A method for separating recycled polyester from waste polyester raw materials

Abstract

This invention relates to the field of polyester recycling and discloses a method for separating recycled polyester from waste polyester raw materials, comprising the following steps: S1: classifying the recycled polyester and performing preliminary crushing to reduce the volume of each waste material; S2: placing the classified and crushed waste material into a screw conveyor for transportation, initially melting it at high temperature, and then introducing a gas foaming agent into the screw conveyor. Through a long cooling path, micropores are formed on the surface and inside of the waste polyester particles, which are then placed into a production device for further crushing, while adding a portion of liquid solvent; S3: collecting the semi-finished product and placing it in a certain location for temporary storage, while simultaneously cooperating with the solvent reaction and penetration; This invention can greatly increase the reaction area, increase the processing speed, and increase the overall processing speed, while also reducing the use of processing agents, reducing environmental pollution, and lowering processing costs.

Description

Technical Field

[0001] This invention relates to the field of polyester recycling, and more particularly to a method for separating recycled polyester from waste polyester raw materials. Background Technology

[0002] Polyester is a general term for polymers obtained by the condensation polymerization of polyols and polyacids. It mainly refers to polyethylene terephthalate (PET), and conventionally also includes linear thermoplastic resins such as polybutylene terephthalate (PBT) and polyarylates. It is a class of engineering plastics with excellent performance and wide applications.

[0003] With the growing trend of environmentally conscious enterprises, waste generated in polyester production should also be reused to minimize environmental damage and achieve environmentally friendly production. In the current recycling process, waste polyester raw materials are generally ground and crushed, then broken down and sorted before being used for polyester production. However, due to the large size of the waste particles, the reaction time is long and the reaction is incomplete, making the overall process quite troublesome. Summary of the Invention

[0004] To address the technical problem of long processing time, this invention provides a method for separating recycled polyester from waste polyester raw materials.

[0005] This invention is achieved using the following technical solution: a method for separating recycled polyester from waste polyester raw materials, comprising the following steps:

[0006] S1: Sort the recycled polyester and perform preliminary crushing to reduce the volume of each waste.

[0007] S2: The sorted and crushed waste is put into a screw conveyor for transportation. Initially, it is melted at high temperature. Then, a gas foaming agent is introduced into the screw conveyor. Through a long cooling path, micropores are formed on the surface and inside of the waste polyester particles. Then, it is put into the production device for fine crushing, while some liquid solvent is added.

[0008] S3: Collect the semi-finished products and place them in a certain location for temporary storage, while simultaneously cooperating with the reaction and permeation of the solvent;

[0009] S4: Add excess solvent, heat and stir in the reaction vessel to decompose, then squeeze and filter;

[0010] S5: Separate the raw materials from each level and put them into a polycondensation reactor for polycondensation to form different individual products.

[0011] As a further improvement to the above scheme, the solvent is a combination of diethyl ether, xylene, n-butanol, formic acid, m-cresol, triethylene glycol, tetrahydrofuran, 1-ethyl-3-methylimidazolium bromide, trifluoroethanol, hydroquinone, o-dichlorobenzene, cyclohexanone, and cyclopentanone in a certain proportion, with a dissolution temperature of 40-150°C, a reaction time of 1-4 hours, and a pressure of 1-3 atmospheres.

[0012] As a further improvement to the above solution, the production apparatus includes:

[0013] The production box has a collection box fixedly connected to one side; the receiving mechanism is located at the bottom of the production box, and a crushing mechanism located inside the production box is set above it to perform crushing; the cutting and guiding mechanism is located above the crushing mechanism and is connected to the production box to perform crushing and guiding mechanism; the feeding mechanism is fixedly connected to the collection box, and its output end is connected to the crushing and guiding mechanism.

[0014] As a further improvement to the above solution, the crushing and diversion mechanism includes:

[0015] A guide box is fixedly connected to the top of the production box, with a top shaft rotatably connected in the middle; multiple cutting shafts are rotatably sleeved on the top shaft, and one end is sleeved with a gear. The outer wall of the gear meshes with a gear ring fixedly connected to the production box. In actual use, the cutting shaft is equipped with a heating device for easy cleaning later. The cutting shaft is equipped with cutting blades for impact crushing while cutting; multiple ventilation units are connected to the cutting shaft; a separation box is fixedly connected to the production box, with multiple leakage pipes connected to it. One side of each leakage pipe is connected to an auxiliary pipe rotatably connected to the top shaft; a transmission box is fixedly connected to the separation box and is connected to the auxiliary pipes via a gear set. The transmission shaft is connected to the crushing mechanism. The transmission box and transmission components are existing devices, consisting of a combination of gears, etc., and the transmission mechanism is a combination of existing mechanisms such as worm gears.

[0016] As a further improvement to the above solution, the crushing mechanism includes:

[0017] The friction sleeve is fixedly connected to the production box; the impact sleeve is set on the friction sleeve, and an intermediate shaft that is rotatably connected to the transmission box is fixedly sleeved in the middle; multiple cutting blades are set and fixedly connected to the intermediate shaft; the auxiliary unit is connected to the intermediate shaft and the impact sleeve; and the screening hole is set through the impact sleeve.

[0018] As a further improvement to the above solution, the auxiliary unit includes:

[0019] A transmission device is connected to an intermediate shaft via gears. A transmission assembly is connected to one side of the transmission device, and a protective box fixedly connected to the production box is provided on the outside of the transmission assembly. A rotating block is rotatably connected to the protective box, and a rotating cylinder is fixedly connected in the middle of it. A second spring is fixedly connected inside the rotating cylinder, and the other end of the second spring is fixedly connected to a vibrating rod that is slidably sleeved on the rotating cylinder. An impact block is rotatably connected to the vibrating rod and is fitted with an impact groove located on the impact sleeve. A guide channel is located inside the impact sleeve, one end of which is connected to the impact groove, and the other end is connected to a discharge channel located inside the impact sleeve.

[0020] As a further improvement to the above solution, the receiving mechanism includes:

[0021] A guide box is fixedly connected inside the production box, and its center is rotatably connected to an intermediate shaft; a discharge pipe is fixedly connected to the guide box, and a valve is connected to it; a sliding sleeve is rotatably connected to the guide box, and a second spring is fixedly connected in the middle, with the other end of the second spring fixedly connected to the intermediate shaft, and the sliding sleeve is slidably sleeved with the intermediate shaft; an arc-shaped block is fixedly connected inside the guide box, and a lifting rod fixedly connected to the guide box is provided above it, with a third spring fixedly connected inside the lifting rod, and the other end of the third spring fixedly connected to a trigger rod that is slidably connected to the arc-shaped block; a feed pump is fixedly connected to the bottom of the production box, and its output end is connected to a feed pipe located inside the collection box.

[0022] As a further improvement to the above solution, the feeding mechanism includes a bolt conveyor fixedly connected to the receiving box, a plurality of adding pipes fixedly connected to the outer wall of the screw conveyor, a main pipe fixedly connected to the other end of the adding pipes, and a feeding funnel fixedly connected to the bottom of the screw conveyor.

[0023] As a further improvement to the above solution, the ventilation unit includes a guide tube fixedly connected to the cutting shaft, a limiting frame fixedly connected inside the guide tube, a blocking ball connected to one side of the limiting frame via an elastic component, a filter block fixedly connected inside the guide tube, and a replacement cover threaded onto one end of the guide tube, with multiple overflow tubes threaded onto the replacement cover.

[0024] As a further improvement to the above solution, a drive assembly is connected to one side of the sliding sleeve, a discharge pipe is connected to one side of the collection box, and an additive pipe is connected to one side of the production box.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. By puffing and refining the raw materials, the reaction area can be greatly increased, the processing speed can be increased, and the overall processing speed can be increased. At the same time, the use of processing agents can be reduced, environmental pollution can be reduced, and processing costs can be reduced.

[0027] 2. Through the production equipment, puffing can be stably processed and grinding can be carried out simultaneously, which can achieve stable production, while reducing the use of the overall equipment and reducing equipment occupation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the front sectional view of the present invention;

[0030] Figure 3 This is a schematic diagram of the left cross-section of the present invention;

[0031] Figure 4 This is an enlarged structural diagram of point A;

[0032] Figure 5 This is a schematic diagram of the left cross-section of the ventilation unit;

[0033] Figure 6 This is an enlarged structural diagram of point B;

[0034] Figure 7 This is an enlarged structural diagram of point C.

[0035] Explanation of key symbols:

[0036] 1. Production box; 2. Arc-shaped block; 3. First spring; 4. Feed pipe; 5. Intermediate shaft; 6. Sliding sleeve; 7. Drive assembly; 8. Feed pump; 9. Collection box; 10. Arc-shaped block; 11. Trigger rod; 12. Feed pipe; 13. Friction sleeve; 14. Screening hole; 15. Transmission device; 16. Cutting blade; 17. Transmission box; 18. Discharge pipe; 19. Feed hopper; 20. Screw conveyor; 21. Main pipe; 22. Screw conveyor; 23. Guide box; 24. Top shaft; 25. 26. Gear ring; 27. Separation box; 28. Impact sleeve; 29. ​​Guide box; 30. Overflow pipe; 31. Filter block; 32. Filter block; 33. Blocking ball; 34. Limiting frame; 35. Auxiliary pipe; 36. Leakage pipe; 37. Rotating block; 38. Transmission assembly; 39. First spring; 40. Rotating cylinder; 41. Vibrating rod; 42. Impact block; 43. Guide channel; 44. Discharge channel; 45. Protective box; 46. Gear; 47. Cutting shaft; 48. Ventilation unit; 49. Guide pipe. Detailed Implementation

[0037] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0038] Example 1:

[0039] Please combine Figure 1-7 The implementation principle of a method for separating recycled polyester from waste polyester raw materials in this application embodiment is as follows:

[0040] A method for separating recycled polyester from waste polyester raw materials includes the following steps:

[0041] S1: The recycled polyester is sorted and initially crushed to reduce the volume of each waste material. The initial crushing is carried out using a crusher to facilitate subsequent processing.

[0042] S2: The sorted and crushed waste is placed into a screw conveyor for transportation. Initially, it is melted at high temperature, and then a gaseous foaming agent is introduced into the screw conveyor. It undergoes preliminary cooling through a long path, which causes micropores to form on the surface and inside of the waste polyester particles. Then, it is placed into the production device for fine crushing. At the same time, some liquid solvent is added. It is heated and melted during transportation, and then a certain amount of foaming agent is added. This can save some time, ensure mixing, and improve the subsequent effect.

[0043] S3: Collect the semi-finished products and place them in a certain location for temporary storage. At the same time, in conjunction with the reaction and permeation of the solvent, the collection and storage can adapt to different reaction times and ensure the continuity of work.

[0044] S4: Add an excess of solvent, heat and stir in the reactor to decompose, then squeeze and filter. After dissolution and filtration, the work needs are further met.

[0045] S5: Separate the raw materials at each level and put them into a polycondensation kettle for polycondensation to form different individual products. Collect the finished products and store them.

[0046] The solvent is a combination of diethyl ether, xylene, n-butanol, formic acid, m-cresol, triethylene glycol, tetrahydrofuran, 1-ethyl-3-methylimidazolium bromide, trifluoroethanol, hydroquinone, o-dichlorobenzene, cyclohexanone, and cyclopentanone in a certain proportion. The dissolution temperature is 40–150℃, the reaction time is 1–4 hours, and the pressure is 1–3 atmospheres.

[0047] The production equipment includes:

[0048] The production box 1 has a collection box 9 fixedly connected to one side. The production box 1 is protected and limited to ensure the stability of the operation. At the same time, the collection box 9 collects the materials and achieves temporary storage.

[0049] The receiving mechanism is located at the bottom of the production box 1, and above it is a crushing mechanism located inside the production box 1. The crushing mechanism crushes the raw materials, and the receiving mechanism performs the final processing. At the same time, it transports the raw materials as necessary, realizing the receiving and transfer of materials.

[0050] The cutting and guiding mechanism is located above the crushing mechanism and is connected to the production box 1. The crushing and guiding mechanism performs necessary cutting and guides the gas flow to achieve the necessary work.

[0051] The feeding mechanism is fixedly connected to the collection box 9, and its output end is connected to the crushing and diversion mechanism. The feeding mechanism performs necessary feeding and assists in melting and solidification.

[0052] The crushing and drainage mechanism includes:

[0053] The guide box 23 is fixedly connected to the top of the production box 1, and the top shaft 24 is rotatably connected in the middle. The guide box 23 provides necessary guidance so that the raw materials transported by the feeding mechanism fall evenly through the internal plate, ensuring the stability of subsequent cutting.

[0054] The cutting shaft 46 is rotatably sleeved on the top shaft 24. Multiple cutting shafts are provided, and one end is sleeved with a gear 45. The outer wall of the gear 45 is meshed with a gear ring 25 fixedly connected to the production box 1. The cutting shaft 46 can rotate with the top shaft 24, and at the same time, under the drive of the gear ring 25, the gear 45 rotates, forming the self-rotation of the cutting shaft 46.

[0055] Multiple venting units 47 are provided and connected to the cutting shaft 46. The venting units 47 provide necessary ventilation to quickly cut the liquid being dissolved. At the same time, the gas expansion makes the liquid more porous, ensuring the surface area for subsequent reactions.

[0056] Separation box 26 is fixedly connected to production box 1. Multiple leakage pipes 35 are connected to it. One side of the leakage pipe 35 is connected to an auxiliary pipe 34 that is rotatably connected to the top shaft 24. Separation box 26 separates the upper and lower spaces. Then, under the action of gravity, the semi-fluid raw material is guided from the leakage pipe 35 and moves downward. The auxiliary pipe 34 is connected to the outside world and can be circulated with gas for cooling and expansion.

[0057] The transmission box 17 is fixedly connected to the separation box 26 and is connected to the auxiliary pipe 34 through a gear set. The transmission shaft 17 is connected to the crushing mechanism. The transmission box 17 realizes the transmission of torque and adapts to the displacement of the intermediate shaft 5 moving up and down.

[0058] The crushing mechanism includes:

[0059] Friction sleeve 13 is fixedly connected to production box 1. Friction sleeve 13, in conjunction with the impact sleeve 27, crushes raw materials by impact and rotation.

[0060] Impact sleeve 27 is mounted on friction sleeve 13, with intermediate shaft 5 fixedly connected to transmission box 17 in the middle. Impact sleeve 27 rotates with intermediate shaft 5 to achieve grinding.

[0061] Multiple cutting blades 16 are provided and are fixedly connected to the intermediate shaft 5. The cutting blades 16 perform preliminary auxiliary cutting as the intermediate shaft 16 rotates.

[0062] The auxiliary unit is connected to the intermediate shaft 5 and the impact sleeve 27, and performs auxiliary crushing.

[0063] The screening hole 14 is provided through the impact sleeve 27. The screening hole 14 can directly drop the powder that meets the requirements, thereby speeding up the grinding speed.

[0064] The auxiliary unit includes:

[0065] The transmission device 15 is connected to the intermediate shaft 5 via gears. A transmission assembly 37 is connected to one side of the transmission device 15. A protective box 44, which is fixedly connected to the production box 1, is provided on the outside of the transmission assembly 37. The transmission device 15 adapts to certain displacement requirements and transmits torque through the transmission assembly 37. The protective box 44 provides necessary protection.

[0066] The rotating block 36 is rotatably connected to the protective box 44, and a rotating cylinder 39 is fixedly connected in the middle of it. A second spring 38 is fixedly connected inside the rotating cylinder 39, and the other end of the second spring 38 is fixedly connected to the vibrating rod 40 that is slidably sleeved on the rotating cylinder 39. The rotating block 36 rotates along with the transmission component 37, and at the same time, the second spring 38 adapts to a certain displacement and return to position of the vibrating rod 40. The vibrating rod 40 rotates along with the rotation of the transmission block 36.

[0067] Impact block 41 is rotatably connected to vibrating rod 40 and is connected to impact groove on impact sleeve 27. Impact block 41 rotates and moves in coordination with impact sleeve 27 to impact each other and perform small-scale auxiliary grinding and crushing.

[0068] The guide channel 42 is set inside the impact sleeve 27. One end of it is connected to the impact groove, and the other end is connected to the unloading channel 43 located inside the impact sleeve 27. The crushed raw material enters the unloading channel 43 through the guide channel 42, and then enters the friction sleeve 13 for subsequent work.

[0069] The receiving mechanism includes:

[0070] The guide box 28 is fixedly connected inside the production box 1, and is rotatably connected to the intermediate shaft 5 in the middle. After being guided by the guide box 28, the final powder enters the discharge pipe 4 and then moves downward.

[0071] The material leakage pipe 4 is fixedly connected to the guide box 28 and connected to the valve;

[0072] The sliding sleeve 6 is rotatably connected to the guide box 28, and a second spring 3 is fixedly connected in the middle of it. The other end of the second spring 3 is fixedly connected to the intermediate shaft 5. The sliding sleeve 6 is slidably sleeved with the intermediate shaft 5. When the sliding sleeve 6 rotates as necessary, it drives the intermediate shaft 5 to rotate, and at the same time, it causes the second spring 3 to store energy so that it returns to its original position when not in use.

[0073] The arc-shaped block 10 is fixedly connected inside the guide box 28. A lifting rod 2 is fixedly connected above the arc-shaped block 10 and is fixedly connected to the guide box 28. A third spring is fixedly connected inside the lifting rod 2, and the other end of the third spring is fixedly connected to a trigger rod 11 that is slidably connected to the arc-shaped block 10. The arc-shaped block 10 lifts the trigger rod 11, which further causes the lifting rod 2 to move upward, and further causes the intermediate shaft 5 to move up and down, thus creating displacement.

[0074] The feed pump 8 is fixedly connected to the bottom of the production box 1, and its output end is connected to the feed pipe 12 located in the collection box 9. The feed pump 8 performs forced transport of powder, so that the powder enters the collection box 9 through the feed pipe 12.

[0075] The feeding mechanism includes a bolt conveyor 20 fixedly connected to the receiving box 9. Multiple adding pipes 22 are fixedly connected to the outer wall of the screw conveyor 20. The other end of the adding pipe 22 is fixedly connected to the main pipe 21. The bottom of the screw conveyor 20 is fixedly connected to the feeding funnel 19. The raw material is moved upward by the forced transport of the screw conveyor 20. At the same time, during the movement, the necessary raw material is added to the inside through the adding pipes 22. The raw material is heated and melted by the external auxiliary mechanism for subsequent transport.

[0076] The ventilation unit 47 includes a guide tube 48 fixedly connected to the cutting shaft 46. A limiting frame 33 is fixedly connected inside the guide tube 48. A blocking ball 32 is connected to one side of the limiting frame 33 through an elastic component. A filter block 31 is fixedly connected inside the guide tube 48. A replacement cover 30 is threaded onto one end of the guide tube 48. Multiple overflow pipes 29 are threaded onto the replacement cover 30. External gas is transmitted and then ejected through the limiting frame 33, the filter block 31, and the overflow pipes 29 to add impact. At the same time, the blocking ball 32, in conjunction with the elastic component, makes the flow unidirectional.

[0077] A drive assembly 7 is connected to one side of the sliding sleeve 6, a discharge pipe 18 is connected to one side of the collection box 9, and an additive pipe is connected to one side of the production box 1. The drive assembly 7 provides torque, while the discharge pipe 18 discharges the finished product and the additive pipe adds the necessary raw materials.

[0078] During operation, the crushed raw materials are placed into the feed hopper 19 and then transported upwards by the screw conveyor 20. During the transport process, friction and external heating melt the raw materials. At the same time, necessary additives can be added through the main pipe 21 and the screw conveyor 22. After mixing, the mixture enters the guide box 23 and then drips into the production box 1. During the dripping process, the top shaft 24 drives the cutting shaft 46 to rotate. Simultaneously, with the constraint of the gear ring 25, the cutting shaft 46 rotates, achieving omnidirectional cutting. Gas expansion agent is introduced into the top shaft 24. Initially, it enters the liquid raw materials through the top shaft 24, and then the gas simultaneously enters the guide pipe 48 through the top shaft 24. After passing through the limiting frame 33, the filter block 31, and the overflow pipe 29, it overflows and is then added. Meanwhile, the low-temperature gas causes the liquid surface to solidify, forming microparticle-like porous powder. This powder falls downwards through the overflow pipe 35 and is simultaneously cooled by the introduction of expanded gas through the auxiliary pipe 34. Under the influence of gravity and the vibration of the overall operation, small particles fall and are then cut and impacted by the cutting blade 16, resulting in crushing. The solid raw material falls onto the friction sleeve 13, where it is impacted and ground by the impact sleeve 27, forming tiny porous powder particles. These particles fall into the guide box 28 through the leakage pipe 4 and are then sucked into the collection box 9 by the feed pump 8 for storage, achieving stable and temporary collection. Simultaneously, during the grinding process of the impact sleeve 27, the impact block 41 rotates due to the drive of the transmission device 15 and the transmission component 37, performing auxiliary impact grinding on the surface and increasing the overall work progress.

[0079] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A method for separating and obtaining a regenerated polyester from a waste polyester raw material, characterized by, It comprises the following steps: S1: the recycling classified polyester is classified, and primary crushing is carried out to reduce the volume of single waste; S2: the classified and crushed waste is put into a screw conveyor for transportation, initial high-temperature melting is carried out, then a gas blowing agent is introduced into the screw conveyor, micro-holes are formed on the surface and inside of the waste polyester particles through long-path cooling, and then the waste polyester particles are put into a production device for fine crushing while part of a liquid dissolving agent is added; S3: the semi-finished product is collected and placed in a certain position for temporary storage while cooperating with the reaction penetration of the dissolving agent; S4: an excess amount of the dissolving agent is added, and the reaction kettle is heated and stirred for decomposition, and then extrusion filtration is carried out; S5: the raw materials of various levels are separated and put into a polycondensation kettle for polycondensation to form different single products; The production device comprises: a production box, one side of which is fixedly connected with a collecting box; a material collecting mechanism located at the bottom of the production box, above which a crushing mechanism located in the production box is arranged to crush; a cutting and draining mechanism located above the crushing mechanism and connected with the production box to crush and drain; a feeding mechanism fixedly connected with the collecting box and having an output end connected with the crushing and draining mechanism; the crushing and draining mechanism comprises: a guide box fixedly connected at the top end of the production box, a top shaft rotatably connected in the middle of the guide box; a plurality of cutting shafts rotatably sleeved on the top shaft, one end of each cutting shaft being sleeved with a gear, and the outer wall of the gear being meshedly connected with a gear ring fixedly connected with the production box; a plurality of air permeation units connected with the cutting shafts; a separation box fixedly connected with the production box, a plurality of liquid leakage pipes being connected to the separation box, one side of each liquid leakage pipe being connected with an auxiliary pipe rotatably connected with the top shaft; a transmission box fixedly connected with the separation box and transmissionally connected with the auxiliary pipe through a gear set, and the transmission box being transmissionally connected with the crushing mechanism; the crushing mechanism comprises: a friction sleeve fixedly connected with the production box; an impact sleeve provided on the friction sleeve, an intermediate shaft rotatably sleeved in the middle of the impact sleeve and transmissionally connected with the transmission box; a plurality of cutting blades fixedly connected with the intermediate shaft; an auxiliary unit connected with the intermediate shaft and the impact sleeve; a screening hole penetratingly provided in the impact sleeve; the auxiliary unit comprises: a transmission device transmissionally connected with the intermediate shaft through a gear, one side of the transmission device being transmissionally connected with a transmission assembly, and the outer side of the transmission assembly being provided with a protection box fixedly connected with the production box; a rotating block rotatably connected with the protection box and having a rotating cylinder fixedly connected in the middle of the rotating block, a second spring fixedly connected in the rotating cylinder, and a vibrating rod fixedly sleeved with the rotating cylinder and connected with the other end of the second spring; an impact block rotatably connected with the vibrating rod and cooperatively connected with an impact groove provided on the impact sleeve; a guide channel provided in the impact sleeve, one end of the guide channel being in communication with the impact groove, and the other end of the guide channel being in communication with a discharging channel provided in the impact sleeve.

2. A method of separating and recovering a recycled polyester from a waste polyester raw material according to claim 1, characterized by, The dissolving agent is a combination of ethyl ether, dimethylbenzene, n-butanol, formic acid, m-cresol, triethylene glycol, tetrahydrofuran, 1-ethyl-3-methylimidazole bromide, trifluoroethanol, hydroquinone, o-dichlorobenzene, cyclohexanone and cyclopentanone in proportion, the dissolving temperature is 40-150°C, the reaction time is 1-4H, and the pressure is 1-3 atmospheres.

3. A method of separating and recovering a recycled polyester from a waste polyester raw material according to claim 1, characterized by, The material collecting mechanism comprises a production box, a guiding box fixedly connected in the production box, a middle shaft rotatably connected to the middle of the guiding box, a material leakage pipe fixedly connected to the guiding box and connected with a valve, a sliding sleeve rotatably connected to the guiding box and fixedly connected with a second spring at the middle thereof, the other end of the second spring being fixedly connected with the middle shaft, an arc-shaped block fixedly connected in the guiding box and provided with a jacking rod fixedly connected with the guiding box at the top thereof, the jacking rod being fixedly connected with a third spring at the inside thereof, the other end of the third spring being fixedly connected with a trigger rod rollingly connected with the arc-shaped block, and a material conveying pump fixedly connected to the bottom of the production box and connected with a material conveying pipe in the collecting box. The material collecting mechanism comprises a production box, a guiding box fixedly connected in the production box, a middle shaft rotatably connected to the middle of the guiding box, a material leakage pipe fixedly connected to the guiding box and connected with a valve, a sliding sleeve rotatably connected to the guiding box and fixedly connected with a second spring at the middle thereof, the other end of the second spring being fixedly connected with the middle shaft, an arc-shaped block fixedly connected in the guiding box and provided with a jacking rod fixedly connected with the guiding box at the top thereof, the jacking rod being fixedly connected with a third spring at the inside thereof, the other end of the third spring being fixedly connected with a trigger rod rollingly connected with the arc-shaped block, and a material conveying pump fixedly connected to the bottom of the production box and connected with a material conveying pipe in the collecting box. The air permeating unit comprises a guiding pipe fixedly connected with the cutting shaft, a limiting frame fixedly connected in the guiding pipe, a blocking ball connected with one side of the limiting frame through an elastic component, a filter block fixedly connected in the guiding pipe, a replacement cover threadedly sleeved at one end of the guiding pipe, and a plurality of overflow pipes threadedly sleeved on the replacement cover. One side of the sliding sleeve is drivingly connected with a driving component, one side of the collecting box is connected with a discharge pipe, and one side of the production box is connected with an additive pipe. ​ ​ 4. The method for separating recycled polyester from waste polyester raw materials as described in claim 1, characterized in that, ​ 5. The method for separating recycled polyester from waste polyester raw materials as described in claim 1, characterized in that, ​ 6. A method of separating and recovering a regenerated polyester from a waste polyester raw material according to claim 3, characterized by, ​

Images