Polyperfluorinated ethylene propylene production system

Abstract

The utility model discloses a polyperfluorinated ethylene propylene production system which comprises a feeding device, an emulsion storage tank, a cleaning device, a reaction kettle, a filtering device and a waste water tank, the reaction kettle is provided with a feeding port, a cleaning port and a liquid discharge port, the feeding device is connected with the feeding port, the cleaning port is communicated with the cleaning device through a cleaning pipe, and the liquid discharge port is provided with a liquid discharge pipe; the filtering device comprises a filtering shell, a filtering net and a separating plate, a drawing hole is formed in the filtering shell, the separating plate is inserted into the drawing hole in a push-pull mode to divide the space in the filtering shell into a filtering area and a solid area, the filtering net is arranged in the filtering area, the filtering area is provided with a filtering inlet and a filtering outlet, and the solid area is provided with a solid discharging outlet; the emulsion storage tank is communicated with the liquid discharge pipe through an emulsion branch pipe; the liquid discharge pipe is communicated with a wastewater inlet of the wastewater tank through a wastewater branch pipe; the liquid discharging pipe is communicated with a filtering inlet of the filtering device through a recycling branch pipe; the emulsion branch pipe is provided with an emulsion valve, the cleaning pipe is provided with a cleaning valve, the recovery branch pipe is provided with a recovery valve, and the wastewater branch pipe is provided with a wastewater valve.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of polyfluoroethylene propylene production technology, especially to a polyfluoroethylene propylene production system. BACKGROUND

[0002] Polyfluoroethylene propylene (FEP) has good high and low temperature resistance, chemical stability, lubricity, anti-aging resistance, anti-sticking, in addition, it also has excellent electrical insulation and thermoplastic forming properties. The outstanding electrical insulation and thermoplastic easy processing forming characteristics make FEP copolymer can use extrusion, molding, spraying and other general thermoplastic processing technology to make diversified products, such as preparing excellent performance wire and cable insulation layer, circuit board and semiconductor insulation material, high temperature sealing material, etc., so that it is widely used in electronic and electrical industry, chemical industry, mechanical industry, aerospace industry, medical treatment, outdoor wear and other fields.

[0003] The existing industrialization polymerization methods of polyfluoroethylene propylene (FEP) mainly include emulsion polymerization, suspension polymerization and supercritical polymerization. In actual production, the intermittent polymerization process of emulsion polymerization and suspension polymerization is mainly used. The utility model uses emulsion polymerization process to prepare polyfluoroethylene propylene polymer, and the gaseous mixed monomers of tetrafluoroethylene (TFE) and perfluoro propylene (HFP) are copolymerized in the dispersant and initiator coexisting aqueous medium to produce FEP.

[0004] The tetrafluoroethylene (TFE) and perfluoro-propylene (HFP) gas phase mixed monomers are accompanied by stirring throughout the reaction process in the reaction kettle. The stirring can not only involve the monomers in the gas phase space into the liquid phase reaction system to participate in the reaction, but also effectively remove the heat generated during the polymerization process. However, as the molecular chain of the polyperfluoroethylene-propylene polymer increases due to the chain growth in the liquid phase system in the later stage of the reaction, the stirring has a certain degree of shearing effect on the liquid phase system, so that the FEP polymers collide with each other and then the polymer coalescence growth is precipitated from the micelles to cause demulsification, and the demulsification material is formed in the reaction kettle. The FEP polymer generated in each batch of reaction kettle after the current industrial emulsion polymerization reaction is ended contains a certain degree of demulsification material. After the reaction kettle discharges the emulsion to the emulsion storage tank, a small amount of residual emulsion and demulsification material generated during the polymerization process will exist in the bottom of the reaction kettle and the wall of the reaction kettle. At present, the following treatment schemes exist for the demulsification material and residual emulsion after the reaction kettle is discharged, one is that the operator directly discharges the above mixture together with the cleaning water during the cleaning of the reaction kettle, the demulsification material is collected and treated as solid waste, and the residual emulsion is diluted with a large amount of cleaning water and treated as fluorine-containing wastewater; or the above solid-liquid mixture is directly discharged together with the cleaning water into the emulsion storage tank without separation. The above method 1 cannot effectively recycle the demulsification material and residual emulsion, and generates a large amount of solid waste and fluorine-containing wastewater, which is not conducive to the ecological environment and reduces the economic benefit. In the method 2, the demulsification material and a large amount of cleaning wastewater enter the product emulsion storage tank, which affects the product quality, and the introduction of a large amount of water increases the product manufacturing cost.

[0005] Therefore, there is an urgent need for a polyperfluoroethylene-propylene production system to solve the above technical problems. Practical new type content

[0006] One purpose of the present application is to provide a polyperfluoroethylene-propylene production system to solve the problem of not recycling demulsification material in the prior art.

[0007] In order to achieve the above object, the utility model provides a kind of polyfluoroethylene propylene production system, comprising: feeding device, emulsion storage tank, cleaning device, reaction kettle, filtering device and wastewater tank, the reaction kettle is equipped with feed inlet, cleaning port and liquid discharge port, the feeding device is connected with the feed inlet, the cleaning port is communicated with the cleaning device by cleaning pipe, the liquid discharge port is equipped with liquid discharge pipe;The filtering device includes filter shell, filter screen and isolation plate, pull hole is equipped on the filter shell, the isolation plate is inserted into the pull hole and the space in the filter shell is separated into filtration zone above the isolation plate and solid zone below by push-pull, the filter screen is located in the filtration zone, the filtration zone is equipped with filter inlet and filter outlet, and the solid zone is equipped with solid discharge port;The emulsion storage tank is communicated with the liquid discharge pipe by emulsion branch pipe;The liquid discharge pipe is communicated with the wastewater inlet of the wastewater tank by waste liquid branch pipe;The liquid discharge pipe is communicated with the filter inlet of the filtering device by recovery branch pipe;The emulsion branch pipe is equipped with emulsion valve, the cleaning pipe is equipped with cleaning valve, the recovery branch pipe is equipped with recovery valve, and the wastewater branch pipe is equipped with wastewater valve.

[0008] Preferably, the polyfluoroethylene propylene production system further comprises a concentration device, which is arranged downstream of the filtering device, and is communicated with the filter outlet of the filtering device through a concentration branch pipe.

[0009] Preferably, the filter screen comprises a coarse filter screen and a fine filter screen, which are arranged in sequence from upstream close to the filter inlet to downstream close to the filter outlet along the filtration zone.

[0010] Preferably, the coarse filter screen is 20-35 mesh, and the fine filter screen is 40-80 mesh; and / or the filter screen is made of stainless steel mesh.

[0011] Preferably, the solid discharge port is connected with a drying device, a granulating device and a devolatilization device in sequence.

[0012] Preferably, the wastewater outlet of the wastewater tank is connected with a wastewater delivery pump for discharging wastewater from the wastewater tank.

[0013] Preferably, the liquid discharge pipe is provided with a liquid discharge valve, which is close to the liquid discharge port and located upstream of the emulsion branch pipe, the recovery branch pipe and the waste liquid branch pipe.

[0014] Preferably, the polyfluoroethylene propylene production system further comprises a first control module and a first flow meter, the first flow meter is arranged in the concentration branch pipe, and the first control module controls the switching of the recovery valve and the wastewater valve according to the flow obtained by the first flow meter.

[0015] As preferred, the polyfluoroethylene propylene production system further comprises a second control module and a second flow meter, the second flow meter is arranged on the cleaning pipe, and the second control module controls the opening and closing of the cleaning valve according to the flow obtained by the second flow meter.

[0016] As preferred, the polyfluoroethylene propylene production system further comprises a gas recovery device, the top of the reaction kettle is provided with a recovery port, the recovery device is communicated with the recovery port through a recovery pipe, and the recovery pipe is provided with a recovery valve.

[0017] As can be seen from the above, the technical scheme of the polyfluoroethylene propylene production system provided by the utility model realizes industrialized recycling of a small amount of un-discharged emulsion in each batch of kettles and demulsifying material generated in the polymerization process, has the characteristics of simple process, the whole process can be remotely controlled, and the demulsifying material and the emulsion product after recovery can effectively improve economic benefits.

[0018] The utility model adopts simple physical separation methods such as filtration, solid-liquid separation and flow shunting, realizes industrialized recycling of a small amount of un-discharged emulsion in each batch of kettles and demulsifying material generated in the polymerization process, has the characteristics of simple process, the whole process can be remotely controlled, and the demulsifying material and the emulsion product after recovery can effectively improve economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is the structural drawing of the polyfluoroethylene propylene production system embodiment of the utility model;

[0020] Fig. 2 It is the structural drawing of the filter device of the polyfluoroethylene propylene production system embodiment of the utility model;

[0021] Fig. 3 It is the structural drawing of the filter device of the polyfluoroethylene propylene production system embodiment of the utility model (isolation plate extraction state).

[0022] In the drawing:

[0023] 1, feeding device;11, feeding pipe;12, feeding valve;2, emulsion storage tank;21, emulsion branch pipe;22, emulsion valve;3, recovery device;31, recovery pipe;32, recovery valve;

[0024] 100, cleaning device; 110, second flow meter; 120, second control module;

[0025] 200, reaction kettle; 201, cleaning port; 2011, cleaning pipe; 2012, cleaning valve; 202, liquid discharge port; 2021, liquid discharge pipe; 2022, liquid discharge valve; 203, feed port; 204, recovery port;

[0026] 300, filtering device; 301, filtering inlet; 3011, filtering branch pipe; 3012, filtering valve; 302, filtering outlet; 3021, concentration branch pipe; 310, filter shell; 3101, pull hole; 311, filtering zone; 312, solid zone; 3121, solid discharge port; 320, filter screen; 321, coarse filter screen; 322, fine filter screen;

[0027] 400, wastewater tank; 401, wastewater inlet; 4011, waste liquid branch pipe; 4012, wastewater valve; 402, wastewater outlet; 410, first flow meter; 420, first control module;

[0028] 500, concentration device; 600, drying device; 700, granulation device; 800, devolatilization device; 900, wastewater delivery pump. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be further described below in conjunction with the drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, and not to limit the present application. In addition, it should be noted that only the parts related to the present application are shown in the drawings for the convenience of description, not all.

[0030] In the present application, some orientation words are limited, and unless the opposite is stated, the orientation words such as "up", "down", "left", "right", "in", "out" are used for the convenience of understanding, and thus do not constitute a limitation on the protection scope of the present application.

[0031] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "above", "upper" and "upper surface" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0032] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through the indirect connection of intermediate medium, can be two element internal communication or two element mutual action relation. For ordinary skilled person in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to specific circumstances.

[0033] As Figs. 1 to 3 The utility model discloses a kind of polyfluoroethylene propylene production systems, as shown in a preferred embodiment of the utility model. Polyfluoroethylene propylene production system includes: feeding device 1, emulsion tank 2, cleaning device 100, reaction kettle 200, filter device 300 and wastewater tank 400.

[0034] Reaction kettle 200 is provided with cleaning port 201, liquid discharge port 202 and feed port 203, cleaning port 201 is communicated with cleaning device 100 by cleaning pipe 2011, and liquid discharge port 202 is provided with liquid discharge pipe 2021. Liquid discharge port 202 is arranged at the bottom position close to the kettle body of reaction kettle 200. Preferably, as shown in the figure, feed port 203 is arranged at the top of reaction kettle 200, which is convenient for feeding.

[0035] Feeding device 1 is connected with feed port 203. In the prior art, feeding device 1 can mix raw materials and additives and then enter reaction kettle 200. Feeding device 1 can also include raw material feeding sub-device and additive feeding sub-device, and feed port 203 includes raw material sub-inlet and additive sub-inlet, and raw materials and additives enter reaction kettle 200 respectively, which will not be described here. Preferably, feeding device 1 is connected with feed port 203 through feeding pipe 11, and feeding valve 12 is arranged on feeding pipe 11. After feeding is completed, feeding valve 12 closes feed port 203.

[0036] Filter device 300 includes filter shell 310, filter screen 320 and isolation plate 330, pull hole 3101 is arranged on filter shell 310, isolation plate 330 is inserted into pull hole 3101 in a push-pull manner, and the space in filter shell 310 is divided into filter area 311 above isolation plate 330 and solid area 312 below isolation plate 330, filter screen 320 is arranged in filter area 311, filter area 311 is provided with filter inlet 301 and filter outlet 302, and solid area 312 is provided with solid discharge port 3121. In use, isolation plate 330 is installed in pull hole 3101, the liquid to be filtered enters filter area 311 from filter inlet 301, the liquid to be filtered is filtered by filter screen 320, the solid falls on isolation plate 330, and the remaining liquid flows out from filter outlet 302. After filtration is completed, isolation plate 330 is pulled out to put the filtered solid into solid area 312.

[0037] The emulsion tank 2 is communicated with the liquid discharge pipe 2021 through the emulsion branch pipe 21, and the polyfluoroethylene propylene emulsion generated by the reaction kettle 200 is discharged into the emulsion tank 2 through the liquid discharge pipe 2021 and the emulsion branch pipe 21 for storage. The emulsion branch pipe 21 is provided with an emulsion valve 22, and when the emulsion discharging in the kettle is completed and the emulsion valve 22 is closed, the cleaning of the reaction kettle 200 is carried out. The emulsion tank 2 can be an emulsion pool, an emulsion tank, etc.

[0038] As shown in Fig. 1 , the liquid discharge pipe 2021 is communicated with the waste water inlet 401 of the waste water tank 400 through the waste liquid branch pipe 4011; the liquid discharge pipe 2021 is communicated with the filter inlet 301 of the filtering device 300 through the recovery branch pipe 3011; the cleaning pipe 2011 is provided with a cleaning valve 2012, the recovery branch pipe 3011 is provided with a recovery valve 3012, and the waste liquid branch pipe 4011 is provided with a waste water valve 4012.

[0039] In a preferred embodiment, as shown in Fig. 1 , the liquid discharge pipe 2021 is provided with a liquid discharge valve 2022, the liquid discharge valve 2022 is close to the liquid discharge port 202, and the liquid discharge valve 2022 is located upstream of the emulsion branch pipe 21, the recovery branch pipe 3011 and the waste liquid branch pipe 4011, that is, the liquid discharge valve 2022 is the total valve of the liquid discharge pipe 2021. When cleaning the reaction kettle 200, open the liquid discharge valve 2022, and the kettle cleaning emulsion is discharged from the liquid discharge pipe 2021. When the reaction kettle 200 is used to generate emulsion, close the liquid discharge valve 2022. By providing the liquid discharge valve 2022 on the liquid discharge pipe 2021, on the one hand, the valve is closed during the polymerization reaction stage to keep the reaction kettle isolated and closed reaction system, and the mixed monomers complete the polymerization reaction in the kettle body; on the other hand, after the reaction is completed, the valve can be opened and closed to communicate or isolate the reaction kettle with the downstream equipment, which is convenient for controlling the whole production and recovery process.

[0040] In use, the emulsion valve 22, the recovery valve 3012, the cleaning valve 2012, the waste water valve 4012 are all closed, and when the liquid discharge pipe 2021 is provided with the liquid discharge valve 2022, the liquid discharge valve 2022 is also closed. The feed device 1 introduces the mixed gaseous monomer raw material of TFE and HFP and the auxiliary agent (dispersing agent, initiator, etc.) into the reaction kettle 200 through the feed pipe 11 from the feed port, and copolymerizes in the aqueous medium to produce FEP polymer. After the polyfluoroethylene propylene reaction of the reaction kettle 200 is completed, the gaseous mixed monomers still existing in the reaction kettle 200 are recovered, evacuated and replaced, and emptied. After the reaction kettle 200 is at normal pressure, the emulsion valve 22 is opened, the reaction kettle enters the discharging stage, and the emulsion tank 2 stores the liquid phase volume of 4.8m 3The FEP emulsion is discharged into the emulsion storage tank, and the emulsion valve 22 is closed after the discharge is completed. When the drain pipe 2021 is equipped with a drain valve 2022, the drain valve 2022 is opened simultaneously. The drain valve 2022 remains open during the discharge and cleaning stages.

[0041] After the discharge stage, the reactor 200 enters the cleaning stage, which is divided into a first stage and a second stage. In the first stage, the cleaning valve 2012 and the recovery valve 3012 are opened, and the wastewater valve 4012 is closed. The cleaning device 100 supplies high-pressure hot deionized water at 95°C to the reactor 200. The high-pressure hot deionized water mixes with the small amount of residual emulsion and polytetrafluoroethylene propylene demulsifier solids in the reactor 200 to form a cleaned emulsion. The cleaned emulsion enters the filtration zone 311 from the filter inlet 301 of the filter shell 310 through the drain pipe 2021 and the recovery branch pipe 3011. The filter screen 320 filters and intercepts the polytetrafluoroethylene propylene demulsifier solids contained in the cleaned emulsion, which fall onto the isolation plate 330. The filtered cleaned emulsion is discharged from the filter outlet 302. After multiple batches of cleaned emulsion are filtered and separated by the filter screen 320, the liquid phase is as follows: Fig. 3 As shown, the isolation plate 330 is removed, and the filtered and separated poly(perfluoroethylene propylene) demulsified solids are placed into the solid zone 312. In the second stage, the cleaning valve 2012 is kept open, the recovery valve 3012 is closed, and the wastewater valve 4012 is opened. The cleaning wastewater flows sequentially through the drain pipe 2021 and the wastewater branch pipe 4011 into the wastewater tank 400 until cleaning is complete, at which point the cleaning valve 2012 is closed. The poly(perfluoroethylene propylene) demulsified solids in the solid zone 312 are periodically discharged and collected through the solid discharge port 3121. Using this invention, the demulsified solids from cleaning the reactor 200 can be collected, overcoming the limitation of existing technologies that cannot recover poly(perfluoroethylene propylene) demulsified solids.

[0042] In a preferred embodiment, the polytetrafluoroethylene propylene production system further includes a concentration device 500, which is located downstream of the filtration device 300. The concentration device 500 is connected to the filtration outlet 302 of the filtration device 300 via a concentration branch pipe 3021, and is used to collect the filtered clear emulsion discharged from the filtration outlet 302.

[0043] In the first stage described above, the emulsion discharged from the filter outlet 302 enters the concentration unit 500 through the concentration branch pipe 3021 for concentration, resulting in a concentrated dispersion of polytetrafluoroethylene propylene with a recovered solid content of 30-50 wt%. The concentrated dispersion is allowed to stand for 6 months without any demulsification or stratification. Preferably, the concentration unit 500 is a vacuum concentration unit.

[0044] In a preferred embodiment, the filter screen 320 comprises a coarse filter screen 321 and a fine filter screen 322, the coarse filter screen 321 and the fine filter screen 322 are arranged in sequence along the filtration zone 311 from upstream close to the filtration inlet 301 to downstream close to the filtration outlet 302. Preferably, the coarse filter screen 321 is 20-35 mesh, and the fine filter screen 322 is 40-80 mesh. The material of the filter screen 320 is selected from stainless steel, preferably S31603 stainless steel, that is, the coarse filter screen 321 and the fine filter screen 322 are both made of stainless steel. This avoids contamination of the recovered material during the recovery process, so that the recovered product has good physical and chemical properties. The filter screen 320 comprises multiple layers of coarse filter screens 321 and fine filter screens 322 with different pore sizes, which can better separate solid demulsified materials and prevent the filter screen 320 from being clogged and improve the filtration efficiency. In particular, the coarse filter screen 321 and the fine filter screen 322 can each be provided with multiple layers.

[0045] Further, the solid discharge port 3121 is connected in sequence with a drying device 600, a granulation device 700, and a devolatilization device 800. After the polyfluoroethylene propylene demulsified solid in the solid zone 312 is periodically discharged through the solid discharge port 3121, the polyfluoroethylene propylene resin product is obtained through the drying device 600, the granulation device 700, and the devolatilization device 800.

[0046] Further, the wastewater outlet 402 of the wastewater tank 400 is connected with a wastewater conveying pump 900 for discharging the filtered wastewater from the wastewater tank 400. The wastewater is discharged to a wastewater treatment system for treatment, recycling, or external discharge after treatment.

[0047] In a preferred embodiment, the polyfluoroethylene propylene production system further comprises a first control module 420 and a first flow meter 410, the first flow meter 410 is arranged at the concentrated branch pipe 3021, and the first control module 420 controls the switching of the recovery valve 3012 and the wastewater valve 4012 according to the flow obtained by the first flow meter 410. The first control module 420 sets a first flow threshold value, when the flow threshold value detected by the first flow meter 410 reaches the first flow threshold value, the first control module 420 closes the recovery valve 3012 and opens the wastewater valve 4012, for example, the first flow threshold value is set to 1.1 m 3 , 1.2 m 3 , 1.3 m 3 . The switching of the recovery valve 3012 and the wastewater valve 4012 is controlled by the first control module 420 and the first flow meter 410. Remote control and automatic control are realized.

[0048] In a preferred embodiment, the polyfluoroethylene propylene production system further comprises a second control module 120 and a second flow meter 110, the second flow meter 110 is arranged in the cleaning pipe 2011, and the second control module 120 controls the opening and closing of the cleaning valve 2012 according to the flow obtained by the second flow meter 110. The second control module 120 is provided with a second flow threshold value, and the second flow meter 110 is used to detect the flow of the cleaning water provided by the cleaning device 100, and when the flow of the second flow meter 110 reaches the second flow threshold value, the second control module 120 controls the cleaning valve 2012 to be closed. The automatic control of the cleaning water is realized by the second control module 120 and the second flow meter 110. Remote control and automatic control are realized.

[0049] In a preferred embodiment, the polyfluoroethylene propylene production system further comprises a recovery device 3, the top of the reaction kettle 200 is provided with a recovery port 204, the recovery device 3 is communicated with the recovery port 204 through a recovery pipe 31, and the recovery pipe 31 is provided with a recovery valve 32. In the reaction production stage of the reaction kettle 200, the recovery valve 32 is closed, after the production of the reaction kettle 200 is completed, the recovery valve 32 is opened, and the recovery device 3 is started to recover the gas-phase mixed monomers still existing in the reaction kettle 200, so that the unreacted raw material monomers are recovered, and after being separated and purified, the unreacted raw material monomers are used for subsequent reaction production, thereby effectively reducing the production cost.

[0050] The yield and performance of the recovered product obtained by using the polyfluoroethylene propylene production system: the cleaning emulsion discharged from the discharge port 202 of the reaction kettle 200 is separated into polyfluoroethylene propylene demulsified solids and cleaning emulsion by the filtering device 300. After 100 batches of the above-mentioned polyfluoroethylene propylene demulsified solids and cleaning emulsion after polymerization are recovered, a concentrated dispersion liquid of polyfluoroethylene propylene with a solid content of 30-50wt% (weight percentage) after recovery is obtained, the volume of the concentrated dispersion liquid is 1.5m 3 , the cleaning emulsion is stored for 6 months without demulsified solids being precipitated or stratification phenomenon; about 600-700Kg of polyfluoroethylene propylene resin after recovery is obtained, the resin has excellent performance of a melting temperature range of 250-260℃, a tensile strength of 20-30MPa, and an elongation rate of 250-350%; the product after recovery has great economic benefits.

[0051] Although the utility model has been described in detail above by general description, specific embodiments and tests, some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the utility model all belong to the scope of protection required by the utility model.

Claims

1. A polyfluoroethylene propylene production system, characterized by, The system comprises a feeding device, an emulsion tank, a cleaning device, a reaction kettle, a filtering device and a wastewater tank, the reaction kettle is provided with a feeding port, a cleaning port and a liquid discharge port, the feeding device is connected with the feeding port, the cleaning port is communicated with the cleaning device through a cleaning pipe, the liquid discharge port is provided with a liquid discharge pipe, the filtering device comprises a filter shell, a filter screen and a partition plate, the filter shell is provided with a pull-out hole, the partition plate is inserted into the pull-out hole to divide the space in the filter shell into a filtering area above the partition plate and a solid area below the partition plate, the filter screen is arranged in the filtering area, the filtering area is provided with a filtering inlet and a filtering outlet, and the solid area is provided with a solid discharge port, the emulsion tank is communicated with the liquid discharge pipe through an emulsion branch pipe, the liquid discharge pipe is communicated with a wastewater inlet of the wastewater tank through a wastewater branch pipe, the liquid discharge pipe is communicated with the filtering inlet of the filtering device through a recovery branch pipe, the emulsion branch pipe is provided with an emulsion valve, the cleaning pipe is provided with a cleaning valve, the recovery branch pipe is provided with a recovery valve, and the wastewater branch pipe is provided with a wastewater valve. The polyfluoroethylene propylene production system further comprises a concentration device, which is communicated with the filtering outlet of the filtering device through a concentration branch pipe.

2. The polyfluoroethylene propylene production system of claim 1, wherein, The filter screen comprises a coarse filter screen and a fine filter screen, and the coarse filter screen and the fine filter screen are arranged in sequence from the upstream close to the filtering inlet to the downstream close to the filtering outlet of the filtering area.

3. The polyfluoroethylene propylene production system of claim 1, wherein, The coarse filter screen is 20-35 mesh, and the fine filter screen is 40-80 mesh; and / or 4. The polyfluoroethylene propylene production system of claim 3, wherein, The filter screen is made of stainless steel screen. The solid discharge port is sequentially connected with a drying device, a granulating device and a devolatilization device.

5. The polyfluoroethylene propylene production system of claim 1, wherein, The wastewater outlet of the wastewater tank is connected with a wastewater conveying pump for discharging the wastewater in the wastewater tank.

6. The polyfluoroethylene propylene production system of claim 1, wherein, The liquid discharge pipe is provided with a liquid discharge valve, the liquid discharge valve is close to the liquid discharge port, and the liquid discharge valve is located upstream of the emulsion branch pipe, the recovery branch pipe and the wastewater branch pipe.

7. The polyfluoroethylene propylene production system of claim 1, wherein, The polyfluoroethylene propylene production system further comprises a first control module and a first flow meter, the first flow meter is arranged in the concentration branch pipe, and the first control module controls the switching of the recovery valve and the wastewater valve according to the flow obtained by the first flow meter.

8. The polyfluoroethylene propylene production system of claim 2, wherein, The polyfluoroethylene propylene production system further comprises a second control module and a second flow meter, the second flow meter is arranged in the cleaning pipe, and the second control module controls the opening and closing of the cleaning valve according to the flow obtained by the second flow meter.

9. The polyfluoroethylene propylene production system of claim 8, wherein, The polyfluoroethylene propylene production system further comprises a gas recovery device, the top of the reaction kettle is provided with a recovery port, the recovery device is communicated with the recovery port through a recovery pipe, and the recovery pipe is provided with a recovery valve.

10. The polyfluoroethylene propylene production system of claim 1, wherein, ​

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