Polytetrafluoroethylene high-pressure aeration polymerization reactor

Abstract

The utility model relates to the related technical field of polymerization reactor, specifically a kind of polytetrafluoroethylene high-pressure ventilation polymerization reactor, be arranged on mounting bracket, the stirring mechanism is installed in the reaction kettle, the upper and lower end of the reaction kettle is formed with first air pipe and second air pipe;It further includes the first pressure relief valve and second pressure relief valve of the reaction kettle;Symmetrically arranged channel adjusting member, one of which is respectively communicated with the first air pipe and the second air pipe, another is respectively communicated with the first pressure relief valve and the second pressure relief valve, controlled by intermittent driving element mounted on the mounting bracket, the utility model ensures that inert gas is evenly diffused in the reaction kettle at the same time, by the flow direction of inert gas in the reaction kettle is automatically switched, can effectively reduce dead angle, ensure that inert gas is in the reaction kettle and the full contact of reactant, to speed up the removal of residual oxygen in the reaction kettle, improve inert gas replacement efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of polymerization reactors, specifically a high-pressure gas-feeding polymerization reactor for polytetrafluoroethylene. Background Technology

[0002] The polymerization of polytetrafluoroethylene (PTFE) is a process in which monomer molecules (tetrafluoroethylene) polymerize under specific conditions to form a high molecular weight compound. The polymerization of PTFE is highly sensitive to oxygen and impurities; the presence of oxygen can lead to runaway reaction or explosive decomposition. Therefore, it is necessary to purge the reaction vessel with an inert gas (such as nitrogen or argon) before the reaction to effectively remove oxygen and provide a stable reaction environment.

[0003] In existing reactors, inert gas (such as nitrogen) is introduced into the reactor through an inlet duct to replace residual air and active materials. During the replacement process, an oxygen sensor monitors the oxygen content inside the reactor to ensure it remains below a safe threshold. However, in the case of unidirectional diffusion of inert gas, the fixed gas flow direction prevents effective coverage of the entire reactor space, resulting in some areas where air or impurities are not fully replaced, thus reducing the efficiency of inert gas replacement. Utility Model Content

[0004] The purpose of this invention is to provide a high-pressure gas-purified polymerization reactor for polytetrafluoroethylene (PTFE) to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A high-pressure gas-insulated polymerization reactor for polytetrafluoroethylene is mounted on a mounting frame. The reactor is equipped with a stirring mechanism. A first gas inlet pipe and a second gas inlet pipe are formed at the upper and lower ends of the reactor, and inert gas can enter along the tangential direction of the reactor.

[0007] It also includes a first pressure relief valve and a second pressure relief valve installed in the reactor, for venting air from the reactor shown.

[0008] The symmetrically arranged channel regulating components, one of which is connected to the first air inlet pipe and the second air inlet pipe respectively, and the other is connected to the first pressure relief valve and the second pressure relief valve respectively, are controlled by an intermittent drive component mounted on the mounting bracket, so that the inert gas can flow multiple times from top to bottom and from bottom to top in the reactor along a spiral trajectory.

[0009] The polytetrafluoroethylene high-pressure gas-breathing polymerization reactor described above: the first pressure relief valve is located at the lower end of the reactor, and the other end of the first pressure relief valve away from the reactor is connected to an extension pipe arranged in an L-shape.

[0010] The polytetrafluoroethylene high-pressure gas-feed polymerization reactor described above: the channel regulating component includes a three-way valve, a ball valve is rotatably installed inside the three-way valve, and multiple interconnected through holes are formed on the ball valve. A rotating shaft that can pass through the three-way valve and is rotatably connected to the three-way valve is fixedly installed on the ball valve.

[0011] The polytetrafluoroethylene high-pressure gas-breathing polymerization reactor described above: a connecting shaft is rotatably mounted on the mounting frame, and both ends of the connecting shaft are fixed to the rotating shaft respectively.

[0012] The polytetrafluoroethylene high-pressure gas-feed polymerization reactor as described above: the intermittent drive component includes a lead screw, which is rotatably mounted on the mounting frame via a receiving plate, and the lead screw is driven to rotate by a servo motor fixedly mounted on the receiving plate, and a threaded sleeve is threadedly connected to the lead screw;

[0013] It also includes an intermittent transmission component mounted on the receiving plate, and the movement of the threaded sleeve drives the intermittent transmission component.

[0014] The polytetrafluoroethylene high-pressure gas-feed polymerization reactor as described above: the intermittent transmission component includes a transmission shaft rotatably mounted on the receiving plate, the transmission shaft being connected to the connecting shaft via a toothed belt, and a connecting sleeve being sleeved along the axial direction of the transmission shaft, the connecting sleeve being fixed to the threaded sleeve via a connecting hoop.

[0015] The polytetrafluoroethylene high-pressure gas-breathing polymerization reactor described above has a limiting groove formed on the drive shaft, and a ball bearing that slides in cooperation with the limiting groove is movably disposed on the inner wall of the connecting cylinder.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] Under the control of the intermittent drive, the two channel regulators are changed simultaneously, so that the inert gas enters the reactor from the first or second inlet pipe respectively, flows spirally from bottom to top, and is discharged through the channel regulators from the first or second pressure relief valve. This allows the inert gas to flow repeatedly from top to bottom and from bottom to top along a spiral trajectory in the reactor, ensuring that the inert gas is evenly diffused in the reactor. At the same time, by automatically switching the flow direction of the inert gas in the reactor, dead zones can be effectively reduced, ensuring that the inert gas is in full contact with the reactants in the reactor, thereby accelerating the removal of residual oxygen in the reactor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a high-pressure gas-purified polymerization reactor for polytetrafluoroethylene.

[0019] Figure 2This is a schematic diagram of the structure of a high-pressure gas-purified polymerization reactor for polytetrafluoroethylene from another angle.

[0020] Figure 3 This is a schematic diagram of the internal structure of a high-pressure gas-purified polymerization reactor for polytetrafluoroethylene.

[0021] Figure 4 This is a schematic diagram of the first and second air inlet pipes in a high-pressure gas-breathing polymerization reactor for polytetrafluoroethylene.

[0022] Figure 5 This is a schematic diagram of the channel regulating component in a high-pressure gas-purified polymerization reactor for polytetrafluoroethylene.

[0023] Figure 6 This is a schematic diagram of the intermittent drive component in a high-pressure gas-feed polymerization reactor for polytetrafluoroethylene.

[0024] Figure 7 This is a schematic diagram of the connecting cylinder and threaded sleeve in a high-pressure gas-purified polymerization reactor for polytetrafluoroethylene.

[0025] In the diagram: 1. Mounting bracket; 2. Stirring mechanism; 3. Receiving plate; 4. First air inlet pipe; 5. Second air inlet pipe; 6. Three-way valve; 7. First pressure relief valve; 8. Second pressure relief valve; 9. Rotary shaft; 10. Ball valve; 11. Connecting shaft; 12. Toothed belt; 13. Drive shaft; 1301. Limiting groove; 14. Lead screw; 15. Servo motor; 16. Connecting clamp; 17. Threaded sleeve; 18. Connecting cylinder; 1801. Ball bearing. Detailed Implementation

[0026] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0027] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0028] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0029] Please see Figures 1-7In this embodiment of the present invention, a high-pressure gas-insulated polymerization reactor for polytetrafluoroethylene is mounted on a mounting frame 1. A stirring mechanism 2 is installed inside the reactor. A first air inlet pipe 4 and a second air inlet pipe 5 are formed at the upper and lower ends of the reactor, and inert gas can enter along the tangential direction of the reactor.

[0030] It also includes a first pressure relief valve 7 and a second pressure relief valve 8 installed in the reactor, for venting air from the reactor shown.

[0031] The symmetrically arranged channel regulating components, one of which is connected to the first air inlet pipe 4 and the second air inlet pipe 5 respectively, and the other is connected to the first pressure relief valve 7 and the second pressure relief valve 8 respectively, are controlled by an intermittent drive component mounted on the mounting bracket 1, so that the inert gas can flow multiple times from top to bottom and from bottom to top in the reactor along a spiral trajectory.

[0032] It should be noted that one of the regulating channels is connected to an inert gas delivery pump, and the other is connected to a purification tower. The polymerization reaction of polytetrafluoroethylene (PTFE) may result in residual PTFE monomers. If oxygen mixed with PTFE monomers is directly released into the air, it could pose an explosion risk. Furthermore, unreacted fluorinated gases have a strong greenhouse effect and must be decomposed into harmless substances through a dedicated treatment system (such as combustion or adsorption) before being released into the environment.

[0033] In this embodiment, during the polymerization reaction of polytetrafluoroethylene, in order to prevent oxygen from interfering with the reaction, inert gas replacement is required. The intermittent drive is activated, and the gas enters the reactor through the first inlet pipe 4 via one of the channel regulators. At this time, the stirring mechanism 2 in the reactor performs stirring, so that the inert gas entering tangentially along the reactor can flow in a spiral shape from top to bottom along the inner wall of the reactor. When the pressure inside the reactor reaches the threshold, the first pressure relief valve 7 opens, allowing the oxygen in the reactor to be discharged through the other channel regulator. Under the control of the intermittent drive, the two channel regulators are changed simultaneously, so that the inert gas enters the reactor through the second inlet pipe 5, flows in a spiral shape from bottom to top, and is discharged through the second pressure relief valve 8 via the channel regulator. This ensures that the inert gas diffuses evenly in the reactor. By automatically switching the flow direction of the inert gas in the reactor, dead zones can be effectively reduced, ensuring that the inert gas is in full contact with the reactants in the reactor, thereby accelerating the removal of residual oxygen in the reactor.

[0034] Preferably, the first pressure relief valve 7 is located at the lower end of the reactor, and the other end of the first pressure relief valve 7 away from the reactor is connected to an L-shaped extension pipe. This is mainly to prevent liquid leakage from the reactor, and the height of the extension pipe needs to be higher than the height of the liquid in the reactor.

[0035] For further solutions to this utility model, please refer to [link / reference]. Figure 4 The channel regulating component includes a three-way valve 6, a ball valve 10 is rotatably installed inside the three-way valve 6, and a plurality of interconnected through holes are formed on the ball valve 10. A rotating shaft 9 that can pass through the three-way valve 6 and is rotatably connected to the three-way valve 6 is fixedly installed on the ball valve 10.

[0036] The through hole includes a first round hole, a second round hole, and a third round hole, which are directly connected to the first air inlet pipe 4 and the second air inlet pipe 5. The first round hole is always aligned with the inlet of the delivery pump. By controlling the rotation of the rotating shaft 9, the second round hole can be intermittently aligned with the first air inlet pipe 4 and the third round hole can be aligned with the second air inlet pipe 5. The second round hole and the third round hole are perpendicular to each other, and it is impossible for the second round hole and the third round hole to be aligned with the first air inlet pipe 4 and the second air inlet pipe 5 at the same time.

[0037] It should be noted that the two ball valves 10 are asymmetrically arranged.

[0038] A connecting shaft 11 is rotatably mounted on the mounting bracket 1, and both ends of the connecting shaft 11 are fixed to the rotating shaft 9.

[0039] For further solutions to this utility model, please refer to [link / reference]. Figure 5 , Figure 6 and Figure 7 The intermittent drive component includes a lead screw 14, which is rotatably mounted on the mounting frame 1 via a receiving plate 3, and is driven to rotate by a servo motor 15 fixedly mounted on the receiving plate 3. A threaded sleeve 17 is threadedly connected to the lead screw 14.

[0040] It also includes an intermittent transmission component mounted on the receiving plate 3, and the movement of the threaded sleeve 17 drives the intermittent transmission component.

[0041] The intermittent transmission component includes a transmission shaft 13 rotatably mounted on the receiving plate 3. The transmission shaft 13 is connected to the connecting shaft 11 via a toothed belt 12. A connecting sleeve 18 is sleeved along the axial direction of the transmission shaft 13. The connecting sleeve 18 is fixed to the threaded sleeve 17 via a connecting clamp 16.

[0042] Preferably, a limiting groove 1301 is formed on the drive shaft 13, and a ball bearing 1801 that slides in cooperation with the limiting groove 1301 is movably disposed on the inner wall of the connecting cylinder 18.

[0043] The limiting groove 1301 is divided into a first straight groove, a first threaded groove, a second straight groove, a second threaded groove and a third straight groove. The lengths of the first straight groove and the third straight groove are equal to the length of the second straight groove. The thread directions of the first threaded groove and the second threaded groove are opposite, and the threaded rings are the same.

[0044] In the initial state, the ball bearing 1801 is located in the first or third linear groove. When the servo motor 15 is started, the output shaft of the servo motor 15 is fixed to the lead screw 14, so that when the output shaft rotates, it drives the lead screw 14 to rotate synchronously. When the lead screw 14 rotates, it drives the threaded sleeve 17 to move linearly along the axis of the lead screw 14, thereby driving the connecting clamp 16 to move accordingly, so as to realize the driving requirement of the connecting sleeve 18 moving relative to the transmission shaft 13.

[0045] When the connecting cylinder 18 moves relative to the drive shaft 13, the balls 1801 on it are located in the first or third straight groove, and the drive shaft 13 does not rotate. When the balls 1801 move to the first or second threaded groove, the balls 1801 exert an inclined force on the drive shaft 13, causing the drive shaft 13 to rotate. Under the drive of the toothed belt 12, the connecting shaft 11 rotates, thereby simultaneously changing the flow path of the gas in the two three-way valves 6, so as to realize the automatic switching of the flow direction of the inert gas in the reactor.

[0046] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0047] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-pressure gas-purified polymerization reactor for polytetrafluoroethylene, mounted on a mounting frame (1), wherein a stirring mechanism (2) is installed inside the reactor, characterized in that, The upper and lower ends of the reactor are provided with a first inlet pipe (4) and a second inlet pipe (5), and inert gas can enter along the tangential direction of the reactor. It also includes a first pressure relief valve (7) and a second pressure relief valve (8) installed in the reactor to remove air from the reactor. The symmetrically arranged channel regulating components, one of which is connected to the first air inlet pipe (4) and the second air inlet pipe (5) respectively, and the other is connected to the first pressure relief valve (7) and the second pressure relief valve (8) respectively, are controlled by an intermittent drive component installed on the mounting bracket (1), so that the inert gas can flow multiple times from top to bottom and from bottom to top in the reactor along a spiral trajectory.

2. The polytetrafluoroethylene high-pressure aerated polymerization reactor according to claim 1, characterized in that, The first pressure relief valve (7) is located at the lower end of the reactor, and the other end of the first pressure relief valve (7) away from the reactor is connected to an extension pipe arranged in an L-shape.

3. The polytetrafluoroethylene high-pressure aerated polymerization reactor according to claim 1, characterized in that, The channel regulating component includes a three-way valve (6), a ball valve (10) is rotatably installed inside the three-way valve (6), and a plurality of interconnected through holes are formed on the ball valve (10). A rotating shaft (9) that can pass through the three-way valve (6) and is rotatably connected to the three-way valve (6) is fixedly installed on the ball valve (10).

4. The high-pressure aerated polymerization reactor for polytetrafluoroethylene according to claim 3, characterized in that, A connecting shaft (11) is rotatably mounted on the mounting bracket (1), and both ends of the connecting shaft (11) are fixed to the rotating shaft (9).

5. The polytetrafluoroethylene high-pressure aerated polymerization reactor according to claim 4, characterized in that, The intermittent drive component includes a lead screw (14), which is rotatably mounted on the mounting bracket (1) via a receiving plate (3), and the lead screw (14) is driven to rotate by a servo motor (15) fixedly mounted on the receiving plate (3). A threaded sleeve (17) is threadedly connected to the lead screw (14). It also includes an intermittent transmission component mounted on the receiving plate (3), and the movement of the threaded sleeve (17) drives the intermittent transmission component.

6. The polytetrafluoroethylene high-pressure aerated polymerization reactor according to claim 5, characterized in that, The intermittent transmission component includes a transmission shaft (13) rotatably mounted on the receiving plate (3), the transmission shaft (13) being connected to the connecting shaft (11) via a toothed belt (12), and a connecting sleeve (18) being sleeved along the axial direction of the transmission shaft (13), the connecting sleeve (18) being fixed to the threaded sleeve (17) via a connecting hoop (16).

7. The polytetrafluoroethylene high-pressure aerated polymerization reactor according to claim 6, characterized in that, A limiting groove (1301) is formed on the drive shaft (13), and a ball (1801) that slides in cooperation with the limiting groove (1301) is movably arranged on the inner wall of the connecting cylinder (18).

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