External circulation type polycondensation kettle
By introducing an external circulation system and a solution filter into the polycondensation reactor, the problem of the inability to filter the solution in the existing technology is solved, improving product quality and reaction efficiency, especially with faster evaporation of EG in the later stages of the reaction.
Patent Information
- Application Number
- CN202423262843.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Existing polycondensation reactors cannot use solution filters, resulting in decreased product quality and low reaction efficiency, especially in the later stages of the reaction when EG volatilization is slow.
An external circulation system is introduced into the polycondensation reactor. The solution is transported to the solution filter by a solution pump and then the solution is returned to the reactor by a melt pump.
It improved product quality, reduced the frequency of consumable replacement, lowered costs, and accelerated the reaction speed, especially in the later stages of the reaction when EG evaporates faster.
Smart Images
Figure CN223641841U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of polycondensation reactor technology, and in particular to an external circulation polycondensation reactor. Background Technology
[0002] A polycondensation reactor is a container specifically designed for polycondensation reactions. Polycondensation is a special type of polymerization reaction that typically involves the condensation of small molecules into larger molecules, accompanied by the removal of water or other small molecule byproducts. Polycondensation reactors are commonly used to produce polymeric materials such as polyesters and polyamides. Existing polycondensation reactors have relatively low discharge pressures; this low pressure prevents the use of melt filters, and the small amounts of impurities generated during the reaction cannot be removed, affecting product quality. Current polycondensation reactors use stirring to promote the volatilization of EG vapor, but this method is inefficient and slow in the later stages of the reaction. Utility Model Content
[0003] To address the shortcomings of existing technologies, this invention provides an external circulation polycondensation reactor, which solves the problem that polycondensation reactors cannot use melt filters, thus affecting product quality.
[0004] According to an embodiment of this utility model, an external circulation polycondensation reactor includes a polycondensation reactor body, a stirring shaft, a main motor, a melt pump, and a melt filter. The stirring shaft is rotatably disposed inside the polycondensation reactor body, with its top extending to the top of the polycondensation reactor body. The main motor is fixedly disposed on the top of the polycondensation reactor body and fixedly connected to the stirring shaft. A discharge port is provided at the bottom of the polycondensation reactor body, and the discharge port is connected to the melt pump. The other end of the melt pump is connected to the melt filter, and the outlet of the melt filter is connected to the interior of the polycondensation reactor body.
[0005] The technical principle of this invention is as follows: This invention adds an external circulation to the polycondensation reactor, and the circulation power is provided by the melt pump, so that the melt returns to the polycondensation reactor through the melt filter, thereby completing the filtration step.
[0006] Preferably, the melt pump is equipped with a heater inside and an insulation layer outside.
[0007] Preferably, the solution filter includes a frame, an upper fixing plate, a lower fixing plate, several filter elements, and a drive unit. The upper and lower fixing plates are correspondingly arranged and rotatably connected to the frame. The filter elements are cylindrical and vertically arranged, with both ends of the filter element fixedly connected to the upper and lower fixing plates, respectively. The upper and lower fixing plates are respectively provided with connection ports communicating with both ends of the filter element, and both ends of the filter element are connected to the connection ports. The drive unit is used to drive the lower fixing plate to rotate.
[0008] Preferably, the drive unit includes a secondary motor and a primary gear. The lower fixed plate is a circular plate with a driven gear on its outer side. The secondary motor is fixedly mounted on the side of the lower fixed plate, and the primary gear is fixedly mounted on the output shaft of the secondary motor. The primary gear and the driven gear mesh.
[0009] Preferably, a cylindrical protective cover is provided between the upper fixing plate and the lower fixing plate; the protective cover is provided with an opening and closing door for the filter element to pass through.
[0010] Compared to existing technologies, this invention offers the following advantages: By installing a melt pump outside the polycondensation reactor, the melt receives sufficient pressure to be transported to a melt filter, after which it returns to the polycondensation reactor. This removes small amounts of impurities generated in the melt, improving product quality. For downstream users, the frequency of consumable replacement can be significantly reduced, lowering consumable costs. Simultaneously, the increased external circulation accelerates melt surface renewal, leading to faster EG volatilization and effectively increasing the reaction rate, especially in the later stages of the reaction. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0012] Figure 2 This is a schematic diagram of the filter element of this utility model.
[0013] In the above attached figures: 1. Polycondensation reactor body; 2. Stirring shaft; 3. Main motor; 4. Melt pump; 5. Upper fixed plate; 6. Lower fixed plate; 7. Fixing frame; 8. Auxiliary motor; 9. Main gear; 10. Filter element; 11. Outer shell; 12. Feed inlet; 13. Discharge outlet. Detailed Implementation
[0014] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.
[0015] like Figure 1As shown in the figure, this utility model embodiment proposes an external circulation polycondensation reactor, including a polycondensation reactor body 1, a stirring shaft 2, a main motor 3, a melt pump 4, and a melt filter. The stirring shaft 2 is rotatably disposed inside the polycondensation reactor body 1, with its top extending to the top of the polycondensation reactor body 1. The main motor 3 is fixedly disposed on the top of the polycondensation reactor body 1 and fixedly connected to the stirring shaft 2. A discharge port is provided at the bottom of the polycondensation reactor body 1, which is connected to the melt pump 4. The other end of the melt pump 4 is connected to the melt filter, and the outlet of the melt filter is connected to the interior of the polycondensation reactor body 1. The polycondensation reactor body 1, the melt pump 4, and the pump body filter are connected by a high-pressure pipe to prevent melt leakage or pipe damage. All connections are sealed. While the melt is stirred in the polycondensation reactor body 1, the melt is carried out from the discharge port by the pressure generated by the melt pump 4. In this embodiment, the melt pump 4 is provided with two gears, and the melt is transported by the change in working volume caused by the meshing of the two gears.
[0016] Preferably, the melt pump 4 is equipped with a heater inside and an insulation layer outside to prevent the melt from solidifying inside the melt pump 4 and causing blockage, thus ensuring the stable operation of the melt pump 4.
[0017] like Figure 2As shown, preferably, the solution filter includes a fixing frame 7, an upper fixing plate 5, a lower fixing plate 6, several filter elements 10, and a drive unit. The upper fixing plate 5 and the lower fixing plate 6 are arranged vertically and rotatably connected to the fixing frame 7. The filter elements 10 are cylindrical and vertically arranged. Both ends of the filter element 10 are fixedly connected to the upper fixing plate 5 and the lower fixing plate 6, respectively. The upper fixing plate 5 and the lower fixing plate 6 are respectively provided with connection ports communicating with both ends of the filter element 10. Both ends of the filter element 10 are connected to the connection ports. In this embodiment, the filter element 10 has a cylindrical structure, and the filter element 10 is wrapped with a metal shell 11. The top of the shell 11 is provided with a feed inlet 12, which communicates with the interior of the filter element 10. The filtrate flows from the side wall to the bottom of the inner side of the shell 11 after being filtered by the filter element 10. The bottom of the shell 11 is provided with a discharge outlet 13. The top of the upper fixed plate 5 is rotatably and sealed to the high-pressure pipe, ensuring that the filter element 10 receives the filtrate when rotating. After the high-pressure pipe transmits the filtrate to the upper fixed plate 5, pipes are provided on the upper fixed plate 5 to allow the filtrate to be distributed to each filter element 10. The lower fixed plate 6 is also rotatably and sealed to the high-pressure pipe. After the outlets 13 of each outer shell 11 converge, the filtrate is discharged through the lower fixed plate 6. The drive unit is used to drive the lower fixed plate 6 to rotate. In use, the melt is pressured by the melt pump 4 and transmitted to the upper end of the filter element 10 through a conduit. Then, after being filtered on the filter element 10, the melt flows back from the lower end to the interior of the polycondensation reactor body 1. During this process, the drive unit drives the lower fixed plate 6 to rotate. Under the centrifugal force and the pressure generated by the melt pump 4, the melt can quickly pass through the filter element 10, accelerating the filtration speed.
[0018] Preferably, the drive unit includes a secondary motor 8 and a primary gear 9. The lower fixed plate 6 is a circular plate with a driven gear on its outer side. The secondary motor 8 is fixedly mounted on the side of the lower fixed plate 6, and the primary gear 9 is fixedly mounted on the output shaft of the secondary motor 8. The primary gear 9 and the driven gear mesh. In this embodiment, the melt pump 4 and the secondary motor 8 are turned on simultaneously, allowing the melt to flow normally.
[0019] Preferably, a cylindrical protective cover is provided between the upper fixing plate 5 and the lower fixing plate 6, and the protective cover is provided with an opening and closing door for the filter element 10 to pass through. This prevents the filtrate from being thrown out when the lower fixing plate 6 drives the filter element 10 to rotate at high speed. When it is necessary to replace or clean the filter element 10, the fasteners between the filter element 10 and the upper fixing plate 5 and the lower fixing plate 6 are removed, and the filter element 10 can be taken out from the opening and closing door.
[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. An external circulation polycondensation reactor, characterized in that: The apparatus includes a polycondensation reactor body (1), a stirring shaft (2), a main motor (3), a melt pump (4), and a melt filter. The stirring shaft (2) is rotatably disposed inside the polycondensation reactor body (1), and the top of the stirring shaft (2) extends to the top of the polycondensation reactor body (1). The main motor (3) is fixedly disposed on the top of the polycondensation reactor body (1) and fixedly connected to the stirring shaft (2). The bottom of the polycondensation reactor body (1) is provided with a discharge port, which is connected to the melt pump (4). The other end of the melt pump (4) is connected to the melt filter, and the outlet of the melt filter is connected to the interior of the polycondensation reactor body (1).
2. The external circulation polycondensation reactor as described in claim 1, characterized in that: The melt pump (4) is equipped with a heater inside and an insulation layer outside.
3. The external circulation polycondensation reactor as described in claim 1, characterized in that: The solvent filter includes a frame (7), an upper fixing plate (5), a lower fixing plate (6), several filter elements (10), and a drive unit. The upper fixing plate (5) and the lower fixing plate (6) are arranged vertically and rotatably connected to the frame (7). The filter elements (10) are cylindrical and vertically arranged. The two ends of the filter elements (10) are fixedly connected to the upper fixing plate (5) and the lower fixing plate (6) respectively. The upper fixing plate (5) and the lower fixing plate (6) are respectively provided with connection ports that communicate with the two ends of the filter elements (10). The upper and lower ends of the filter elements (10) are both connected to the connection ports. The drive unit is used to drive the lower fixing plate (6) to rotate.
4. The external circulation polycondensation reactor as described in claim 3, characterized in that: The drive unit includes a secondary motor (8) and a main gear (9). The lower fixed plate (6) is a circular plate with a driven gear on its outer side. The secondary motor (8) is fixedly mounted on the side of the lower fixed plate (6). The main gear (9) is fixedly mounted on the output shaft of the secondary motor (8). The main gear (9) and the driven gear mesh.
5. The external circulation polycondensation reactor as described in claim 4, characterized in that: A cylindrical protective cover is provided between the upper fixing plate (5) and the lower fixing plate (6); the protective cover is provided with an opening and closing door that can be used for the filter element (10) to pass through.