided at the bottom of the kettle body, the supporting frame supports the kettle body, and a discharge pipe is provided at the bottom of the kettle body.

[0025] By adopting the above technical solution, the support frame can effectively support the kettle body, ensuring that the precondensation reactor remains stable during operation and preventing structural damage or safety hazards caused by the weight of the equipment or vibration during the reaction. The setting of the discharge pipe facilitates the discharge of materials after the reaction is completed, improves production efficiency, and reduces the workload of operators.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The coordinated work of the stirring component and the spoiler component not only promotes the mixing of materials through mechanical stirring, but also further enhances the spoiler effect of the materials by conveying inert gas, greatly improving the uniformity and reaction rate of the reaction; 2. The partition separates the inner chamber into two upper and lower reaction chambers, and realizes the uniform distribution of materials between the chambers through the diversion channel, which effectively avoids the problems of local overheating or uneven cooling and improves the uniformity and controllability of the reaction; 3. The reactor body is divided into the upper half and the lower half, which is convenient for disassembly and maintenance of the reactor. At the same time, the upper and lower parts are reliably connected through the locking assembly, ensuring the sealing and safety of the reactor in high temperature and high pressure environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional view of a pre-polycondensation reactor in the present application.

[0028] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at point A in the middle.

[0029] Figure 3 yes Figure 1 A magnified schematic diagram of the structure at point B in the middle.

[0030] Figure 4 It is a plan view of a pre-polycondensation reactor in the present application (the upper half of the reactor is a cross-section view with a locking assembly).

[0031] Figure 5 yes Figure 4 Enlarged schematic diagram of the structure at C in the middle.

[0032] In the figure: 1, kettle body; 11, inner chamber; 12, outer chamber; 13, temperature control pipeline; 131, circulating steam pipeline; 132, cooling water pipeline; 14, upper half kettle; 15, lower half kettle; 16, combination block; 161, regulating cylinder; 17, feeding pipeline; 18, vacuum discharge pipeline; 19, discharge pipeline; 2, partition; 21, diversion channel; 22, control valve; 3, stirring assembly; 31, driving motor; 32, rotation Rod; 33, cross frame; 34, stirring piece; 35, connecting block; 36, groove; 4, spoiler assembly; 41, circular duct; 42, spoiler duct; 43, delivery vertical pipe; 44, splicing frame; 45, delivery pipeline; 46, connecting pipe; 5, locking assembly; 51, locking frame; 52, snap-on frame; 53, arc-shaped locking piece; 54, positioning plate; 55, connecting rod; 56, positioning hole; 57, positioning piece; 6, supporting frame. DETAILED DESCRIPTION

[0033] The following is combined with the accompanying drawings Figure 1-Figure 5 This application is described in further detail.

[0034] Example 1, reference Figure 1 The embodiment of the present application discloses a pre-polycondensation reactor, comprising: a reactor body 1, a partition 2, a stirring component 3 and a spoiler component 4.

[0035] The kettle body 1 is provided with an inner chamber 11 and an outer chamber 12, the inner chamber 11 is used for pre-polycondensation reaction of the esterified material, and a temperature control pipeline 13 is provided in the outer chamber 12 near the outer wall of the inner chamber 11, and the temperature control pipeline 13 is used to control the temperature of the inner chamber 11; a partition 2 is provided in the inner chamber 11, and the partition 2 is used to divide the inner chamber 11 into two upper and lower reaction chambers, and a diversion channel 21 is provided on the partition 2; a stirring component 3 is provided on the top of the kettle body 1, and the stirring end of the stirring component 3 extends to the inner chamber 11 of the kettle body 1; a spoiler component 4 is provided in the inner chamber 11, and the spoiler component 4 comprises a circular conduit 41, a plurality of flow-disturbing conduits 42 and a delivery vertical pipe 43. The circular conduit 41 is arranged in the inner chamber 11, and the outer surface of the circular conduit 41 is in contact with the inner wall of the inner chamber 11. A splicing frame 44 is arranged at the tail end of the flow-disturbing conduit 42, and the splicing frame 44 is connected with the inner side of the circular conduit 41. The bottom end of the delivery vertical pipe 43 is connected with the circular conduit 41. A delivery pipeline 45 is arranged at the top of the delivery vertical pipe 43. Inert gas is transported in the delivery pipeline 45, and the stirring assembly 3 is cooperated to realize the flow disturbance of the pre-polycondensation reaction material in the inner chamber 11.

[0036] The uniform distribution of materials and efficient heat transfer during the pre-condensation reaction are achieved, and the reaction efficiency and product quality are improved. Specifically, the design of the partition 2 allows the inner chamber 11 to be divided into two upper and lower reaction chambers, so that the materials after the reaction are not transported in time and remixed with the unreacted materials in the inner chamber 11, which helps to improve the uniformity of material mixing and the controllability of the reaction process. At the same time, the spoiler component 4 ensures the effective injection of inert gas through the design of the circular conduit 41, the spoiler conduit 42 and the delivery vertical pipe 43, that is, the circular conduit 41 is arranged along the inner wall of the inner chamber 11, the spoiler conduit 42 is arranged in a circle, and the pipe head is inclined at an angle to uniformly introduce the inert gas, further enhancing the disturbance effect of the material, preventing local overheating or uneven cooling, and improving the reaction stability. In addition, the precise control capability of the temperature control pipeline 13 ensures the temperature stability of the entire reaction process and avoids the influence of temperature fluctuations on the reaction results. In summary, the scheme significantly improves the process control of the pre-condensation reaction, improves production efficiency and product quality.

[0037] refer to Figure 3In the present embodiment, more specifically, the temperature control pipeline 13 includes a circulating steam pipeline 131 and a cooling water pipeline 132, both of which are arranged in the outer chamber 12. The circulating steam pipeline 131 and the cooling water pipeline 132 are respectively connected to an external steam source and a cooling water source, which can effectively control the temperature of the inner chamber 11 during the pre-polycondensation reaction, and ensure the stability and controllability of the reaction conditions; it can be flexibly adjusted according to actual needs, and the temperature can be increased by connecting to a steam source, or the temperature can be lowered by connecting to a cooling water source, thereby ensuring the efficient progress of the reaction process.

[0038] refer to Figure 1 and Figure 4 In the present embodiment, more specifically, the stirring assembly 3 comprises a driving motor 31, a rotating rod 32, a plurality of cross frames 33 and stirring blades 34. The driving motor 31 is arranged at the top of the kettle body 1, the rotating rod 32 is rotatably arranged in the inner chamber 11, the top of the rotating rod 32 is connected to the output end of the driving motor 31, and a plurality of cross frames 33 are sleeved on the rotating rod 32. The four sides of the cross frame 33 are rotatably connected with a connecting block 35, and the end of the connecting block 35 is provided with a groove 36. The tail end of the stirring blade 34 is fixedly connected in the groove 36 by bolts, so as to realize efficient and uniform material mixing and pre-condensation reaction; specifically, the driving motor 31 drives the rotating rod 32 to rotate, so that the stirring blade 34 on the cross frame 33 can generate multi-directional stirring force in the inner chamber 11, ensuring sufficient mixing of the reaction materials; at the same time, the stirring blade 34 is fixed in the groove 36 of the connecting block 35 by bolts, which is convenient for disassembly and replacement, thereby improving the maintenance convenience and flexibility of the equipment.

[0039] refer to Figure 1 In the present embodiment, more specifically, a control valve 22 is provided at the diversion channel 21 for controlling the opening and closing of the diversion channel 21, thereby effectively adjusting the material flow and distribution in each reaction chamber, ensuring the uniformity and stability of the pre-polycondensation reaction, and improving the reaction efficiency and product quality.

[0040] refer to Figure 4 In the present embodiment, more specifically, a connecting pipe 46 is provided on the delivery pipeline 45, the connecting pipe 46 passes through the kettle body 1, one end of the connecting pipe 46 extends to the outside of the kettle body 1, and the connecting pipe 46 is externally connected to an inert gas source, thereby realizing a stable supply of inert gas, ensuring an inert environment during the pre-polycondensation reaction, avoiding the mixing of impurities such as oxygen, and improving the safety of the reaction and the quality of the product; at the same time, the design of the connecting pipe 46 makes the introduction of the inert gas more convenient and controllable, and is easy to operate and maintain.

[0041] refer to Figure 1In the present embodiment, more specifically, a feed pipe 17 is provided on the top of the kettle body 1, and a vacuum exhaust pipe 18 is provided on the top of the kettle body 1 and away from the feed pipe 17, so that the raw materials can smoothly enter the kettle body 1 for pre-polycondensation reaction, thereby ensuring the continuity and stability of the reaction process; at the same time, the setting of the vacuum exhaust pipe 18 can effectively remove the air and other volatile substances in the kettle body 1, maintain the pressure balance inside the kettle body 1, ensure the stability of the reaction conditions, and thus improve the efficiency of the pre-polycondensation reaction and the product quality.

[0042] refer to Figure 4 In the present embodiment, more specifically, a supporting frame 6 is provided at the bottom of the kettle body 1, and the supporting frame 6 supports the kettle body 1. A discharge pipe 19 is provided at the bottom of the kettle body 1. The supporting frame 6 can effectively support the kettle body 1 to ensure that the pre-polycondensation reactor remains stable during operation and prevent structural damage or safety hazards caused by equipment weight or vibration during the reaction process; the setting of the discharge pipe 19 facilitates the discharge of materials after the reaction is completed, improves production efficiency, and reduces the workload of operators.

[0043] The implementation principle of a pre-condensation reactor in an embodiment of the present application is as follows: by setting a multi-layer partition 2 to divide the inner chamber 11 into multiple reaction chambers, the distribution uniformity of the material can be effectively improved to avoid the occurrence of local overheating or overcooling; the precise control of the temperature control pipeline 13 enables the temperature of each reaction chamber to be accurately maintained, thereby improving the stability and controllability of the reaction; the synergistic effect of the stirring component 3 and the spoiler component 4 can significantly improve the mixing effect of the material and promote the reaction.

[0044] Example 2, reference Figure 4 The difference between this embodiment and the first embodiment is that: the kettle body 1 includes an upper kettle half 14 and a lower kettle half 15, and assembly blocks 16 are arranged around the outside of the kettle body 1. The assembly blocks 16 are arranged on the outside of the upper kettle half 14 and the lower kettle half 15 respectively, and an adjusting cylinder 161 is nested at the top of one of the assembly blocks 16 at the corresponding lower kettle half 15, and the output end of the adjusting cylinder 161 is connected to the bottom of one of the assembly blocks 16 at the upper kettle half 14. The design of the upper kettle half 14 and the lower kettle half 15 makes it easy to disassemble and clean the reactor, thereby improving the convenience of equipment maintenance; at the same time, the setting of the adjusting cylinder 161 realizes the rapid opening and closing between the upper kettle half 14 and the lower kettle half 15, further improving the operating efficiency.

[0045] refer to Figure 5In the present embodiment, more specifically, a locking assembly 5 is provided on the outside of the assembly block 16, and the locking assembly 5 includes a locking frame 51, a clamping frame 52 and an arc-shaped locking piece 53. The locking frame 51 is arranged on the outside of the assembly block 16 at the lower half kettle 15, and the clamping frame 52 is arranged on the outside of the assembly frame at the upper half kettle 14. The tail end of the arc-shaped locking piece 53 is rotatably arranged in the locking frame 51, and the end of the arc-shaped locking piece 53 is clamped in the clamping frame 52. The locking assembly 5 design of the pre-condensation reactor can effectively improve the sealing and stability of the equipment, ensure the tight connection between the upper half kettle 14 and the lower half kettle 15 during the pre-condensation reaction process, prevent material leakage and external impurities from entering, thereby improving the reaction efficiency and product quality; at the same time, the structural design of the arc-shaped locking piece 53 makes the locking operation simpler and faster, and is convenient for equipment maintenance and overhaul.

[0046] refer to Figure 5 In the present embodiment, more specifically, a positioning plate 54 is rotatably provided on the outside of the locking frame 51, a connecting rod 55 is provided in the middle of the positioning plate 54, the connecting rod 55 is connected to the tail end of the arc-shaped locking piece 53, and a plurality of positioning holes 56 are provided through the outside of the positioning plate 54 and the locking frame 51, wherein the overlapping positioning holes 56 are provided with positioning members 57, which can effectively improve the sealing and stability of the pre-condensation reactor; specifically, by providing a rotatable positioning plate 54 and a connecting rod 55, the arc-shaped locking piece 53 can be more flexibly adjusted in position, thereby ensuring that the locking assembly 5 can maintain a good locking state under various working conditions; at the same time, the design of the positioning holes 56 and the positioning members 57 is not only convenient for quick installation and disassembly, but also can provide reliable fixing force when locking, further enhancing the overall structural strength and safety of the equipment.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pre-polycondensation reactor, characterized in that: include: A kettle body (1), wherein the kettle body (1) is provided with an inner chamber (11) and an outer chamber (12), wherein the inner chamber (11) is used for pre-polycondensation reaction of the esterified material, and a temperature control pipeline (13) is provided in the outer chamber (12) near the outer wall of the inner chamber (11), and the temperature control pipeline (13) is used for controlling the temperature of the inner chamber (11); a partition (2) disposed in the inner chamber (11), the partition (2) being used to separate the inner chamber (11) into two upper and lower reaction chambers, and a flow diversion channel (21) being disposed on the partition (2); A stirring assembly (3) is arranged on the top of the kettle body (1), and a stirring end of the stirring assembly (3) extends to the inner chamber (11) of the kettle body (1); as well as A spoiler assembly (4) is arranged in the inner chamber (11), the spoiler assembly (4) comprising a circular conduit (41), a plurality of spoiler conduits (42) and a delivery vertical pipe (43), the circular conduit (41) being arranged in the inner chamber (11), and the outer surface of the circular conduit (41) being in contact with the inner wall of the inner chamber (11), a splicing frame (44) being arranged at the tail end of the spoiler conduit (42), the splicing frame (44) being in communication with the inner side of the circular conduit (41), the bottom end of the delivery vertical pipe (43) being in communication with the circular conduit (41), the top of the delivery vertical pipe (43) being arranged with a delivery pipeline (45), in which inert gas is delivered, and in cooperation with the stirring assembly (3) to achieve spoiler of the pre-polycondensation reaction material in the inner chamber (11).

2. A pre-polycondensation reactor according to claim 1, characterized in that: The kettle body (1) comprises an upper kettle half (14) and a lower kettle half (15). Assembly blocks (16) are arranged around the outside of the kettle body (1). The assembly blocks (16) are arranged outside the upper kettle half (14) and the lower kettle half (15). An adjusting cylinder (161) is nested at the top of one of the assembly blocks (16) at the lower kettle half (15). The output end of the adjusting cylinder (161) is connected to the bottom of one of the assembly blocks (16) at the upper kettle half (14).

3. A pre-polycondensation reactor according to claim 2, characterized in that: A locking assembly (5) is arranged outside the combination block (16), and the locking assembly (5) comprises a locking frame (51), a snap-on frame (52) and an arc-shaped locking piece (53). The locking frame (51) is arranged outside the combination block (16) at the lower half kettle (15), and the snap-on frame (52) is arranged outside the combination frame at the upper half kettle (14). The tail end of the arc-shaped locking piece (53) is rotatably arranged in the locking frame (51), and the end of the arc-shaped locking piece (53) is snap-on in the snap-on frame (52).

4. A pre-polycondensation reactor according to claim 3, characterized in that: A positioning plate (54) is rotatably arranged on the outside of the locking frame (51), a connecting rod (55) is arranged in the middle of the positioning plate (54), and the connecting rod (55) is connected to the tail end of the arc-shaped locking piece (53), and a plurality of positioning holes (56) are penetrated through the outside of the positioning plate (54) and the locking frame (51), wherein positioning pieces (57) are arranged in the overlapping positioning holes (56).

5. A pre-polycondensation reactor according to claim 1, characterized in that: The temperature control pipeline (13) comprises a circulating steam pipeline (131) and a cooling water pipeline (132), both of which are arranged in the outer chamber (12); the circulating steam pipeline (131) and the cooling water pipeline (132) are respectively connected to an external steam source and a cooling water source.

6. A pre-polycondensation reactor according to claim 1, characterized in that: The stirring assembly (3) comprises a driving motor (31), a rotating rod (32), a plurality of cross frames (33) and a stirring blade (34); the driving motor (31) is arranged on the top of the kettle body (1); the rotating rod (32) is rotatably arranged in the inner chamber (11); the top end of the rotating rod (32) is connected to the output end of the driving motor (31); a plurality of cross frames (33) are sleeved on the rotating rod (32); the four sides of the cross frame (33) are rotatably connected to connecting blocks (35); the end of the connecting block (35) is provided with a groove (36); the tail end of the stirring blade (34) is fixedly connected to the groove (36) by bolts.

7. A pre-polycondensation reactor according to claim 1, characterized in that: A control valve (22) is provided at the diversion channel (21) for controlling the opening and closing of the diversion channel (21).

8. The pre-polycondensation reactor according to claim 1, characterized in that: The delivery pipeline (45) is provided with a connecting pipe (46), the connecting pipe (46) passes through the kettle body (1), one end of the connecting pipe (46) extends to the outside of the kettle body (1), and the connecting pipe (46) is externally connected to an inert gas source.

9. A pre-polycondensation reactor according to claim 1, characterized in that: A feeding pipe (17) is arranged at the top of the kettle body (1), and a vacuum exhaust pipe (18) is arranged at the top of the kettle body (1) and away from the feeding pipe (17).

10. The pre-polycondensation reactor according to claim 1, characterized in that: A supporting frame (6) is arranged at the bottom of the kettle body (1), and the supporting frame (6) supports the kettle body (1). A discharge pipe (19) is arranged at the bottom of the kettle body (1).

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