A device for efficiently removing PTMEG impurities and a purification process thereof

Abstract

This invention discloses a highly efficient device for removing PTMEG impurities and its purification process, comprising an impurity removal mechanism and a fine filtration mechanism. The impurity removal mechanism is connected to the fine filtration mechanism via a connecting pipe, on which a solenoid valve for controlling the flow of materials is fixedly installed. This invention relates to the field of PTMEG production and purification technology. This highly efficient device for removing PTMEG impurities and its purification process utilizes a centrifugal drive component to drive the impurity removal filter cartridge to rotate at high speed. Centrifugal force forces high-viscosity PTMEG material to quickly penetrate the filter pores, significantly reducing the filtration resistance of high-viscosity materials and significantly improving filtration efficiency. Simultaneously, relying on the continuous relative sliding between the rotating filter cartridge and the fixed cleaning brush plate, gel, coke, and fine particles adhering to the filter pore surface are cleaned in real time, fundamentally preventing filter pore clogging and pressure differential increases. This achieves online self-cleaning and continuous permeability during the filtration process, completely solving the core industry pain points of traditional static filtration, such as easy clogging, low efficiency, and inability to operate continuously.

Description

Technical Field

[0001] This invention relates to the field of PTMEG production and purification technology, specifically to an apparatus and purification process for efficiently removing PTMEG impurities. Background Technology

[0002] PTMEG, short for polytetramethylene ether glycol, also known as polytetrahydrofuran ether glycol, is a high-performance polyether polymer raw material prepared by ring-opening polymerization of tetrahydrofuran. PTMEG is a white waxy solid at room temperature, and becomes a transparent liquid after melting when heated. It has the structural characteristics of no side chains and regular molecular arrangement, which endows it with excellent elasticity, low temperature resistance, wear resistance and hydrolytic stability. It is a core soft segment raw material for the preparation of spandex fibers, thermoplastic polyurethanes and high-end elastomer materials, and is widely used in textiles, medical devices, high-end rubber and plastics and other fields.

[0003] The reference patent title is: An Ion Exchange Resin Filtration System for PTMEG Production (Authorization Announcement No.: CN218011528U, Authorization Announcement Date: 2022.12.13), which includes filter I, filter II, filter III, feed line I, feed line II, discharge line I, and discharge line II. Feed line I is connected to the inlet of filter I through shut-off valve I, and to the inlet of filter II through shut-off valve II. Feed line II is connected to the inlet of filter II through shut-off valve III, and to the inlet of filter III through shut-off valve IV. The discharge port of filter I is connected to discharge line I through shut-off valve V. The discharge port of filter II is split into two lines through shut-off valve VI, one line is connected to discharge line I through shut-off valve VIII, and the other line is connected to discharge line II through shut-off valve IX. The discharge port of filter III is connected to discharge line II through shut-off valve VII. This practical filter is interconnected, increasing the operating space of the device.

[0004] Based on the aforementioned documents, traditional PTMEG impurity removal equipment mostly employs static pressure filtration, relying on material pressure permeation to achieve solid-liquid separation, lacking a centrifugal dynamic auxiliary filtration structure. Given PTMEG's high viscosity, poor flowability, and easy adhesion of impurities, static filtration exhibits extremely high resistance, with viscous gels and coke particles easily accumulating and clogging filter pores, resulting in slow filtration rates and extremely low operating efficiency. Furthermore, traditional equipment relies solely on simple filter screens to intercept impurities, leading to large particles easily compacting and adhering to the filter media surface, making timely removal impossible. Long-term operation can cause a surge in equipment pressure differential and filtration failure, failing to meet the stable impurity removal requirements of high-viscosity PTMEG materials. Therefore, this invention provides a highly efficient device for removing PTMEG impurities and its purification process. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an efficient device and purification process for removing PTMEG impurities, solving the problems of existing PTMEG impurity removal equipment lacking centrifugal dynamic impurity removal capability and having poor self-cleaning and anti-clogging effects.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device for efficiently removing PTMEG impurities, comprising an impurity removal mechanism and a fine filtration mechanism, wherein the impurity removal mechanism is connected to the fine filtration mechanism via a connecting pipe, and a solenoid valve for controlling the flow of material is fixedly installed on the connecting pipe; the impurity removal mechanism includes: A cleaning assembly includes a cleaning box, an inner cavity of which is provided with a cleaning filter cartridge. An assembly block is fixedly installed at the bottom of the cleaning filter cartridge. A guide rod is slidably inserted inside the cleaning box. An mounting plate is fixedly installed at one end of the guide rod. A cleaning brush plate is detachably connected to the mounting plate by bolts and nuts. The bristles of the cleaning brush plate are in contact with the outer surface of the cleaning filter cartridge. One end of the guide rod extends to the outside of the cleaning box and is fitted with a return spring. One end of the return spring is fixedly connected to the outer wall of the cleaning box, and the other end of the return spring is fixedly installed on the outer side of the end of the guide rod. The centrifugal drive assembly, located at the bottom of the impurity removal box, is used to drive the impurity removal filter cartridge to rotate at high speed, thereby realizing centrifugal solid-liquid impurity removal operation.

[0007] Preferably, the centrifugal drive assembly includes a drive motor fixedly installed at the bottom of the impurity removal box, the output end of the drive motor extending through into the impurity removal box and fixedly installed with an assembly shaft plate, the top of the assembly shaft plate having an assembly groove adapted to the assembly block.

[0008] Preferably, the assembly block is snapped into the assembly groove and is detachably fixed to the assembly shaft plate by a locking screw. A limit plate is fixedly installed on the outer wall of the impurity removal box. A cross groove is formed on the surface of the limit plate. The cross groove is composed of a shallow groove arranged horizontally and a deep groove arranged vertically.

[0009] Preferably, a control rod is fixedly installed on the outer side of the mounting plate, one end of the control rod extends slidably to the outside of the impurity removal box and is fixedly installed with a control plate, and the control plate can be slidably engaged inside the horizontal shallow groove or vertical deep groove of the cross groove.

[0010] Preferably, the top of the impurity removal box is provided with a top plate, and a feed pipe is fixedly connected to the center of the top of the top plate. A lifting handle is fixedly installed on the top of the top plate.

[0011] Preferably, the fine filtration mechanism includes a fine filtration tank, a filter plate is fixedly installed on the inner side wall of the fine filtration tank, a rotating motor is fixedly installed on the right side of the fine filtration tank, the output end of the rotating motor extends rotatably into the fine filtration tank and is fixedly installed with a rotating rod, the surface of the rotating rod is rotatably connected to the inside of the filter plate, a scraper is fixedly installed on the surface of the rotating rod, and the side of the scraper is tightly fitted with the end face of the filter plate.

[0012] Preferably, a feed pipe is fixedly installed on the lower right side of the fine filtration tank, and a solenoid valve for controlling the flow of feed is fixedly installed on the feed pipe.

[0013] This invention also discloses a purification process for an efficient device for removing PTMEG impurities, comprising the following steps: S1. Material feeding pretreatment: Molten PTMEG coarse material is fed into the impurity removal filter cartridge inside the impurity removal box at a uniform speed to maintain the material in a constant temperature molten state, ensure the material flowability, and provide a basis for subsequent centrifugal impurity removal operations; S2. Primary Centrifugal Self-Cleansing: The centrifugal drive assembly drives the filter cartridge to rotate at high speed. The centrifugal force causes the liquid PTMEG material to quickly penetrate the filter cartridge, while solid coke residue, gel particles, metal debris and other impurities inside the material are trapped on the inner wall of the filter cartridge. The guide rod, return spring and control plate limit positioning ensure that the cleaning brush plate is always in contact with the outer surface of the filter cartridge. During the rotation of the filter cartridge, it slides relative to the cleaning brush plate, cleaning the filter holes of impurities in real time and ensuring the continuous transparent operation of the filter cartridge. S3. Pressure-stabilized conveying and feeding: Open the solenoid valve on the connecting pipe, and the PTMEG material after the first-stage centrifugal impurity removal is steadily conveyed to the fine filtration mechanism through the connecting pipe. After the conveying is completed, close the solenoid valve to avoid material turbulence and ensure the stability of subsequent fine filtration. S4, Secondary Dynamic Precision Filtration: The PTMEG material is subjected to secondary precision filtration through a fine filtration mechanism to completely remove residual fine solid impurities. S5. Clean material discharge: After the secondary fine filtration operation is completed, the purified and impurity-removed high-purity PTMEG material is stably discharged to achieve continuous purification operation.

[0014] Beneficial effects This invention provides an efficient apparatus for removing PTMEG impurities and its purification process. Compared with existing technologies, it has the following advantages: 1. This device and purification process for efficiently removing PTMEG impurities utilizes a centrifugal drive component to rotate the filter cartridge at high speed. Centrifugal force forces high-viscosity PTMEG material to quickly penetrate the filter pores, significantly reducing the filtration resistance of high-viscosity materials and greatly improving filtration efficiency. Simultaneously, relying on the continuous relative sliding between the rotating filter cartridge and the fixed cleaning brush plate, gel, coke, and fine particles adhering to the filter pore surface are cleaned in real time. This fundamentally avoids problems such as filter pore clogging and increased pressure differential, achieving online self-cleaning and continuous permeability during the filtration process. It completely solves the core pain points of traditional static filtration, such as easy clogging, low efficiency, and inability to operate continuously.

[0015] 2. This device and purification process for efficiently removing PTMEG impurities features a switchable maintenance structure with a cross-groove limit and a reset spring, adaptable to centrifugal self-cleaning operation mode. This significantly reduces the difficulty of equipment maintenance. During normal filtration, the brush plate adheres to the outer wall of the filter cartridge for continuous self-cleaning and anti-clogging, ensuring continuous production. During equipment maintenance, the brush plate can be quickly switched to the detached state, allowing for the cleaning of thick layers of sludge accumulated on the inner wall of the filter cartridge without disassembling the main body of the equipment. This avoids the problems of frequent disassembly and cleaning, cumbersome maintenance, and production interruption associated with traditional filtration equipment, effectively reducing manual maintenance costs and ensuring continuous and stable operation of the production line.

[0016] 3. This device and its purification process for efficiently removing PTMEG impurities have a compact overall structure and strong automation adaptability. Through the linkage control of multiple sets of solenoid valves, it realizes the integrated continuous purification operation of PTMEG material feeding, centrifugal impurity removal, precision filtration, pressure stabilization conveying, and clean discharge. The whole set of devices specifically solves the industry pain points of traditional PTMEG impurity removal equipment, such as intermittent operation, poor adaptability, and unstable purification effect, effectively improving product purification quality and production efficiency, and adapting to the needs of large-scale industrial refining production of PTMEG. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the external structure of the present invention; Figure 2 This is a three-dimensional schematic diagram of the impurity removal component of the present invention; Figure 3 This is a schematic diagram of the assembly of the centrifugal drive assembly and the impurity removal filter cartridge of the present invention; Figure 4 An exploded view of the surface structure of the mounting plate and the cleaning brush plate of the present invention; Figure 5 This is a cross-sectional view of the internal structure of the fine filter tank of the present invention; Figure 6 This is a schematic diagram of the purification process of the present invention.

[0018] In the diagram: 1-Impurity removal mechanism, 11-Impurity removal component, 111-Impurity removal box, 112-Impurity removal filter cartridge, 113-Assembly block, 114-Guide rod, 115-Mounting plate, 116-Cleaning brush plate, 117-Reset spring, 12-Centrifugal drive component, 121-Drive motor, 122-Assembly shaft plate, 123-Assembly groove, 2-Fine filtration mechanism, 21-Fine filtration tank, 22-Filter plate, 23-Rotating motor, 24-Rotating rod, 25-Scraper, 3-Limiting plate, 4-Cross groove, 5-Control rod, 6-Control plate, 7-Top plate, 8-Feed pipe, 9-Lifting handle, 10-Guide pipe. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-6 The present invention provides a technical solution: An efficient device for removing PTMEG impurities includes an impurity removal mechanism 1 and a fine filtration mechanism 2. The impurity removal mechanism 1 is connected to the fine filtration mechanism 2 via a connecting pipe. A solenoid valve for controlling the flow of material is fixedly installed on the connecting pipe. The impurity removal mechanism 1 includes: The impurity removal assembly 11 includes an impurity removal box 111, an impurity removal filter cartridge 112 is provided in the inner cavity of the impurity removal box 111, an assembly block 113 is fixedly installed at the bottom of the impurity removal filter cartridge 112, a guide rod 114 is slidably passed through the inside of the impurity removal box 111, an mounting plate 115 is fixedly installed at one end of the guide rod 114, a cleaning brush plate 116 is detachably connected to the mounting plate 115 by bolts and nuts, the side of the brush bristles of the cleaning brush plate 116 is in contact with the outer surface of the impurity removal filter cartridge 112, one end of the guide rod 114 extends to the outside of the impurity removal box 111 and is fitted with a return spring 117, one end of the return spring 117 is fixedly connected to the outer side wall of the impurity removal box 111, and the other end of the return spring 117 is fixedly installed on the outer side of the end of the guide rod 114; The centrifugal drive assembly 12 is located at the bottom of the impurity removal box 111 and is used to drive the impurity removal filter cartridge 112 to rotate at high speed to realize centrifugal solid-liquid impurity removal operation.

[0021] The impurity removal box is vertically assembled with a filter cartridge. The filter cartridge adopts a one-piece structure with laser punching of stainless steel, which has high overall strength, uniform and smooth filter holes, no burrs or dead corners, and is not easily deformed under high-speed rotation conditions. It can effectively adapt to centrifugal filtration operations and brush body close-fitting cleaning conditions. The mounting plate can be detachably assembled with the cleaning brush plate using bolts and nuts. The detachable connection method makes it easy to replace the brush plate individually after it wears out, without having to replace the entire guide rod assembly, thus reducing maintenance and parts costs. The cleaning brush plate is made of wear-resistant and flexible bristle material. The bristle tips are closely attached to the outer circumferential filter surface of the filter cartridge. The contact gap is uniform and stable. It can continuously scrape the viscous gel and coke particles adhering to the filter hole surface during the high-speed rotation of the filter cartridge, clearing the filter hole in real time and preventing clogging and scale buildup. The two ends of the reset spring are fixedly connected to the outer wall of the impurity removal box and the outer end of the guide rod, respectively. Under normal conditions, the guide rod is pushed inward by the spring preload, so that the cleaning brush plate is always in close contact with the outer wall of the filter cartridge, ensuring the self-cleaning effect during normal operation. Under the action of external force, the guide rod can compress the reset spring and slide outward, realizing the state switch of the brush plate detaching from the filter cartridge. The centrifugal drive component 12 drives the impurity removal filter cartridge 112 to rotate at high speed, and the centrifugal force forces the high-viscosity PTMEG material to quickly penetrate the filter pores, which greatly reduces the filtration resistance of high-viscosity materials and significantly improves filtration efficiency. At the same time, the continuous relative sliding between the rotation of the filter cartridge and the fixed cleaning brush plate 116 cleans the gel, coke residue and fine particles adhering to the surface of the filter pores in real time, avoiding the problems of filter pore clogging and pressure difference increase from the root, realizing online self-cleaning and continuous permeability in the filtration process, and completely solving the core pain points of the industry that traditional static filtration is prone to clogging, has low efficiency and cannot operate continuously.

[0022] In this embodiment, the centrifugal drive assembly 12 includes a drive motor 121 fixedly installed at the bottom of the impurity removal box 111. The output end of the drive motor 121 extends through into the impurity removal box 111 and is fixedly installed with an assembly shaft plate 122. The top of the assembly shaft plate 122 is provided with an assembly groove 123 that is adapted to the assembly block 113.

[0023] The drive motor is a three-phase asynchronous motor. During operation, the drive motor drives the assembly shaft plate to rotate synchronously, which in turn drives the bottom assembly block and the impurity removal filter cartridge to rotate at high speed. The centrifugal force allows high-viscosity PTMEG material to quickly penetrate the filter cartridge pores, greatly overcoming the filtration resistance of high-viscosity material. Meanwhile, large particles of coke residue, gel agglomerates, metal fragments and other solid impurities are adhered to the inner wall of the filter cartridge by centrifugal interception, achieving efficient solid-liquid separation. In this embodiment, the assembly block 113 is snapped into the assembly groove 123 and is detachably fixed to the assembly shaft plate 122 by a locking screw. The outer wall of the impurity removal box 111 is fixedly installed with a limiting plate 3. The surface of the limiting plate 3 is provided with a cross groove 4, which is composed of a shallow groove arranged horizontally and a deep groove arranged vertically.

[0024] In this embodiment, a control rod 5 is fixedly installed on the outer side of the mounting plate 115. One end of the control rod 5 extends slidably to the outside of the impurity removal box 111 and is fixedly installed with a control plate 6. The control plate 6 can be slidably engaged in the horizontal shallow groove or vertical deep groove of the cross groove 4.

[0025] During normal production, the control board is inserted into the vertical deep groove of the cross groove, and the brush plate adheres to the outer wall of the filter cartridge, continuously completing centrifugal filtration and online self-cleaning operations. When the equipment needs to be stopped for maintenance and cleaning of accumulated slag, the control board is slid to switch to the horizontal shallow groove. The guide rod compresses the reset spring, causing the brush plate to detach from the surface of the filter cartridge. Workers can directly clean the thick layer of accumulated slag on the inner wall of the filter cartridge without disassembling the tank, filter cartridge, and other core components, greatly simplifying the maintenance process. In this embodiment, a top plate 7 is provided on the top of the impurity removal box 111, and a feed pipe 8 is fixedly connected to the center of the top of the top plate 7. A lifting handle 9 is fixedly installed on the top of the top plate 7.

[0026] In this embodiment, the fine filtration mechanism 2 includes a fine filtration tank 21. A filter plate 22 is fixedly installed on the inner side wall of the fine filtration tank 21. A rotating motor 23 is fixedly installed on the right side of the fine filtration tank 21. The output end of the rotating motor 23 extends rotatably into the fine filtration tank 21 and is fixedly installed with a rotating rod 24. The surface of the rotating rod 24 is rotatably connected to the inside of the filter plate 22. A scraper 25 is fixedly installed on the surface of the rotating rod 24. The side of the scraper 25 is tightly fitted with the end face of the filter plate 22.

[0027] A geared motor is selected for the rotary motor; The impurity removal box is equipped with a PLC control panel, which is electrically connected to the rotating motor, the drive motor and the solenoid valve respectively. It is used to control the start and stop of the motor, the speed, and to drive the solenoid valve to realize the opening and closing of the connecting pipe and the guide pipe. The switchable maintenance structure, featuring a cross-groove 4 limit switch and a reset spring 117, is adapted to the centrifugal self-cleaning operation mode, significantly reducing the difficulty of equipment maintenance. During normal filtration, the brush plate adheres to the outer wall of the filter cartridge for continuous self-cleaning and anti-clogging, ensuring continuous production. During equipment maintenance, the brush plate can be quickly switched to the detached state, allowing for the cleaning of thick layers of sludge accumulated on the inner wall of the filter cartridge without disassembling the main body of the equipment. This avoids the problems of frequent disassembly and cleaning, cumbersome maintenance, and production interruption associated with traditional filtration equipment, effectively reducing manual maintenance costs and ensuring the continuous and stable operation of the production line.

[0028] In this embodiment, a feed pipe 10 is also fixedly installed on the lower right side of the fine filter tank 21, and a solenoid valve for controlling the flow of material is fixedly installed on the feed pipe 10.

[0029] With a compact overall structure and strong automation adaptability, the device achieves integrated continuous purification of PTMEG materials through multi-group solenoid valve linkage control, including feeding, centrifugal impurity removal, precision filtration, pressure stabilization conveying, and clean discharge. The entire device specifically addresses the industry pain points of traditional PTMEG impurity removal equipment, such as intermittent operation, poor adaptability, and unstable purification effect, effectively improving product purification quality and production efficiency, and meeting the needs of large-scale industrial refining of PTMEG.

[0030] This invention also discloses a purification process for an efficient device for removing PTMEG impurities, comprising the following steps: S1. Material feeding pretreatment: Molten PTMEG coarse material is fed into the impurity removal filter cartridge 112 inside the impurity removal box 111 at a uniform speed to maintain the material in a constant temperature molten state, ensure the material flowability, and provide a basis for subsequent centrifugal impurity removal operations. S2. First-stage centrifugal self-cleaning: The centrifugal drive assembly 12 drives the impurity removal filter cartridge 112 to rotate at high speed. The centrifugal force causes the liquid PTMEG material to quickly penetrate the impurity removal filter cartridge 112. Impurities such as solid coke residue, gel particles, and metal fragments inside the material are trapped on the inner wall of the impurity removal filter cartridge 112. The guide rod 114 and the reset spring 117, together with the control plate 6, limit the positioning so that the cleaning brush plate 116 always adheres to the outer surface of the impurity removal filter cartridge 112. During the rotation of the filter cartridge, it slides relative to the cleaning brush plate 116, cleaning the filter holes of impurities in real time and ensuring the continuous permeable operation of the impurity removal filter cartridge 112. S3. Pressure-stabilized conveying and feeding: Open the solenoid valve on the connecting pipe, and the PTMEG material after the first-stage centrifugal impurity removal is steadily conveyed to the fine filtration mechanism 2 through the connecting pipe. After the conveying is completed, close the solenoid valve to avoid material turbulence and ensure the stability of subsequent fine filtration. S4, Secondary dynamic precision filtration: The PTMEG material is subjected to secondary precision filtration through the fine filtration mechanism 2 to completely remove residual fine solid impurities; S5. Clean material discharge: After the secondary fine filtration operation is completed, the purified and impurity-removed high-purity PTMEG material is stably discharged to achieve continuous purification operation.

[0031] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0032] First, molten PTMEG coarse material is fed uniformly into the impurity removal filter cartridge 112 inside the impurity removal box 111 through the feed pipe 8. The material is kept at a constant temperature and molten state to ensure the fluidity of the high-viscosity material, providing a basis for subsequent centrifugal impurity removal operations. Then, the centrifugal drive component 12 drives the impurity removal filter cartridge 112 to rotate at high speed. The centrifugal action causes the liquid PTMEG material to quickly penetrate the impurity removal filter cartridge 112. Solid impurities such as solid coke residue, gel particles, and metal fragments inside the material are trapped on the inner wall of the impurity removal filter cartridge 112. The guide rod 114 and the return spring 117 are used for elastic matching and limiting structure positioning to ensure that the cleaning brush plate 116 always adheres to the outer surface of the impurity removal filter cartridge 112. During the rotation of the impurity removal filter cartridge 112, it forms a relative sliding with the cleaning brush plate 116, cleaning the impurities blocking the filter holes in real time, ensuring the continuous transparent operation of the impurity removal filter cartridge, and completing the first-stage centrifugal solid-liquid impurity removal. Subsequently, the solenoid valve on the connecting pipe is opened, and the PTMEG material after the first-stage centrifugal impurity removal is smoothly transported to the fine filtration mechanism 2 through the connecting pipe. After the material is transported to the desired position, the solenoid valve is closed to prevent material turbulence and ensure the stability of subsequent precision filtration operations. The built-in rotating scraping structure of the fine filtration mechanism 2 is used to drive the rotating rod 24 and scraper 25 to rotate continuously through the rotating motor 23. The scraper 25 is always in contact with the end face of the filter plate 22 to continuously scrape and clean, thereby removing the ultrafine suspended micro-impurities trapped on the surface of the filter plate 22 in real time. This performs secondary precision filtration on the PTMEG material and completely removes the residual fine solid impurities in the material. Finally, after the secondary fine filtration operation is completed, the solenoid valve on the feed pipe 10 of the fine filtration mechanism 2 is opened to stably export the purified and impurity-removed high-purity PTMEG material, realizing continuous purification and impurity removal of the material.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for efficiently removing PTMEG impurities, comprising a decontamination mechanism (1) and a fine filtration mechanism (2), characterized in that: The impurity removal mechanism (1) is connected to the fine filtration mechanism (2) via a connecting pipe. A solenoid valve for controlling the flow of material is fixedly installed on the connecting pipe. The impurity removal mechanism (1) includes: The impurity removal assembly (11) includes an impurity removal box (111), an impurity removal filter cartridge (112) is provided in the inner cavity of the impurity removal box (111), an assembly block (113) is fixedly installed at the bottom of the impurity removal filter cartridge (112), a guide rod (114) is slidably passed through the inside of the impurity removal box (111), an installation plate (115) is fixedly installed at one end of the guide rod (114), a cleaning brush plate (116) is detachably connected to the installation plate (115) by bolts and nuts, the side of the brush bristles of the cleaning brush plate (116) is attached to the outer surface of the impurity removal filter cartridge (112), one end of the guide rod (114) extends to the outside of the impurity removal box (111) and is fitted with a return spring (117), one end of the return spring (117) is fixedly connected to the outer wall of the impurity removal box (111), and the other end of the return spring (117) is fixedly installed on the outer side of the end of the guide rod (114); The centrifugal drive assembly (12) is located at the bottom of the impurity removal box (111) and is used to drive the impurity removal filter cartridge (112) to rotate at high speed to realize centrifugal solid-liquid impurity removal operation.

2. The device for efficiently removing PTMEG impurities according to claim 1, characterized by: The centrifugal drive assembly (12) includes a drive motor (121) fixedly installed at the bottom of the impurity removal box (111). The output end of the drive motor (121) extends through into the impurity removal box (111) and is fixedly installed with an assembly shaft plate (122). The top of the assembly shaft plate (122) is provided with an assembly groove (123) that is compatible with the assembly block (113).

3. The device for efficiently removing PTMEG impurities according to claim 2, characterized by: The assembly block (113) is snapped into the assembly groove (123) and is detachably fixed to the assembly shaft plate (122) by a locking screw. A limiting plate (3) is fixedly installed on the outer wall of the impurity removal box (111). A cross groove (4) is opened on the surface of the limiting plate (3). The cross groove (4) is composed of a shallow groove arranged horizontally and a deep groove arranged vertically.

4. The apparatus for efficiently removing PTMEG impurities according to claim 3, characterized in that: A control rod (5) is fixedly installed on the outside of the mounting plate (115). One end of the control rod (5) extends slidably to the outside of the impurity removal box (111) and is fixedly installed with a control plate (6). The control plate (6) can be slidably engaged in the horizontal shallow groove or vertical deep groove of the cross groove (4).

5. The apparatus for efficiently removing PTMEG impurities according to claim 1, characterized in that: The top of the impurity removal box (111) is provided with a top plate (7), and a feed pipe (8) is fixedly connected to the center of the top of the top plate (7). A lifting handle (9) is fixedly installed on the top of the top plate (7).

6. The apparatus for efficiently removing PTMEG impurities according to claim 1, characterized in that: The fine filtration mechanism (2) includes a fine filtration tank (21), a filter plate (22) is fixedly installed on the inner side wall of the fine filtration tank (21), a rotating motor (23) is fixedly installed on the right side of the fine filtration tank (21), the output end of the rotating motor (23) extends rotatably into the fine filtration tank (21), and a rotating rod (24) is fixedly installed thereon. The surface of the rotating rod (24) is rotatably connected to the inside of the filter plate (22), and a scraper (25) is fixedly installed on the surface of the rotating rod (24). The side of the scraper (25) is tightly fitted to the end face of the filter plate (22).

7. The apparatus for efficiently removing PTMEG impurities according to claim 6, characterized in that: A feed pipe (10) is also fixedly installed on the lower right side of the fine filter tank (21), and a solenoid valve for controlling the flow of material is fixedly installed on the feed pipe (10).

8. A purification process for use in the apparatus for efficiently removing PTMEG impurities as described in any one of claims 1-7, characterized in that: Includes the following steps: S1. Material feeding pretreatment: Molten PTMEG coarse material is fed into the impurity removal filter cartridge (112) inside the impurity removal box (111) at a uniform speed to maintain the material in a constant temperature molten state, ensure the material flowability, and provide a basis for subsequent centrifugal impurity removal operations. S2, First-stage centrifugal self-cleaning: The centrifugal drive assembly (12) drives the impurity removal filter cartridge (112) to rotate at high speed. The centrifugal action causes the liquid PTMEG material to quickly penetrate the impurity removal filter cartridge (112). The solid coke residue, gel particles, metal debris and other impurities inside the material are trapped on the inner wall of the impurity removal filter cartridge (112). The guide rod (114) and the reset spring (117) are used in conjunction with the control plate (6) to limit and position the cleaning brush plate (116) so that it always fits the outer surface of the impurity removal filter cartridge (112). During the rotation of the filter cartridge, it forms a relative sliding with the cleaning brush plate (116) to clean the filter holes and block impurities in real time, ensuring that the impurity removal filter cartridge (112) continues to operate with good permeability. S3, Pressure-stabilized conveying and feeding: Open the solenoid valve on the connecting pipe, and the PTMEG material after the first-stage centrifugal impurity removal is steadily conveyed to the fine filtration mechanism (2) through the connecting pipe. After the conveying is completed, close the solenoid valve to avoid material turbulence and ensure the stability of subsequent fine filtration. S4, Secondary dynamic precision filtration: The PTMEG material is subjected to secondary precision filtration through the fine filtration mechanism (2) to completely remove residual fine solid impurities; S5. Clean material discharge: After the secondary fine filtration operation is completed, the purified and impurity-removed high-purity PTMEG material is stably discharged to achieve continuous purification operation.

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