2-vinylpyridine rectification device

Abstract

The utility model relates to the technical field of rectification equipment, and discloses a 2-vinylpyridine rectification device, which comprises a rectification tower main body and a feed pipe fixedly connected inside the rectification tower main body, the output end of the feed pipe is fixedly connected with a fixed pipe, and the outer surface of the fixed pipe is fixedly connected with a spray head. By means of the annular disc capable of sliding in the inner cavity, when materials do not need to be sprayed out, due to the strong pressure in the sealing groove, the annular disc can be driven by the sealing disc and the fixing rod to slide downwards, the inserting rod is inserted into the spraying hole, and in the intermittent period of equipment operation, the annular disc is driven by the strong pressure in the sealing groove to slide downwards; the plunger is inserted into the spray hole, polymer particles, insoluble impurities and crystals which are possibly blocked in the spray hole can be effectively removed, and the cleaning mode can be used for timely cleaning before spraying each time, so that uneven feeding caused by blockage is avoided, and good gas-liquid contact and high-efficiency rectification operation are maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of distillation equipment, and more specifically to a 2-vinylpyridine distillation device. Background Art

[0002] A distillation tower is a chemical equipment used to separate and purify 2-vinylpyridine. It utilizes the difference in volatility of the components in the mixture to perform multiple partial vaporizations and partial condensations within the distillation tower, transferring the light components (low-boiling substances) in the liquid phase to the gas phase, while the heavy components (high-boiling substances) in the gas phase are transferred to the liquid phase. A high-purity 2-vinylpyridine product is obtained at the top of the tower, and the heavy component impurities are discharged at the bottom of the tower.

[0003] A nozzle is usually installed at the output end of the feed pipe of a traditional distillation tower to evenly disperse the material into the distillation tower, ensuring good gas-liquid contact and mass and heat transfer during the distillation process. However, during the distillation of 2-vinylpyridine, the nozzle is easily clogged by sediment, which has a negative impact on the distillation operation.

[0004] The main sources of precipitates that clog the nozzles are the following: First, 2-vinylpyridine molecules contain unsaturated double bonds. During the distillation process, especially at high temperatures and in the presence of initiator or catalyst residues, self-polymerization is likely to occur. As the reaction proceeds, the polymer molecular chains gradually grow, eventually forming larger polymer particles. These particles tend to aggregate at the nozzles and clog the nozzles. Second, the raw materials may be mixed with some insoluble impurities, such as metal salts, dust particles, and unreacted solid reactants. During the distillation process, as the liquid flows and evaporates, the concentration of these impurities at the nozzles continues to increase. When their solubility in the liquid phase exceeds their solubility, they precipitate and clog the nozzles. In addition, if 2-vinylpyridine contains certain components with low melting points or whose solubility is significantly affected by temperature, the temperature changes at the nozzles during the distillation process may cause these components to reach a supersaturated state, resulting in crystallization and precipitation, which can clog the nozzles. For example, when the top temperature of the tower is low, some high-boiling-point impurities may crystallize at the nozzles.

[0005] Once the nozzle is clogged, the feed cannot be evenly distributed in the distillation tower, resulting in insufficient contact between the gas and liquid phases. This will cause some tower plates or packings to fail to fully play their mass transfer and heat transfer functions, greatly reducing the separation effect of the distillation process. The product purity is difficult to meet the expected requirements, seriously affecting the normal operation and production efficiency of the distillation tower. Utility Model Content

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a 2-vinylpyridine distillation device to solve the problems existing in the above-mentioned background technology.

[0007] The utility model provides the following technical solution: a 2-vinylpyridine distillation device, comprising a distillation tower body and a feed pipe fixedly connected to the inside of the distillation tower body, the output end of the feed pipe is fixedly connected to a fixed pipe, the output end of the fixed pipe is fixedly connected to a nozzle, the bottom of the nozzle is equidistantly provided with spray holes, the interior of the nozzle is provided with an inner cavity, the inner sealing sliding connection of an annular disk is provided, the bottom of the annular disk is equidistantly fixed with a plug rod, the inner wall of the annular disk is fixedly connected with a silicone sealing ring, the top of the annular disk is equidistantly fixed with a fixing rod, the top of the fixing rod is fixedly connected with a sealing disk, the top of the inner cavity is equidistantly provided with sealing grooves, the sealing grooves are connected, the sealing disk is sealingly slidably connected to the inside of the sealing groove, the interior of the nozzle is fixedly connected with a ventilation pipe connected to the inside of the sealing groove, the input end of the ventilation pipe is fixedly connected with an inflation valve, and a pressure gauge is fixedly installed on the ventilation pipe.

[0008] Furthermore, the outer surface of the plug passes through the spray hole and extends to the bottom of the nozzle, and the end of the plug is tapered.

[0009] Furthermore, a sealing ring is fixedly mounted on the outer surface of the annular disk, and the outer surface of the annular disk is sealingly and slidingly connected to the interior of the inner cavity via the sealing ring.

[0010] Furthermore, the inner wall of the silicone sealing ring is sealed and adhered to the outer surface of the fixed tube, and the annular disk is sealingly and slidingly connected to the outer surface of the fixed tube through the silicone sealing ring.

[0011] Furthermore, the bottom end of the fixed tube extends to the lower side of the annular disk.

[0012] Furthermore, the diameter of the top of the inner cavity is larger than the diameter of the bottom, and the diameter of the annular disk is equal to the diameter of the top of the inner cavity.

[0013] Technical effects and advantages of this utility model:

[0014] 1. The utility model uses an annular disk that can slide inside the inner cavity. When there is no need to spray out materials, the strong pressure inside the sealing groove can drive the annular disk to slide downward through the sealing disk and the fixed rod, and insert the insert rod into the spray hole. During the intermittent period of equipment operation, the annular disk is driven down by the strong pressure inside the sealing groove, allowing the insert rod to be inserted into the spray hole, which can effectively remove polymer particles, insoluble impurities and crystals that may be blocked in the spray hole. In addition, this cleaning method can be used for timely cleaning before each spraying to avoid uneven feeding due to blockage, maintain good contact between gas and liquid and efficient operation of distillation.

[0015] 2. The utility model, by arranging a pressure gauge and an inflation valve, can flexibly control the internal pressure of the sealing groove according to the size of the feed amount of the feed pipe, thereby avoiding the disadvantages of excessive pressure inside the sealing groove and a small amount of material entering the feed pipe, which leads to a small sliding range of the annular disk, thereby enhancing flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 This is a schematic diagram of the connection between the feed pipe, fixed pipe and nozzle in the utility model;

[0019] Figure 4 It is a cross-sectional view of the nozzle in the utility model;

[0020] Figure 5 This is a schematic diagram of the connection between the nozzle and the plug in the utility model.

[0021] The accompanying drawings are marked as follows: 1. distillation tower body; 2. feed pipe; 3. fixed pipe; 4. nozzle; 5. spray hole; 6. inner cavity; 7. annular disk; 8. silicone sealing ring; 9. plug rod; 10. fixed rod; 11. sealing disk; 12. sealing groove; 13. vent pipe; 14. pressure gauge; 15. inflation valve. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with specific embodiments. However, people familiar with the art should understand that the detailed description given here in conjunction with the drawings is for better explanation, and the structure of the present invention must go beyond these limited embodiments. For some equivalent replacement solutions or common means, they will not be described in detail herein, but they still fall within the scope of protection of this application.

[0023] Figure 1-Figure 5 This is the best embodiment of the present invention, Figure 1-Figure 5 The utility model is further described.

[0024] Refer to the attached Figure 1-Figure 5Specifically, a 2-vinylpyridine distillation device includes a distillation tower body 1 and a feed pipe 2 fixedly connected to the inside of the distillation tower body 1, the output end of the feed pipe 2 is fixedly connected to a fixed pipe 3, the output end of the fixed pipe 3 is fixedly connected to a nozzle 4, the bottom of the nozzle 4 is equidistantly provided with spray holes 5, the interior of the nozzle 4 is provided with an inner cavity 6, the input end of the spray hole 5 is connected to the inner cavity 6, the inner cavity 6 is a stepped shape with an upper diameter larger than a lower diameter, the inner cavity 6 is sealed and slidably connected with an annular disk 7, the annular disk 7 is located in the large end of the inner cavity 6, and the inner cavity 6 is provided with a plurality of nozzle holes 5, and the nozzle hole 5 is connected to the inner cavity 6. The cavity 6 is divided into an upper chamber and a lower chamber. A plurality of plug rods 9 are fixedly connected to the bottom of the annular disk 7 at equal intervals. The diameter of the plug rod 9 is equal to the diameter of the nozzle hole 5, and the length of the plug rod 9 is greater than the length of the nozzle hole 5. A silicone sealing ring 8 is fixedly connected to the inner wall of the annular disk 7. The output end of the fixed tube 3 extends into the annular disk 7. The silicone sealing ring 8 is sleeved on the output end of the fixed tube 3. The output end of the fixed tube 3 is connected to the inner cavity 6 on the lower side of the annular disk 7. The inner wall of the silicone sealing ring 8 is sealed and fitted on the outer wall of the fixed tube 3. The silicone sealing ring 8 is sealed and slidably connected to the fixed tube 3. Outside the tube 3, the top of the annular disk 7 is equidistantly fixedly connected with a fixing rod 10, the top of the fixing rod 10 is fixedly connected with a sealing disk 11, and the top of the inner cavity 6 is equidistantly provided with a sealing groove 12. The multiple sealing grooves 12 are interconnected through the connecting holes provided in the nozzle 4 to ensure that the internal pressure of each sealing groove 12 is equal. The sealing disk 11 is sealingly slidably connected to the inside of the sealing groove 12. The inside of the nozzle 4 is fixedly connected with a vent pipe 13 connected to the inside of the sealing groove 12. One end of the vent pipe 13 is connected to the sealing groove 12 on the upper side of the sealing disk 11, and the ventilation The other end of the tube 13 is fixedly connected to an inflation valve 15, and a pressure gauge 14 is installed on the vent pipe 13, and the pressure gauge 14 is installed on the feed pipe 2. The vent pipe 13 is fixedly connected to the inside of the distillation tower body 1 and extends to the outside of the distillation tower body 1. By arranging the pressure gauge 14 and the inflation valve 15, the internal pressure of the sealing groove 12 can be flexibly controlled according to the size of the feed amount of the feed pipe 2, thereby avoiding the disadvantage that the internal pressure of the sealing groove 12 is too high, resulting in a small sliding range of the annular disk 7 and a small amount of material entering the feed pipe 2, thereby enhancing flexibility.

[0025] In this embodiment, the annular disk 7 is a ring made of polytetrafluoroethylene, and the sealing disk 11 is a disk made of polytetrafluoroethylene.

[0026] In order to facilitate the installation of the annular disk 7, the nozzle 4 is a split structure.

[0027] In this embodiment, through the annular disk 7 that can slide inside the inner cavity 6, when there is no need to spray out the material, the strong pressure inside the sealing groove 12 can drive the annular disk 7 to slide downward through the sealing disk 11 and the fixed rod 10, and insert the rod 9 into the spray hole 5. During the intermittent period of equipment operation, the annular disk 7 is driven down by the strong pressure inside the sealing groove 12, allowing the rod 9 to be inserted into the spray hole 5, which can effectively remove polymer particles, insoluble impurities and crystals that may be blocked in the spray hole 5. In addition, this cleaning method can be used for timely cleaning before each spraying to avoid uneven feeding due to blockage, maintain good contact between gas and liquid and efficient operation of distillation.

[0028] Specifically, the outer surface of the plunger 9 passes through the spray hole 5 and extends to the bottom of the nozzle 4, and the end of the plunger 9 is tapered.

[0029] In this embodiment, when there is no pressure inside the inner cavity 6, the strong pressure inside the sealing groove 12 causes the sealing disk 11 and the fixing rod 10 to drive the annular disk 7 to slide downward. Since the outer surface of the insertion rod 9 passes through the spray hole 5 and extends to the bottom of the nozzle 4, the debris blocked inside the spray hole 5 can be completely removed.

[0030] Specifically, a sealing ring is fixedly mounted on the outer surface of the annular disk 7 , and the outer surface of the annular disk 7 is sealingly and slidingly connected to the interior of the inner cavity 6 via the sealing ring.

[0031] In this embodiment, the annular disk 7 is sealed and slidably connected to the interior of the inner cavity 6, thereby preventing high-pressure liquid from entering the inner cavity 6 above the annular disk 7. This ensures that, when the pressure is constant, the annular disk 7 can slide within a certain range, thereby ensuring a stable output of liquid from the nozzle hole 5. In fact, simply separating the rod 9 from the nozzle hole 5 ensures that the liquid material can be sprayed through the nozzle hole.

[0032] Specifically, the inner wall of the silicone sealing ring 8 is sealed and adhered to the outer surface of the fixed tube 3 , and the annular disk 7 is sealingly and slidingly connected to the outer surface of the fixed tube 3 through the silicone sealing ring 8 .

[0033] In this embodiment, by providing a silicone sealing ring 8, the sealing of the upper chamber of the inner cavity 6 can be ensured when the annular disk 7 slides, and the elasticity of the silicone sealing ring 8 can ensure a close fit with the fixed tube 3, further enhancing the sealing.

[0034] Specifically, the bottom end of the fixed tube 3 extends to the lower surface of the annular disk 7 .

[0035] In this embodiment, since the bottom end of the fixed tube 3 extends to the lower side of the annular disk 7, when the high-pressure liquid enters the inner cavity through the feed tube 2 and the fixed tube 3, it can only drive the annular disk 7 to slide upward. At the same time, when the annular disk 7 slides down to the bottom end, it can also prevent the liquid in the lower chamber of the inner cavity 6 from entering the upper chamber of the inner cavity 6.

[0036] Specifically, the diameter of the top of the inner cavity 6 is larger than the diameter of the bottom, and the diameter of the annular disk 7 is equal to the diameter of the top of the inner cavity 6 .

[0037] In this embodiment, since the top diameter of the inner cavity 6 is larger than the bottom diameter, when the material feeding is stopped, due to the strong pressure inside the sealing groove 12, the sealing disk 11 is driven to slide downward through the fixed rod 10, and the large-diameter bottom wall of the inner cavity 6 fits with the shoulder of the annular disk 7, which can limit the annular disk 7.

[0038] The working principle and use process of the present invention are as follows: when in use, after the feed pipe 2 is connected to the external feed pipe through the flange, the water pump connected to the external feed pipe is started, and the high-pressure liquid material is input into the fixed pipe 3 through the feed pipe 2, and then enters the inner cavity 6 through the fixed pipe 3. At this time, the high-pressure liquid is located in the lower chamber of the inner cavity 6, and the pressure in the lower chamber of the inner cavity 6 increases, and drives the annular disk 7 to slide upward. The annular disk 7 drives the sealing disk 11 to slide upward through the fixing rod 10. When the high-pressure liquid in the inner cavity 6 can be sprayed out through the spray hole 5, the annular disk 7 will be stable at a The height of the range ensures the continuous output of the liquid inside the inner cavity 6 through the spray hole 5. When the liquid supply to the feed pipe 2 is stopped, the strong pressure inside the sealing groove 12 drives the sealing disk 11 to slide downward, and the sealing disk 11 drives the annular disk 7 to slide downward through the fixing rod 10. At the same time, the insert rod 9 will be slowly inserted into the spray hole 5 until the tip of the spray hole 5 extends to the bottom of the nozzle 4. When the air pressure inside the sealing groove 12 needs to be adjusted, it can be directly connected to the inflation valve 15 through an external air cylinder or a booster pump, and the pressure can be increased or decreased by observing the pressure gauge 14 and the air pressure inside the sealing groove 12.

[0039] The above description is merely a preferred embodiment of the present invention and does not constitute any other limitation to the present invention. Any person skilled in the art may utilize the above-disclosed technical content to modify or remodel the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A 2-vinylpyridine distillation device, comprising a distillation tower body (1) and a feed pipe (2) fixedly connected to the inside of the distillation tower body (1), characterized in that: The output end of the feed pipe (2) is fixedly connected to a fixed pipe (3), the output end of the fixed pipe (3) is fixedly connected to a nozzle (4), the bottom of the nozzle (4) is provided with spray holes (5) at equal intervals, the interior of the nozzle (4) is provided with an inner cavity (6), the inner cavity (6) is sealed and slidably connected to an annular disk (7), the bottom of the annular disk (7) is fixedly connected to an insert rod (9) at equal intervals, the inner wall of the annular disk (7) is fixedly connected to a silicone sealing ring (8), and the top of the annular disk (7) is fixedly connected to a A fixing rod (10) is fixedly connected to a sealing disk (11) at the top of the fixing rod (10), sealing grooves (12) are equidistantly provided at the top of the inner cavity (6), the sealing grooves (12) are connected, the sealing disk (11) is sealingly slidably connected to the inside of the sealing groove (12), the inside of the nozzle (4) is fixedly connected to a vent pipe (13) connected to the inside of the sealing groove (12), the input end of the vent pipe (13) is fixedly connected to an inflation valve (15), and a pressure gauge (14) is installed on the vent pipe (13).

2. A 2-vinylpyridine distillation device according to claim 1, characterized in that: The outer surface of the plug rod (9) passes through the spray hole (5) and extends to the bottom of the nozzle (4), and the end of the plug rod (9) is tapered.

3. A 2-vinylpyridine distillation device according to claim 1, characterized in that: A sealing ring is fixedly mounted on the outer surface of the annular disk (7), and the outer surface of the annular disk (7) is sealingly and slidingly connected to the interior of the inner cavity (6) via the sealing ring.

4. A 2-vinylpyridine distillation device according to claim 1, characterized in that: The inner wall of the silicone sealing ring (8) is sealed against the outer surface of the fixed tube (3), and the annular disk (7) is sealingly slidably connected to the outer surface of the fixed tube (3) via the silicone sealing ring (8).

5. A 2-vinylpyridine distillation device according to claim 1, characterized in that: The bottom end of the fixed tube (3) extends to the lower side of the annular disk (7).

6. A 2-vinylpyridine distillation device according to claim 1, characterized in that: The top diameter of the inner cavity (6) is larger than the bottom diameter, and the diameter of the annular disk (7) is equal to the top diameter of the inner cavity (6).

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