An initiator feeding system for polytetrafluoroethylene propylene polymerization reactor

Abstract

This utility model discloses an initiator feeding system for poly(perfluoroethylene propylene) polymerization reactors, relating to the field of poly(perfluoroethylene propylene) polymerization reactions. It includes an initiator batching system, an initiator feeding system, and a polymerization reactor, connected in sequence. The initiator batching system includes an initiator storage tank connected to a low-pressure nitrogen delivery system and a first one-way breather valve, which discharges excess gas pressure from the storage tank. The initiator feeding system includes an initiator feed tank connected to the low-pressure nitrogen delivery system and a second one-way breather valve, which also discharges excess gas pressure from the feed tank. This utility model avoids introducing oxygen into the reactor by using a separate initiator storage tank for initiator preparation and a separate initiator feed tank for initiator delivery, both connected to a low-pressure nitrogen delivery system.

Description

Technical Field

[0001] This utility model relates to the field of poly(perfluoroethylene) propylene polymerization reaction, and specifically to an initiator feeding system for poly(perfluoroethylene) propylene polymerization reactor. Background Technology

[0002] FEP (Fluoropolymer) has good high and low temperature resistance, chemical stability, lubricity, and non-stick properties. In addition, it also has excellent electrical insulation and thermoplastic molding properties. These excellent properties make it widely used in the electronics and electrical industry, chemical industry, aerospace industry, medical and other fields.

[0003] Existing industrial polymerization methods for perfluoroethylene propylene (FEP) mainly include emulsion polymerization, suspension polymerization, and supercritical polymerization. This invention employs emulsion polymerization to prepare FEP polymers. Tetrafluoroethylene (TFE) and perfluoropropylene (HFP) gas-phase mixed monomers are co-polymerized in an aqueous medium containing a dispersant and initiator to produce FEP. The excellent properties of FEP polymers are partly due to their free radical polymerization mechanism. The ammonium persulfate and potassium persulfate composite initiator, upon entering the polymerization reactor, decompose upon heating to generate active free radicals that can control the polymerization rate. No significant initiator residue is found in the product, significantly improving product quality.

[0004] The precise, uniform, and air-free addition of the initiator to the polymerization reactor during the polymerization of perfluoroethylene propylene is one of the key steps in the entire process. Controlling the precise and uniform addition of the initiator ensures a stable polymerization reaction, while deoxygenating the initiator prevents excessive oxygen levels that could lead to explosive polymerization. Therefore, developing an automated deoxygenation injection system for initiators suitable for the polymerization of perfluoroethylene propylene is extremely important. Currently, there are two main industrial solutions for adding initiators to polymerization reactors: First, operators prepare a batch of initiator before each polymerization reaction and pump it into the reactor under atmospheric pressure and air contact using a metering pump. Second, an initiator solution is prepared in a pressure vessel, and inert gas is introduced into the vessel until the pressure exceeds 0.1 MPa. After the oxygen content is purged through evacuation, a metering pump is used to pump the initiator into the polymerization reactor. Method one requires frequent manual batching, is cumbersome, and may introduce oxygen from the air into the reactor, affecting the normal polymerization rate. Method two involves an initiator storage tank in a pressure vessel, resulting in high investment, inspection, and maintenance costs. Each batch requires evacuation, and the pressure changes within the sealed pressure vessel due to initiator output can create negative pressure, affecting the pump's normal delivery of additives. An additional pressure control loop is required, making the entire initiator feeding system complex and costly.

[0005] In view of the above, this application is hereby submitted. Utility Model Content

[0006] The purpose of this invention is to provide an initiator feeding system for polytetrafluoroethylene propylene polymerization reactors. The system uses a separate initiator storage tank for initiator preparation and an initiator feeding tank for initiator delivery, both of which are connected to a low-pressure nitrogen delivery system to solve the problem of oxygen content introduced into the reactor by the initiator.

[0007] This utility model embodiment is achieved through the following technical solution: This utility model embodiment provides an initiator feeding system for polytetrafluoroethylene propylene polymerization reactor reaction, including an initiator batching system, an initiator feeding system and a polymerization reactor arranged in sequence; The initiator dispensing system includes an initiator storage tank, which is connected to a low-pressure refined nitrogen delivery system and a first one-way breather valve. The first one-way breather valve is used to discharge excess gas pressure from the initiator storage tank. The initiator feeding system includes an initiator feed tank, which is connected to a low-pressure refined nitrogen delivery system and a second one-way breather valve. The second one-way breather valve is used to discharge excess gas pressure from the initiator feed tank.

[0008] Optionally, the initiator storage tank is also connected to a deionized water delivery system, and the initiator storage tank is also equipped with a feeding device for adding reagent bottles, and a stirring device is installed inside the initiator storage tank.

[0009] Optionally, a jacket is provided on the outer wall of the initiator storage tank, and the jacket and the outer wall of the initiator storage tank can form a sealed chamber, which is connected to a cooling water circulation pipeline.

[0010] Optionally, an initiator discharge pump and a first control valve are provided between the initiator batching system and the initiator feeding system; A second control valve is installed between the initiator storage tank and the deionized water delivery system; A third control valve is installed at the inlet side of the sealed chamber and the cooling water circulation pipeline, and a fourth control valve is installed at the outlet side of the chamber and the cooling water circulation pipeline.

[0011] Optionally, a fifth control valve is provided between the initiator storage tank and the low-pressure refined nitrogen delivery system, and a sixth control valve is provided between the initiator feed tank and the low-pressure refined nitrogen delivery system.

[0012] Optionally, the initiator feeding system includes an initial initiator conveying system and a replenishing initiator conveying system; Both the initial initiator delivery system and the supplementary initiator delivery system are connected to the initiator feed tank and the polymerization reactor, respectively.

[0013] Optionally, the initial initiator delivery system includes a piped initial initiator delivery pump, a seventh control valve, and a first precision filter.

[0014] Optionally, the supplemental initiator delivery system includes a pipeline-connected supplemental initiator delivery pump, an eighth control valve, and a second precision filter.

[0015] Optionally, the initial initiator delivery pump is a variable frequency three-pump head diaphragm metering pump.

[0016] Optionally, the initiator delivery pump is a variable frequency three-pump head diaphragm metering pump.

[0017] Compared with the prior art, the embodiments of this utility model have the following advantages and beneficial effects: 1. The initiator feeding system for polytetrafluoroethylene propylene polymerization reactors provided in this embodiment of the invention achieves precise and uniform initiator delivery and maintenance of a low-oxygen environment through the segmented design of the initiator storage tank and the feed tank, combined with a low-pressure nitrogen delivery system and a one-way breather valve. The low-pressure nitrogen delivery system ensures that the initiator remains in a low-oxygen environment during storage and delivery, avoiding the introduction of oxygen and thus reducing the risk of explosive polymerization during the polymerization process. The one-way breather valve effectively controls the pressure inside the tank, preventing instability caused by excessive pressure or the entry of outside air. This not only improves the stability and safety of the polymerization reaction but also reduces operating costs and maintenance difficulty, thereby increasing production efficiency.

[0018] 2. The entire system of this utility model embodiment ensures the safety and reliability of the initiator during storage, transportation, and use by setting multiple control valves (such as the first to eighth control valves) and a precision filter. The control valves can precisely control the initiator's flow rate, preventing uneven polymerization caused by excessive or insufficient flow. The precision filter can effectively remove tiny particles and impurities from the initiator solution, preventing impurities from adversely affecting the polymerization reaction. In addition, the introduction of a jacketed cooling system and a low-pressure nitrogen delivery system further ensures the stability of temperature and pressure within the initiator storage tank, avoiding the impact of temperature or pressure fluctuations on the quality of the initiator entering the reactor.

[0019] 3. This embodiment of the invention utilizes an existing variable frequency three-pump-head diaphragm metering pump, enabling the system to achieve high-precision and low-pulse control of the initiator delivery process. The variable frequency function allows the pump speed to be flexibly adjusted according to the actual needs of the polymerization reaction, thereby precisely controlling the initiator delivery rate. The three pump heads ensure the uniformity and stability of the flow rate, effectively reducing flow fluctuations and improving delivery accuracy. This high-precision delivery method ensures the smooth progress of the polymerization reaction, avoiding uneven polymerization caused by unstable initiator flow, thus significantly improving product quality.

[0020] 4. By dividing the initiator delivery system into an initial initiator delivery system and a supplementary initiator delivery system, the system can more precisely control the delivery of initiators at different stages of the polymerization reaction. The initial initiator delivery system ensures a smooth start to the polymerization reaction, while the supplementary initiator delivery system replenishes initiators as needed based on the progress and requirements of the polymerization reaction, maintaining its continuous progress. This staged delivery method not only improves the stability and uniformity of the polymerization reaction but also optimizes the efficiency of the polymerization process and product quality through precise control of the initiator dosage.

[0021] In general, the initiator feeding system for polytetrafluoroethylene propylene polymerization reactor provided by the embodiments of this utility model uses a separate initiator storage tank for initiator preparation and an initiator feeding tank for initiator delivery, and is connected to a low-pressure nitrogen delivery system to avoid the introduction of oxygen content into the reactor by the initiator. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the feeding system structure provided in an embodiment of the present utility model; Figure 2 A schematic diagram of the initiator dispensing system provided in an embodiment of this utility model; Figure 3 A schematic diagram of the initiator feeding system provided in an embodiment of this utility model.

[0024] The attached diagram shows the markings and corresponding component names: 1-Initiator storage tank; 2-First one-way breather valve; 3-Initiator feed tank; 4-Second one-way breather valve; 5-Reagent bottle; 6-Feeding component; 7-Agitator component; 8-Jacket; 9-First control valve; 10-Second control valve; 11-Third control valve; 12-Fourth control valve; 13-Fifth control valve; 14-Sixth control valve; 15-Polymerization reactor; 16-Initial initiator delivery pump; 17-Seventh control valve; 18-First precision filter; 19-Replenishment initiator delivery pump; 20-Eighth control valve; 21-Second precision filter; 22-Initiator discharge pump. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this utility model, it should be noted that the terms "first", "second", "third", etc. are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Example

[0029] Please refer to the reference. Figures 1-3 As shown, this embodiment of the present invention provides an initiator feeding system for a polytetrafluoroethylene propylene polymerization reactor 15, comprising an initiator batching system, an initiator feeding system, and a polymerization reactor 15 connected in sequence; the initiator batching system includes an initiator storage tank 1, which is connected to a low-pressure refined nitrogen conveying system and a first one-way breather valve 2, which is used to discharge excess gas pressure in the initiator storage tank 1; the initiator feeding system includes an initiator feed tank 3, which is connected to a low-pressure refined nitrogen conveying system and a second one-way breather valve 4, which is used to discharge excess gas pressure in the initiator feed tank 3.

[0030] Specifically, the initiator storage tank 1 is used to prepare the initiator solution, ensuring that the initiator is in a stable state before entering the polymerization reactor 15. The initiator storage tank 1 is connected to a low-pressure refined nitrogen delivery system and a first one-way breather valve 2. Low-pressure refined nitrogen enters the initiator storage tank 1 through the delivery system to displace the air inside the tank, ensuring a low-oxygen environment. The first one-way breather valve 2 allows excess pressure to be released from the tank, maintaining stable pressure while preventing outside air from entering. The initiator feed tank 3 is used to deliver the prepared initiator solution to the polymerization reactor 15. The initiator feed tank 3 is connected to a low-pressure refined nitrogen delivery system and a second one-way breather valve 4. Low-pressure refined nitrogen enters the initiator feed tank 3 through the delivery system, ensuring a low-oxygen environment. The second one-way breather valve 4 allows excess pressure to be released from the tank, maintaining stable pressure while preventing outside air from entering. The initiator feed tank 3 is connected to the polymerization reactor 15 via a pipeline, allowing the initiator solution to be accurately and uniformly delivered to the polymerization reactor 15 using an existing metering pump. The polymerization reactor 15 serves as the main site for the polymerization reaction, providing the environment and conditions required for the reaction. It receives the initiator solution from the initiator feed tank 3 and carries out the polymerization reaction with the gas-phase mixed monomers of tetrafluoroethylene (TFE) and perfluoropropylene (HFP) under the action of dispersants and initiators.

[0031] This embodiment of the initiator feeding system, through the segmented arrangement of initiator storage tank 1 and feed tank 3, combined with a low-pressure refined nitrogen conveying system and a one-way breather valve, achieves precise and uniform delivery of the initiator and maintenance of a low-oxygen environment. The low-pressure refined nitrogen conveying system ensures that the initiator remains in a low-oxygen environment throughout storage and delivery, preventing the introduction of oxygen and thus reducing the risk of explosive polymerization during the polymerization process. The one-way breather valve effectively controls the pressure inside the tank, preventing instability caused by excessive pressure or the entry of outside air. This not only improves the stability and safety of the polymerization reaction but also reduces operating costs and maintenance difficulty, thereby increasing production efficiency.

[0032] Exemplarily, the initiator storage tank 1 is also connected to a deionized water delivery system. The initiator storage tank 1 is also equipped with a feeding device 6 for adding reagent bottles 5, and a stirring device 7 is installed inside the initiator storage tank 1. In this embodiment of the invention, the deionized water delivery system provides deionized water to the initiator storage tank 1 for preparing the initiator solution. The deionized water is delivered to the initiator storage tank 1 through pipelines to ensure that the prepared initiator solution has a suitable concentration and purity. The feeding device 6 is used to add the initiator reagent bottle 5 to the initiator storage tank 1, facilitating safe and accurate addition of the initiator reagent bottle 5 by operators. The stirring device 7 mechanically dissolves the solid initiator in the deionized water, ensuring consistency of the initiator solution added for different batches of polymerization.

[0033] In a preferred embodiment of this invention, a jacket 8 is provided on the outer wall of the initiator storage tank 1. The jacket 8 and the outer wall of the initiator storage tank 1 form a sealed chamber, which is connected to a cooling water circulation pipe. The jacket 8 on the outer wall of the initiator storage tank 1 and the cooling water circulation pipe together constitute a highly efficient temperature regulation system. The sealed chamber formed by the jacket 8 and the outer wall of the tank ensures that the cooling water is in full contact with the tank, while the cooling water circulation pipe ensures the continuous flow of cooling water. This system can effectively absorb and remove the heat released by the dissolution of the solid initiator in the initiator storage tank 1, maintain the stability of the temperature inside the tank, and prevent the initiator from decomposing or deteriorating due to excessive temperature, thereby ensuring that the initiator has ideal activity and stability before entering the polymerization reactor 15.

[0034] More specifically, an initiator discharge pump 22 and a first control valve 9 are installed between the initiator batching system and the initiator delivery system; a second control valve 10 is installed between the initiator storage tank 1 and the deionized water delivery system; a third control valve 11 is installed at the inlet side of the sealed chamber and the cooling water circulation pipeline, and a fourth control valve 12 is installed at the outlet side of the cooling water circulation pipeline. By installing the initiator discharge pump 22 and the first control valve 9 between the initiator batching system and the initiator delivery system, the system can achieve precise and uniform delivery of the initiator to the initiator feed tank 3. At the same time, the second control valve 10 makes the deionized water addition process more precise, further improving the accuracy of the initiator solution preparation. In addition, the introduction of the third control valve 11 and the fourth control valve 12 makes the cooling water circulation more controllable, allowing the cooling effect to be adjusted according to actual needs, ensuring the temperature stability within the initiator storage tank 1.

[0035] Preferably, a fifth control valve 13 is installed between the initiator storage tank 1 and the low-pressure refined nitrogen delivery system, and a sixth control valve 14 is installed between the initiator feed tank 3 and the low-pressure refined nitrogen delivery system. By installing the fifth control valve 13 and the sixth control valve 14 between the initiator storage tank 1 and the feed tank and the low-pressure refined nitrogen delivery system respectively, the system can more accurately control the amount of low-pressure refined nitrogen entering. This not only ensures a low-oxygen environment in the initiator storage tank 1 and the feed tank, but also avoids instability caused by excessively high or low pressure by precisely controlling the pressure.

[0036] Furthermore, the initiator feeding system includes an initial initiator conveying system and a replenishing initiator conveying system; both the initial initiator conveying system and the replenishing initiator conveying system are respectively connected to the initiator feed tank 3 and the polymerization reactor 15. The initial initiator conveying system ensures that the polymerization reaction can start smoothly, while the replenishing initiator conveying system replenishes the initiator in a timely manner according to the progress and needs of the polymerization reaction, maintaining the continuous progress of the polymerization reaction. This embodiment of the invention enhances the flexibility and adaptability of the system through a staged conveying method, and can better cope with the needs of polymerization reactions of different scales and conditions.

[0037] Specifically, the initial initiator delivery system includes an initial initiator delivery pump 16, a seventh control valve 17, and a first precision filter 18 connected by pipelines. The initial initiator delivery pump 16 ensures that the initiator can be delivered to the polymerization reactor 15 efficiently and stably. The seventh control valve 17 is interlocked with the flow meter on the pipeline to ensure accurate quantitative delivery of the initiator and avoid uneven polymerization reaction caused by flow fluctuations. The first precision filter 18 further ensures the purity of the initiator solution, removing small particles and impurities to prevent impurities from adversely affecting the polymerization reaction. Similarly, the replenishment initiator delivery system includes a replenishment initiator delivery pump 19, an eighth control valve 20, and a second precision filter 21 connected by pipelines. By setting up the replenishment initiator delivery pump 19, the eighth control valve 20, and the second precision filter 21, precise control of the replenishment initiator delivery process and impurity filtration are achieved.

[0038] In a preferred embodiment of this invention, the initial initiator delivery pump 16 is a variable frequency three-pump-head diaphragm metering pump, and the initiator replenishment delivery pump 19 is also a variable frequency three-pump-head diaphragm metering pump. The variable frequency function allows the pump speed to be flexibly adjusted according to the actual needs of the polymerization reaction, thereby precisely controlling the delivery amount of initiator. The three pump heads ensure the uniformity and stability of the flow rate, effectively reducing flow fluctuations and improving the delivery accuracy.

[0039] To better achieve automated control of this utility model system, existing check valves, flow meters, and remote shut-off valves can also be used in conjunction. For example, in a specific process, the following operations can be performed: The initiator storage tank is equipped with 2.0 m³ of initiator solution. 3(Ammonium persulfate and potassium persulfate mass ratio 1~2:1, ammonium persulfate and potassium persulfate accounting for 5~10% of the initiator aqueous solution mass). After the oxygen content in the nitrogen gas in the storage tank is ≤40ppm, open the initiator discharge pump 22 to deliver 90~100L of initiator solution to the initiator feed tank 3. This operation is performed by setting the feed tank level interlock feed shut-off valve HV2 (first control valve 9). After the oxygen content in the nitrogen gas in the feed tank is ≤40ppm, add dispersant, modified monomer auxiliaries, and feed mixed gas phase monomers TFE and HFP to the polymerization reactor 15 until the pressure inside the reactor is 4.0~4.5M. Pa; Set the initial initiator flow rate FT2, open the initial initiator delivery pump 16 and the initiator initial feed remote valve HV3 (seventh control valve 17), the initiator enters the polymerization reactor 15 through the precision filter and reaches the set cumulative value, interlocking to close valve HV3 (seventh control valve 17) and stop the pump; Set the initiator replenishment flow rate FT3, open the replenishment initiator delivery pump 19 and the initiator replenishment feed remote valve HV4 (eighth control valve 20), the initiator enters the polymerization reactor 15 through the precision filter and reaches the set cumulative value, interlocking to close valve HV4 (eighth control valve 20) and stop the pump, the polymerization reaction ends.

[0040] The feed flow rate of the mixed gaseous monomers TFE and HFP in polymerization reactor 15 is 1000~1400 kg / h; the molar ratio of TFE to HFP is 90~95:5~10; Initial initiator feed flow rate FT2, set value 10L; supplementary initiator feed flow rate FT3, set value 18L; The polymerization reaction pressure is 4.0~4.5MPa, the reaction temperature is 110~115℃, and the reaction time is 60~70min; Under the above initiator feeding process, the polymerization reaction pressure is relatively stable and the temperature fluctuation range is small, which reflects that the polymerization reaction is relatively stable; the solid content of the polytetrafluoroethylene propylene emulsion produced by polymerization is 18%~22%, the emulsion has good stability and less demulsification.

[0041] It should be noted that in other embodiments, the first control valve to the eighth control valve can also be implemented using other existing valve structures, as long as the purpose of precise control can be achieved.

[0042] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model. It should be noted that the structures or components illustrated in the accompanying drawings are not necessarily drawn to scale, and descriptions of well-known components, processing techniques, and processes are omitted to avoid unnecessarily limiting the utility model.

Claims

1. An initiator feeding system for a polytetrafluoroethylene-propylene polymerization reactor, characterized in that, It includes an initiator batching system, an initiator feeding system and a polymerization reactor (15) connected in sequence. The initiator dispensing system includes an initiator storage tank (1), which is connected to a low-pressure refined nitrogen delivery system and a first one-way breathing valve (2). The first one-way breathing valve (2) is used to discharge excess gas pressure from the initiator storage tank (1). The initiator feeding system includes an initiator feed tank (3), which is connected to a low-pressure fine nitrogen delivery system and a second one-way breather valve (4). The second one-way breather valve (4) is used to discharge excess air pressure from the initiator feed tank (3).

2. The initiator feeding system for polytetrafluoroethylene propylene polymerization reactor according to claim 1, characterized in that, The initiator storage tank (1) is also connected to a deionized water delivery system. The initiator storage tank (1) is also equipped with a feeding device (6) for feeding the reagent bottle (5). The initiator storage tank (1) is equipped with a stirring device (7).

3. The initiator feeding system for polytetrafluoroethylene propylene polymerization reactor according to claim 2, characterized in that, The outer wall of the initiator storage tank (1) is provided with a jacket (8), and the jacket (8) and the outer wall of the initiator storage tank (1) can form a sealed chamber, and the sealed chamber is connected to a cooling water circulation pipeline.

4. The initiator feeding system for polytetrafluoroethylene propylene polymerization reactor according to claim 3, characterized in that, An initiator discharge pump (22) and a first control valve (9) are provided between the initiator batching system and the initiator feeding system. A second control valve (10) is provided between the initiator storage tank (1) and the deionized water delivery system. A third control valve (11) is provided at the inlet side of the sealed chamber and the cooling water circulation pipeline, and a fourth control valve (12) is provided at the outlet side of the sealed chamber and the cooling water circulation pipeline.

5. The initiator feeding system for polytetrafluoroethylene propylene polymerization reactor according to claim 4, characterized in that, A fifth control valve (13) is provided between the initiator storage tank (1) and the low-pressure refined nitrogen delivery system, and a sixth control valve (14) is provided between the initiator feed tank (3) and the low-pressure refined nitrogen delivery system.

6. The initiator feeding system for polytetrafluoroethylene propylene polymerization reactor according to claim 1, characterized in that, The initiator feeding system includes an initial initiator delivery system and a replenishing initiator delivery system; The initial initiator delivery system and the supplementary initiator delivery system are respectively connected to the initiator feed tank (3) and the polymerization reactor (15).

7. The initiator feeding system for polytetrafluoroethylene propylene polymerization reactor according to claim 6, characterized in that, The initial initiator delivery system includes an initial initiator delivery pump (16) connected by a pipeline, a seventh control valve (17) and a first precision filter (18).

8. The initiator feeding system for polytetrafluoroethylene propylene polymerization reactor according to claim 6, characterized in that, The replenished initiator delivery system includes a replenished initiator delivery pump (19) connected by a pipeline, an eighth control valve (20), and a second precision filter (21).

9. The initiator feeding system for polytetrafluoroethylene propylene polymerization reactor according to claim 7, characterized in that, The initial initiator delivery pump (16) is a variable frequency three-pump head diaphragm metering pump.

10. The initiator feeding system for polytetrafluoroethylene propylene polymerization reactor according to claim 8, characterized in that, The initiator delivery pump (19) is a variable frequency three-pump head diaphragm metering pump.

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