A cryogenic distillation coupling device for methyl etherification waste gas

Abstract

This utility model discloses a cryogenic distillation coupling device for methyl etherification waste gas, including a distillation column and a cryogenic column. The upper end of the distillation column is connected to the bottom of the cryogenic column via a pipe. A control panel is installed on the surface of the cryogenic column. A feed inlet is located at the top of the cryogenic column, and an exhaust outlet is located at the top of the distillation column. Several sets of gas outlets are also provided on the side of the liquid collection tray near the elastic cover plate. An opening mechanism for facilitating gas discharge is provided inside the liquid collection tray. This cryogenic distillation coupling device for methyl etherification waste gas, through a drive motor in conjunction with a bevel gear assembly, a threaded rod, and a guide rod, can drive the liquid collection tray to rise and fall stably, shortening the heating time and improving the distillation efficiency. Automatic reset is achieved with a return spring, ensuring smooth gas discharge and reaction with the liquid while preventing liquid leakage, further optimizing the purification effect.

Description

Technical Field

[0001] This utility model relates to the technical field of methyl etherification waste gas treatment, specifically a cryogenic distillation coupling device for methyl etherification waste gas. Background Technology

[0002] In the methyl etherification process of chemical, petrochemical and pharmaceutical industries, the treatment and resource utilization of volatile organic compounds (VOCs) has always been a technical challenge for the industry. Methyl ether compounds (such as methyl tert-butyl ether (MTBE), dimethyl ether, etc.) are highly volatile, flammable and explosive, and some components (such as methanol) are highly toxic. If they are discharged directly without effective treatment, it will not only waste resources, but also pose a serious threat to the atmospheric environment and human health.

[0003] During carbon monoxide purification, reflux liquid needs to be injected into the distillation column for multi-stage purification. However, when the liquid refluxes onto the collecting plate, it may pass directly through the pores, preventing it from forming a sufficient volume. To address this issue, a leak-proof cryogenic distillation method for carbon monoxide purification can be found in existing technology (Chinese patent application number CN202222550385.1, filed on 2022-09-26). This device, through the arrangement of a fixed pipe, a limiting groove, a limiting block, a movable pipe, a second vent, and a top block, can effectively prevent liquid leakage. During use, the liquid flowing in from the return port is transferred to the collecting plate. While flowing and accumulating on the collecting plate, it passes through the top block. With the fit between the top block and the fixed pipe, liquid leakage can be effectively prevented. When the gas inside the distillation column rises, it impacts the movable pipe through the first vent, pushing the movable pipe upward. At the same time, the gas overflows from the second vent, making full contact with the liquid for purification.

[0004] Although the above-mentioned device can process the liquid on the collection plate, it still has some shortcomings in use. During the processing, heating is required. Since the liquid temperature is low, the heating time is relatively long, which is not conducive to subsequent processing.

[0005] Therefore, we proposed a cryogenic distillation coupling device for methyl etherification waste gas, which can effectively solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a cryogenic distillation coupling device for methyl etherification waste gas to solve the problems currently found in the market as described in the background.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a cryogenic distillation coupling device for methyl etherification waste gas, comprising a distillation column and a cryogenic column. The upper end of the distillation column is connected to the bottom of the cryogenic column via a pipe. A control panel is installed on the surface of the cryogenic column. A feed inlet is provided at the top of the cryogenic column, an exhaust port is provided at the top of the distillation column, and a liquid drain port is provided at the bottom of the distillation column. A drive motor is installed on the side wall of the distillation column, and a heating element is fixed inside the distillation column. The output end of the drive motor extends into the interior of the distillation column and is connected to the center of a liquid collection tray via a transmission component. An elastic cover is rotatably installed inside the liquid collection tray. Several sets of gas outlets are provided on the side of the liquid collection tray near the elastic cover. An opening mechanism for facilitating gas discharge is provided inside the liquid collection tray.

[0008] As a preferred technical solution of this application, the transmission component includes a bevel gear assembly fixedly connected to the output end of the drive motor, another set of gears of the bevel gear assembly is fixed at the center of the threaded rod, the bottom of the threaded rod is rotatably disposed on the inner wall of the distillation column, and a liquid collection tray is threadedly connected to the outer side of the threaded rod.

[0009] As a preferred technical solution of this application, the left and right sides of the liquid collection tray are also slidably disposed on the outside of the guide rod, and the upper and lower ends of the guide rod are fixed to the inside of the distillation column, and the outer wall of the liquid collection tray is attached to the inner wall of the distillation column.

[0010] As a preferred technical solution of this application, the distillation column is provided with several sets of liquid collection trays inside, and the number of liquid collection trays is the same as the number of heating elements.

[0011] As a preferred technical solution of this application, the opening mechanism includes a squeezing block that is slidably disposed inside the liquid collection tray. One end of the squeezing block that extends into the liquid collection tray is fixed to one side of the closing plate. The outer end of the closing plate is connected to the inner wall of the liquid collection tray by a number of sets of return springs.

[0012] As a preferred technical solution of this application, the inner side of the closed plate is provided with several sets of through holes, the inner wall of the distillation column is fixed with a bonding block, the outer side of the bonding block corresponds to one side of the extrusion block, and both the upper and lower ends of the extrusion block are inclined.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This cryogenic distillation coupling device for methyl etherification waste gas, through a drive motor in conjunction with a bevel gear assembly, a threaded rod, and a guide rod, can drive the liquid collection tray to rise and fall stably. Combined with an elastic cover plate and an opening mechanism, it can effectively prevent liquid from flowing directly through the gas hole, and specifically heat the liquid on the liquid collection tray, shortening the heating time and improving the distillation efficiency. In the opening mechanism, the contact block presses against the inclined pressing block, driving the closing plate to move. During the closing process, the descent of the liquid collection tray will cause the gas outlet to close, which will generate negative pressure, thereby accelerating the heating efficiency and facilitating subsequent heating treatment. With the help of a return spring, automatic reset is achieved, which can ensure the smooth discharge of gas and reaction with liquid, and prevent liquid leakage, further optimizing the purification effect. The specific details are as follows:

[0014] 1. By using a drive motor in conjunction with a bevel gear assembly, threaded rod, and guide rod, the liquid collection tray can be raised and lowered stably. The number of liquid collection trays is the same as that of the heating elements, which can target the liquid on the liquid collection tray for heating, effectively shortening the heating time and improving the efficiency of distillation.

[0015] 2. In the opening mechanism, the pressing block squeezes the inclined pressing block, which can drive the closing plate to move. When the liquid collection plate descends and the gas outlet closes, it generates negative pressure to accelerate heating. At the same time, the reset spring can realize automatic reset, which not only prevents liquid leakage, but also ensures that the gas and liquid fully contact and react, thus optimizing the purification effect.

[0016] 3. The device is equipped with several sets of liquid collection trays, which, combined with the lifting function, can realize multi-level distillation treatment of waste gas, meet the multi-level purification needs of methyl etherification waste gas, and improve purification accuracy and resource recovery rate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the main cross-sectional structure of the distillation column of this utility model;

[0019] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0020] Figure 4 This is a schematic diagram of the main structure of the liquid collection tray of this utility model;

[0021] Figure 5 This is a side view of the extrusion block structure of this utility model;

[0022] Figure 6 This is a schematic diagram of the main structure of the closed plate of this utility model.

[0023] In the diagram: 1. Distillation column; 2. Cryogenic column; 3. Control panel; 4. Feed inlet; 5. Exhaust port; 6. Drain port; 7. Drive motor; 8. Heating element; 9. Bevel gear assembly; 10. Threaded rod; 11. Liquid collection tray; 12. Guide rod; 13. Elastic cover plate; 14. Gas outlet; 15. Adhesive block; 16. Extrusion block; 17. Closing plate; 18. Return spring. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-6 The present invention provides the following technical solution: a cryogenic distillation coupling device for methyl etherification waste gas.

[0026] Example 1: For the distillation treatment of methyl etherification waste gas, please refer to the appendix. Figure 1 -Appendix Figure 3 The system includes a distillation column 1 and a cryogenic column 2. The upper end of the distillation column 1 is connected to the bottom of the cryogenic column 2 via a pipe. A control panel 3 is installed on the surface of the cryogenic column 2. A feed inlet 4 is located at the top of the cryogenic column 2. An exhaust port 5 is located at the top of the distillation column 1. A drain port 6 is located at the bottom of the distillation column 1. The transmission components include a bevel gear assembly 9 fixedly connected to the output end of a drive motor 7. Another set of gears of the bevel gear assembly 9 is fixed at the center of a threaded rod 10. The bottom of the threaded rod 10 is rotatably mounted on the inner wall of the distillation column 1. A liquid collecting tray 11 is threadedly connected to the outer side of the threaded rod 10. The left and right sides of the liquid collecting tray 11 are also slidably mounted on the outer side of a guide rod 12. The upper and lower ends of the guide rod 12 are fixed to the inner side of the distillation column 1. The outer wall of the liquid collecting tray 11 is attached to the inner wall of the distillation column 1. Several sets of liquid collecting trays 11 are provided inside the distillation column 1. The number of liquid collecting trays 11 is the same as the number of heating elements 8.

[0027] The methyl etherification waste gas first enters the cryogenic tower 2 through the feed inlet 4 at the top of the cryogenic tower 2 for preliminary treatment. The treated waste gas then enters the distillation tower 1 through the connecting pipe between the bottom of the cryogenic tower 2 and the top of the distillation tower 1 for further distillation and purification. During the operation of the distillation tower 1, the drive motor 7 can be started via the control panel 3 on the surface of the cryogenic tower 2. The output end of the drive motor 7 drives the bevel gear assembly 9 to rotate. Since another set of gears in the bevel gear assembly 9 is fixed at the center of the threaded rod 10, it will synchronously drive the threaded rod 10 to rotate on the inner wall of the distillation tower 1. Because the liquid collection tray 11 is threadedly connected to the outside of the threaded rod 10, and its left and right sides are... Sliding sleeve on guide rod 12, when threaded rod 10 rotates, liquid collecting plate 11 will stably rise and fall in the vertical direction under the limiting and guiding action of guide rod 12. At the same time, the outer wall of liquid collecting plate 11 is in contact with the inner wall of distillation column 1, which can prevent liquid or gas from leaking from the gap. Since there are several sets of liquid collecting plates 11 inside distillation column 1, and the number of liquid collecting plates 11 is the same as that of heating element 8, when liquid collecting plate 11 rises and falls to the position matching the corresponding heating element 8, heating element 8 can specifically heat the liquid on liquid collecting plate 11 to promote gas-liquid separation and distillation reaction. Finally, the purified gas is discharged from exhaust port 5 at the top of distillation column 1, and waste liquid is discharged from drain port 6 at the bottom.

[0028] Example 2: This example differs from Example 1 in that it involves more efficient heating of the liquid material. Please refer to the appendix for details. Figure 2 and attached Figure 4 -Appendix Figure 6 The liquid collection tray 11 is provided with several sets of air outlets 14 on the side near the elastic cover plate 13. The liquid collection tray 11 is provided with an opening mechanism to facilitate gas discharge. The opening mechanism includes a squeezing block 16 that is slidably disposed inside the liquid collection tray 11. One end of the squeezing block 16 that extends into the liquid collection tray 11 is fixed to one side of the closing plate 17. The outer end of the closing plate 17 is connected to the inner wall of the liquid collection tray 11 by several sets of return springs 18. Several sets of through holes are opened on the inner side of the closing plate 17. The inner wall of the distillation column 1 is fixed with a bonding block 15. The outer side of the bonding block 15 corresponds to one side of the squeezing block 16. The upper and lower ends of the squeezing block 16 are inclined.

[0029] During the lifting and lowering of the liquid collection tray 11 with the drive structure, when the liquid collection tray 11 moves to a specific position, the bonding block 15 fixed to the inner wall of the distillation column 1 will contact the squeezing block 16 on the liquid collection tray 11. Since the upper and lower ends of the squeezing block 16 are inclined, the bonding block 15 will generate a lateral thrust on the squeezing block 16, forcing the squeezing block 16 to slide into the liquid collection tray 11, thereby driving the closing plate 17 fixedly connected to it to move synchronously and compress the return spring 18. At this time, the through hole on the inner side of the closing plate 17 is misaligned with the gas outlet 14 on the liquid collection tray 11, and the gas outlet 14 is blocked by the closing plate 17. In this state, when the liquid material in the liquid collection tray 11 is heated under the action of the corresponding heating element 8, due to... When the vent 14 is closed, a relatively enclosed space is formed inside the liquid collection tray 11, which generates a certain negative pressure, accelerating the transfer and exchange of heat in the liquid material, greatly improving heating efficiency, and achieving efficient heating treatment of the liquid material. When the liquid collection tray 11 continues to rise and fall, after the extrusion block 16 separates from the bonding block 15, the elastic force of the return spring 18 will push the closing plate 17 and the extrusion block 16 to return to their original positions. At this time, the through hole on the inner side of the closing plate 17 is realigned with the vent 14, and the vent 14 is opened, which facilitates the gas to be discharged through the vent 14 and fully contact the liquid in the upper and lower layers for distillation reaction. At the same time, the elastic cover plate 13 can prevent the liquid from flowing directly through the vent 14, ensuring the stability of the gas-liquid reaction.

[0030] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cryogenic distillation coupling device for methyl etherification waste gas, comprising a distillation column (1) and a cryogenic column (2), wherein the upper end of the distillation column (1) is connected to the bottom of the cryogenic column (2) via a pipe, a control panel (3) is installed on the surface of the cryogenic column (2), a feed inlet (4) is provided at the top of the cryogenic column (2), an exhaust port (5) is provided at the top of the distillation column (1), and a liquid drain port (6) is provided at the bottom of the distillation column (1); characterized in that A drive motor (7) is installed on the side wall of the distillation column (1). A heating element (8) is also fixed inside the distillation column (1). The output end of the drive motor (7) extends into the interior of the distillation column (1) and is connected to the center of the collection tray (11) through a transmission component. An elastic cover plate (13) is rotatably installed inside the collection tray (11). Several sets of gas outlets (14) are also provided on the side of the collection tray (11) near the elastic cover plate (13). An opening mechanism for facilitating gas discharge is provided inside the collection tray (11).

2. A methyl etherification off-gas cryogenic rectification coupling device according to claim 1, characterized in that: The transmission component includes a bevel gear assembly (9) fixedly connected to the output end of the drive motor (7). Another set of gears of the bevel gear assembly (9) is fixed at the center of the threaded rod (10). The bottom of the threaded rod (10) is rotatably disposed on the inner wall of the distillation column (1). The outer side of the threaded rod (10) is threadedly connected to a liquid collection tray (11).

3. The cryogenic distillation coupling device for methyl etherification waste gas according to claim 2, characterized in that: The liquid collection tray (11) is also slidably disposed on the outside of the guide rod (12) on the left and right sides. The upper and lower ends of the guide rod (12) are fixed on the inside of the distillation column (1). The outer wall of the liquid collection tray (11) is attached to the inner wall of the distillation column (1).

4. The apparatus for deep cooling rectification of waste methyl ether coupled with exhaust according to claim 2, characterized in that: The distillation column (1) is equipped with several sets of liquid collection trays (11), and the number of liquid collection trays (11) is the same as the number of heating elements (8).

5. The apparatus of claim 1, wherein the apparatus is characterized by: The opening mechanism includes a squeezing block (16) that is slidably disposed inside the liquid collection tray (11). One end of the squeezing block (16) that extends into the liquid collection tray (11) is fixed to one side of the closing plate (17). The outer end of the closing plate (17) is connected to the inner wall of the liquid collection tray (11) by several sets of return springs (18).

6. A methyl etherification off-gas cryogenic rectification coupling device according to claim 5, characterized in that: The inner side of the closed plate (17) is provided with several sets of through holes. The inner wall of the distillation column (1) is fixed with a bonding block (15). The outer side of the bonding block (15) corresponds to one side of the extrusion block (16). The upper and lower ends of the extrusion block (16) are inclined.

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