A stirring mechanism and a reaction kettle for producing polyketone
By designing upper and lower air vents and stirring rods in the polyketide production process, the gas-liquid mass transfer effect is improved, solving the problems of slow reaction rate and wall agglomeration of polyketide, and achieving efficient and stable production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHAMBROAD CHEM IND RES INST CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-06-23
AI Technical Summary
In existing polyketone production processes, the low solubility of CO leads to a slow reaction rate and low gas-liquid mass transfer efficiency. Furthermore, polyketone tends to clump together on the inner wall of the reactor, affecting production continuity and equipment utilization.
Design a stirring mechanism that introduces gas into the bottom of the liquid through the upper and lower air inlet pipes via the main shaft, combined with upper and lower stirring rods. The mechanism utilizes ribbon-type stirring blades and I-shaped stirring rods to improve gas-liquid mass transfer and prevent polyketone from adhering to the wall and clumping.
It improves the efficiency of gas-liquid reaction, prevents polyketide from clumping in the reactor, achieves production stability and continuity, and enhances equipment utilization.
Smart Images
Figure CN224388775U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of polymer material production technology using gas as raw material, specifically to a stirring mechanism and reaction vessel for producing polyketide. Background Technology
[0002] Polyketone is a green polymer material formed by alternating copolymerization of CO and olefins. It possesses excellent properties such as high melting point, heat and wear resistance, chemical corrosion resistance, good barrier properties, and photodegradability, and can be widely used in engineering plastics, films, and other fields. Its raw material, CO, is widely available and can be obtained through coal gasification or industrial waste gas purification, meeting energy conservation and environmental protection requirements.
[0003] However, in the existing production process, the raw material CO has low solubility in solution, and the polyketide reaction is a slurry reaction, which further hinders the gas-liquid mass transfer efficiency, resulting in a slow reaction rate and a longer single-reactor cycle, which restricts equipment utilization and capacity improvement. At the same time, polyketide is prone to clumping on the inner wall of the reactor, which not only deteriorates the mass transfer environment, but also forces the reactor to be shut down regularly for cleaning, disrupting production continuity and increasing costs. Utility Model Content
[0004] The purpose of this invention is to design a stirring mechanism and reaction vessel for producing polyketide, which improves gas-liquid mass transfer, increases reaction efficiency, and effectively prevents polyketide products from clumping together on the reactor walls. The technical solution adopted by this invention is as follows:
[0005] A stirring mechanism for producing polyketide includes a main shaft and a set of upper stirring rods connected to the main shaft. The main shaft has at least an upper hollow tube at its upper part, and a hollow crossbeam communicating with the upper hollow tube is provided at the lower end of the upper hollow tube. At least a portion of the upper stirring rods are connected to the hollow crossbeam, and the upper stirring rods are provided with vent lines communicating with the hollow crossbeam. The vent lines are provided with vent holes. A first air inlet pipe with a first check valve at its lower end is provided inside the upper hollow tube.
[0006] Furthermore, the main shaft consists of an upper hollow tube, a solid tube, and a lower hollow tube from top to bottom. A second air inlet pipe is installed inside the lower hollow tube, extending from the lower end. A second check valve is installed at the upper end of the second air inlet pipe. A lower stirring rod with an air outlet is installed at the lower part of the main shaft, and the lower stirring rod is connected to the lower hollow tube.
[0007] Furthermore, the lower stirring rod is an I-shaped stirring rod, with the upper support crossbar between its two uprights fixedly connected to the main shaft. The upper support rod is a hollow tube with an air vent, and the upper support rod is connected to the lower hollow tube.
[0008] Furthermore, the lower ends of the two uprights of the I-shaped stirring rod are connected by a lower support crossbar.
[0009] Furthermore, the upper stirring rod is composed of a set of spiral stirring blades, and the middle position of each upper stirring rod is connected to the hollow crossbeam. Each upper stirring rod below the hollow crossbeam is provided with a ventilation pipe; the upper part of each upper stirring rod is fixedly connected to the first support crossbeam, and the lower part of each upper stirring rod is fixedly connected to the second support crossbeam.
[0010] Furthermore, the venting line is fixed to the outer surface of the upper stirring rod, and the vent is located at the end of the venting line.
[0011] This utility model also provides a reaction vessel for producing polyketide, including a tank body. The tank body is equipped with any of the aforementioned stirring mechanisms for producing polyketide. The upper end of the main shaft of the stirring mechanism is connected to a hollow connecting shaft via a coupling. The hollow connecting shaft extends through the upper end face of the tank body and is connected to the upper end face of the tank body via a bearing. A first air inlet pipe with a first check valve at its lower end extends through the hollow connecting shaft out of the tank body. The lower end of the main shaft extends through the lower end face of the tank body via a bearing, and a second air inlet pipe with a second check valve at its upper end extends through the lower port of the main shaft.
[0012] The beneficial effects of this utility model are:
[0013] This invention introduces air inlet pipes into the upper and lower parts of the main shaft in the reactor, and combines the air inlet pipes with the stirring assembly. This allows the gas to be reacted to be directly introduced into the bottom of the liquid to be reacted, ensuring full contact. The cooperation of the upper and lower stirring rods further enhances the gas-liquid mass transfer effect, improves reaction efficiency, and effectively prevents polyketone products from clumping together on the reactor walls.
[0014] The first air inlet pipe above the reactor connects to the upper hollow pipe of the main shaft of the stirring mechanism. The inner cavity of the upper hollow pipe is connected to the inner cavity of the spiral hollow crossbeam. The inner cavity of the hollow crossbeam is fixedly connected to and communicates with the ventilation pipes set on each spiral ribbon stirring blade of the upper stirring rod. Gas is pushed to the bottom of the liquid using nozzles. The second air inlet pipe below the reactor connects to the lower hollow pipe of the main shaft of the stirring mechanism. The inner cavity of the lower hollow pipe is connected to the inner cavity of the upper support crossbeam of the lower stirring rod. The upper support crossbeam has a hollow structure and multiple air outlets are set vertically upward, so that the gas is pushed to the bottom of the liquid. The gaseous raw materials that are not easily soluble in the reaction solvent are transferred to the reaction liquid. Under the action of the upper and lower stirring rods, the gaseous raw materials and the reaction liquid are made into uniform contact, thereby improving the reaction efficiency. At the same time, the generated polyketide can be evenly distributed in the reactor, avoiding local reaction too fast, which would lead to product agglomeration and wall adhesion. Ultimately, the production stability of polyketide is achieved, and the continuity of the production process is greatly improved. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention (section of the tank).
[0016] Figure 2for Figure 1 A cross-sectional view along the AA direction;
[0017] Figure 3 for Figure 1 A cross-sectional view of the I-shaped agitator along the BB direction;
[0018] Figure 4 for Figure 2 A magnified view of a section at point C;
[0019] The components are as follows: 1. Main shaft; 11. Upper hollow tube; 12. Solid tube; 13. Lower hollow tube; 2. Upper stirring rod; 21. First support beam; 22. Second support beam; 23. Hollow beam; 24. Ventilation line; 25. Nozzle; 26. Through hole; 3. Lower stirring rod; 31. Vertical rod; 32. Upper support beam; 33. Lower support beam; 34. Connecting hole; 35. Air outlet; 4. First air inlet pipe; 41. First mechanical seal; 5. First check valve; 6. Second air inlet pipe; 61. Second mechanical seal; 7. Second check valve; 8. Hollow connecting shaft; 81. Coupling; 82. Transmission device; 9. Tank body; 91. Feed inlet; 92. Discharge hole; 10. Motor. Detailed Implementation
[0020] Unless otherwise specified, this utility model is based on Figure 1 The vertical direction of this embodiment is defined by the side of the stirring rod 2 that contacts the hollow crossbeam 23, which is defined as the outer surface of this embodiment.
[0021] As shown in the figure, the stirring mechanism for producing polyketide provided in this embodiment includes a main shaft 1 and a set of upper stirring rods 2 connected to the main shaft 1. The main shaft 1 consists of an upper hollow tube 11, a solid tube 12, and a lower hollow tube 13 from top to bottom. A set of upper stirring rods 2 is connected to the main shaft 1. The upper stirring rods 2 are composed of a set of spiral stirring blades. The upper part of each upper stirring rod 2 is fixedly connected to the first support beam 21, and the lower part of each upper stirring rod 2 is fixedly connected to the second support beam 22. The set of upper stirring rods 1 comprises two sets of spiral ribbon stirring blades, and each set of spiral ribbon stirring blades is symmetrically arranged with the main shaft 1 as the center. The main shaft 1 has a first support beam 21 and a second support beam 22 welded to the positions where the spiral ribbon stirring blades of the upper and lower parts of each upper stirring rod 2 converge in a straight line. The first support beam 21 and the second support beam 22 are fixed to the spiral ribbon stirring blades of the upper and lower parts of each upper stirring rod 2 by welding, thereby ensuring the stability of the upper stirring rod 2.
[0022] The main shaft 1 has at least an upper hollow tube 11 at its upper part. A hollow crossbeam 23, communicating with the upper hollow tube 11, is provided at the lower end of the upper hollow tube 11. At least a portion of the upper stirring rods 2 are connected to the hollow crossbeam 23, and a ventilation line 24, communicating with the hollow crossbeam 23, is provided on the upper stirring rods 2. The ventilation line 24 is provided with a nozzle 25. A first air inlet pipe 4 with a first check valve 5 at its lower end is provided inside the upper hollow tube 11. The hollow crossbeam 23, communicating with the upper hollow tube 11, is fixedly provided at the bottom end of the main shaft 1 by welding. The hollow crossbeam 23 is located at the middle position of each upper stirring rod 2. The spiral stirring blades at the middle position of each upper stirring rod 2 converge on a straight line. The hollow crossbeam 23 overlaps with and is parallel to the straight line of the spiral stirring blades, and is fixedly connected to each spiral stirring blade by welding.
[0023] Ventilation lines 24 are provided on each of the upper stirring rods 2 below the hollow crossbeam 23. That is, each upper stirring rod 2 located on each spiral-shaped stirring blade below the hollow crossbeam 23 is provided with a ventilation line 24. The ventilation line 24 is fixed to the outer surface of the upper stirring rod 2, and the nozzle 25 is located at the end of the ventilation line 24. That is, the ventilation line 24 is set along the outer surface of each spiral-shaped stirring blade and fixed by welding. The upper part of each ventilation line 24 is connected to the through hole 26 left in the hollow crossbeam 23, and the lower end of each ventilation line 24 is provided with a nozzle 25. According to common knowledge, the diameter of the nozzle 25 can be set to 1 / 50-1 / 5 of the diameter of the ventilation line 24. By changing the pipe diameter, the gas flow rate can be effectively increased.
[0024] The upper hollow tube 11 of the main shaft 1 is connected to the first air inlet tube 4. The first air inlet tube 4 passes through the upper hollow tube 11 from top to bottom, and a first check valve 5 is provided at the end of the first air inlet tube 4 located in the upper hollow tube 11 to prevent gas backflow when the air pressure in the upper hollow tube 11 is too high.
[0025] In this embodiment, the main shaft 1 consists of an upper hollow tube 11, a solid tube 12, and a lower hollow tube 13 from top to bottom. A second air inlet pipe 6 extends into the lower hollow tube 13 from its lower end, and a second check valve 7 is installed at the upper end of the second air inlet pipe 6. A lower stirring rod 3 with an air outlet 35 is installed at the lower part of the main shaft 1, and the lower stirring rod 3 is connected to the lower hollow tube 13. The hollow inner cavity of the lower hollow tube 13 has its opening facing downward and is connected to the second air inlet pipe 6. The second air inlet pipe 6 extends into the lower hollow tube 13 from bottom to top, and its connection is sealed by a second mechanical seal 61. A second check valve 7 is installed at the end of the second air inlet pipe 6 located inside the lower hollow tube 13.
[0026] The lower part of the main shaft 1 is provided with a lower stirring rod 3 with an air vent 35. The lower stirring rod 3 is an I-shaped stirring rod, and the upper support crossbar 32 between its two uprights 31 is fixedly connected to the main shaft 1. The upper support crossbar 32 is a hollow tube with an air vent 35 and is connected to the lower hollow tube 13. The lower ends of the two uprights 31 of the I-shaped stirring rod are connected by the lower support crossbar 33. The lower stirring rod 3 is an I-shaped stirring rod, which includes two uprights 31 and an upper support crossbar 32 and a lower support crossbar 33 located between the uprights 31.
[0027] The upper support crossbar 32 is a hollow tube with vent holes 35. It is welded to the top of the inner cavity of the lower hollow tube 13 of the main shaft 1. The inner cavity of the lower hollow tube 13 is connected to the hollow inner cavity of the upper support crossbar 32 by a connecting hole 34. The vent holes 35 are all located above the upper support crossbar 32 and are evenly distributed vertically upward. The number of vent holes 35 does not exceed 6, and the diameter of the vent holes 35 is 5-10mm to ensure that the air outlet has a certain linear velocity, which can facilitate gas-liquid mixing and prevent blockage.
[0028] The lower support crossbar 33 is welded and fixed to the main shaft 1 below the upper support crossbar 32 and is parallel to the upper support crossbar 32; the two uprights 31 are perpendicular to the upper support crossbar 32 and the lower support crossbar 33 respectively, and are welded and fixed to both ends of the upper support crossbar 32 and the lower support crossbar 33 respectively.
[0029] This embodiment also provides a reaction vessel for producing polyketide, including a tank body 9. The tank body 9 houses the aforementioned stirring mechanism for polyketide production. The upper end of the main shaft 1 of the stirring mechanism is connected to a hollow connecting shaft 8 via a coupling 81. The hollow connecting shaft 8 extends through the upper surface of the tank body 9 and is connected to the upper surface of the tank body 9 via a bearing. A first air inlet pipe 4, with a first check valve 5 at its lower end, extends through the hollow connecting shaft 8 out of the tank body 9. The lower end of the main shaft 1 extends through the lower surface of the tank body 9 via a bearing, and a second air inlet pipe 6, with a second check valve 7 at its upper end, extends through the lower port of the main shaft 1. Other parts of the reaction vessel for producing polyketide can refer to existing technology.
[0030] The reactor vessel 9 has a feed inlet 91 on one side of its upper end and a discharge outlet 92 on one side of its lower center. A hollow connecting shaft 8 is provided at the upper center of the vessel 9, passing through the vessel 9 and rotating with a bearing. The lower end of the hollow connecting shaft 8 inside the vessel 9 is connected to the upper hollow tube 11 of the main shaft 1 via a coupling 81, which facilitates the installation and replacement of the stirring mechanism.
[0031] In this embodiment, the hollow inner cavity of the hollow connecting shaft 8 is connected at both ends, and its diameter is larger than that of the first air inlet pipe 4. The outer wall of the upper port of the hollow connecting shaft 8, which protrudes from the upper end face of the tank body 9, is fitted with a transmission device 82, and the first air inlet pipe 4 extends into the upper port of the hollow connecting shaft 8, and the docking point is sealed by a first mechanical seal 41.
[0032] The main shaft 1 extends through the lower end of the lower stirring rod 3 through the lower end face of the reactor body 9, and rotates with the tank body 9 through a bearing to ensure a seal. The second air inlet pipe 6 extends from the lower port of the lower hollow pipe 13 of the main shaft 1 that extends through the tank body 9, and the docking point is sealed by the second mechanical seal 61.
[0033] In this embodiment, the stirring mechanism is installed in the reaction vessel, and the transmission device 82 is driven by the motor 10, which in turn drives the hollow connecting shaft 8, that is, the main shaft 1 fixedly connected to the hollow connecting shaft 8, and introduces gas into the first air inlet pipe 4 and the second air inlet pipe 6, thereby starting the operation of this embodiment. Structures not specifically described in this embodiment are all prior art and will not be elaborated upon here.
Claims
1. A stirring mechanism for producing polyketide, comprising a main shaft and a set of upper stirring rods connected to the main shaft, characterized in that: The main shaft is at least upper part of an upper hollow tube, and a hollow crossbeam connected to the upper hollow tube is provided at the lower end of the upper hollow tube. At least part of the upper stirring rod is connected to the hollow crossbeam, and a venting line connected to the hollow crossbeam is provided on the upper stirring rod. The venting line is provided with an air outlet. A first air inlet pipe with a first check valve at the lower end is provided inside the upper hollow tube. The main shaft consists of an upper hollow tube, a solid tube and a lower hollow tube from top to bottom. A second air inlet pipe extending into the lower hollow tube from the lower end is provided inside the lower hollow tube. A second check valve is provided at the upper end of the second air inlet pipe. A lower stirring rod with an air outlet is provided at the lower part of the main shaft. The lower stirring rod is connected to the lower hollow tube.
2. The stirring mechanism for producing polyketide according to claim 1, characterized in that: The lower stirring rod is an I-shaped stirring rod, with the upper support crossbar between its two uprights fixedly connected to the main shaft. The upper support rod is a hollow tube with an air vent, and the upper support rod is connected to the lower hollow tube.
3. The stirring mechanism for producing polyketide according to claim 2, characterized in that: The lower ends of the two uprights of the I-shaped stirring rod are connected by a lower support crossbar.
4. The stirring mechanism for producing polyketide according to claim 1, 2, or 3, characterized in that: The upper stirring rod consists of a set of spiral stirring blades. The middle position of each upper stirring rod is connected to the hollow crossbeam. Each upper stirring rod below the hollow crossbeam is equipped with a ventilation pipe. The upper part of each upper stirring rod is fixedly connected to the first support crossbeam, and the lower part of each upper stirring rod is fixedly connected to the second support crossbeam.
5. The stirring mechanism for producing polyketide according to claim 4, characterized in that: The venting line is fixed to the outer surface of the upper stirring rod, and the vent is located at the end of the venting line.
6. A reaction vessel for producing polyketide, comprising its tank body, characterized in that: The tank is equipped with any of the stirring mechanisms for producing polyketide as described in claims 1 to 5. The upper end of the main shaft of the stirring mechanism for producing polyketide is connected to a hollow connecting shaft via a coupling. The hollow connecting shaft extends out from the upper end face of the tank and is connected to the upper end face of the tank via a bearing. The lower end of the main shaft has a first air inlet pipe with a first check valve extending out of the tank via the hollow connecting shaft. The lower end of the main shaft extends out from the lower end face of the tank via a bearing, and the upper end of the main shaft has a second air inlet pipe with a second check valve extending out from the lower port of the main shaft.