A pressurized separation apparatus for methanol-dimethyl carbonate azeotrope

Abstract

The utility model discloses a kind of methanol-dimethyl carbonate azeotrope pressurized separation devices in rectification separation technical field, including tower body, monitoring module for monitoring the environment in tower body, control module and be located in the packing of tower body, still include the condensing module and heating module of being located in tower body, condensing module includes several fixed cold plate and movable cold plate of intercalation distribution, heating module includes several fixed hot plate and movable hot plate of intercalation distribution, pressurized separation device further include drive module, drive module is used to drive movable cold plate and movable hot plate rotation, make the surface area size of condensing module and heating module reverse change.The utility model has realized the effect that by changing the surface area of condensing module and heating module adjusts the steam quantity in separation tower, and then adjusts the pressure condition in separation tower, improve the convenience of accurate adjustment to the pressure condition in separation tower, control difficulty is low and reaction is fast, it is favorable to maintain the stability of pressurized separation process.

Description

Technical Field

[0001] This utility model relates to the field of distillation and separation technology, specifically to a pressurized separation device for methanol-dimethyl carbonate azeotrope. Background Technology

[0002] During the reaction of ethyl methyl carbonate and ethanol, excess dimethyl carbonate feedstock will form an azeotrope with the methanol produced in the reaction and be collected from the top of the tower. Separating the methanol-dimethyl carbonate azeotrope allows for the reuse of the material.

[0003] In existing processing procedures, a separation tower is primarily used to treat the methanol-dimethyl carbonate azeotrope. The separation tower comprises a tower body, heating module, packing material, and condensation module. During separation, the tower continuously heats the injected methanol-dimethyl carbonate azeotrope, converting it into vapor. This vapor rises and, upon contact with the condensation module, transforms back into liquid, forming reflux. The generation of vapor pressurizes the tower. Under pressurized conditions, the relative volatility of methanol and dimethyl carbonate increases, making it easier for methanol to convert to a gaseous state under heating, and for dimethyl carbonate to convert from a gaseous state to a liquid state. Furthermore, the increased contact area and prolonged contact time between the descending reflux and the rising vapor as they pass through the packing material allow for further gas-liquid contact and heat exchange. Ultimately, through continuous gas-liquid contact, the proportion of methanol in the gas phase gradually increases, as does the proportion of dimethyl carbonate in the liquid phase, thus separating methanol and dimethyl carbonate.

[0004] During pressurized separation, the pressure conditions within the separation tower directly affect the relative volatility of methanol and dimethyl carbonate, thus influencing the separation efficiency. Appropriate pressure not only accelerates the separation process but also improves separation purity. Therefore, in the pressurized separation of methanol-dimethyl carbonate azeotrope, pressure regulation is necessary to maintain the pressure within the separation tower within the standard range (0.5~1.0 MPa). Existing pressure regulation methods primarily achieve this by adjusting the operating efficiency of the condensation and heating modules. However, the operating efficiency of these two modules affects not only the gas volume within the tower but also the tower temperature. The two modules must maintain a coordinated relationship to ensure the stability of the separation process. Excessive adjustment of a single module can lead to drastic fluctuations in the gas-liquid balance within the tower, especially during small-amplitude pressure adjustments, where controlling the adjustment precision of each module is more challenging. To address this, this invention proposes a pressurized separation device for methanol-dimethyl carbonate azeotrope. Utility Model Content

[0005] The purpose of this invention is to provide a pressurized separation device for methanol-dimethyl carbonate azeotrope in order to solve the above-mentioned problems.

[0006] This utility model achieves the above objectives through the following technical solutions: This utility model provides a pressurized separation device for methanol-dimethyl carbonate azeotrope, including a tower body, a monitoring module for monitoring the internal environment of the tower body, a control module, and packing material disposed in the tower body. It also includes a condensation module and a heating module disposed in the tower body, with the condensation module located at the top of the tower and the heating module located at the bottom of the tower. The condensation module includes several fixed cold plates and movable cold plates that are interspersed, and the heating module includes several fixed hot plates and movable hot plates that are interspersed. The adjacent surfaces of the fixed cold plates and movable cold plates and the fixed hot plates and movable hot plates are in contact with each other. The pressurized separation device also includes a drive module, which drives the movable cold plate and the movable hot plate to rotate, causing the surface area of ​​the condensing module and the heating module to change in opposite directions.

[0007] As a further optimization of this utility model, the condensation module also includes a water inlet pipe, a water guide pipe, and a drain pipe connected in sequence. The water guide pipe and the drain pipe both pass through the tower body. The water inlet pipe and the water guide pipe are rotatably connected. The fixed cold plate is rotatably sleeved on the water guide pipe and fixedly connected to the tower body through a bracket. The movable cold plate is fixedly sleeved on the water guide pipe. Both the fixed cold plate and the movable cold plate are connected to the water guide pipe.

[0008] As a further optimization of this utility model, the heating module also includes a rotating rod, a fixed heating plate is rotatably sleeved on the rotating rod and connected to the tower body through a bracket, and a movable heating plate is fixedly sleeved on the rotating rod.

[0009] As a further optimization of this utility model, the drive module includes an air pump, two drive discs, and a duct for connecting the air pump and the drive discs. The drive disc includes a disc, a connecting sleeve that is rotatably installed inside the disc, and a partition fan blade located outside the connecting sleeve. The connecting sleeves in the two drive discs are respectively fitted onto the drain pipe and the rotating rod.

[0010] As a further optimization of this utility model, perforations are provided on the fixed cold plate, the movable cold plate, the fixed hot plate, and the movable hot plate.

[0011] As a further optimization of this utility model, the monitoring module includes a temperature sensor and a pressure sensor, and a pressure relief valve is also provided on the tower body. The monitoring module, pressure relief valve, drive module, condensation module and heating module are all electrically connected to the control module.

[0012] The beneficial effects of this utility model are as follows: The pressurized separation device for methanol-dimethyl carbonate azeotrope provided by this utility model achieves the effect of reversely increasing or decreasing the surface area of ​​the condensing module and the heating module by simultaneously adjusting the alignment of the fixed cold plate and the movable cold plate and the alignment of the fixed hot plate and the movable hot plate. This allows the gas generation efficiency and gas liquefaction efficiency in the separation tower to change in opposite directions, thereby adjusting the amount of steam in the separation tower and thus adjusting the pressure conditions in the separation tower. This pressurized separation device establishes a direct cooperative relationship between the condensing module and the heating module, increasing the difficulty of coordinating the adjustment of the two modules and improving the convenience of precise adjustment of the pressure conditions in the separation tower. It is easy to operate and has a fast response, which is conducive to maintaining the stability of the pressurized separation process. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall appearance of the present utility model; Figure 2 This is a cross-sectional view of the internal structure of the tower. Figure 3 This is a schematic diagram showing the interaction between the condensation module, heating module, and drive module. Figure 4 This is a cross-sectional view of the internal structure of the drive disk.

[0014] In the diagram: 1. Tower body; 2. Pressure relief valve; 3. Temperature sensor; 4. Pressure sensor; 5. Packing; 6. Condensation module; 601. Water guide pipe; 602. Fixed cold plate; 603. Movable cold plate; 604. Water inlet pipe; 605. Drain pipe; 7. Heating module; 701. Rotating rod; 702. Fixed hot plate; 703. Movable hot plate; 8. Drive disc; 801. Disc; 802. Connecting sleeve; 803. Dividing fan blade; 9. Air pump; 10. Air duct; 11. Control module; 12. Support; 13. Perforation; 14. Feed pipe; 15. Angle sensor. Detailed Implementation

[0015] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0016] Example 1 like Figure 1-4 As shown, the pressurized separation device for methanol-dimethyl carbonate azeotrope in this embodiment includes a tower body 1, a monitoring module for monitoring the internal environment of the tower body 1, a control module 11, and packing 5 disposed in the tower body 1. It also includes a condensation module 6 and a heating module 7 disposed in the tower body 1, with the condensation module 6 located at the top of the tower and the heating module 7 located at the bottom of the tower. The feed pipe 14 on the tower body 1 is located above the heating module 7 and below the packing 5; The condensation module 6 includes several fixed cold plates 602 and movable cold plates 603 that are interspersed, and the heating module 7 includes several fixed hot plates 702 and movable hot plates 703 that are interspersed. The adjacent surfaces of the fixed cold plates 602 and movable cold plates 603 and the fixed hot plates 702 and movable hot plates 703 are in contact with each other. The fixed cold plate 602 and the movable cold plate 603 adopt a structure with internal condensate channels or internal condensate pipes. For details, refer to the existing refrigeration plate structure in refrigerator evaporators and dehumidifiers. The fixed heating plate 702 is heated by a built-in heating wire, and the specific structure can be referred to as that of existing ceramic heating plates or electric heaters. The pressurized separation device also includes a drive module, which is used to drive the movable cold plate 603 and the movable hot plate 703 to rotate, so that the surface area of ​​the condensing module 6 and the heating module 7 changes in opposite directions. The monitoring module includes a temperature sensor 3 and a pressure sensor 4. The tower body 1 is also equipped with a pressure relief valve 2. The monitoring module, pressure relief valve 2, drive module, condensation module 6 and heating module 7 are all electrically connected to the control module 11. The pressure relief valve 2 is used for emergency pressure relief and does not participate in pressure regulation under normal operating conditions.

[0017] When using this pressurized separation device to process methanol-dimethyl carbonate azeotrope, in the initial state, the fixed cold plate 602 and the movable cold plate 603 are aligned, the condensation module 6 is in the state with the smallest surface area, the fixed hot plate 702 and the movable hot plate 703 are perpendicular to each other, and the heating module 7 is in the state with the largest surface area. When pressure sensor 4 detects excessive pressure inside tower 1, the drive module is activated, driving the movable cold plate 603 and movable hot plate 703 to rotate synchronously. During this process, on the one hand, the contact area between the movable cold plate 603 and the fixed cold plate 602 gradually decreases, and the surface area of ​​the entire condensation module 6 gradually increases, thereby gradually increasing the gas liquefaction efficiency. On the other hand, the contact area between the movable hot plate 703 and the fixed hot plate 702 gradually increases, and the surface area of ​​the entire heating module 7 gradually decreases, thereby gradually decreasing the gas generation efficiency. Thus, the amount of gas inside tower 1 can be gradually reduced, causing the gas pressure inside tower 1 to gradually decrease until the cooperation of the condensation module 6 and the heating module 7 brings the pressure back to the standard value range, at which point the drive module can be turned off. Conversely, when the pressure inside tower 1 is too low, the drive module is activated, driving the movable cold plate 603 and movable hot plate 703 to rotate synchronously by 90 degrees. This causes the surface area of ​​the condensing module 6 to reach its maximum value, and the surface area of ​​the heating module 7 to reach its minimum value. Subsequently, the drive module continues to drive the movable cold plate 603 and movable hot plate 703 to rotate, gradually reducing the condensing efficiency of the condensing module 6 and gradually increasing the heating efficiency of the heating module 7. This combined effect gradually increases the pressure until it returns to the standard range.

[0018] Preferably, the condensation module 6 further includes an inlet pipe 604, a guide pipe 601, and a drain pipe 605 connected in sequence. The guide pipe 601 and the drain pipe 605 both penetrate the tower body 1. The inlet pipe 604 is rotatably connected to the guide pipe 601. The fixed cold plate 602 is rotatably sleeved on the guide pipe 601 and fixedly connected to the tower body 1 through the bracket 12. The movable cold plate 603 is fixedly sleeved on the guide pipe 601. Both the fixed cold plate 602 and the movable cold plate 603 are connected to the guide pipe 601. It should be emphasized that the diameter of the drain pipe 605 should be smaller than that of the inlet pipe 604 so that the condensate can fill the fixed cold plate 602 and the movable cold plate 603. The fixed cold plate 602 and the water guide pipe 601 are connected and communicated by a rotary joint or a sealed bushing with a water passage hole.

[0019] Preferably, the heating module 7 further includes a rotating rod 701, a fixed heating plate 702 is rotatably sleeved on the rotating rod 701 and connected to the tower body 1 through the bracket 12, and a movable heating plate 703 is fixedly sleeved on the rotating rod 701. An angle sensor 15 can be configured at the end of the rotating rod 701 to monitor the rotation angle of the movable cold plate 603 and the movable hot plate 703, which is beneficial for more precise control of the pressure inside the tower body 1.

[0020] Preferably, the drive module includes an air pump 9, two drive discs 8, and a duct 10 for connecting the air pump 9 and the drive discs 8. The drive disc 8 includes a disc 801, a connecting sleeve 802 that is rotatably installed inside the disc 801, and a partition fan blade 803 located outside the connecting sleeve 802. The connecting sleeves 802 inside the two drive discs 8 are respectively fitted onto the drain pipe 605 and the rotating rod 701. The air pump 9 pumps air into the disc 801 through the air duct 10, driving the rotation of the whole assembly formed by the partition fan blade 803 and the connecting sleeve 802, thereby driving the rotation of the whole assembly formed by the drain pipe 605 and the movable cold plate 603, as well as the whole assembly formed by the rotating rod 701 and the movable hot plate 703.

[0021] Preferably, the fixed cold plate 602, the movable cold plate 603, the fixed hot plate 702, and the movable hot plate 703 are all provided with through holes 13. Furthermore, when the fixed cold plate 602 and the movable cold plate 603 are aligned, the through holes 13 on the fixed cold plate 602 and the movable cold plate 603 are staggered. When the movable cold plate 603 rotates, the surface area of ​​the condensing module 6 is larger, and the adjustment effect on the condensing efficiency is more obvious. The heating module 7 also adopts the same design.

[0022] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A pressurized separation device for methanol-dimethyl carbonate azeotrope, comprising a tower body (1), a monitoring module for monitoring the internal environment of the tower body (1), a control module (11), and packing material (5) disposed within the tower body (1), characterized in that: It also includes a condensation module (6) and a heating module (7) located inside the tower body (1), with the condensation module (6) located at the top of the tower and the heating module (7) located at the bottom of the tower; The condensation module (6) includes several fixed cold plates (602) and movable cold plates (603) distributed in an interlaced manner, and the heating module (7) includes several fixed hot plates (702) and movable hot plates (703) distributed in an interlaced manner. The adjacent surfaces of the fixed cold plates (602) and movable cold plates (603) and the fixed hot plates (702) and movable hot plates (703) are in contact with each other. The pressurized separation device also includes a drive module, which is used to drive the movable cold plate (603) and the movable hot plate (703) to rotate, so that the surface area of ​​the condensing module (6) and the heating module (7) changes in opposite directions.

2. The pressurized separation device for methanol-dimethyl carbonate azeotrope according to claim 1, characterized in that: The condensation module (6) also includes a water inlet pipe (604), a water guide pipe (601), and a drain pipe (605) connected in sequence. The water guide pipe (601) and the drain pipe (605) both penetrate the tower body (1). The water inlet pipe (604) and the water guide pipe (601) are rotatably connected. The fixed cold plate (602) is rotatably sleeved on the water guide pipe (601) and fixedly connected to the tower body (1) through a bracket (12). The movable cold plate (603) is fixedly sleeved on the water guide pipe (601). The fixed cold plate (602) and the movable cold plate (603) are both connected to the water guide pipe (601).

3. The pressurized separation device for methanol-dimethyl carbonate azeotrope according to claim 2, characterized in that: The heating module (7) also includes a rotating rod (701), the fixed heating plate (702) is rotatably sleeved on the rotating rod (701) and connected to the tower body (1) through the bracket (12), and the movable heating plate (703) is fixedly sleeved on the rotating rod (701).

4. The pressurized separation device for methanol-dimethyl carbonate azeotrope according to claim 3, characterized in that: The drive module includes an air pump (9), two drive discs (8), and a duct (10) for connecting the air pump (9) and the drive discs (8). The drive disc (8) includes a disc (801), a connecting sleeve (802) that is rotatably installed inside the disc (801), and a partition fan blade (803) located outside the connecting sleeve (802). The connecting sleeves (802) inside the two drive discs (8) are respectively fitted onto the drain pipe (605) and the rotating rod (701).

5. The pressurized separation device for methanol-dimethyl carbonate azeotrope according to claim 1, characterized in that: The fixed cold plate (602), the movable cold plate (603), the fixed hot plate (702), and the movable hot plate (703) are all provided with perforations (13).

6. The pressurized separation device for methanol-dimethyl carbonate azeotrope according to claim 1, characterized in that: The monitoring module includes a temperature sensor (3) and a pressure sensor (4). The tower body (1) is also equipped with a pressure relief valve (2). The monitoring module, pressure relief valve (2), drive module, condensation module (6) and heating module (7) are all electrically connected to the control module (11).

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