Static devolatilization reaction kettle

Abstract

The utility model discloses a static devolatilization reaction kettle which comprises a kettle body, the upper end of the kettle body is connected with a feeding end cover, and a feeding channel is arranged on the feeding end cover; the lower end of the kettle body is connected with a discharging hopper, and a vacuum cavity is formed in the kettle body; the lower part of the feeding end cover is connected with a distribution plate; the distribution plate is connected with a plurality of dispersion pipes extending into the vacuum cavity; a first chamber communicated with the vacuum cavity and the feeding channel is arranged in the middle of the dispersing pipe; a second chamber surrounds the outer side of the first chamber, the upper end of the second chamber is communicated with the feeding channel, and the lower end of the second chamber is closed; a plurality of first through holes communicated with the vacuum cavity are formed in the outer side of the second cavity; a plurality of second through holes communicated with the first cavity are formed in the inner side of the second cavity. According to the utility model, the melt can be orderly subjected to film formation on the dispersion pipe and can slide on the pipe wall due to gravity, so that the film formation time and area are increased, and the devolatilization quality is ensured.

Description

Technical Field

[0001] This utility model relates to a static devolatilization reactor, belonging to the field of chemical equipment technology. Background Technology

[0002] In many industrial production fields such as chemical engineering and polymer materials, devolatilization is a crucial process. The devolatilization reactor, as the core equipment for this process, directly impacts product quality and production efficiency. Currently, commonly used devolatilization reactors mainly fall into two categories: those with disc agitators and those with squirrel-cage agitators. Reactors with disc agitators suffer from low production efficiency due to their disc structure, resulting in a smaller film formation and evaporation area. Furthermore, the disc obstructs the melt, hindering its flow. To improve this, a high liquid level and increased stirring speed are often necessary, but this leads to excessively long melt residence times, causing instability and ultimately reducing product quality. While reactors with squirrel-cage agitators offer larger film formation and evaporation areas, improving efficiency to some extent, their inherent characteristics cause significant material buildup on the cage surface, especially for high-viscosity melts. The material adheres to the cage and is difficult to remove, effectively covering the entire agitator and reducing the evaporation area and efficiency. Over time, the deposited melt will degrade and fall off, severely affecting product quality and increasing its instability. Furthermore, both of the aforementioned reactor types require a driving mechanism for devolatilization. To address this, the industry has developed static devolatilization reactors. For example, Chinese utility model patent CN218742004U discloses a multi-stage devolatilization reactor, specifically including a distributor installed on the inner wall of the reactor and a homogenizer located below the distributor. The distributor has a distribution ball at its center on its upper surface, several sets of annularly arranged dividing strips on its upper surface, and several sets of distribution holes on its surface. The homogenizer is hollow and has a first feed pipe penetrating its surface. Three sets of inclined devolatilizers are located on the lower part of the inner wall of the reactor, and a second feed pipe penetrating the devolatilizer's surface. In this reactor, the melt cannot effectively form a film, preventing volatile substances from diffusing from the melt interior to the surface and evaporating, resulting in incomplete devolatilization. Utility Model Content

[0003] The purpose of this invention is to provide a static devolatilization reactor. This invention allows the melt to form an orderly film on the dispersion tube and slides along the tube wall due to gravity, increasing the film formation time and area, thus ensuring the quality of devolatilization.

[0004] The technical solution of this utility model is as follows: A static devolatilization reactor includes a reactor body, an inlet end cover connected to the upper end of the reactor body, and an inlet channel provided on the inlet end cover; an outlet hopper connected to the lower end of the reactor body, and a vacuum chamber inside the reactor body; a distribution plate connected below the inlet end cover, and multiple dispersion tubes extending into the vacuum chamber connected to the distribution plate; a first chamber connected to the vacuum chamber and the inlet channel is provided in the middle of the dispersion tubes; a second chamber surrounds the outer side of the first chamber, the upper end of the second chamber is connected to the inlet channel, and the lower end of the second chamber is closed; multiple first through holes communicating with the vacuum chamber are provided on the outer side of the second chamber; multiple second through holes communicating with the first chamber are provided on the inner side of the second chamber.

[0005] The aforementioned static devolatilization reactor has a heating mechanism encased on the side of the reactor body; the heating mechanism includes a jacket disposed outside the reactor body and the discharge hopper, with a heating chamber between the jacket and the reactor body and the discharge hopper; a heating carrier inlet is provided below the jacket; and a heating carrier outlet is provided above the jacket.

[0006] In the aforementioned static devolatilization reactor, a plurality of first threaded holes are distributed circumferentially below the feed end cover; a plurality of countersunk holes are distributed circumferentially on the distribution plate, and the countersunk holes correspond to the first threaded holes.

[0007] In the aforementioned static devolatilization reactor, the distribution plate is provided with multiple distribution mechanisms, and the dispersion tube is connected to the feed channel through the distribution mechanisms.

[0008] In the aforementioned static devolatilization reactor, the distribution mechanism includes a second threaded hole, and a plurality of third through holes are distributed circumferentially on the side of the second threaded hole; the first chamber communicates with the second threaded hole, and the second chamber communicates with the third through holes.

[0009] In the aforementioned static devolatilization reactor, the upper end of the dispersion tube is provided with a threaded column, which mates with a second threaded hole; the upper end of the dispersion tube is provided with multiple fourth through holes that communicate with the second chamber, and the fourth through holes correspond to the third through holes; the threaded column is provided with a fifth through hole that communicates with the first chamber.

[0010] In the aforementioned static devolatilization reactor, a first sealing gasket is provided between the feed end cover and the distribution plate; a second sealing gasket is provided between the feed end cover and the reactor body.

[0011] The aforementioned static devolatilization reactor includes a feed inlet located on the upper side of the reactor body and a guide channel located inside the feed end cover, with the guide channel connected to the feed inlet.

[0012] The aforementioned static devolatilization reactor has an exhaust port on the side of the reactor body that communicates with the vacuum chamber; and a discharge port is provided below the discharge hopper.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. In this invention, the melt flows from the feed channel to the distribution plate. After passing through the distribution plate, the melt enters the first and second chambers within the dispersion tube. The melt adheres to the side walls of the first and second chambers and flows downwards due to gravity, increasing the film-forming area and extending the film-forming time. During the flow, the melt flows through the first and second through holes, allowing it to form an orderly film along the tube wall. This results in a more uniform distribution of the melt throughout the flow, avoiding local accumulation or poor flow, thereby greatly enhancing product stability. Thus, this invention achieves the effect of orderly film formation on the dispersion tube and allows the melt to slide along the tube wall due to gravity, increasing the film-forming time and area, resulting in excellent devolatilization performance.

[0015] 2. In this invention, the heating carrier is introduced into the heating chamber through the heating carrier inlet of the heating mechanism. The heating carrier then conducts heat to the vacuum chamber inside the vessel. Because the heating carrier inlet is located at the bottom and the heating carrier outlet at the top, the heating carrier flows from bottom to top within the heating chamber, ensuring full contact between the heating carrier and the vessel body, achieving efficient heat transfer. This flow pattern allows the heating carrier sufficient residence time within the heating chamber to fully release the heat it carries, improving energy utilization efficiency. When the heating carrier reaches the heating carrier outlet at the top, the heat it carries has been largely transferred to the vessel body, and it then flows out of the heating chamber, reducing heat waste. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the distribution plate structure;

[0018] Figure 3 This is a schematic diagram of the dispersion tube.

[0019] The labels in the attached diagram are as follows: 1-Cessel body, 2-Feed end cover, 3-Feed inlet, 4-Guide channel, 5-Discharge hopper, 6-Vacuum chamber, 7-Ejection port, 8-Discharge port, 9-Distribution plate, 10-Distribution mechanism, 11-Dispersion tube, 12-First chamber, 13-Second chamber, 14-First through hole, 15-Second through hole, 16-Heating mechanism, 17-First threaded hole, 18-Counterhole, 19-Feed channel, 20-Jacket, 21-Heating chamber, 22-Heating carrier inlet, 23-Heating carrier outlet, 30-Second threaded hole, 31-Third through hole, 32-Threaded column, 33-Fourth through hole, 34-Fifth through hole, 40-First sealing gasket, 41-Second sealing gasket. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0021] Example: A static devolatilization reactor, configured as follows Figure 1-3 As shown, the apparatus includes a vessel body 1, with a feed end cover 2 connected to the upper end of the vessel body 1. The feed end cover 2 has a feed channel 19. A discharge hopper 5 is connected to the lower end of the vessel body 1, its shape being wider at the top and narrower at the bottom to facilitate the collection and outflow of the melt. The vessel body 1 has a vacuum chamber 6 inside. A distribution plate 9 is connected below the feed end cover 2, and multiple dispersion tubes 11 extending into the vacuum chamber 6 are connected to the distribution plate 9. A first chamber 12, communicating with the vacuum chamber 6 and the feed channel 19, is located in the middle of each dispersion tube 11. The first chamber 12 is surrounded by a second chamber 13. The upper end of the second chamber 13 is connected to the feed channel 19, and the lower end of the second chamber 13 is closed. The outer side of the second chamber 13 is provided with a plurality of first through holes 14 communicating with the vacuum chamber 6, so that volatile impurities can enter the vacuum chamber 6 from the second chamber 13. The inner side of the second chamber 13 is provided with a plurality of second through holes 15 communicating with the first chamber 12, so that the melt can flow between the first chamber 12 and the second chamber 13, further enhancing the devolatilization effect.

[0022] Preferably, such as Figure 1 As shown, a heating mechanism 16 is wrapped around the side of the vessel body 1. The heating mechanism 16 includes a jacket 20 disposed outside the vessel body 1 and the discharge hopper 5, with a heating chamber 21 between the jacket 20 and the vessel body 1 and the discharge hopper 5. A heating carrier inlet 22 is provided below the jacket 20, and a heating carrier outlet 23 is provided above the jacket 20. The heating carrier is heated into the heating chamber 21 through the heating carrier inlet 22 of the heating mechanism 16, and the heating carrier conducts heat to the vacuum chamber 6 inside the vessel body 1. Because the heating carrier inlet 22 is located at the bottom and the heating carrier outlet 23 is at the top, the heating carrier flows from bottom to top in the heating chamber 21, ensuring full contact between the heating carrier and the vessel body 1, achieving efficient heat transfer. This flow pattern allows the heating carrier to have sufficient residence time in the heating chamber 21, fully releasing the heat it carries and improving energy utilization efficiency. When the heating carrier reaches the heating carrier outlet 23 at the top, the heat it carries has been basically fully transferred to the vessel body 1, and then it flows out of the heating chamber 21, reducing heat waste.

[0023] Preferably, such as Figure 1 and 2As shown, a plurality of first threaded holes 17 are distributed circumferentially below the feed end cover; a plurality of countersunk holes 18 are distributed circumferentially on the distribution plate 9, the countersunk holes 18 corresponding to the first threaded holes 17. The distribution plate 9 is placed below the feed end cover 2, and the countersunk holes 18 are aligned with the first threaded holes 17. Then, the bolts are screwed in from below the countersunk holes 18 and their threaded ends are screwed into the first threaded holes 17, so that the distribution plate 9 is fixed to the feed end cover 2.

[0024] Preferably, such as Figure 2 As shown, the distribution plate 9 is provided with multiple distribution mechanisms 10, and the dispersion tube 11 is connected to the feed channel 19 via the distribution mechanism 10. The function of the distribution mechanism 10 is to distribute the melt flowing in from the guide channel 4 into each dispersion tube 11, ensuring the uniformity and efficiency of the devolatilization process. The distribution mechanism 10 includes a second threaded hole 30, and multiple third through holes 31 are distributed circumferentially on the side of the second threaded hole 30; the first chamber 12 is connected to the second threaded hole 30, and the second chamber 13 is connected to the third through holes 31. The upper end of the dispersion tube 11 is provided with a threaded post 32, which cooperates with the second threaded hole 30; the upper end of the dispersion tube 11 is provided with multiple fourth through holes 33 connected to the second chamber 13, and the fourth through holes 33 correspond to the third through holes 31; the threaded post 32 is provided with a fifth through hole 34 connected to the first chamber 12. By screwing the threaded post 32 of the dispersion tube 11 into the second threaded hole 30 of the distribution plate 9, the dispersion tube 11 is connected and fixed to the distribution plate 9. The melt falling on the distribution plate 9 will flow into the second chamber 13 through the third through hole 31 and the fourth through hole 33 in sequence, and at the same time, it will flow into the first chamber 12 through the fifth through hole 34 at the upper end of the threaded post 32. This is beneficial to increase the distribution area and film formation time of the melt and improve the devolatilization efficiency.

[0025] Preferably, such as Figure 1 As shown, a first sealing gasket 40 is provided between the feed end cap 2 and the distribution plate 9; a second sealing gasket 41 is provided between the feed end cap 2 and the vessel body 1. The first sealing gasket 40 strengthens the connection and sealing between the feed end cap 2 and the distribution plate 9, preventing the melt from flowing out from the gap between them; the second sealing gasket 41 strengthens the connection and sealing between the end cap and the vessel body 1, preventing the heating carrier from flowing in from the gap between them.

[0026] Preferably, such as Figure 1 As shown, the feed channel 19 includes a feed inlet 3 located on the upper side of the reactor body 1 and a guide channel 4 located inside the feed end cover 2, the guide channel 4 being connected to the feed inlet 3. The feed inlet 3 is used to introduce the melt to be devolatilized into the reactor; the inner wall of the guide channel 4 is polished, with a smooth surface, which reduces the resistance to melt flow and allows the melt to flow more efficiently to subsequent components.

[0027] Preferably, such as Figure 1As shown, the side of the reactor body 1 is provided with an exhaust port 7 that is connected to the vacuum chamber 6. The exhaust port 7 is connected to a vacuum pump and other exhaust equipment. The volatile impurities in the vacuum chamber 6 can be extracted by the exhaust operation. The discharge hopper 5 is provided with a discharge port 8 below it. The melt after the devolatilization treatment is discharged from the reactor through the discharge port 8.

[0028] Working principle:

[0029] Melt feeding and distribution: The melt to be devolatilized enters the reactor through the feed port 3 on the upper side of the reactor body 1, and then flows through the guide channel 4 inside the feed end cover 2 to the distribution plate 9. Multiple distribution mechanisms 10 on the distribution plate 9 function to distribute the melt into each dispersion tube 11. Among them, a part of the melt enters the first chamber 12 of the dispersion tube 11 through the distribution mechanism 10, and another part enters multiple second chambers 13 surrounding the first chamber 12.

[0030] Melt Film Formation and Flow: After entering the first chamber 12 and the second chamber 13, the melt adheres to the sidewalls of the corresponding chambers. Due to gravity, the melt begins to flow downwards. During this process, a thin film forms on the sidewalls, which greatly increases the film formation area and prolongs the film formation time. A larger film formation area means a larger contact area between the melt and the gas phase, creating more favorable conditions for subsequent devolatilization operations. As the melt flows downwards, it flows between the inside and outside of the second chamber 13 through the first through-hole 14, and between the first chamber 12 and the second chamber 13 through the second through-hole 15. This flow pattern allows the melt to form an orderly film along the pipe wall, ensuring a more uniform distribution of the melt throughout the flow process, avoiding local accumulation or poor flow, and thus significantly enhancing product stability.

[0031] Deviation Process: While the melt forms a film and flows, a heating carrier (such as heat transfer oil) is introduced into the heating chamber 21 through the heating carrier inlet 22. Since the heating carrier inlet 22 is at the bottom and the heating carrier outlet 23 is at the top, the heating carrier flows upwards within the heating chamber 21. This flow pattern ensures full contact between the heating carrier and the reactor body 1, efficiently transferring heat to the vacuum chamber 6 within the reactor body 1, maintaining a high and stable temperature in the vacuum chamber 6. Under high-temperature conditions, impurity molecules in the melt gain sufficient energy and volatilize from the melt. At this time, the evacuation port 7, connected to the vacuum chamber 6, continuously evacuates air, promptly discharging the volatilized impurities from the reactor, ensuring the smooth progress of the devolatilization process. After thorough devolatilization, the melt continues to slide downwards, eventually falling into the discharge hopper 5 and being discharged from the discharge port 8. Thus, the entire devolatilization process is complete.

Claims

1. A static devolatilization reactor, comprising a reactor body (1), an inlet end cap (2) connected to the upper end of the reactor body (1), and an inlet channel (19) provided on the inlet end cap (2); an outlet hopper (5) connected to the lower end of the reactor body (1), and a vacuum chamber (6) inside the reactor body (1); characterized in that: A distribution plate (9) is connected below the feed end cap (2), and multiple dispersion tubes (11) extending into the vacuum chamber (6) are connected to the distribution plate (9); a first chamber (12) connected to the vacuum chamber (6) and the feed channel (19) is provided in the middle of the dispersion tube (11); a second chamber (13) is surrounded on the outside of the first chamber (12), the upper end of the second chamber (13) is connected to the feed channel (19), and the lower end of the second chamber (13) is closed; multiple first through holes (14) connected to the vacuum chamber (6) are provided on the outside of the second chamber (13); multiple second through holes (15) connected to the first chamber (12) are provided on the inside of the second chamber (13).

2. The static devolatilization reactor according to claim 1, characterized in that: The side of the vessel body (1) is covered with a heating mechanism (16); the heating mechanism (16) includes a jacket (20) disposed outside the vessel body (1) and the discharge hopper (5), and a heating chamber (21) is provided between the jacket (20) and the vessel body (1) and the discharge hopper (5); a heating carrier inlet (22) is provided below the jacket (20); and a heating carrier outlet (23) is provided above the jacket (20).

3. The static devolatilization reactor according to claim 1, characterized in that: The feed end cap (2) has a plurality of first threaded holes (17) distributed around its lower circumference; the distribution plate (9) has a plurality of countersunk holes (18) distributed around its circumference, the countersunk holes (18) corresponding to the first threaded holes (17).

4. The static devolatilization reactor according to claim 1, characterized in that: The distribution plate (9) is provided with multiple distribution mechanisms (10), and the dispersion tube (11) is connected to the feed channel (19) through the distribution mechanism (10).

5. The static devolatilization reactor according to claim 4, characterized in that: The dispensing mechanism (10) includes a second threaded hole (30), and a plurality of third through holes (31) are distributed around the side of the second threaded hole (30); the first chamber (12) communicates with the second threaded hole (30), and the second chamber (13) communicates with the third through holes (31).

6. The static devolatilization reactor according to claim 5, characterized in that: The upper end of the dispersion tube (11) is provided with a threaded post (32), which is engaged with the second threaded hole (30); the upper end of the dispersion tube (11) is provided with a plurality of fourth through holes (33) that are connected to the second chamber (13), and the fourth through holes (33) are corresponding to the third through holes (31); the threaded post (32) is provided with a fifth through hole (34) that is connected to the first chamber (12).

7. The static devolatilization reactor according to claim 1, characterized in that: A first sealing gasket (40) is provided between the feed end cover (2) and the distribution plate (9); a second sealing gasket (41) is provided between the feed end cover (2) and the vessel body (1).

8. The static devolatilization reactor according to claim 1, characterized in that: The feeding channel (19) includes a feeding port (3) located on the upper side of the vessel body (1) and a guiding channel (4) located inside the feeding end cover (2), with the guiding channel (4) connected to the feeding port (3).

9. The static devolatilization reactor according to claim 1, characterized in that: The side of the vessel body (1) is provided with an air extraction port (7) that communicates with the vacuum chamber (6); the bottom of the discharge hopper (5) is provided with a discharge port (8).

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