Tubular reaction device for polycarbonate polymerization reaction
By setting up prepolymerization, polycondensation, and final polymerization reaction components in the polycarbonate polymerization reactor, and combining them with cooling components and temperature sensors to dynamically adjust the flow rate of the cooling medium, the problem of insufficient heat transfer efficiency is solved, and precise temperature control and reaction stability are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CANGZHOU DAHUA CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-12
AI Technical Summary
Existing tubular reactors have insufficient heat transfer efficiency in polycarbonate polymerization reactions, resulting in a mismatch between temperature control and reaction stages, which can easily lead to local overheating and temperature fluctuations.
A tubular reaction device for polycarbonate polymerization was designed, including a prepolymerization section, a polycondensation section, and a final polymerization section. Each section has a cooling component and a temperature sensor on the outside of the spiral tube. The flow rate of the cooling medium is dynamically adjusted by a PLC control system to meet the differentiated temperature control requirements of different reaction stages.
It achieves precise temperature control at different reaction stages, avoids local overheating, reduces temperature fluctuations, and improves heat transfer efficiency and reaction effect.
Smart Images
Figure CN224221322U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of chemical technology, specifically relating to a tubular reaction device for polycarbonate polymerization. Background Technology
[0002] Polycarbonate (PC) is a strong and tough thermoplastic resin, a high-molecular polymer containing carbonate groups in its molecular chain. Based on the structure of the ester groups, it can be classified into various types such as aliphatic, aromatic, and aliphatic-aromatic. Due to the unique structure of polycarbonate, it has become the fastest-growing general-purpose engineering plastic among the five major engineering plastics. The polymerization reaction of polycarbonate reactants is a strongly exothermic process. During the reaction, a certain temperature needs to be maintained within the reactor. Precise temperature control within the reactor is necessary to prevent side reactions and ensure product quality. To achieve temperature control, a PLC (Programmable Logic Controller) system is often used to receive temperature data in real time and perform temperature regulation. In existing technologies, reactors for polycarbonate polymerization reactions are generally divided into batch reactors and tubular reactors. Although tubular reactors can achieve continuous production, they still have certain problems. Traditional spiral tubular reactors use a single countercurrent cooling medium, resulting in poor mass transfer and insufficient heat transfer efficiency within the tubes. This makes it difficult to meet the differentiated temperature control requirements of different reaction stages, leading to localized overheating and temperature fluctuations. Utility Model Content
[0003] The purpose of this invention is to provide a tubular reactor for polycarbonate polymerization, which aims to solve the problem of insufficient heat transfer efficiency of tubular reactors in polycarbonate polymerization, resulting in a mismatch between temperature control and reaction stages.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a tubular reaction apparatus for polycarbonate polymerization, comprising:
[0005] A prepolymerization section reaction assembly, comprising a prepolymerization section spiral tube and a prepolymerization section cooling assembly, wherein the prepolymerization section spiral tube is spirally wound around the outside of the prepolymerization section cooling assembly, and a prepolymerization section temperature sensor is provided inside the prepolymerization section spiral tube and the prepolymerization section temperature sensor is connected to a PLC control system.
[0006] A polycondensation section reaction assembly, comprising a polycondensation section spiral tube and a polycondensation section cooling assembly, wherein the polycondensation section spiral tube is spirally wound around the outside of the polycondensation section cooling assembly, and a polycondensation section temperature sensor is disposed inside the polycondensation section spiral tube and connected to a PLC control system; and
[0007] The final polymerization stage reaction assembly includes a final polymerization stage spiral tube and a final polymerization stage cooling assembly. The final polymerization stage spiral tube is spirally wound around the outside of the final polymerization stage cooling assembly. A final polymerization stage temperature sensor is installed inside the final polymerization stage spiral tube and is connected to a PLC control system.
[0008] The prepolymerization section spiral pipe, the polycondensation section spiral pipe, and the final polymerization section spiral pipe are connected sequentially by a pipe, and the spiral directions of the three are consistent. The reactant enters through the left end of the prepolymerization section spiral pipe and exits through the right end of the final polymerization section spiral pipe.
[0009] In one possible implementation, the pitch of the prepolymer section spiral fitting is smaller than the pitch of the polycondensation section spiral fitting and smaller than the pitch of the final polymerization section spiral fitting.
[0010] In one possible implementation, the pitch of the polycondensation section spiral fitting is a gradually expanding pitch, and the pitch of the final polymerization section spiral fitting is a gradually expanding pitch.
[0011] In one possible implementation, multiple sets of guide vanes are provided inside the prepolymerization section spiral fitting, the polycondensation section spiral fitting, and the final polymerization section spiral fitting.
[0012] In one possible implementation, the guide vanes are staggered along both sides of the inner wall of the prepolymerization section spiral fitting, the polycondensation section spiral fitting, and the final polymerization section spiral fitting.
[0013] In one possible implementation, the polycondensation section spiral fitting is provided with multiple sets of static mixing plates, which are used to improve the mixing uniformity of the reactants.
[0014] In one possible implementation, the static mixing plate is provided with diversion holes.
[0015] In one possible implementation, the prepolymer section cooling assembly is provided with a prepolymer section cooling pipe, which is a spiral pipe.
[0016] In one possible implementation, the helical direction of the prepolymer section cooling pipe is opposite to the helical direction of the prepolymer section spiral pipe.
[0017] In one possible implementation, a first sampling port is provided on the pipe between the prepolymerization section spiral fitting and the polycondensation section spiral fitting, and a second sampling port is provided on the pipe between the polycondensation section spiral fitting and the final polymerization section spiral fitting.
[0018] The beneficial effects of the tubular reaction apparatus for polycarbonate polymerization provided by this utility model are as follows:
[0019] Compared with existing technologies, this method, based on the stages of polycarbonate polymerization, includes a prepolymerization stage reaction assembly, a polycondensation stage reaction assembly, and a final polymerization stage reaction assembly. The prepolymerization stage is the first stage of the polymerization reaction, characterized by high temperatures. The prepolymerization stage cooling assembly dissipates heat from the outer prepolymerization stage spiral tube. This stage releases a significant amount of heat. The prepolymerization stage cooling assembly and prepolymerization stage temperature sensors monitor the temperature inside the prepolymerization stage spiral tube in real time and feed this temperature feedback to the PLC control system, dynamically adjusting the flow rate of the cooling medium within the prepolymerization stage cooling assembly. The polycondensation stage is the second stage of the polymerization reaction, characterized by medium temperatures. This stage releases less heat. The polycondensation stage temperature sensors monitor the temperature inside the polycondensation stage spiral tube in real time. The temperature is measured and fed back to the PLC control system, which dynamically adjusts the flow rate of the cooling medium in the polycondensation section cooling assembly. The final polymerization stage is the third stage of the polymerization reaction, which is at a low temperature. The heat release in this stage is further reduced. The final polymerization stage temperature sensor monitors the temperature inside the final polymerization stage spiral pipe in real time and feeds the temperature back to the PLC control system, which dynamically adjusts the flow rate of the cooling medium in the final polymerization stage cooling assembly. The prepolymerization stage cooling assembly, polycondensation stage cooling assembly, and final polymerization stage cooling assembly can be adjusted separately according to the actual situation. By adjusting the flow rate of the cooling medium, different cooling intensities are provided for the three stages of the polymerization reaction, meeting the differentiated temperature control requirements of different reaction stages, avoiding local overheating, and reducing temperature fluctuations. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 Schematic diagram of the structure of the tubular reaction apparatus for polycarbonate polymerization provided in the embodiments of this utility model Figure 1 ;
[0022] Figure 2 This is a schematic diagram of the internal structure of the prepolymerization section cooling assembly, the polycondensation section cooling assembly, and the final polymerization section cooling assembly used in the embodiments of this utility model.
[0023] Figure 3 This is a schematic diagram of the internal structure of the prepolymerized spiral tube used in the embodiment of this utility model along its length.
[0024] Figure 4 This is a schematic diagram of the structure of the static mixing plate used in the embodiment of this utility model.
[0025] In the diagram: 1. Prepolymerization section spiral fitting; 2. Prepolymerization section temperature sensor; 3. Prepolymerization section cooling assembly; 4. Prepolymerization section cooling fitting; 5. Prepolymerization section support pipe; 6. Polycondensation section spiral fitting; 7. Polycondensation section temperature sensor; 8. Polycondensation section cooling assembly; 9. Polycondensation section cooling fitting; 10. Polycondensation section support pipe; 11. Final polymerization section spiral fitting; 12. Final polymerization section temperature sensor; 13. Final polymerization section cooling assembly; 14. Final polymerization section cooling fitting; 15. Final polymerization section support pipe; 16. First sampling port; 17. Second sampling port; 18. Guide vane; 19. Static mixing plate; 20. Diverter hole; 21. Third sampling port. Detailed Implementation
[0026] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0027] Please refer to Figure 1 as well as Figure 2 This invention provides a specific embodiment of a tubular reaction device for polycarbonate polymerization, comprising a prepolymerization stage reaction assembly, a polycondensation stage reaction assembly, and a final polymerization stage reaction assembly. The prepolymerization stage reaction assembly includes a prepolymerization stage spiral tube 1 and a prepolymerization stage cooling assembly 3. The prepolymerization stage spiral tube 1 is spirally wound around the outside of the prepolymerization stage cooling assembly 3. A prepolymerization stage temperature sensor 2 is installed inside the prepolymerization stage spiral tube 1 and connected to a PLC control system. The polycondensation stage reaction assembly includes a polycondensation stage spiral tube 6 and a polycondensation stage cooling assembly 8. The polycondensation stage spiral tube 6 is spirally wound around the outside of the polycondensation stage cooling assembly 8. The component 6 is equipped with a polycondensation section temperature sensor 7, which is connected to the PLC control system. The final polymerization section reaction assembly includes a final polymerization section spiral tube 11 and a final polymerization section cooling assembly 13. The final polymerization section spiral tube 11 is spirally wound around the outside of the final polymerization section cooling assembly 13. A final polymerization section temperature sensor 12 is installed inside the final polymerization section spiral tube 11, which is connected to the PLC control system. The prepolymerization section spiral tube 1, the polycondensation section spiral tube 6, and the final polymerization section spiral tube 11 are connected sequentially through pipes, and the spiral directions of the three are consistent. The reactant enters through the left end of the prepolymerization section spiral tube 1 and exits through the right end of the final polymerization section spiral tube 11.
[0028] This invention provides a tubular reaction device for polycarbonate polymerization. Compared with the prior art, it is equipped with a prepolymerization stage reaction component, a polycondensation stage reaction component, and a final polymerization stage reaction component according to the stages of the polycarbonate polymerization reaction. The prepolymerization stage is the first stage of the polymerization reaction, which is at a high temperature. The prepolymerization stage cooling component 3 dissipates heat from the prepolymerization stage spiral tube 1 on its outer side. A large amount of heat is released in this stage. The prepolymerization stage cooling component 3 and the prepolymerization stage temperature sensor 2 monitor the temperature inside the prepolymerization stage spiral tube 1 in real time and feed the temperature back to the PLC control system to dynamically adjust the flow rate of the cooling medium in the prepolymerization stage cooling component 3. The polycondensation stage is the second stage of the polymerization reaction, which is at a medium temperature. The amount of heat released in this stage is reduced. The polycondensation stage temperature sensor 7 monitors the temperature inside the polycondensation stage spiral tube. The temperature inside component 6 is monitored in real time and fed back to the PLC control system to dynamically adjust the flow rate of the cooling medium in the polycondensation section cooling component 8. The final polymerization stage is the third stage of the polymerization reaction, which is at a low temperature. The heat released in this stage is further reduced. The final polymerization stage temperature sensor 12 monitors the temperature inside the final polymerization stage spiral tube 11 in real time and feeds back to the PLC control system to dynamically adjust the flow rate of the cooling medium in the final polymerization stage cooling component 13. The prepolymerization stage cooling component 3, the polycondensation stage cooling component 8, and the final polymerization stage cooling component 13 can be adjusted separately according to the actual situation. By adjusting the flow rate of the cooling medium, different cooling intensities are provided for the three stages of the polymerization reaction to meet the differentiated temperature control requirements of different reaction stages, avoid local overheating, and reduce temperature fluctuations.
[0029] For details, please refer to Figure 1 as well as Figure 2The right end of the prepolymerization section spiral fitting 1 is connected to the left end of the polycondensation section spiral fitting 6 via a pipe. The right end of the polycondensation section spiral fitting 6 is connected to the left end of the final polymerization section spiral fitting 11 via a pipe. The pipe between the prepolymerization section spiral fitting 1 and the polycondensation section spiral fitting 6 is arranged along the length of the prepolymerization section cooling assembly 3. The pipe between the polycondensation section spiral fitting 6 and the final polymerization section spiral fitting is arranged along the length of the polycondensation section cooling assembly 8. The reactants enter through the left end of the prepolymerization section spiral fitting 1 and exit through the right end of the final polymerization section spiral fitting 11. The spiral directions of the prepolymerization section spiral fitting 1, the polycondensation section spiral fitting 6, and the final polymerization section spiral fitting are consistent, facilitating the flow of the reactants. The prepolymerization section spiral fitting 1, the polycondensation section spiral fitting 6, and the final polymerization section spiral fitting are all composed of multiple individual pipe fittings spliced together and can be connected by flanges, facilitating the replacement of individual pipe fittings. They are adaptable to the production of various products. The prepolymerization section cooling assembly 3, the polycondensation section cooling assembly 8, and the final polymerization section cooling assembly 13 are separate units. Each component has its own cooling medium supply pipe, cooling medium drain pipe, and regulating valve. The regulating valve is located on the cooling medium supply pipe and is used to regulate the flow rate of the cooling medium. The three components can be controlled independently. The cooling medium supply pipe is connected to the right end of the prepolymerization section cooling component 3, the polycondensation section cooling component 8, and the final polymerization section cooling component 13. The cooling medium drain pipe is connected to the left end of the prepolymerization section cooling component 3, the polycondensation section cooling component 8, and the final polymerization section cooling component 13. The flow direction of the cooling medium inside the prepolymerization section cooling component 3, the polycondensation section cooling component 8, and the final polymerization section cooling component 13 is opposite to the flow direction of the reactants inside the prepolymerization section spiral tube 1, the polycondensation section spiral tube 6, and the final polymerization section spiral tube, which helps to enhance the cooling effect on the reactants. The prepolymerization section temperature sensor 2 is located in the middle section of the prepolymerization section spiral tube 1, the polycondensation section temperature sensor 7 is located in the middle section of the polycondensation section spiral tube 6, and the final polymerization section temperature sensor 12 is located in the middle section of the final polymerization section spiral tube 11.
[0030] As a specific embodiment of the tubular reaction apparatus for polycarbonate polymerization provided by this utility model, please refer to Figure 1 as well as Figure 2 The pitch of the prepolymer section spiral fitting 1 is less than the pitch of the polycondensation section spiral fitting 6, and less than the pitch of the final polymerization section spiral fitting 11.
[0031] For details, please refer to Figure 1 as well as Figure 2 The pitch range of the prepolymer section spiral fitting 1 is between 40 and 100 mm, which is a small pitch range. This helps to increase the length of the pipe wall of the prepolymer section spiral fitting 1, increase the contact area between the prepolymer section spiral fitting 1 and the outside world, help to dissipate heat inside the prepolymer section spiral fitting 1, and enhance the cooling effect of the prepolymer section cooling assembly 3.
[0032] As a specific embodiment of the tubular reaction apparatus for polycarbonate polymerization provided by this utility model, please refer to Figure 1 as well as Figure 2 The pitch of the spiral fitting 6 in the polycondensation section is a gradually expanding pitch, and the pitch of the spiral fitting 11 in the final polymerization section is a gradually expanding pitch.
[0033] For details, please refer to Figure 1 as well as Figure 2 The pitch of the polycondensation section spiral fitting 6 gradually increases as it moves away from the prepolymerization section spiral fitting 1, with the pitch range being between 100 and 300 mm. Similarly, the pitch of the final polymerization section spiral fitting 11 gradually increases as it moves away from the prepolymerization section spiral fitting 1, with the pitch range being between 100 and 300 mm. This gradually increasing pitch helps to reduce the flow rate of the reactants in the polycondensation section spiral fitting 6 and the final polymerization section spiral fitting 11, prolonging the reaction time and ensuring that the reaction proceeds fully.
[0034] As a specific embodiment of the tubular reaction apparatus for polycarbonate polymerization provided by this utility model, please refer to Figure 1 as well as Figure 3 Multiple sets of guide vanes 18 are provided in the prepolymerization section spiral fitting 1, the polycondensation section spiral fitting 6, and the final polymerization section spiral fitting 11.
[0035] For details, please refer to Figure 1 as well as Figure 3 Multiple sets of guide vanes 18 are provided, and are respectively installed on the inner sidewalls of the prepolymerization section spiral pipe fitting 1, the condensation section spiral pipe fitting 6, and the final polymerization section spiral pipe fitting 11. The guide vanes 18 are detachable. In the tangential direction of the position where the guide vanes 18 are installed in the pipe fitting, the guide vanes 18 are inclined. The angle between the guide vanes 18 and the tangential direction of the pipe fitting is in the range of 30° to 60°. The first end of the guide vane 18 close to the inner wall of the pipe fitting is in contact with the inner wall of the pipe fitting. The guide vanes 18 are detachable. The guide vanes 18 can be replaced as needed, the number of guide vanes 18 can be adjusted, and the angle of the guide vanes 18 can be changed. The guide vanes 18 can change the fluid direction to enhance turbulence and reduce the mixing dead angle caused by laminar flow. As one embodiment of the detachable installation of the guide vanes 18, a mounting seat can be provided on the inner wall of the pipe fitting. The sidewall of the first end of the guide vane 18 is in contact with the sidewall of the mounting seat. The guide vane 18 is detachably fixed to the sidewall of the mounting seat by bolts.
[0036] As a specific embodiment of the tubular reaction apparatus for polycarbonate polymerization provided by this utility model, please refer to Figure 1 as well as Figure 3 The guide vanes 18 are staggered along both sides of the inner wall of the prepolymerization section spiral fitting 1, the polycondensation section spiral fitting 6, and the final polymerization section spiral fitting 11.
[0037] For details, please refer to Figure 1 as well as Figure 3 Along the length of the prepolymerization section spiral fitting 1, the polycondensation section spiral fitting 6, and the final polymerization section spiral fitting 11, multiple sets of guide vanes 18 are respectively arranged on both sides of the inner wall of the fitting. The guide vanes 18 on both sides of the inner wall of the fitting are staggered to further reduce the mixing dead angle. The opening formed between the guide vane 18 on one side and the fitting faces the flow direction of the reactant, while the opening formed between the guide vane 18 on the other side and the fitting faces the opposite direction of the flow direction of the reactant.
[0038] As a specific embodiment of the tubular reaction apparatus for polycarbonate polymerization provided by this utility model, please refer to Figure 1 as well as Figure 4 The spiral tube 6 of the polycondensation section is equipped with multiple sets of static mixing plates 19, which are used to improve the mixing uniformity of the reactants.
[0039] For details, please refer to Figure 1 as well as Figure 4 The static mixing plate 19 is detachably installed inside the polycondensation section spiral tube 6. The outer edge of the static mixing plate 19 matches the inner sidewall of the polycondensation section spiral tube 6. The reactants pass through the static mixing plate 19, which diverts the reactants. After passing through the static mixing plate 19, the reactants re-merge, which helps to improve the mixing uniformity of the reactants in the low viscosity stage. As one embodiment of the detachable installation of the static mixing plate 19, a fixing seat can be provided on the inner wall of the tube. The sidewall of the edge of the static mixing plate 19 is attached to the sidewall of the fixing seat. The static mixing plate 19 is detachably fixed to the sidewall of the fixing seat by bolts.
[0040] As a specific embodiment of the tubular reaction apparatus for polycarbonate polymerization provided by this utility model, please refer to Figure 1 as well as Figure 4 The static mixing plate 19 is provided with diversion holes 20.
[0041] For details, please refer to Figure 1 as well as Figure 4 The static mixing plate 19 is provided with multiple flow holes 20. The flow holes 20 are evenly distributed on the static mixing plate 19. The flow holes 20 can be circular, square, or regular hexagonal. The flow holes 20 on the static mixing plate 19 can imitate a honeycomb porous structure.
[0042] As a specific embodiment of the tubular reaction apparatus for polycarbonate polymerization provided by this utility model, please refer to Figure 1 as well as Figure 2 The prepolymer section cooling assembly 3 is equipped with a prepolymer section cooling pipe 4, which is a spiral pipe.
[0043] For details, please refer to Figure 1 as well as Figure 2 The polycondensation section cooling assembly 8 is internally equipped with a polycondensation section cooling pipe 9, which is a spiral pipe. The final polymerization section cooling assembly 13 is internally equipped with a final polymerization section cooling pipe 14, which is also a spiral pipe. The prepolymerization section cooling pipe 4, the polycondensation section cooling pipe 9, and the final polymerization section cooling pipe 14 are all spiral pipes with the same spiral direction, which helps to improve the cooling effect of the device. The prepolymerization section cooling assembly 3 is internally equipped with a prepolymerization section support pipe 5, which runs along the prepolymerization section. The cooling assembly 3 is arranged along its length. The prepolymerization section cooling assembly 3 is wrapped around the outer wall of the prepolymerization section support tube 5. The prepolymerization section support tube 5 supports the prepolymerization section cooling assembly 3, increasing the stability of the device. Correspondingly, the polycondensation section cooling assembly 8 is internally provided with a polycondensation section support tube 10, and the polycondensation section cooling assembly 8 is wrapped around the outer wall of the polycondensation section support tube 10. The final polymerization section cooling assembly 13 is internally provided with a final polymerization section support tube 15, and the final polymerization section cooling assembly 13 is wrapped around the outer wall of the final polymerization section support tube 15.
[0044] As a specific embodiment of the tubular reaction apparatus for polycarbonate polymerization provided by this utility model, please refer to Figure 1 as well as Figure 2 The prepolymer section cooling assembly 3 has the opposite spiral direction to the prepolymer section spiral tube 1.
[0045] For details, please refer to Figure 1 as well as Figure 2 The prepolymer section cooling assembly 3 has the opposite spiral direction to the prepolymer section spiral tube 1, the polycondensation section cooling assembly 8 has the opposite spiral direction to the polycondensation section spiral tube 6, and the final polymerization section cooling assembly 13 has the opposite spiral direction to the final polymerization section spiral tube 11, which helps to improve the cooling effect of the device.
[0046] As a specific embodiment of the tubular reaction apparatus for polycarbonate polymerization provided by this utility model, please refer to Figure 1 as well as Figure 2 A first sampling port 16 is provided on the pipeline between the prepolymerization section spiral fitting 1 and the polycondensation section spiral fitting 6, and a second sampling port 17 is provided on the pipeline between the polycondensation section spiral fitting 6 and the final polymerization section spiral fitting 11.
[0047] For details, please refer to Figure 1 as well as Figure 2The first sampling port 16 is set on the pipeline between the prepolymerization section spiral fitting 1 and the polycondensation section spiral fitting 6, the second sampling port 17 is set on the pipeline between the polycondensation section spiral fitting 6 and the final polymerization section spiral fitting 11, and the third sampling port 21 is also set on the pipeline at the outlet of the final polymerization section spiral fitting 11. The first sampling port 16, the second sampling port 17 and the third sampling port 21 are used to sample the reactants, and the reaction status can be monitored at any time, which facilitates the control of the device.
[0048] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A tubular reaction apparatus for polycarbonate polymerization, characterized in that, include: A prepolymerization section reaction assembly, comprising a prepolymerization section spiral tube and a prepolymerization section cooling assembly, wherein the prepolymerization section spiral tube is spirally wound around the outside of the prepolymerization section cooling assembly, and a prepolymerization section temperature sensor is provided inside the prepolymerization section spiral tube and the prepolymerization section temperature sensor is connected to a PLC control system. A polycondensation section reaction assembly, comprising a polycondensation section spiral tube and a polycondensation section cooling assembly, wherein the polycondensation section spiral tube is spirally wound around the outside of the polycondensation section cooling assembly, and a polycondensation section temperature sensor is disposed inside the polycondensation section spiral tube and connected to a PLC control system; and The final polymerization stage reaction assembly includes a final polymerization stage spiral tube and a final polymerization stage cooling assembly. The final polymerization stage spiral tube is spirally wound around the outside of the final polymerization stage cooling assembly. A final polymerization stage temperature sensor is installed inside the final polymerization stage spiral tube and is connected to a PLC control system. The prepolymerization section spiral pipe, the polycondensation section spiral pipe, and the final polymerization section spiral pipe are connected sequentially by a pipe, and the spiral directions of the three are consistent. The reactant enters through the left end of the prepolymerization section spiral pipe and exits through the right end of the final polymerization section spiral pipe.
2. The tubular reaction apparatus for polycarbonate polymerization as described in claim 1, characterized in that, The pitch of the prepolymer section spiral fitting is smaller than the pitch of the polycondensation section spiral fitting, and also smaller than the pitch of the final polymerization section spiral fitting.
3. The tubular reaction apparatus for polycarbonate polymerization as described in claim 1, characterized in that, The pitch of the polycondensation section spiral fitting is a gradually expanding pitch, and the pitch of the final polymerization section spiral fitting is a gradually expanding pitch.
4. The tubular reaction apparatus for polycarbonate polymerization as described in claim 1, characterized in that, Multiple sets of guide vanes are provided inside the prepolymer section spiral fitting, the polycondensation section spiral fitting, and the final polymerization section spiral fitting.
5. The tubular reaction apparatus for polycarbonate polymerization as described in claim 4, characterized in that, The guide vanes are staggered along both sides of the inner wall of the prepolymerization section spiral fitting, the polycondensation section spiral fitting, and the final polymerization section spiral fitting.
6. The tubular reaction apparatus for polycarbonate polymerization as described in claim 1, characterized in that, The polycondensation section spiral tube is equipped with multiple sets of static mixing plates, which are used to improve the mixing uniformity of the reactants.
7. The tubular reaction apparatus for polycarbonate polymerization as described in claim 6, characterized in that, The static mixing plate is provided with flow diversion holes.
8. The tubular reaction apparatus for polycarbonate polymerization as described in claim 1, characterized in that, The prepolymer section cooling assembly is equipped with prepolymer section cooling pipes, which are spiral pipes.
9. A tubular reaction apparatus for polycarbonate polymerization as described in claim 8, characterized in that, The spiral direction of the prepolymer section cooling pipe is opposite to that of the prepolymer section spiral pipe.
10. A tubular reaction apparatus for polycarbonate polymerization as described in claim 1, characterized in that, A first sampling port is provided on the pipe between the prepolymerization section spiral pipe fitting and the polycondensation section spiral pipe fitting, and a second sampling port is provided on the pipe between the polycondensation section spiral pipe fitting and the final polymerization section spiral pipe fitting.