Catalytic device and method for bio-based polyester PTT

Abstract

The invention discloses a catalytic device and method for bio-based polyester PTT, and relates to the field of catalysis of bio-based polyester PTT. The catalytic device comprises a slurry preparation kettle, a stirring kettle, a first reactor and a second reactor, a vibration screening assembly is arranged on one side of the top of the slurry preparation kettle, an ion exchange resin column is arranged on the other side of the top of the slurry preparation kettle, and the first reactor and the second reactor are arranged in the slurry preparation kettle. A molecular sieve dehydrating tower is mounted at the top of the ion exchange resin column, a rotating shaft is rotationally connected into an inner cavity of the slurry preparation kettle, a second stirring rod is mounted on the outer wall of the rotating shaft, a scraper is mounted on the outer wall of the second stirring rod, an auxiliary stirring rod is arranged on the side edge of the second stirring rod, and a baffle plate is mounted in the center of an inner cavity of the stirring kettle. The top and the bottom of the inner cavity of the stirring kettle are rotationally connected with first stirring rods. According to the catalysis device and method for the bio-based polyester PTT, the device can be used for treating raw materials for multiple times before catalysis, so that the precision of a finished product can be improved.

Description

Technical Field

[0001] The present invention relates to the catalytic field of bio-based polyester PTT, and particularly to a catalytic device and method for bio-based polyester PTT. Background Art

[0002] Bio-based polyester is a polyester material synthesized from renewable biomass. Its chemical structure is formed by terephthalic acid and bio-based 1,3-propanediol through esterification and polycondensation reactions. Compared with traditional petroleum-based PTT, the 1,3-PDO in bio-based PTT is derived from biomass, which has significant environmental protection and sustainable development.

[0003] When catalyzing bio-based polyester PTT, the raw materials cannot be fully pretreated, resulting in the accuracy of the final product being affected and the qualification rate of the product not being guaranteed.

[0004] Therefore, it is necessary to propose a catalytic device and method for bio-based polyester PTT to solve the above problems. Summary of the Invention

[0005] The main purpose of the present invention is to provide a catalytic device and method for bio-based polyester PTT, which can effectively solve the problems in the background art.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A catalytic device for bio-based polyester PTT includes a slurry preparation kettle, a stirring kettle, a first reactor, and a second reactor. One side of the top of the slurry preparation kettle is provided with a vibration screening assembly, and the other side of the top of the slurry preparation kettle is provided with an ion exchange resin column. A molecular sieve dehydration tower is installed on the top of the ion exchange resin column; A rotating shaft is rotatably connected to the inner cavity of the slurry preparation kettle. A second stirring rod is installed on the outer wall of the rotating shaft, a scraping plate is installed on the outer wall of the second stirring rod, an auxiliary stirring rod is arranged on the side of the second stirring rod, a baffle plate is installed in the middle of the inner cavity of the stirring kettle, first stirring rods are rotatably connected to the top and bottom of the inner cavity of the stirring kettle, and a driving assembly is installed on the top of the stirring kettle; A static mixer is installed in the inner cavity of the first reactor, and an ultrasonic vibration rod is installed in the inner cavity of the second reactor.

[0007] Preferably, the vibration screening assembly is a cavity structure with the top and bottom communicating with the outside. A through groove is provided on the side of the inner cavity of the vibration screening assembly. Activity grooves are symmetrically provided at both ends of the inner cavity of the vibration screening assembly. A guide rod is installed in the inner cavity of the activity groove. A first servo motor is installed on the side of the vibration screening assembly. A striking rod is installed at the bottom of the first servo motor through a first rotating shaft. The striking rod is movably connected in the inner cavity of the through groove.

[0008] Preferably, movable blocks are symmetrically installed at the centers of both ends of the screening box. The movable blocks are movably connected to the inner cavity of the activity groove and sleeved on the outer wall of the guide rod. Springs are symmetrically installed on both sides of the movable blocks. The springs are wound around the outer wall of the guide rod. The other ends of the springs are installed in the inner cavity of the activity groove. A blanking device is installed at the bottom of the screening box. The blanking device is installed on the top of the slurry preparation kettle and communicates with its inner cavity. The inner cavities of the molecular sieve dehydration tower, the ion exchange resin column, and the slurry preparation kettle communicate with each other.

[0009] Preferably, a spray ring pipe is installed at the bottom of the inner cavity of the slurry preparation kettle. A dilution tank is installed at the bottom of the outer wall of the slurry preparation kettle. The dilution tank communicates with the inner cavity of the spray ring pipe. A gear ring is connected to the top of the inner cavity of the slurry preparation kettle. A gear meshes with the side of the gear ring. The gear is rotatably connected to the top of the inner cavity of the slurry preparation kettle.

[0010] Preferably, the rotating shaft is installed at the center of the bottom of the gear ring. The scraping plate is attached to the inner wall of the slurry preparation kettle. A main gear is installed at the bottom of the rotating shaft. A sub-gear is installed at the bottom of the auxiliary stirring rod. The main gear meshes with the sub-gear. The sub-gear is rotatably connected to the outer ring of the main gear. The top of the auxiliary stirring rod is rotatably connected to the bottom of the gear ring.

[0011] Preferably, a second servo motor is installed on the top of the driving assembly. A belt is installed in the inner cavity of the driving assembly. Belt pulleys are installed on both sides of the inner cavity of the belt. The bottom of the second servo motor is installed on the top of one of the belt pulleys through a first rotating shaft. One of the belt pulleys is installed on the top of the gear. The other belt pulley is installed on the top of the first stirring rod.

[0012] Preferably, the opposite sides of the two first stirring rods are rotatably connected to the center of the inner cavity of the baffle plate. Electric heating wires are installed on the inner wall of the baffle plate. A screw conveyor is installed at the top of the side of the stirring kettle. The bottom of the screw conveyor is installed at the bottom of the outer wall of the slurry preparation kettle.

[0013] Preferably, a delivery pipe is installed at the bottom of the outer wall of the stirring kettle. The delivery pipe is connected to the first reactor. Feed pipes are installed at the tops of the first reactor and the second reactor. A discharge pipe is installed on the outer wall of the second reactor.

[0014] Preferably, the inner cavities of the first reactor and the second reactor are connected by a pipeline.

[0015] A catalytic method for a bio-based polyester PTT, comprising the following operating steps: S1: Inject propylene glycol into the inner cavity of the slurry preparation kettle after being treated by a molecular sieve dehydration tower and an ion exchange resin column; S2: Inject terephthalic acid into the inner cavity of the screening box, start the first servo motor to drive the impact rod to rotate. When the impact rod rotates, it will contact the screening box through the impact rod, thereby driving the screening box to move. At this time, the screening box can screen terephthalic acid. The qualified terephthalic acid is input into the inner cavity of the slurry preparation kettle through the feeder. After the screening box is vibrated, it will drive the movable block to move in the inner cavity of the movable groove and on the outer wall of the guide rod, and at the same time, it will compress the spring. At this time, the spring can increase the vibration amplitude of the screening box through the movable block; S3: Start the second servo motor to drive the belt and pulley. One pulley drives the gear to rotate. At this time, the gear meshes with the gear ring. Based on this, the second stirring rod and the scraper are driven to rotate through the rotating shaft. The second stirring rod stirs the materials entering its inner cavity. The scraper prevents the materials from sticking and accumulating on the inner wall of the slurry preparation kettle. The gear ring drives the auxiliary stirring rod to rotate in a circular motion. When the rotating shaft rotates, it will drive the main gear to rotate. After the main gear meshes with the sub-gear, it can drive the auxiliary stirring rod to rotate self-rotatingly. Based on this, the efficiency of material mixing is improved. Place the catalyst in the inner cavity of the dilution box, and input the catalyst into the inner cavity of the slurry preparation kettle through the injection ring pipe for mixing together. After mixing is completed, start the screw conveyor to input the materials into the inner cavity of the stirring kettle; S4: Another pulley drives the first stirring rod to rotate. The first stirring rod can stir the materials entering its inner cavity, cooperate with the baffle plate to strengthen the mixing of the materials, and at the same time start the electric heating wire to heat the internal materials until the reaction is completed and the propylene glycol terephthalate monomer is generated; S5: Input the propylene glycol terephthalate monomer into the inner cavity of the first reactor through the conveying pipe, input the matting agent into the inner cavity of the first reactor, mix it through the static mixer. After mixing is completed, input the materials in the inner cavity of the first reactor into the inner cavity of the second reactor, input the heat stabilizer into the inner cavity of the second reactor, and carry out the reaction through the ultrasonic vibration rod. After the reaction is completed, the catalytic treatment can be completed and discharged through the discharge pipe.

[0016] Compared with the prior art, the present invention provides a catalytic device and method for a bio-based polyester PTT, having the following beneficial effects: The catalytic device and method for the bio-based polyester PTT can dehydrate and purify propylene glycol through the molecular sieve dehydration tower and ion exchange resin column provided, and can screen terephthalic acid through the vibration screening assembly provided. Based on this, the used raw materials for catalysis can be finely processed, and the precision of the finished product after catalysis can be effectively improved.

[0017] The catalytic device and method for the bio-based polyester PTT can drive the pulley and belt by starting the second servo motor provided, so that the pulley can drive the gear and the first stirring rod to rotate. The gear can be engaged with the gear ring, so that the gear ring can drive the second stirring rod and the scraper to rotate through the rotating shaft, and at the same time can also drive the main gear to be engaged with the sub-gear, so that the auxiliary stirring rod can also rotate. Based on this, the efficiency of material mixing can be improved.

[0018] The catalytic device and method for the bio-based polyester PTT can heat the stirring kettle through the electric heating wire provided, and can further improve the material mixing efficiency in cooperation with the first stirring rod and the baffle provided.

[0019] The catalytic device and method for the bio-based polyester PTT can further react the materials through the static mixer and the ultrasonic vibration rod through the first reactor and the second reactor provided until the catalysis is completed. Description of the Drawings

[0020] Figure 1 is the structural schematic diagram of the whole invention; Figure 2 is the structural schematic diagram of the vibration screening assembly of the invention; Figure 3 is the structural schematic diagram of the inner cavity of the slurry preparation kettle of the invention; Figure 4 is the structural schematic diagram of the inner cavity of the stirring kettle of the invention; Figure 5 is the structural schematic diagram of the first reactor of the invention.

[0021] In the figure: 1. Slurry preparation kettle; 2. Stirring kettle; 3. First reactor; 4. Second reactor; 5. Vibration screening assembly; 6. First servo motor; 7. Impact rod; 8. Through groove; 9. Movable groove; 10. Guide rod; 11. Screening box; 12. Movable block; 13. Spring; 14. Feeder; 15. Molecular sieve dehydration tower; 16. Ion exchange resin column; 17. Dilution box; 18. Spray loop pipe; 19. Main gear; 20. Sub-gear; 21. Auxiliary stirring rod; 22. Gear; 23. Gear ring; 24. Scraper; 25. Driving assembly; 26. Second servo motor; 27. Belt; 28. Pulley; 29. Baffle plate; 30. Electric heating wire; 31. First stirring rod; 32. Delivery pipe; 33. Feeding pipe; 34. Discharge pipe; 35. Static mixer; 36. Ultrasonic vibration rod; 37. Rotating shaft; 38. Second stirring rod; 39. Screw conveyor. Detailed implementation manners

[0022] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners. Example 1:

[0023] As Figure 1 shown in the figure, a catalytic device for bio-based polyester PTT includes a slurry preparation kettle 1, a stirring kettle 2, a first reactor 3, and a second reactor 4. On one side of the top of the slurry preparation kettle 1, a vibration screening assembly 5 is provided. On the other side of the top of the slurry preparation kettle 1, an ion exchange resin column 16 is provided. On the top of the ion exchange resin column 16, a molecular sieve dehydration tower 15 is installed. The vibration screening assembly 5 is a cavity structure with the top and bottom communicating with the outside. A through groove 8 is opened on the side of the inner cavity of the vibration screening assembly 5. Movable grooves 9 are symmetrically opened at both ends of the inner cavity of the vibration screening assembly 5. Guide rods 10 are installed in the inner cavities of the movable grooves 9. A first servo motor 6 is installed on the side of the vibration screening assembly 5. At the bottom of the first servo motor 6, an impact rod 7 is installed through a first rotating shaft. The impact rod 7 is movably connected in the inner cavity of the through groove 8. Movable blocks 12 are symmetrically installed at the midpoints of both ends of the screening box 11. The movable blocks 12 are movably connected in the inner cavity of the movable groove 9 and sleeved on the outer wall of the guide rod 10. Springs 13 are symmetrically installed on both sides of the movable blocks 12. The springs 13 are wound around the outer wall of the guide rod 10. The other ends of the springs 13 are installed in the inner cavities of the movable grooves 9. A feeder 14 is installed at the bottom of the screening box 11. The feeder 14 is installed on the top of the slurry preparation kettle 1 and communicates with its inner cavity. The inner cavities of the molecular sieve dehydration tower 15, the ion exchange resin column 16, and the slurry preparation kettle 1 communicate with each other; Through the provided molecular sieve dehydration tower 15 and ion exchange resin column 16, propylene glycol can be dehydrated and purified. Through the provided vibration screening assembly 5, terephthalic acid can be screened. Based on this, the used raw materials for catalysis can be finely processed, effectively improving the precision of the finished product after catalysis. Example 2:

[0024] As Figure 1 shown in the figure, a catalytic device for bio-based polyester PTT. A rotating shaft 37 is rotatably connected in the inner cavity of the slurry preparation kettle 1. A second stirring rod 38 is installed on the outer wall of the rotating shaft 37. A scraping plate 24 is installed on the outer wall of the second stirring rod 38. An auxiliary stirring rod 21 is arranged on the side of the second stirring rod 38. A baffle plate 29 is installed in the center of the inner cavity of the stirring kettle 2. First stirring rods 31 are rotatably connected to both the top and bottom of the inner cavity of the stirring kettle 2. A driving assembly 25 is installed on the top of the stirring kettle 2. A spray ring pipe 18 is installed at the bottom of the inner cavity of the slurry preparation kettle 1. A dilution tank 17 is installed at the bottom of the outer wall of the slurry preparation kettle 1. The dilution tank 17 communicates with the inner cavity of the spray ring pipe 18. The top of the inner cavity of the slurry preparation kettle 1 is connected with a gear ring 23. A gear 22 meshes with the side of the gear ring 23. The gear 22 is rotatably connected to the top of the inner cavity of the slurry preparation kettle 1. The rotating shaft 37 is installed in the center of the bottom of the gear ring 23. The scraping plate 24 is attached to the inner wall of the slurry preparation kettle 1. A main gear 19 is installed at the bottom of the rotating shaft 37. A sub-gear 20 is installed at the bottom of the auxiliary stirring rod 21. The main gear 19 meshes with the sub-gear 20. The sub-gear 20 is rotatably connected to the outer ring of the main gear 19. The top of the auxiliary stirring rod 21 is rotatably connected to the bottom of the gear ring 23. A second servo motor 26 is installed on the top of the driving assembly 25. A belt 27 is installed in the inner cavity of the driving assembly 25. Belt pulleys 28 are installed on both sides of the inner cavity of the belt 27. The bottom of the second servo motor 26 is installed on the top of one of the belt pulleys 28 through a first rotating shaft. One belt pulley 28 is installed on the top of the gear 22. The other belt pulley 28 is installed on the top of the first stirring rod 31. The opposite sides of the two first stirring rods 31 are rotatably connected to the center of the inner cavity of the baffle plate 29. An electric heating wire 30 is installed on the inner wall of the baffle plate 29. A screw conveyor 39 is installed at the top of the side of the stirring kettle 2. The bottom of the screw conveyor 39 is installed at the bottom of the outer wall of the slurry preparation kettle 1; By starting the second servo motor 26 set, the pulley 28 and the belt 27 can be driven, so that the pulley 28 can drive the gear 22 and the first stirring rod 31 to rotate. The gear 22 can mesh with the gear ring 23, so that the gear ring 23 can drive the second stirring rod 38 and the scraper 24 to rotate through the rotating shaft 37. At the same time, it can also drive the main gear 19 to mesh with the auxiliary gear 20, so that the auxiliary stirring rod 21 can also rotate. Based on this, the efficiency of material mixing can be improved. By setting the electric heating wire 30, the stirring kettle 2 can be heated, and with the first stirring rod 31 and the baffle 29 set, the mixing efficiency of the materials can be further improved. Embodiment Three:

[0025] As Figure 1 As shown in the figure, a catalytic device for bio-based polyester PTT. A static mixer 35 is installed in the inner cavity of the first reactor 3, an ultrasonic vibrator 36 is installed in the inner cavity of the second reactor 4, a delivery pipe 32 is installed at the bottom of the outer wall of the stirring kettle 2, the delivery pipe 32 is connected to the first reactor 3, feeding pipes 33 are installed at the tops of both the first reactor 3 and the second reactor 4, a discharge pipe 34 is installed on the outer wall of the second reactor 4, and the inner cavities of the first reactor 3 and the second reactor 4 are connected by pipes; By setting the first reactor 3 and the second reactor 4, the materials can be further reacted through the static mixer 35 and the ultrasonic vibrator 36 until the catalysis is completed.

[0026] A catalytic method for bio-based polyester PTT includes the following operating steps: S1: Inject propylene glycol into the inner cavity of the slurry preparation kettle 1 after being treated by the molecular sieve dehydration tower 15 and the ion exchange resin column 16; S2: Inject terephthalic acid into the inner cavity of the screening box 11, start the first servo motor 6, drive the impact rod 7 to rotate. When the impact rod 7 rotates, it will contact the screening box 11 through the impact rod 7, and based on this, drive the screening box 11 to move. At this time, the screening box 11 can screen the terephthalic acid. The qualified terephthalic acid is input into the inner cavity of the slurry preparation kettle 1 through the feeder 14. After being vibrated, the screening box 11 will drive the movable block 12 to move in the inner cavity of the movable groove 9 and on the outer wall of the guide rod 10, and at the same time, will squeeze the spring 13. At this time, the spring 13 can increase the vibration amplitude of the screening box 11 through the movable block 12; S3: Start the second servo motor 26 to drive the belt 27 and the pulley 28. One pulley 28 drives the gear 22 to rotate. At this time, the gear 22 meshes with the gear ring 23. Based on this, the second stirring rod 38 and the scraper 24 are driven to rotate by the rotating shaft 37. The second stirring rod 38 stirs the materials entering its inner cavity. The scraper 24 prevents the materials from sticking and accumulating on the inner wall of the slurry preparation kettle 1. The gear ring 23 drives the auxiliary stirring rod 21 to rotate in a circle. When the rotating shaft 37 rotates, it will drive the main gear 19 to rotate. After the main gear 19 meshes with the sub-gear 20, the auxiliary stirring rod 21 can be driven to rotate self - rotation. Based on this, the efficiency of material mixing is improved. Place the catalyst in the inner cavity of the dilution tank 17, and input the catalyst into the inner cavity of the slurry preparation kettle 1 through the injection ring pipe 18 for mixing together. After mixing is completed, start the screw conveyor 39 to input the materials into the inner cavity of the stirring kettle 2; S4: Another pulley 28 drives the first stirring rod 31 to rotate. The first stirring rod 31 can stir the materials entering its inner cavity, cooperate with the baffle 29 to strengthen the mixing of the materials, and at the same time start the electric heating wire 30 to heat the internal materials until the reaction is completed and the propylene glycol phthalate monomer is generated; S5: Input the propylene glycol phthalate monomer into the inner cavity of the first reactor 3 through the conveying pipe 32, input the matting agent into the inner cavity of the first reactor 3, mix them through the static mixer 35. After mixing is completed, input the materials in the inner cavity of the first reactor 3 into the inner cavity of the second reactor 4, input the heat stabilizer into the inner cavity of the second reactor 4, and react through the ultrasonic vibration rod 36. After the reaction is completed, the catalytic treatment can be completed and discharged through the discharge pipe 34.

[0027] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above - mentioned embodiments. What is described in the above - mentioned embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A catalytic device for bio-based polyester PTT, comprising a slurry preparation kettle (1), a stirring kettle (2), a first reactor (3), and a second reactor (4), characterized in that: On one side of the top of the slurry preparation kettle (1), a vibration screening assembly (5) is provided. On the other side of the top of the slurry preparation kettle (1), an ion exchange resin column (16) is provided. A molecular sieve dehydration tower (15) is installed on the top of the ion exchange resin column (16). A rotating shaft (37) is rotatably connected in the inner cavity of the slurry preparation kettle (1). A second stirring rod (38) is installed on the outer wall of the rotating shaft (37). A scraping plate (24) is installed on the outer wall of the second stirring rod (38). An auxiliary stirring rod (21) is arranged on the side of the second stirring rod (38). A baffle plate (29) is installed in the middle of the inner cavity of the stirring kettle (2). First stirring rods (31) are rotatably connected to both the top and the bottom of the inner cavity of the stirring kettle (2). A driving assembly (25) is installed on the top of the stirring kettle (2). A static mixer (35) is installed in the inner cavity of the first reactor (3). An ultrasonic vibration rod (36) is installed in the inner cavity of the second reactor (4).

2. The catalytic device for a bio-based polyester PTT according to claim 1, characterized in that: The vibration screening assembly (5) has a cavity structure with the top and the bottom communicating with the outside. A through groove (8) is formed on the side of the inner cavity of the vibration screening assembly (5). Movable grooves (9) are symmetrically formed at both ends of the inner cavity of the vibration screening assembly (5). A guiding rod (10) is installed in the inner cavity of the movable groove (9). A first servo motor (6) is installed on the side of the vibration screening assembly (5). An impact rod (7) is installed at the bottom of the first servo motor (6) through a first rotating shaft. The impact rod (7) is movably connected in the inner cavity of the through groove (8).

3. The catalytic device for a bio-based polyester PTT according to claim 2, characterized in that: Movable blocks (12) are symmetrically installed at the middle of both ends of the screening box (11). The movable blocks (12) are movably connected to the inner cavity of the movable groove (9) and sleeved on the outer wall of the guiding rod (10). Springs (13) are symmetrically installed on both sides of the movable blocks (12). The springs (13) are wound around the outer wall of the guiding rod (10). The other ends of the springs (13) are installed in the inner cavity of the movable groove (9). A blanking device (14) is installed at the bottom of the screening box (11). The blanking device (14) is installed on the top of the slurry preparation kettle (1) and communicates with its inner cavity. The inner cavities of the molecular sieve dehydration tower (15), the ion exchange resin column (16) and the slurry preparation kettle (1) communicate with each other.

4. A catalytic device for a bio-based polyester PTT according to claim 1, characterized in that: A spray ring pipe (18) is installed at the bottom of the inner cavity of the slurry preparation kettle (1). A dilution tank (17) is installed at the bottom of the outer wall of the slurry preparation kettle (1). The dilution tank (17) communicates with the inner cavity of the spray ring pipe (18). A gear ring (23) is connected to the top of the inner cavity of the slurry preparation kettle (1). A gear (22) meshes with the side of the gear ring (23). The gear (22) is rotatably connected to the top of the inner cavity of the slurry preparation kettle (1).

5. A catalytic device for a bio-based polyester PTT according to claim 1, characterized in that: The rotating shaft (37) is installed at the exact center of the bottom of the gear ring (23). The scraping plate (24) is attached to the inner wall of the slurry preparation kettle (1). A main gear (19) is installed at the bottom of the rotating shaft (37). A secondary gear (20) is installed at the bottom of the auxiliary stirring rod (21). The main gear (19) meshes with the secondary gear (20). The secondary gear (20) is rotatably connected to the outer ring of the main gear (19). The top of the auxiliary stirring rod (21) is rotatably connected to the bottom of the gear ring (23).

6. The catalytic device for a bio-based polyester PTT according to claim 1, characterized in that: A second servo motor (26) is installed at the top of the drive assembly (25). A belt (27) is installed in the inner cavity of the drive assembly (25). Belt pulleys (28) are installed on both sides of the inner cavity of the belt (27). The bottom of the second servo motor (26) is installed on the top of one of the belt pulleys (28) through a first rotating shaft. One of the belt pulleys (28) is installed on the top of the gear (22). The other belt pulley (28) is installed on the top of the first stirring rod (31).

7. A catalytic device for a bio-based polyester PTT according to claim 1, characterized in that: The opposite sides of the two first stirring rods (31) are rotatably connected to the exact center of the inner cavity of the baffle plate (29). Electric heating wires (30) are installed on the inner wall of the baffle plate (29). A screw conveyor (39) is installed at the top of the side of the stirring kettle (2). The bottom of the screw conveyor (39) is installed at the bottom of the outer wall of the slurry preparation kettle (1).

8. A catalytic device for a bio-based polyester PTT according to claim 1, characterized in that: A delivery pipe (32) is installed at the bottom of the outer wall of the stirring kettle (2). The delivery pipe (32) is connected to the first reactor (3). Feeding pipes (33) are installed at the tops of both the first reactor (3) and the second reactor (4). A discharge pipe (34) is installed on the outer wall of the second reactor (4).

9. A catalytic device for a bio-based polyester PTT according to claim 1, characterized in that: The inner cavities of the first reactor (3) and the second reactor (4) are connected by a pipeline.

10. A catalytic method for bio-based polyester PTT, which uses a catalytic device for bio-based polyester PTT as described in any one of the above claims 1-9, characterized in that: It includes the following operating steps: S1: Inject propylene glycol into the inner cavity of the slurry preparation kettle (1) after being processed by the molecular sieve dehydration tower (15) and the ion exchange resin column (16). S2: Inject terephthalic acid into the inner cavity of the screening box (11). Start the first servo motor (6) to drive the impact rod (7) to rotate. When the impact rod (7) rotates, it will contact the screening box (11) through the impact rod (7), thereby driving the screening box (11) to move. At this time, the screening box (11) can screen the terephthalic acid. The qualified screened terephthalic acid is input into the inner cavity of the slurry preparation kettle (1) through the feeder (14). After being vibrated, the screening box (11) will drive the movable block (12) to move in the inner cavity of the movable groove (9) and on the outer wall of the guide rod (10), and at the same time, it will squeeze the spring (13). At this time, the spring (13) can increase the vibration amplitude of the screening box (11) through the movable block (12). S3: Start the second servo motor (26) to drive the belt (27) and the pulley (28). One pulley (28) drives the gear (22) to rotate. At this time, the gear (22) meshes with the gear ring (23). Based on this, the second stirring rod (38) and the scraper (24) are driven to rotate through the rotating shaft (37). The second stirring rod (38) stirs the materials entering its inner cavity. The scraper (24) prevents the materials from sticking and accumulating on the inner wall of the slurry preparation kettle (1). The gear ring (23) drives the auxiliary stirring rod (21) to rotate in a circle. When the rotating shaft (37) rotates, it will drive the main gear (19) to rotate. After the main gear (19) meshes with the sub-gear (20), it can drive the auxiliary stirring rod (21) to rotate self-rotation. Based on this, the efficiency of material mixing is improved. Place the catalyst in the inner cavity of the dilution tank (17), and input the catalyst into the inner cavity of the slurry preparation kettle (1) through the injection ring pipe (18) for mixing together. After mixing is completed, start the screw conveyor (39) to input the materials into the inner cavity of the stirring kettle (2); S4: Another pulley (28) drives the first stirring rod (31) to rotate. The first stirring rod (31) can stir the materials entering its inner cavity, cooperate with the baffle plate (29) to strengthen the mixing of the materials, and at the same time start the electric heating wire (30) to heat the internal materials until the reaction is completed and the dimethyl terephthalate propylene glycol monomer is generated; S5: Input the dimethyl terephthalate propylene glycol monomer into the inner cavity of the first reactor (3) through the delivery pipe (32), input the matting agent into the inner cavity of the first reactor (3), and mix it through the static mixer (35). After mixing is completed, input the materials in the inner cavity of the first reactor (3) into the inner cavity of the second reactor (4), input the heat stabilizer into the inner cavity of the second reactor (4), and react through the ultrasonic vibration rod (36). After the reaction is completed, the catalytic treatment can be completed and discharged through the discharge pipe (34).

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