Perfluoropolyether continuous polymerization equipment

Abstract

The invention relates to the field of fluorine-containing chemical synthesis, and discloses perfluoropolyether continuous polymerization equipment, which comprises a kettle body and a plurality of light-emitting cold traps arranged in the kettle body, a microporous plate used for placing raw materials and allowing oxygen to pass through is fixedly mounted in the kettle body, and the interior of the kettle body is divided into a reaction area and a recovery area positioned at the lower part by the microporous plate; the kettle body is provided with a generating assembly and a cooling assembly sleeved outside all the light-emitting cold traps, and the cooling assembly acts on the reaction area. According to the invention, the recovery area is arranged below the reaction area without heat preservation, and after products in the reaction area enter the recovery area through the generation assembly, raw materials and small molecules after natural temperature rise can be gasified and then enter the reaction area, so that the purpose of producing while recovering is achieved, the independent recovery time is saved, the waste of the raw materials can be effectively avoided, and the production cost is reduced. And personnel poisoning accidents caused by subsequent small molecule leakage are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fluorine-containing chemical synthesis, in particular to a device for continuous polymerization of perfluoropolyether. Background Art

[0002] Perfluoropolyether is a synthetic polymer that is liquid at room temperature and is often used as a lubricant for mechanical components. The synthesis of perfluoropolyether in industry is generally done by adding low-temperature liquid hexafluoropropylene to a stainless steel reactor equipped with multiple ultraviolet lamps, then introducing oxygen in a certain proportion, and irradiating it with ultraviolet lamps in a low-temperature environment to stimulate photooxidation.

[0003] For example, Chinese patent publication number CN118546351A discloses a method for preparing perfluoropolyether acyl fluoride by continuous cross-flow photooxidation reaction, which includes sequentially passing hexafluoropropylene at -50 to -40°C through a series of photooxidation reactors and entering oxygen and trifluorochloroethylene gas from the bottom of each photooxidation reactor for photooxidation reaction under ultraviolet light excitation; the reaction liquid overflowing from the upper side of the last photooxidation reactor directly enters the room temperature hexafluoropropylene evaporation recovery kettle, and the vaporized hexafluoropropylene is condensed and circulated to the hexafluoropropylene raw material storage tank for recycling; the number of the photooxidation reactors is ≥2. It has the advantages of high light excitation efficiency, stable oxidation reaction, and fully controllable and adjustable molecular weight distribution of perfluoropolyether acyl fluoride.

[0004] The raw materials of this application are only concentrated at the bottom of the reactor, and there will be unreacted raw materials and small molecules in the liquid after the reaction, which will cause waste of raw materials. In addition, the small molecules are easy to leak and may cause production accidents of poisoning of personnel, so there are certain limitations in use.

[0005] Therefore, it is necessary to provide a device for continuous polymerization of perfluoropolyether to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a device for continuous polymerization of perfluoropolyether to solve the problems raised in the above background technology.

[0007] In order to achieve the above objectives, a device for continuous polymerization of perfluoropolyether is designed which can realize effective utilization of raw materials and reduce leakage of small molecules.

[0008] Based on the above ideas, the present invention provides the following technical solutions: a device for continuous polymerization of perfluoropolyether, a kettle body and a plurality of luminescent cold traps arranged in the kettle body, wherein a microporous plate for placing raw materials and allowing oxygen to pass through is fixedly installed in the kettle body, and the kettle body is divided into a reaction zone and a recovery zone located below by the microporous plate, and a generating component and a cooling component mounted outside all the luminescent cold traps are arranged on the kettle body, and the cooling component acts on the reaction zone.

[0009] As a further solution of the present invention: the generating assembly includes a hexafluoropropylene inlet, an oxygen inlet, a liquid phase transport pipe, an exhaust port and a discharge port connected to the kettle body, the hexafluoropropylene inlet and the exhaust port are both located at the top of the kettle body, the oxygen inlet and the discharge port are both located below the microporous plate, and the liquid phase transport pipe is respectively connected to the reaction zone and the recovery zone.

[0010] As a further solution of the present invention: the liquid phase transport pipe is designed to be U-shaped, and a control valve is arranged on the pipe wall.

[0011] As a further solution of the present invention: the cooling component includes a cover shell fixedly installed in the kettle body and sleeved outside all the luminescent cold traps, the outer surface of the kettle body is fixedly installed with a refrigerant inlet and a refrigerant outlet connected to the cover shell, and a distance is set between the cover shell and the outer surface of the luminescent cold trap.

[0012] As a further solution of the present invention: the cooling component also includes a heat-insulating layer fixedly installed on the outer surface of the kettle body, and the refrigerant inlet and the refrigerant outlet are designed to penetrate the heat-insulating layer.

[0013] As a further solution of the present invention: the top surface of the cover shell is fixedly connected to the inner top wall of the kettle body, and the hexafluoropropylene inlet and the exhaust port both correspond to the spacing up and down.

[0014] As a further solution of the present invention: the microporous plate includes a circular plate fixedly connected to the kettle body and a sliding cylinder that slides up and down with the circular plate, and the number and position of the sliding cylinder correspond to the luminescent cold traps; when the sliding cylinder slides up based on the circular plate, the inner wall of the sliding cylinder can contact the outer surface of the luminescent cold trap, and its outer surface can contact the inner wall of the corresponding luminescent cold trap of the cover shell.

[0015] As a further solution of the present invention: the surface of the kettle body is provided with an adjusting assembly fixedly connected to all the slide cylinders; starting the adjusting assembly can drive the slide cylinder to move based on the circular plate.

[0016] As a further solution of the present invention: the adjusting assembly includes a base fixedly installed outside the kettle body, a motor fixedly installed on the bottom surface of the base, a long rod fixedly installed on the output shaft of the motor, a bracket is threadedly sleeved on the outer surface of the long rod, a partition is fixedly installed on the end of the bracket away from the long rod, and a connecting rod fixedly connected to the slide cylinder is fixedly installed on the bottom of the partition.

[0017] As a further solution of the present invention: the number of the connecting rods corresponds to the slide cylinders and they are fixedly connected one by one, and the connecting rods penetrate the top surface of the kettle body and pass through the gap between the cover shell and the luminescent cold trap.

[0018] Compared with the prior art, the beneficial effects of the present invention are: the use of a microporous plate can allow oxygen and liquid hexafluoropropylene to be mixed evenly, allowing the reaction to proceed smoothly, and no stirring structure is required for mixing, which can ensure the service life of the luminescent cold trap, effectively simplify the internal structure of the kettle, reduce production costs and improve the overall stability of the equipment.

[0019] The use of shell surround cooling, different from traditional jacket cooling, can effectively reduce the temperature difference in the reaction zone, improve the temperature control effect, and make the molecular weight of the produced product more concentrated.

[0020] By setting the recovery zone below the reaction zone without insulation, when the product of the reaction zone enters the recovery zone through the generating assembly, the raw materials and small molecules that are naturally heated can be gasified and then enter the reaction zone, thereby achieving the purpose of recycling and production at the same time, saving the time of separate recycling, effectively avoiding the waste of raw materials, and reducing the subsequent small molecule leakage. Poisoning accidents caused by personnel, the overall practicality is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0022] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the internal structure of the kettle body of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the cover shell and the light-emitting cold trap of the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the kettle body and the regulating assembly of the present invention;

[0026] Figure 5 It is a schematic diagram of the circular plate and the slide cylinder structure of the present invention;

[0027] Figure 6 for Figure 5 A magnified view of the structure at center;

[0028] Figure 7 for Figure 5 A magnified view of the structure at B in the middle;

[0029] Figure 8 It is a schematic diagram of the structure of the long rod and the rotating assembly of the present invention;

[0030] Fig. 9 It is a schematic diagram of the ring and connecting rod structure of the present invention;

[0031] Fig.10 It is a schematic diagram of the slide cylinder and the insert structure of the present invention.

[0032] In the figure: 1, kettle body; 2, luminous cold trap; 3, microporous plate; 4, cooling component; 5, generating component; 6, regulating component; 7, rotating component; 101, reaction zone; 102, recovery zone; 301, circular plate; 302, slide cylinder; 303, insert; 401, refrigerant inlet; 402, cover; 403, refrigerant outlet; 501, hexafluoropropylene inlet; 502, oxygen inlet; 503, liquid phase transfer pipe; 504, exhaust port; 505, discharge port; 601, base; 602, motor; 603, long rod; 604, bracket; 605, partition; 606, connecting rod; 701, ring; 702, pulley. DETAILED DESCRIPTION

[0033] Embodiment 1:

[0034] See also Figures 1 to 3 The embodiment of the present invention provides a device for continuous polymerization of perfluoropolyether, which is mainly used to achieve effective utilization of raw materials. The device includes a kettle body 1, on which a plurality of luminescent cold traps 2 are fixedly installed. The luminescent cold traps 2 can provide ultraviolet light to polymerize oxygen and liquid hexafluoropropylene. Specifically, an ultraviolet lamp (not shown in the figure) can be placed in the cold trap. In this embodiment, the number of luminescent cold traps 2 is five, and they are arranged equidistantly.

[0035] Furthermore, a microporous plate 3 for placing hexafluoropropylene and allowing oxygen to pass through is fixedly installed in the kettle body 1. Hexafluoropropylene will not flow down from the microporous plate 3. The kettle body 1 is divided into two upper and lower sections by the microporous plate 3. The upper section corresponds to the reaction zone 101 corresponding to the luminescent cold trap 2, and the lower section can be used for discharging and corresponds to the recovery zone 102. A generating component 5 is also provided in the kettle body 1. The generating component 5 can realize the raw material supply of hexafluoropropylene and oxygen, the corresponding discharge of tail gas, and the corresponding discharging of materials. Among them, a cooling component 4 is provided in the kettle body 1 and is sleeved outside all the luminescent cold traps 2. The cooling component 4 is used to control the corresponding temperature of the reaction zone 101, which can effectively reduce the reaction temperature difference.

[0036] In this embodiment, the use of microporous plate 3 for air intake can also allow oxygen and liquid hexafluoropropylene to be mixed evenly, allowing the reaction to proceed smoothly. At the same time, unlike the stirring and mixing of a traditional reactor, the luminescent cold trap 2 will not be affected by the stress generated by the stirring vortex, thereby avoiding the breakage of the welding joint of the luminescent cold trap 2 and extending the service life of the luminescent cold trap 2.

[0037] Reference Figure 1 and Figure 2In this embodiment, preferably: the generating assembly 5 includes a hexafluoropropylene inlet 501, an oxygen inlet 502, a liquid phase transport pipe 503, an exhaust port 504 and a discharge port 505 connected to the kettle body 1, wherein the hexafluoropropylene inlet 501 and the exhaust port 504 are both located at the top of the kettle body 1, and are respectively used to introduce liquid hexafluoropropylene and discharge the tail gas generated during polymerization; the oxygen inlet 502 and the discharge port 505 are both located in the recovery zone 102, that is, located below the microporous plate 3, and the discharge port 505 is located directly below the recovery zone 102.

[0038] In the above structure, the liquid phase transport pipe 503 is designed in a U shape and is connected to the reaction zone 101 and the recovery zone 102 respectively. At the same time, a control valve can be installed on the liquid phase transport pipe 503. The liquid phase transport pipe 503 is used to transport the raw materials from the reaction zone 101 to the recovery zone 102, and the control valve corresponds to the start and stop of the raw material transportation. Among them, the control valve is an existing mature technology and will not be described in detail here.

[0039] Reference Figure 1 and Figure 2 In this embodiment, preferably: the cooling component 4 includes a cover 402 fixedly installed in the kettle body 1 and sleeved outside all the luminescent cold traps 2, and the outer surface of the kettle body 1 is fixedly installed with a refrigerant inlet 401 and a refrigerant outlet 403 connected to the cover 402. The hollow design of the cover 402 can realize the corresponding movement of the refrigerant, and form an effective surrounding cooling for the luminescent cold trap 2, which can effectively reduce the reaction temperature, ensure the temperature control effect, and make the molecular weight of the produced product more concentrated; of course, there is a distance between the cover 402 and the luminescent cold trap 2, and the distance is used for the movement of liquid hexafluoropropylene and the subsequent circulation of tail gas.

[0040] Furthermore, the cooling component 4 may also include an insulation layer (not numbered in the figure) fixedly mounted on the outer surface of the kettle body 1, which can further ensure the temperature stability in the kettle body 1, and the refrigerant inlet 401 and the refrigerant outlet 403 penetrate the insulation layer. Among them, the cover 402 is located in the reaction zone 101 to control the temperature of the reaction zone 101, while the recovery zone 102 is not provided with insulation.

[0041] Reference Figure 3 In this embodiment, preferably, the top surface of the cover shell 402 can be fixedly connected to the inner top wall of the kettle body 1, and the top surface of the cover shell 402 is no longer as Figure 2 As shown in the figure, the spacing is formed, and at this time, the spacing between the hexafluoropropylene inlet 501 and the exhaust port 504 in the vertical direction can correspond to each other, so as not to affect the transportation of liquid hexafluoropropylene and the circulation of tail gas.

[0042] When in use, the refrigerant is introduced into the cover shell 402 through the refrigerant inlet 401 and returned to the external refrigeration equipment through the refrigerant outlet 403 to reduce the temperature of the reaction zone 101 to -80°C; then liquid hexafluoropropylene is added through the hexafluoropropylene inlet 501, and the added amount is confirmed by the liquid level meter equipped with the kettle body 1. The hexafluoropropylene will flow to the microporous plate 3 through the gap between the cover shell 402 and the luminescent cold trap 2.

[0043] Then, the luminescent cold trap 2 is opened, and oxygen is slowly introduced into the kettle body 1 through the oxygen inlet 502. The reaction begins, and the generated tail gas is discharged through the gap between the cover 402 and the luminescent cold trap 2 and the exhaust port 504, and is sent to the rear end condenser of the kettle body 1 for condensation, and then to the tail gas treatment system. The reaction temperature is controlled at -60 to -20°C, and the reaction time is 10 to 24 hours. After the reaction time is reached, the oxygen is stopped, and the raw materials in the reaction zone 101 are transported to the recovery zone 102 through the liquid phase transport pipe 503, and the reaction zone 101 continues to carry out the next batch of reactions according to the above process.

[0044] The raw materials entering the recovery zone 102 are naturally heated, and the hexafluoropropylene and small molecules that have not completed the reaction are gasified and re-enter the reaction zone 101 through the microporous plate 3 to continue to participate in the reaction. After the temperature of the recovery zone 102 reaches room temperature, the remaining materials can be discharged through the discharge port 505.

[0045] It should be noted that, in this embodiment, the external refrigeration equipment, condenser and exhaust gas treatment system are not shown in the figure, and the process monitoring instruments such as the pressure gauge, thermometer and liquid level gauge equipped on the kettle body 1 are also not shown in the figure. This does not affect the implementation of the scheme in this embodiment, and they are all existing mature technologies and will not be described in detail here.

[0046] In summary, the use of the microporous plate 3 allows oxygen and liquid hexafluoropropylene to be mixed evenly, allowing the reaction to proceed smoothly without the need for a stirring structure for mixing, thereby ensuring the service life of the luminescent cold trap 2, effectively simplifying the internal structure of the kettle body 1, reducing production costs and improving the overall stability of the equipment.

[0047] The use of the enclosure 402 for surrounding cooling is different from the conventional jacket cooling, which can effectively reduce the temperature difference in the reaction zone 101, improve the temperature control effect, and make the molecular weight of the produced product more concentrated.

[0048] By setting the recovery zone 102 below the reaction zone 101 without insulation, when the product of the reaction zone 101 enters the recovery zone 102 through the liquid phase transfer pipe 503, the raw materials and small molecules that are naturally heated can be gasified and then enter the reaction zone 101 through the microporous plate 3, thereby achieving the purpose of production while recycling, saving time for separate recycling, effectively avoiding waste of raw materials, and reducing accidents of poisoning caused by subsequent leakage of small molecules, and the overall practicality is higher.

[0049] Embodiment 2:

[0050] See also Figures 1 to 7 On the basis of Example 1, considering that as the reaction proceeds, raw materials often adhere to the outer surface of the luminescent cold trap 2 and the inner wall of the cover 402 corresponding to the luminescent cold trap 2, thereby affecting the subsequent use of the luminescent cold trap 2 and failing to ensure effective utilization of the raw materials.

[0051] To this end, the microporous plate 3 is improved: the microporous plate 3 now includes a circular plate 301 fixedly connected to the kettle body 1 and a slide 302 that slides up and down with the circular plate 301. The number of slides 302 corresponds to the number of luminescent cold traps 2 and the position also corresponds up and down. The slide 302 is designed as a whole in a cylindrical shape, and the diameter of the inner wall is adapted to the diameter of the outer surface of the luminescent cold trap 2, and the diameter of its outer surface is adapted to the diameter of the spacing. When the slide 302 rises based on the circular plate 301, the inner wall of the slide 302 can contact the outer surface of the luminescent cold trap 2, and its outer surface can contact the inner wall of the luminescent cold trap 2 corresponding to the cover 402, thereby achieving effective cleaning of the outer surface of the luminescent cold trap 2 and the inner wall corresponding to the cover 402.

[0052] In order to realize the movement of the slide 302 based on the circular plate 301, the surface of the kettle body 1 is provided with an adjustment component 6 fixedly connected to all the slides 302. The adjustment component 6 enters from the top of the kettle body 1, passes through the gap between the cover shell 402 and the luminous cold trap 2, and then is fixedly connected to the top of the slide 302, which can drive the slide 302 to move up and down based on the kettle body 1.

[0053] It can be understood that the circular plate 301 and the slide cylinder 302 are both of the same structural design as the microporous plate 3, and both can block the liquid hexafluoropropylene and allow the gas to pass through.

[0054] Reference Figure 4 and Figure 7 In this embodiment, preferably, the adjustment assembly 6 includes a base 601 fixedly mounted outside the kettle body 1, a motor 602 is fixedly mounted on the bottom surface of the base 601, and the motor 602 has a forward and reverse function and a long rod 603 is fixedly mounted on its output shaft, and the long rod 603 is rotatably mounted on the base 601 to ensure its stability. A bracket 604 is threadedly sleeved on the outer surface of the long rod 603, and a partition 605 is fixedly mounted on the end of the bracket 604 away from the long rod 603, and a connecting rod 606 fixedly connected to the slide 302 is fixedly mounted on the bottom of the partition 605.

[0055] The number of connecting rods 606 corresponds to that of the slide cylinder 302 and they are fixedly connected one by one. The connecting rods 606 also penetrate the top surface of the kettle body 1, pass through the gap between the cover shell 402 and the luminescent cold trap 2, and then are fixedly connected to the slide cylinder 302. At the same time, a notch is formed on the surface of the partition 605 to facilitate the disassembly, assembly and replacement of the luminescent cold trap 2.

[0056] When in use, oxygen and liquid hexafluoropropylene are effectively reacted through structures such as the microporous plate 3 and the cover 402. The working process and effect of this part are the same as those in the first embodiment, and will not be repeated here. The difference is that the motor 602 can be started to drive the long rod 603 to rotate, and the long rod 603 can drive the connecting rod 606 and the slide 302 to rise and fall through the bracket 604 and the partition 605; when the slide 302 rises, the inner wall of the slide 302 can contact the outer surface of the luminescent cold trap 2, and its outer surface can contact the inner wall of the luminescent cold trap 2 corresponding to the cover 402; when the slide 302 descends, the top surface of the slide 302 can be flush with the top surface of the circular plate 301, and the inner wall of the slide 302 can move along the top surface of the circular plate 301 when descending.

[0057] Compared with the first embodiment, the slide 302 can be driven to move up and down based on the circular plate 301 by the cooperation of the support 604, the connecting rod 606, the circular plate 301 and the slide 302, so as to realize the effective cleaning of the outer surface of the luminescent cold trap 2 and the corresponding inner wall of the cover 402, and avoid the adhesion of raw materials in the long-term polymerization process, thereby ensuring the stable use effect of the luminescent cold trap 2 and ensuring the full effective utilization of the raw materials. The overall scheme is combined with the setting of the microporous plate 3. When the slide 302 descends, it can be kept flush with the circular plate 301, which will not affect the raw material transportation from the reaction zone 101 to the recovery zone 102, and the slide 302 itself can be scraped; at the same time, when the slide 302 descends based on the circular plate 301, it also has a certain disturbance effect on the raw materials in the recovery zone 102, which can accelerate the gasification of hexafluoropropylene and small molecules that have not completed the reaction, further improve the overall work efficiency, and have stronger applicability.

[0058] Embodiment three:

[0059] See also Figures 1 to 10 On the basis of the second embodiment, considering that the slide 302 has a tendency to move up and down, its cleaning effect on the outer surface of the luminescent cold trap 2 and the corresponding inner wall of the cover 402 is very limited, and there is still room for improvement.

[0060] To this end, the circular plate 301 and the slide cylinder 302 are improved: at this time, the structure of the slide cylinder 302 remains unchanged, and two embedded blocks 303 are rotatably installed on the top surface of the circular plate 301, and the two embedded blocks 303 are movably fitted with the slide cylinder 302, and the two embedded blocks 303 and the slide cylinder 302 are combined to form a closed circle, so that the slide cylinder 302 can rotate based on the circular plate 301, and can drive the embedded blocks 303 to rotate synchronously during the rotation, while the lifting and lowering of the slide cylinder 302 cannot drive the embedded blocks 303 to move.

[0061] In order to realize the rotation of the slide 302, a rotating component 7 is arranged between the long rod 603, the kettle body 1 and the connecting rod 606. When the long rod 603 rotates, on the one hand, the connecting rod 606 is driven to rise and fall through the bracket 604 and the partition 605, and on the other hand, the connecting rod 606 is driven to rotate through the rotating component 7, so that the slide 302 has the lifting and rotating processes at the same time.

[0062] Reference Figure 8 and Fig.10 In this embodiment, preferably: the rotating component 7 includes a ring 701 rotatably mounted on the top surface of the kettle body 1 and for the connecting rod 606 to be slidably mounted, the ring 701 can rotate on the top surface of the kettle body 1 to drive the connecting rod 606 to rotate, and the connecting rod 606 can slide up and down based on the ring 701, and the top surface of the ring 701 and the top surface of the long rod 603 are fixedly installed with pulleys 702, and belts are installed between all the pulleys 702 for common transmission, so that when the long rod 603 rotates, all the rings 701 can be driven to rotate synchronously.

[0063] When in use, through the microporous plate 3 and the cover 402 and other structures, oxygen and liquid hexafluoropropylene are effectively reacted; through the support 604, the connecting rod 606 and the slide 302 and other structures, the slide 302 can be driven to rise and fall to clean the outer surface of the luminous cold trap 2 and the corresponding inner wall of the cover 402. The working process and effect of this part are the same as those in the second embodiment, and will not be repeated here. The difference is that when the long rod 603 rotates, on the one hand, the connecting rod 606 is driven to rise and fall through the support 604 and the partition 605. At this time, the connecting rod 606 can drive the slide 302 to rise and fall synchronously based on the ring 701. On the other hand, the long rod 603 drives the ring 701 to rotate through the pulley 702, and the ring 701 can drive the connecting rod 606 to rotate synchronously, so that the slide 302 can be both raised and lowered and rotated.

[0064] Compared with the second embodiment, the cooperation of the long rod 603, the ring 701, the connecting rod 606 and the pulley 702 can drive the slide 302 to simultaneously form a lifting and rotating process, thereby effectively cleaning the outer surface of the luminescent cold trap 2 and the corresponding inner wall of the cover 402, further improving the long-term use effect of the luminescent cold trap 2. The overall solution is combined with the rotation of the long rod 603, and the rotation of the slide 302 also acts on the raw materials in the recovery area 102 when descending, which can further improve the overall work efficiency, have stronger functionality, and meet more needs in actual use.

Claims

1. A device for continuous polymerization of perfluoropolyether, comprising a kettle and a plurality of luminescent cold traps arranged in the kettle, characterized in that: A microporous plate for placing raw materials and allowing oxygen to pass through is fixedly installed in the kettle body. The kettle body is divided into a reaction zone and a recovery zone located below by the microporous plate. A generating component and a cooling component that is sleeved outside all the luminescent cold traps are arranged on the kettle body, and the cooling component acts on the reaction zone.

2. The apparatus for continuous polymerization of perfluoropolyether according to claim 1, characterized in that: The generating assembly comprises a hexafluoropropylene inlet, an oxygen inlet, a liquid phase transport pipe, an exhaust port and a discharge port connected to the kettle body; the hexafluoropropylene inlet and the exhaust port are both located at the top of the kettle body; the oxygen inlet and the discharge port are both located below the microporous plate; and the liquid phase transport pipe is respectively connected to the reaction zone and the recovery zone.

3. The apparatus for continuous polymerization of perfluoropolyether according to claim 2, characterized in that: The liquid phase transport pipe is designed to be U-shaped, and a control valve is arranged on the pipe wall.

4. The apparatus for continuous polymerization of perfluoropolyether according to claim 2, characterized in that: The cooling component includes a cover shell fixedly installed in the kettle body and sleeved outside all the luminescent cold traps. A refrigerant inlet and a refrigerant outlet connected to the cover shell are fixedly installed on the outer surface of the kettle body, and a distance is set between the cover shell and the outer surface of the luminescent cold trap.

5. The apparatus for continuous polymerization of perfluoropolyether according to claim 4, characterized in that: The cooling component also includes a heat-insulating layer fixedly installed on the outer surface of the kettle body, and the refrigerant inlet and the refrigerant outlet are designed to penetrate the heat-insulating layer.

6. The apparatus for continuous polymerization of perfluoropolyether according to claim 4, characterized in that: The top surface of the cover shell is fixedly connected to the inner top wall of the kettle body, and the hexafluoropropylene inlet and the exhaust port correspond to the spacing up and down.

7. The apparatus for continuous polymerization of perfluoropolyether according to claim 6, characterized in that: The microporous plate includes a circular plate fixedly connected to the kettle body and a slide cylinder that slides up and down with the circular plate. The number and position of the slide cylinder correspond to the luminescent cold traps. When the slide cylinder slides up based on the circular plate, the inner wall of the slide cylinder can contact the outer surface of the luminescent cold trap, and its outer surface can contact the inner wall of the corresponding luminescent cold trap of the cover shell.

8. The apparatus for continuous polymerization of perfluoropolyether according to claim 7, characterized in that: The surface of the kettle body is provided with an adjusting assembly fixedly connected to all the slide cylinders; starting the adjusting assembly can drive the slide cylinder to move based on the circular plate.

9. The apparatus for continuous polymerization of perfluoropolyether according to claim 8, characterized in that: The adjustment component includes a base fixedly installed outside the kettle body, a motor fixedly installed on the bottom surface of the base, a long rod fixedly installed on the output shaft of the motor, a bracket threadedly sleeved on the outer surface of the long rod, a partition fixedly installed on the end of the bracket away from the long rod, and a connecting rod fixedly connected to the slide cylinder fixedly installed on the bottom of the partition.

10. The apparatus for continuous polymerization of perfluoropolyether according to claim 9, characterized in that: The number of the connecting rods corresponds to that of the slide cylinders and they are fixedly connected one by one. The connecting rods penetrate the top surface of the kettle body and pass through the gap between the cover shell and the luminescent cold trap.

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