Esterification reactor for regenerated PBT (polybutylene terephthalate) production
By introducing spiral blades and scrapers into the esterification reactor, combined with an automated cleaning system for the stirring blades and scrapers, the problems of difficult discharge and tedious cleaning in traditional esterification reactors have been solved, achieving efficient discharge and automated cleaning, and improving PBT production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-03-06
AI Technical Summary
Traditional esterification reactors are prone to material buildup during discharge, and cleaning up residual reactants requires manual operation, resulting in low production efficiency.
An esterification reactor comprising an outer barrel and an inner barrel was designed. The bottom of the inner barrel is equipped with spiral blades, and the discharge pipe is equipped with scrapers and scrapers. The design of the stirring blades and scrapers enables automated cleaning of residual reactants, and the spiral blades prevent reactant accumulation. Combined with the flushing system of the condenser pipe and nozzles, automatic cleaning is achieved.
It effectively prevents reactant accumulation, improves discharge efficiency, reduces cleaning time, reduces user workload, and improves production efficiency.
Smart Images
Figure CN223969929U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of esterification reactor technology, specifically an esterification reactor for the production of regenerated PBT. Background Technology
[0002] PBT is a strong, tough, and highly insulating high-performance engineering plastic widely used in the automotive, electronics, and electrical appliance industries. In the production process of PBT, the esterification reaction plays a crucial role. It involves reacting polyterephthalic acid with butanediol to produce polyester, thereby obtaining PBT material.
[0003] Currently, in traditional esterification reactors, reactants may accumulate at the discharge pipe during the discharge process, making it difficult to discharge them. Furthermore, after use, users need to manually clean up the residual reactants, which increases their workload and reduces production efficiency. Utility Model Content
[0004] The purpose of this invention is to provide an esterification reactor for the production of regenerated PBT, in order to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an esterification reactor for the production of regenerated PBT, comprising an outer barrel and an inner barrel, the inner barrel being fixedly connected to the inside of the outer barrel, a barrel cover being hinged to the top of the outer barrel, and an electromagnetic heating coil being fixedly installed inside the outer barrel, the electromagnetic heating coil being arranged around the inner barrel, a reduction motor being fixedly connected to the center of the top of the barrel cover, an installation shaft being fixedly connected to the output end of the reduction motor, the installation shaft being disposed inside the inner barrel, and a plurality of first connecting rings being fixedly connected to the outer side of the installation shaft, and stirring blades being fixedly connected to the outer side of each of the plurality of first connecting rings.
[0006] As a further preferred embodiment of this technical solution, a second connecting ring is fixedly connected to the outer side of the bottom of the mounting shaft, an L-shaped plate is fixedly connected to the outer side of the second connecting ring, and a scraper is fixedly connected to one side of the L-shaped plate.
[0007] As a further preferred embodiment of this technical solution, the bottom of the inner barrel is connected to a discharge pipe, the bottom of the mounting shaft is fixedly connected to a spiral blade, the spiral blade is disposed inside the discharge pipe, and the outer side of the discharge pipe is threadedly connected to a pipe cap.
[0008] As a further preferred embodiment of this technical solution, a first connector is fixedly connected to the top of the bucket lid, a rectangular pipe is installed on the bottom surface of the bucket lid, one end of the first connector is connected to the rectangular pipe, the other end of the first connector is connected to the first pipe, and a plurality of nozzles are connected to the bottom of the rectangular pipe.
[0009] As a further preferred embodiment of this technical solution, a second connector is fixedly connected to the top of the bucket lid, one end of the second connector is connected to a second pipe, a condenser pipe is fixedly connected to the outside of the second pipe, and an inlet connector and an outlet connector are respectively provided on the outside of both ends of the condenser pipe.
[0010] As a further preferred embodiment of this technical solution, an installation ring is fixedly connected to the outer side of the bottom of the outer barrel, and a collection bucket is provided at the top of one end of the installation ring, with one end of the second pipe connected to the collection bucket.
[0011] As a further preferred embodiment of this technical solution, a temperature sensor is fixedly connected to the top of the bucket lid, and a feed pipe is fixedly connected to the top of the bucket lid.
[0012] This invention provides an esterification reactor for the production of regenerated PBT, which has the following advantages:
[0013] (1) The present invention provides a spiral blade inside the discharge pipe. When the spiral blade rotates, it can agitate the reactants inside the discharge pipe, so that the reactants can flow continuously and be discharged smoothly from the discharge pipe, preventing the reactants from accumulating and clogging the discharge pipe, and improving the discharge efficiency.
[0014] (2) This utility model uses a rectangular pipe and a nozzle to spray and rinse the inner barrel. Then, the mounting shaft drives the L-shaped plate to rotate through the second connecting ring so that the scraper is in contact with the inner wall of the inner barrel and rotates, automatically cleaning the residual reactants on the inner wall of the inner barrel. The residual reactants will mix with water and be discharged from the discharge pipe, thereby reducing the user's workload, reducing the cleaning time of the inner barrel, and improving production efficiency. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the inner barrel structure of this utility model;
[0017] Figure 3 This is a schematic diagram of the mounting shaft structure of this utility model.
[0018] In the diagram: 1. Outer barrel; 2. Barrel lid; 3. Gear motor; 4. First connector; 5. First pipe; 6. Second connector; 7. Second pipe; 8. Condenser; 9. Mounting ring; 10. Collection barrel; 11. Temperature sensor; 12. Feed pipe; 13. Inner barrel; 14. Electromagnetic heating coil; 15. Mounting shaft; 16. First connecting ring; 17. Stirring blade; 18. Second connecting ring; 19. L-shaped plate; 20. Scraper; 21. Spiral blade; 22. Discharge pipe; 23. Rectangular pipe; 24. Nozzle. Detailed Implementation
[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0020] This utility model provides a technical solution: such as Figure 1 and Figure 2 As shown in this embodiment, an esterification reactor for the production of regenerated PBT includes an outer barrel 1 and an inner barrel 13. The inner barrel 13 is fixedly connected to the inside of the outer barrel 1. A barrel cover 2 is hinged to the top of the outer barrel 1, and an electromagnetic heating coil 14 is fixedly installed inside the outer barrel 1. The electromagnetic heating coil 14 is arranged around the inner barrel 13 and is used to heat the inner barrel 13, thereby heating the material to be reacted in the inner barrel 13 and providing reaction conditions for the material. A reduction motor 3 is fixedly connected to the middle of the top of the barrel cover 2. An installation shaft 15 is fixedly connected to the output end of the reduction motor 3. The installation shaft 15 is located inside the inner barrel 13, and several first connecting rings 16 are fixedly connected to the outer side of the installation shaft 15. Stirring blades 17 are fixedly connected to the outer side of each of the several first connecting rings 16. Driven by the reduction motor 3, the installation shaft 15 is driven to rotate. The installation shaft 15 drives the stirring blades 17 to rotate through the first connecting rings 16, thereby stirring the material and the catalyst, so that the two are uniformly mixed and reacted.
[0021] A temperature sensor 11 is fixedly connected to the top of the barrel lid 2, and a feed pipe 12 is also fixedly connected to the top of the barrel lid 2. The temperature sensor 11 is model FZ002, and its bottom sensing end penetrates through the barrel lid 2 and is set inside the inner barrel 13. It is used to monitor the temperature in the inner barrel 13 in real time to ensure that the temperature is controlled within the temperature range required for the esterification reaction. The feed pipe 12 is used to feed materials and catalysts into the inner barrel 13.
[0022] The bottom of the inner barrel 13 is connected to the discharge pipe 22, and the bottom of the mounting shaft 15 is fixedly connected to the spiral blade 21. The spiral blade 21 is set inside the discharge pipe 22, and the outer side of the discharge pipe 22 is threaded with a pipe cap. When the reactants are discharged, the reduction motor 3 drives the mounting shaft 15 to rotate, which in turn drives the spiral blade 21 to rotate. During the rotation of the spiral blade 21, the reactants at the bottom of the inner barrel 13 and the discharge pipe 22 can be stirred, so that the reactants can flow smoothly and be discharged from the discharge pipe 22.
[0023] A second connector 6 is fixedly connected to the top of the lid 2. One end of the second connector 6 is connected to a second pipe 7. A condenser 8 is fixedly connected to the outside of the second pipe 7. Water inlet connectors and water outlet connectors are respectively provided on the outside of both ends of the condenser 8. The water inlet connectors and water outlet connectors are used for the circulation of cooling medium in the condenser 8. An installation ring 9 is fixedly connected to the outside of the bottom of the outer barrel 1. A collection tank 10 is provided on the top of one end of the installation ring 9. One end of the second pipe 7 is connected to the collection tank 10. When the material in the inner barrel 13 undergoes the esterification reaction, the steam generated by the high temperature will enter the second pipe 7. During this period, the steam is cooled by the condenser 8 and condenses into a liquid in the second pipe 7. This liquid is a solution formed by water and tetrahydrofuran. Subsequently, the solution drips into the collection tank 10 for collection to prevent the vapor containing tetrahydrofuran from diffusing into the air.
[0024] like Figure 1 and Figure 3 As shown, a first connector 4 is fixedly connected to the top of the bucket lid 2, and a rectangular pipe 23 is installed on the bottom surface of the bucket lid 2. One end of the first connector 4 is connected to the rectangular pipe 23, and the other end of the first connector 4 is connected to the first pipe 5. Several nozzles 24 are connected to the bottom of the rectangular pipe 23. One end of the first pipe 5 is connected to an external water pump. When the external water pump is working, it draws clean water and delivers the water through the first pipe 5 to the first connector 4. Then the water enters the rectangular pipe 23 and is sprayed out by the nozzles 24 to rinse the components inside the inner bucket 13.
[0025] A second connecting ring 18 is fixedly connected to the outer side of the bottom of the mounting shaft 15. An L-shaped plate 19 is fixedly connected to the outer side of the second connecting ring 18. A scraper 20 is fixedly connected to one side of the L-shaped plate 19. When the reduction motor 3 drives the mounting shaft 15 to rotate, the mounting shaft 15 drives the L-shaped plate 19 to rotate through the second connecting ring 18. During the material reaction, the L-shaped plate 19 can cooperate with the stirring blade 17 to stir the material. When cleaning the inner barrel 13, the scraper 20 can rotate along the inner wall of the inner barrel 13 to scrape off the residual reactants on the inner wall of the inner barrel 13.
[0026] This invention provides an esterification reactor for the production of recycled PBT. The specific working principle is as follows: Materials and a certain proportion of catalyst are fed into the inner tank 13 through the feed pipe 12. Then, the geared motor 3 and electromagnetic heating coil 14 are started. The electromagnetic heating coil 14 heats the inner tank 13. During heating, the temperature sensor 11 monitors the temperature in the inner tank 13 in real time, ensuring that the temperature in the inner tank 13 remains within a preset temperature range of 210-230°C to guarantee the normal progress of the esterification reaction. The geared motor 3 drives the mounting shaft 15 to rotate. The mounting shaft 15 drives the stirring blades 17 to rotate through the first connecting ring 16, thereby stirring the materials and catalyst to ensure uniform mixing and reaction. During the reaction, the high temperature... The generated steam enters the second pipe 7, where it is cooled by the condenser 8 and condenses into a liquid state. This liquid is a solution of water and tetrahydrofuran. The solution then drips into the collection tank 10 to prevent the tetrahydrofuran-containing vapor from diffusing into the air. After the reaction is complete, the reactants are smoothly discharged from the discharge pipe 22 under the rotation of the spiral blade 21. Then, the external water pump is started to draw clean water and transport it through the first pipe 5 to the first connector 4. The water then enters the rectangular pipe 23 and is sprayed out by the nozzle 24 to rinse the components inside the inner barrel 13. During rinsing, the scraper 20 rotates along the inner wall of the inner barrel 13 through the cooperation of the second connecting ring 18 and the L-shaped plate 19 to scrape off the residual reactants on the inner wall of the inner barrel 13.
[0027] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An esterification reactor for the regeneration of PBT production comprising an outer shell (1) and an inner shell (13), characterized in that: The inner barrel (13) is fixedly connected to the inside of the outer barrel (1), the top of the outer barrel (1) is hingedly connected with a barrel cover (2), and the inside of the outer barrel (1) is fixedly installed with an electromagnetic heating coil (14), the electromagnetic heating coil (14) is arranged around the inner barrel (13), the middle of the top of the barrel cover (2) is fixedly connected with a speed reducer motor (3), the output end of the speed reducer motor (3) is fixedly connected with a mounting shaft (15), the mounting shaft (15) is arranged in the inside of the inner barrel (13), and the outer side of the mounting shaft (15) is fixedly connected with a plurality of first connecting rings (16), the outer side of each of the plurality of first connecting rings (16) is fixedly connected with a stirring blade (17). The outer side of the bottom of the mounting shaft (15) is fixedly connected with a second connecting ring (18), the outer side of the second connecting ring (18) is fixedly connected with an L-shaped plate (19), one side of the L-shaped plate (19) is fixedly connected with a scraper (20). The bottom of the inner barrel (13) is communicated with a discharge pipe (22), the bottom of the mounting shaft (15) is fixedly connected with a spiral blade (21), the spiral blade (21) is arranged in the inside of the discharge pipe (22), and the outer side of the discharge pipe (22) is threadedly connected with a pipe cap.
2. An esterification reactor for the production of PBT according to claim 1, characterized in that: The top of the barrel cover (2) is fixedly connected with a first connector (4), the bottom surface of the barrel cover (2) is provided with a rectangular pipe (23), one end of the first connector (4) is communicated with the rectangular pipe (23), the other end of the first connector (4) is communicated with a first pipe (5), and the bottom of the rectangular pipe (23) is communicated with a plurality of spray heads (24).
3. An esterification reactor for the production of PBT according to claim 1, characterized in that: The top of the barrel cover (2) is fixedly connected with a second connector (6), one end of the second connector (6) is communicated with a second pipe (7), the outer side of the second pipe (7) is fixedly connected with a condenser pipe (8), and the outer sides of the two ends of the condenser pipe (8) are respectively provided with water inlet connectors and water outlet connectors.
4. An esterification reactor for the production of PBT according to claim 3, characterized in that: The outer side of the bottom of the outer barrel (1) is fixedly connected with a mounting ring (9), the top of one end of the mounting ring (9) is provided with a collection barrel (10), and one end of the second pipe (7) is communicated with the collection barrel (10).
5. An esterification reactor for the production of PBT according to claim 1, characterized in that: The top of the barrel cover (2) is fixedly connected with a temperature sensor (11), and the top of the barrel cover (2) is fixedly connected with a feeding pipe (12). The top of the barrel cover (2) is fixedly connected with a temperature sensor (11), and the top of the barrel cover (2) is fixedly connected with a feeding pipe (12).