Purifying device for dimethyl carbonate

Abstract

The utility model discloses a dimethyl carbonate purification device, which relates to the technical field of rectifying towers, and comprises a tower body, the tower body is cylindrical, the axis of the tower body is vertically arranged, a first tower plate and a second tower plate which are staggered up and down are fixedly arranged in the tower body, overflow weirs are fixedly arranged on the first tower plate and the second tower plate, and mounting holes are arranged on the first tower plate and the second tower plate. And an exhaust adjusting unit is mounted in the mounting hole. The device has the beneficial effects that a gas guide pipe can rotate during lifting through a threaded sliding groove, a fixing plate and a second ball, a material stirring mechanism is driven to disturb instant gas flow sprayed out of a gas hole, the liquid flooding phenomenon is avoided, the gas-liquid contact area is increased, the gas-liquid contact time is prolonged, the gas-liquid mass transfer efficiency is improved, the purification purity of dimethyl carbonate is improved, energy consumption is reduced, and the device is suitable for popularization and application. And the size of the air hole can be automatically adjusted, so that air flow is controlled, liquid leakage is reduced, stable air-liquid flow in the tower body is maintained, and the problem of unsmooth air outlet or overlarge pressure drop caused by pressure fluctuation is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of distillation column technology, and in particular to a purification device for dimethyl carbonate. Background Technology

[0002] In the production of dimethyl carbonate, purification equipment is usually required, with distillation columns being the most commonly used. Distillation columns are divided into packed and tray types. A tray distillation column typically consists of a cylindrical shell with several trays arranged horizontally at certain intervals. During distillation in a tray column, three common problems arise: entrainment, leakage, and flooding. Entrainment refers to the mixing of gas and liquid, with a large amount of liquid being carried between the trays. Leakage occurs when insufficient gas flow causes liquid to leak from the sieves on the trays. Flooding occurs when excessive gas flow carries liquid from the lower tray to the upper tray.

[0003] A search revealed that Chinese patent application CN119565199A discloses a distillation column with an anti-clogging structure, which mainly reduces pedal blockage through floats and elastic arc plates.

[0004] Compared with existing technologies in related fields, it can be seen that traditional purification devices are difficult to effectively cope with pressure fluctuations inside the tower. When the pressure of the steam material changes, the instantaneous increase in airflow will cause the liquid material to move, resulting in flooding. The contact time between the steam material and the liquid material is limited, the mass transfer efficiency is low, and the purification quality is affected. Utility Model Content

[0005] The purpose of this invention is to provide a dimethyl carbonate purification device to solve the above-mentioned problems.

[0006] This utility model achieves the above objectives through the following technical solutions:

[0007] A dimethyl carbonate purification device includes a tower body, which is a cylindrical shape with a vertical axis. A feed inlet is fixedly installed on the middle and upper sides of the tower body. A gas outlet and a condensate reflux outlet are fixedly installed at the upper end of the tower body. A liquid outlet and a steam inlet are fixedly installed at the lower end of the tower body. Inside the tower body, a first and a second tower plate are arranged in an alternating vertical arrangement. A second downcomer is fixedly installed on the lower surface of the first tower plate, and a first downcomer is fixedly installed on the lower surface of the second tower plate. Overflow weirs and mounting holes are fixedly installed on both the first and second tower plates, and exhaust regulating units are installed within the mounting holes.

[0008] The exhaust regulating unit includes an air guide pipe, which is slidably installed in a mounting hole. A reset component is installed at the lower end of the air guide pipe, and a guide component is fixedly installed in the middle of the air guide pipe. A top cover and a series of air holes are fixedly installed at the upper end of the air guide pipe. A mounting cavity is arranged on the lower surface of the top cover, and a feeding mechanism is installed in the mounting cavity. A threaded groove is provided in the mounting hole, and the threaded groove is slidably connected to the air guide pipe through the guide component.

[0009] Furthermore, the guiding assembly includes a fixing plate arranged on the air guide tube, and a second ball bearing is rotatably mounted on the fixing plate. The fixing plate and the second ball bearing are slidably connected in a threaded groove.

[0010] Furthermore, the tilt angle of the fixed plate arrangement is the same as the helical angle of the threaded groove.

[0011] Furthermore, the reset assembly includes a spring that is sleeved on the gas guide tube. The spring is located below the first and second tower plates respectively. A sliding base is fixedly installed at the lower end of the spring, and the sliding base is rotatably connected to the lower end of the gas guide tube.

[0012] Furthermore, the feeding mechanism is a telescopic rod, and a first ball bearing is rotatably installed on the telescopic end of the feeding mechanism.

[0013] Furthermore, the first downcomer is located at the middle of the lower surface of the second tray, and the second downcomer is located at both ends of the lower surface of the first tray.

[0014] Furthermore, level sensors are fixedly installed on the upper surfaces of both the first and second trays, and pressure sensors are fixedly installed on the sides of the first and second downcomers.

[0015] The advantages compared to existing technologies are as follows:

[0016] The threaded groove, fixed plate, and second ball bearing cause the gas guide pipe to rotate during its raising and lowering, which in turn drives the material feeding mechanism to disrupt the instantaneous airflow ejected from the gas holes, preventing flooding, increasing the gas-liquid contact area and time, improving gas-liquid mass transfer efficiency, helping to improve the purification purity of dimethyl carbonate, and reducing energy consumption. Furthermore, through the raising and lowering movement of the gas guide pipe, the size of the gas holes can be automatically adjusted according to the pressure of the steam material during the purification process, thereby controlling the airflow, reducing leakage, maintaining stable gas-liquid flow in the tower, and effectively avoiding problems such as poor gas output or excessive pressure drop on the tower plates caused by pressure fluctuations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a partial cross-sectional structural diagram of the tower body of the dimethyl carbonate purification device described in this utility model;

[0019] Figure 2 This is a schematic diagram of the tower structure of the dimethyl carbonate purification device described in this utility model;

[0020] Figure 3 This is a partial cross-sectional view of the first tray of the dimethyl carbonate purification device described in this utility model.

[0021] Figure 4 This invention relates to a dimethyl carbonate purification apparatus. Figure 3 Enlarged structural diagram at point A in the middle;

[0022] Figure 5 This invention relates to a dimethyl carbonate purification apparatus. Figure 3 Enlarged structural diagram at point B;

[0023] Figure 6 This is a schematic diagram of the connection structure of the gas guide tube, spring, and top cover of the dimethyl carbonate purification device described in this utility model;

[0024] Figure 7 This invention relates to a dimethyl carbonate purification apparatus. Figure 6 Enlarged structural diagram at point C;

[0025] Figure 8 This is a schematic diagram of the connection structure between the first and second trays of the dimethyl carbonate purification device described in this utility model.

[0026] Figure 9 This invention relates to a dimethyl carbonate purification apparatus. Figure 8 Enlarged structural diagram at point D.

[0027] The annotations in the attached figures are explained as follows:

[0028] 1. Tower body; 2. First tower plate; 301. Gas guide pipe; 302. Top cover; 303. Gas hole; 304. Mounting cavity; 305. Material feeding mechanism; 306. First ball bearing; 307. Fixing plate; 308. Second ball bearing; 309. Threaded groove; 310. Spring; 311. Sliding base; 4. Second tower plate; 5. Liquid level sensor; 6. Pressure sensor; 7. Mounting hole; 8. First downcomer; 9. Second downcomer. Detailed Implementation

[0029] like Figures 1-9 As shown, a dimethyl carbonate purification device includes a tower body 1, which is a cylindrical shape with a vertically aligned axis. A feed inlet is fixedly installed on the middle and upper sides of the tower body 1. A gas outlet and a condensate reflux outlet are fixedly installed at the upper end of the tower body 1, and a liquid outlet and a steam inlet are fixedly installed at the lower end of the tower body 1. Inside the tower body 1, first and second trays 2 and 4 are arranged in an alternating vertical arrangement. A second downcomer 9 is fixedly installed on the lower surface of the first tray 2, and a first downcomer 8 is fixedly installed on the lower surface of the second tray 4. Overflow weirs and mounting holes 7 are fixedly installed on both the first and second trays 2 and 4. An exhaust regulating unit is installed within the mounting holes 7. The raw material liquid enters the tower body 1 through the feed inlet, flows on the first tray 2, and is distributed on the first tray 2. It then flows through the second downcomers 9 at both ends to the lower second tray 4. The material on the second tray 4 flows through the first downcomers 8 to the next tray. On the first tray 2 below, the liquid material flows in an S-shape within the tower body 1. The liquid material flows out through the liquid outlet, with some entering the next process and some entering the reboiler. The overflow weir blocks the liquid material, ensuring that a certain liquid level is formed on both the first tray 2 and the second tray 4. The reboiler delivers the boiled steam into the tower body 1 through the steam inlet. After the steam material enters the tower body 1, the pressure inside the tower body 1 increases, and the steam material pushes the exhaust regulating unit. The steam material enters the liquid material on the first tray 2 and the second tray 4 through the exhaust regulating unit and the mounting hole 7 for heat and mass transfer. After heat and mass transfer, the steam material rises to the upper end of the tower body 1 and is discharged into the condenser through the gas outlet. The condenser condenses the liquid material, with some entering the next process and some flowing back into the tower body 1 through the condenser reflux port to participate in purification again.

[0030] like Figure 1 , Figures 3-9As shown, the exhaust regulating unit includes an exhaust pipe 301, which is slidably installed in the mounting hole 7. A reset assembly is installed at the lower end of the exhaust pipe 301, and a guide assembly is fixedly installed at the middle position of the exhaust pipe 301. A top cover 302 and arranged air holes 303 are fixedly installed at the upper end of the exhaust pipe 301. An installation cavity 304 is arranged on the lower surface of the top cover 302. A material feeding mechanism 305 is installed in the installation cavity 304. A threaded groove 309 is provided in the mounting hole 7. The threaded groove 309 is slidably connected to the exhaust pipe 301 through the guide assembly. Steam material enters the gas guide pipe 301, and is supported and pushed by the top cover 302. The top cover 302 drives the gas guide pipe 301 to move up and down within the mounting hole 7, adjusting the height of the top cover 302 and the vent 303 above the first tray 2 and the second tray 4. The steam material in the gas guide pipe 301 is dispersed into the liquid material on the first tray 2 and the second tray 4 through the vent 303 for heat and mass transfer. The steam material ejected from the vent 303 collides with the feeding mechanism 305, causing the steam material to disperse into the liquid material. When the pressure of the steam material in the tower body 1 changes... The steam exerts a large force on the top cover 302, causing the top cover 302 to move the gas guide pipe 301 a greater distance. This results in a wider opening of the vent 303, facilitating better entry of the steam into the liquid material. When the pressure decreases, the reset component resets the gas guide pipe 301, reducing the opening of the vent 303 and minimizing leakage. This effectively prevents problems such as poor gas flow or excessive pressure drop on the first and second trays 4 due to pressure fluctuations, maintaining the stability of the gas-liquid flow within the tower body 1 for better purification. During the raising and lowering of the gas guide pipe 301... 1. The guide component is moved by the threaded groove 309, which limits and guides the guide component, allowing it to move along the threaded groove 309. The threaded groove 309 and the air guide pipe 301 rotate during the lifting process. When the air guide pipe 301 rotates, it drives the feeding mechanism 305 through the top cover 302 to disturb the instantaneous airflow ejected from the air hole 303, avoiding the liquid overflow phenomenon caused by excessive instantaneous airflow, increasing the gas-liquid contact area and time, improving the gas-liquid mass transfer efficiency, helping to improve the purification purity of dimethyl carbonate and reduce energy consumption.

[0031] like Figure 5 , Figure 7 , Figure 9As shown, the guiding assembly includes a fixed plate 307, which is arranged on the air guide pipe 301. A second ball bearing 308 is rotatably mounted on the fixed plate 307. The fixed plate 307 and the second ball bearing 308 are slidably connected in a threaded groove 309. When the air guide pipe 301 is raised and lowered by the force of the steam material, the air guide pipe 301 drives the fixed plate 307 and the second ball bearing 308 to move up and down. The threaded groove 309 guides the fixed plate 307 and the second ball bearing 308. The fixed plate 307 and the second ball bearing 308 move along the threaded groove 309. The threaded groove 309, the fixed plate 307 and the second ball bearing 308 make the air guide pipe 301 rotate while it is raised and lowered.

[0032] like Figure 5 , Figure 7 , Figure 9 As shown, the tilt angle of the fixed plate 307 is the same as the helical angle of the threaded groove 309, so that the fixed plate 307 can be better limited and guided by the threaded groove 309, thereby improving the stability of the air pipe 301 when rotating and lifting.

[0033] like Figure 3 , Figure 6 As shown, the reset assembly includes a spring 310, which is sleeved on the air guide tube 301. The spring 310 is located below the first tower plate 2 and the second tower plate 4. A sliding base 311 is fixedly installed at the lower end of the spring 310. The sliding base 311 is rotatably connected to the lower end of the air guide tube 301. During the rotation and lifting movement of the air guide tube 301, since the sliding base 311 is rotatably connected to the air guide tube 301, the spring 310 and the sliding base 311 will not obstruct the rotation of the air guide tube 301. When the steam material inside the tower body 1 increases during the pure process, causing the pressure to increase, the steam material will drive the gas guide pipe 301 to move upward. The gas guide pipe 301 compresses the spring 310 through the sliding base 311. When the pressure inside the tower body 1 decreases, under the elastic force of the spring 310, the spring 310 drives the gas guide pipe 301 to move downward through the sliding base 311, adjusting the distance between the top cover 302 and the upper surface of the first tower plate 2 or the second tower plate 4, thereby adjusting and controlling the size of the gas outlet 303.

[0034] like Figure 4 As shown, the feeding mechanism 305 is a telescopic rod. A first ball bearing 306 is rotatably mounted on the telescopic end of the feeding mechanism 305. The first ball bearing 306 enables the telescopic end of the feeding mechanism 305 to move better along the surface of the first tray 2 and the second tray 4. Since the feeding mechanism 305 is a telescopic rod, it can extend along with the movement of the top cover 302, so that the feeding mechanism 305 can turbulent the airflow ejected from the air hole 303 and avoid affecting the movement of the top cover 302.

[0035] like Figure 1 , Figure 3 , Figure 8 As shown, the first downcomer 8 is located in the middle of the lower surface of the second tray 4, and the second downcomer 9 is located at both ends of the lower surface of the first tray 2. The liquid material on the first tray 2 flows quickly to the second tray 4 through the second downcomer 9 at both ends. The second tray 4 guides the liquid material from the middle position to the first tray 2 through the first downcomer 8. The corresponding positions of the first downcomer 8 and the second downcomer 9 enable the liquid material to flow better on the first tray 2 and the second tray 4, allowing the liquid material to flow in an S-shape from top to bottom in the tower body 1, ensuring the uniformity of the liquid material distribution on the first tray 2 and the second tray 4, and ensuring sufficient contact and exchange between the liquid material and the vapor material.

[0036] like Figure 1 , Figure 3 , Figure 8 , Figure 9 As shown, a liquid level sensor 5 is fixedly installed on the upper surface of the first tray 2 and the second tray 4, and a pressure sensor 6 is fixedly installed on the side of the first downcomer 8 and the second downcomer 9. The liquid level sensor 5 detects the liquid level of the first tray 2 and the second tray 4 to prevent low liquid levels from affecting the contact between the liquid and vapor materials. The pressure sensor 6 detects the pressure of the vapor material between the first tray 2 and the second tray 4, which makes it easier for the staff to grasp the gas pressure inside the tower body 1 and improves safety.

[0037] Working principle: such as Figures 1-3 , Figures 6-9 As shown, during the purification and separation of dimethyl carbonate, the raw material liquid enters the tower body 1 through the feed inlet. The raw material liquid flows on the first tray 2 and is distributed on the first tray 2. Then, it flows through the second downcomers 9 at both ends to the lower second tray 4. The material on the second tray 4 flows through the first downcomer 8 to the lower first tray 2, so that the liquid material flows in an S-shape in the tower body 1. The liquid phase material flows out through the liquid phase outlet. Part of the liquid material enters the next process, and part of the liquid material enters the reboiler. The reboiler delivers the boiled steam to the tower body 1 through the steam inlet.

[0038] like Figures 1-3 , Figures 6-9As shown, the steam material in the tower body 1 enters the gas guide pipe 301 and pushes the top cover 302. The gas guide pipe 301 moves in the mounting hole 7. The steam material is dispersed into the liquid material on the first tower plate 2 and the second tower plate 4 through the gas hole 303 for heat and mass transfer. After heat and mass transfer, the steam material rises to the upper end of the tower body 1 and is discharged into the condenser through the gas phase outlet. It is condensed into liquid by the condenser. Part of the condensed liquid enters the next process, and part of it flows back into the tower body 1 through the condenser reflux port to participate in purification again.

[0039] like Figure 5 , Figure 7 , Figure 9 As shown, when the increase of steam material leads to an increase in pressure in tower body 1, the gas guide pipe 301 moves under the force of the steam material. The gas guide pipe 301 drives the fixed plate 307 and the second ball bearing 308 to move. The fixed plate 307 and the second ball bearing 308 are guided by the threaded groove 309. The threaded groove 309, the fixed plate 307 and the second ball bearing 308 make the gas guide pipe 301 rotate while it is rising and falling.

[0040] like Figure 4 , Figure 6 As shown, when the air guide pipe 301 rotates, the air guide pipe 301 drives the material feeding mechanism 305 through the top cover 302 to disturb the instantaneous airflow ejected from the air hole 303, so that the steam material disperses into the liquid material for heat and mass transfer.

[0041] like Figure 3 , Figure 6 As shown, when the gas guide pipe 301 moves upward, the gas guide pipe 301 compresses the spring 310 through the sliding base 311. When the pressure inside the tower body 1 decreases, under the elastic force of the spring 310, the spring 310 drives the gas guide pipe 301 to move downward through the sliding base 311, adjusting the distance between the top cover 302 and the upper surface of the first tower plate 2 or the second tower plate 4, thereby adjusting and controlling the size of the gas outlet 303 to avoid leakage.

[0042] like Figure 1 , Figure 3 , Figure 8 , Figure 9 As shown, during the purification process, the liquid level of the liquid material on the first tray 2 and the second tray 4 is detected by the liquid level sensor 5, and the pressure of the vapor material between the first tray 2 and the second tray 4 is detected by the pressure sensor 6, so as to ensure the stable operation of the purification process.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A purification apparatus for dimethyl carbonate, characterized in that, The tower body (1) is a cylindrical shape with a vertical axis. The middle and upper sides of the tower body (1) are fixedly provided with a feed inlet. The upper end of the tower body (1) is fixedly provided with a gas phase outlet and a condensate reflux outlet. The lower end of the tower body (1) is fixedly provided with a liquid phase outlet and a steam inlet. The interior of the tower body (1) is fixedly arranged with a first tower plate (2) and a second tower plate (4) arranged vertically. The lower surface of the first tower plate (2) is fixedly installed with a second downcomer (9). The lower surface of the second tower plate (4) is fixedly installed with a first downcomer (8). Both the first tower plate (2) and the second tower plate (4) are fixedly provided with an overflow weir and an installation hole (7) arranged in a row. An exhaust regulating unit is installed in the installation hole (7). The exhaust regulating unit includes an air guide pipe (301), which is slidably installed in the mounting hole (7). A reset component is installed at the lower end of the air guide pipe (301), and a guide component is fixedly installed at the middle position of the air guide pipe (301). A top cover (302) and an array of air holes (303) are fixedly installed at the upper end of the air guide pipe (301). An installation cavity (304) is arranged on the lower surface of the top cover (302). A feeding mechanism (305) is installed in the installation cavity (304). A threaded groove (309) is provided in the mounting hole (7). The threaded groove (309) is slidably connected to the air guide pipe (301) through the guide component.

2. The apparatus for purifying dimethyl carbonate according to claim 1, characterized in that: The guiding assembly includes a fixing plate (307), which is arranged on the air guide pipe (301). A second ball bearing (308) is rotatably mounted on the fixing plate (307), and the fixing plate (307) and the second ball bearing (308) are slidably connected in the threaded groove (309).

3. The dimethyl carbonate purification apparatus according to claim 2, characterized in that: The tilt angle of the fixed plates (307) is the same as the helical angle of the threaded grooves (309).

4. The apparatus for purifying dimethyl carbonate according to claim 1, characterized in that: The reset assembly includes a spring (310) sleeved on the gas guide pipe (301). The spring (310) is located below the first tower plate (2) and the second tower plate (4) respectively. A sliding base (311) is fixedly installed at the lower end of the spring (310), and the sliding base (311) is rotatably connected to the lower end of the gas guide pipe (301).

5. The apparatus for purifying dimethyl carbonate according to claim 4, characterized in that: The feeding mechanism (305) is a telescopic rod, and a first ball bearing (306) is rotatably mounted on the telescopic end of the feeding mechanism (305).

6. The apparatus for purifying dimethyl carbonate according to claim 1, characterized in that: The first downcomer (8) is located in the middle of the lower surface of the second tray (4), and the second downcomer (9) is located at both ends of the lower surface of the first tray (2).

7. The apparatus for purifying dimethyl carbonate according to claim 1, characterized in that: A liquid level sensor (5) is fixedly installed on the upper surface of the first tray (2) and the second tray (4), and a pressure sensor (6) is fixedly installed on the side of the first downcomer (8) and the second downcomer (9).

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