Reaction rectifying tower for preparing ethylene glycol

Abstract

The invention relates to the field of rectifying towers, and discloses a reaction rectifying tower for ethylene glycol preparation, which comprises a rectifying tower body, a wave tower plate, a discharge shell, a turnover piece, a scraping mechanism, a rolling suction mechanism, an ejection mechanism, a guide return piece, a draw-off pump and a communication shell, the wave tower plate is mounted in the rectifying tower body, the middle part of the wave tower plate is divided into two sub-wave tower plates by the discharging shell, and the two sub-wave tower plates are connected through the communicating shell so as to guide an ethylene glycol solution; the overturning piece is arranged on the discharging shell, and the guiding return piece is connected with the scraping mechanism. The scraping mechanism is connected with the driving part, and when the driving part drives the scraping mechanism to scrape the wave tower plate, steam extraction and drainage are synchronously carried out. The driving piece and the scraping mechanism work cooperatively, non-stop cleaning is achieved, the sleeve plate one-way air inlet valve is matched with the scraping plate exhaust hole to purge impurities and strengthen mass transfer, the magnetic block rotates to attract the ejection mechanism to eject the pipe to clear blockage, and it is guaranteed that steam passes through.

Description

Technical Field

[0001] The present invention relates to the technical field of distillation columns, and more specifically, it relates to a reactive distillation column for ethylene glycol preparation. Background Art

[0002] Ethylene glycol, as a key chemical raw material and strategic material, plays an important role in multiple industrial fields. For example, it is used in the production of polyester terylene and polyester resin, and can also be used as a hygroscopic agent, plasticizer, surfactant, synthetic fiber, and solvent. Currently, the main production process of ethylene glycol is the hydration of ethylene oxide. This process uses ethylene obtained from petroleum cracking as the starting material. First, ethylene is converted into ethylene oxide through an oxidation reaction, and then ethylene oxide undergoes a hydration reaction to produce ethylene glycol. In the production process of ethylene glycol, the distillation column plays a crucial role. It mainly separates and purifies ethylene glycol from complex reaction products through separation and purification operations, significantly improving its purity, and ultimately realizing the preparation of high-purity ethylene glycol.

[0003] In the preparation of ethylene glycol, due to the polymerization reaction of the ethylene glycol system under certain conditions, the generated substances will adhere to the surface of the tray, hindering the gas-liquid flow, resulting in the blockage of the distillation column tray due to the deposition of impurities or polymers, preventing the steam (gas phase) from passing through, and reducing the mass transfer efficiency and production capacity. Summary of the Invention

[0004] The present invention provides a reactive distillation column for ethylene glycol preparation, which solves the technical problems in the related art that the distillation column tray is blocked due to the deposition of impurities or polymers, preventing the steam from passing through, and reducing the mass transfer efficiency and production capacity.

[0005] The present invention provides a reactive distillation column for ethylene glycol preparation, including a distillation column body, a corrugated tray, a discharge shell, a flipping member, a scraping mechanism, a rolling suction mechanism, an ejecting mechanism, a guiding and restoring member, an extraction pump, and a connecting shell; The corrugated tray is installed in the distillation column body. The middle part of the corrugated tray is separated into two sub-corrugated trays by the discharge shell, and the two sub-corrugated trays are connected by a connecting shell to guide the ethylene glycol solution; The flipping member is arranged on the discharge shell, and the guiding and restoring member is connected to the scraping mechanism; The scraping mechanism is connected to a driving member. When the driving member drives the scraping mechanism to scrape the corrugated tray, steam is simultaneously pumped out to scrape the impurities to the flipping member and enter the discharge shell. At the same time, the rolling suction mechanism of the corrugated tray intermittently attracts and triggers the ejecting mechanism to act on the air holes of the corrugated tray; The extraction pump connects the discharge shell and the distillation column body to discharge the steam in the discharge shell back to the distillation column body.

[0006] As a further optimization scheme of the present invention, the flipping member includes a flipping plate and a push rod. A discharge opening is formed on the discharge housing. The flipping plate is hinged at the discharge opening and is connected to the push rod.

[0007] As a further optimization scheme of the present invention, the scraping mechanism includes a sleeve plate, a scraping plate, a return spring and a one-way air inlet valve. The sleeve plate is connected to the guiding and returning member. The scraping plate slides into the interior of the sleeve plate and is connected to the inner top wall of the sleeve plate through the return spring. A cavity communicating with each other is formed in both the scraping plate and the sleeve plate. An exhaust hole inclined upward and communicating with the cavity is formed at the scraping portion of the scraping plate. The one-way air inlet valve is arranged on the sleeve plate to supply air to the cavity unidirectionally.

[0008] As a further optimization scheme of the present invention, a rolling disc is rotatably connected to the scraping plate through a rotating shaft, and the rolling disc is in rolling connection with the corrugated tower plate.

[0009] As a further optimization scheme of the present invention, the rolling attraction mechanism includes a mounting block, a rotating rod, a rotating column and a magnetic block. The mounting block is mounted on the sleeve plate. The rotating column is rotatably connected to the mounting block through the rotating rod. The magnetic block is embedded on the rotating column. The number of the magnetic blocks is multiple and they are distributed at intervals. A transmission rod drivingly connected to the rotating rod is mounted on the inner wall of the rectifying tower body.

[0010] As a further optimization scheme of the present invention, the ejecting mechanism includes a telescopic tube, a ejecting tube and a corrugated screen. The telescopic tube is mounted on the discharge housing, and its moving end is connected to the corrugated screen. The number of the ejecting tubes is multiple. The multiple ejecting tubes are mounted on the corrugated screen and are arranged corresponding to the air holes on the tower plate.

[0011] As a further optimization scheme of the present invention, a magnetic member is embedded on the corrugated screen to adsorb with the magnetic block.

[0012] As a further optimization scheme of the present invention, the guiding and returning member includes an inclined pulling spring, a connecting block and a guide rod. The connecting block is mounted on the sleeve plate. One end of the inclined pulling spring is hinged to the rectifying tower body, and the other end is hinged to the connecting block. The guide rod is mounted on the discharge housing, and one end of the guide rod slidably passes through the connecting block.

[0013] As a further optimization scheme of the present invention, the driving member includes a driving motor, a winding rod and a pulling rope. The winding rod is rotatably arranged in the middle of the rectifying tower body and is driven by the driving motor. One end of the pulling rope is fixedly connected to the winding rod, and the other end is fixedly connected to the connecting block.

[0014] As a further optimized solution of the present invention, multiple layers of the wavy trays are arranged from top to bottom in the rectification tower body, and a notch is formed between each layer of the wavy tray and the inner wall of the rectification tower body, and multiple notches are distributed in a staggered manner, so that the multiple layers of wavy trays form an S-shaped flow path for the liquid. A diversion shell is installed at the notch, a flow channel communicating with the diversion shell is opened in the wall of the rectification tower body, and the drain outlet of the flow channel is located at the next layer of the wavy tray.

[0015] The beneficial effects of the present invention are as follows: 1. For the reactive distillation column for ethylene glycol preparation of the present invention, through the cooperative operation mechanism of the driving member and the scraping mechanism, the driving member provides power for the scraping mechanism, enabling it to perform scraping operations on the wavy trays, and conveying the scraped materials to the discharge shell for centralized collection. It can achieve cleaning operations without shutting down the machine, effectively reduce the occurrence of blockage of the wavy trays, enhance the mass transfer effect, and ultimately achieve the purpose of improving the preparation efficiency.

[0016] 2. For the reactive distillation column for ethylene glycol preparation of the present invention, during the scraping process, the one-way intake valve on the sleeve plate supplies air unidirectionally into the cavity formed between the scraper and the sleeve plate, and the air flows out through the exhaust holes inclined upward at the scraping part of the scraper to form a directional air flow. On the one hand, this air flow can "sweep" the scraped impurities to the discharge port of the discharge shell to avoid the accumulation of impurities in front of the scraper. On the other hand, the ejected air flow can enhance the disturbance of the gas-liquid two-phase in the tower and strengthen the mass transfer effect.

[0017] 3. For the reactive distillation column for ethylene glycol preparation of the present invention, through the combined use of the magnetic block of the rolling attraction mechanism and the scraping mechanism, when the scraping mechanism moves, the magnetic block rotates accordingly. During the rotation of the magnetic block, a magnetic field effect will be generated periodically, attracting the ejecting mechanism. Under the periodic attraction of the magnetic block, the ejecting pipe of the ejecting mechanism will intermittently eject into the air holes of the wavy trays, and the blockage in the air holes will be removed through this physical action, thereby ensuring the smooth flow of steam in the wavy trays and effectively reducing the possibility of blockage of the trays. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of a reactive distillation column for ethylene glycol preparation proposed by the present invention.

[0019] Figure 2 It is a schematic diagram of the internal partial structure of a reactive distillation column for ethylene glycol preparation proposed by the present invention.

[0020] Figure 3 It is a schematic diagram of the internal sectional structure of a reactive distillation column for ethylene glycol preparation proposed by the present invention.

[0021] Figure 4 It is a diagram of the liquid flow direction in a reactive distillation column for ethylene glycol preparation proposed by the present invention.

[0022] Figure 5 This is a schematic structural diagram of a rolling attraction mechanism in a reactive distillation column for preparing ethylene glycol proposed by the present invention.

[0023] Figure 6 This is a schematic side sectional view of a scraping mechanism in a reactive distillation column for preparing ethylene glycol proposed by the present invention.

[0024] In the figure: 1. Rectifying column body; 101. Flow channel; 2. Wavy tray; 3. Discharge housing; 4. Flipping member; 41. Flipping plate; 42. Thrust rod; 5. Scraping mechanism; 51. Sleeve plate; 52. Scraper; 521. Exhaust hole; 53. Return spring; 54. One-way intake valve; 55. Rolling disc; 6. Rolling attraction mechanism; 61. Mounting block; 62. Rotating rod; 63. Rotating column; 64. Magnet; 65. Transmission rod; 7. Ejecting mechanism; 71. Telescopic tube; 72. Ejecting pipe; 73. Wavy screen; 8. Guiding and returning member; 81. Diagonal tension spring; 82. Connecting block; 83. Guide rod; 9. Extraction pump; 10. Connecting housing; 11. Driving member; 111. Driving motor; 112. Winding rod; 113. Pulling rope; 12. Flow guiding housing. Detailed implementation manners

[0025] Now, the subject matter described herein will be discussed with reference to exemplary embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the scope of protection of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described in some examples can also be combined in other examples.

[0026] As Figures 1 to 3 and Figure 6 shown, a reactive distillation column for preparing ethylene glycol according to an embodiment of the present invention includes a rectifying column body 1, a wavy tray 2, a discharge housing 3, a flipping member 4, a scraping mechanism 5, a rolling attraction mechanism 6, an ejecting mechanism 7, a guiding and returning member 8, an extraction pump 9, and a connecting housing 10; The corrugated tray 2 is installed inside the rectification tower body 1. The middle part of the corrugated tray 2 is separated into two sub-corrugated trays by the discharge housing 3, and the two sub-corrugated trays are connected by a communication housing 10 to guide the ethylene glycol solution. The flipping member 4 is arranged on the discharge housing 3, and the guiding and restoring member 8 is connected to the scraping mechanism 5. The scraping mechanism 5 is connected to the driving member 11. When the driving member 11 drives the scraping mechanism 5 to scrape the corrugated tray 2, steam is simultaneously discharged. Impurities are scraped to the flipping member 4 and enter the discharge housing 3. At the same time, the rolling attraction mechanism 6 of the corrugated tray 2 intermittently attracts and triggers the ejecting mechanism 7 to act on the air holes of the corrugated tray 2. The extraction pump 9 is connected to the discharge housing 3 and the rectification tower body 1 to discharge the steam in the discharge housing 3 back to the rectification tower body 1.

[0027] The corrugated design of the corrugated tray 2 can increase the gas-liquid contact area and improve the mass transfer efficiency. The discharge housing 3 separates the corrugated tray 2 into two sub-trays, and the ethylene glycol solution is guided between the sub-trays through the communication housing 10 to form a flow path. The flipping member 4 is used to control the opening or closing of the discharge port of the discharge housing 3, and cooperates with the scraping mechanism 5 to introduce impurities into the discharge housing 3.

[0028] The scraping mechanism 5 is driven by the driving member 11 to move along the surface of the corrugated tray 2. The attached polymer or impurities are scraped off by the scraper 52. During the scraping process, an air flow is formed through the exhaust hole 521 and the one-way intake valve 54. On the one hand, the steam is sucked and discharged. On the other hand, when approaching the flipping member 4, the impurities are "blown" towards the flipping member 4 to avoid impurity accumulation. The rolling attraction mechanism 6 interacts with the magnetic member of the ejecting mechanism 7 through the magnetic block 64 to intermittently trigger the ejector pipe 72 to open the air hole of the corrugated tray 2, prevent the air hole from being blocked, and ensure the steam circulation. The extraction pump 9 pumps the steam in the discharge housing 3 back to the rectification tower body 1.

[0029] The scraping mechanism 5 is linked with the rolling attraction mechanism 6 to realize the dual cleaning function of "scraping impurities + dredging air holes", reduce the blockage of the tray 2, improve the rectification efficiency, the extraction pump 9 recovers the steam, improves the material utilization rate, and reduces the energy consumption.

[0030] As Figures 2 to 4 shown, multiple layers of corrugated trays 2 are arranged from top to bottom in the rectification tower body 1, and a notch is formed between each layer of corrugated tray 2 and the inner wall of the rectification tower body 1, and multiple notches are distributed in a staggered manner so that the multiple layers of corrugated trays 2 form an S-shaped flow path for the liquid. A diversion shell 12 is installed at the notch, and a flow channel 101 communicating with the diversion shell 12 is opened in the wall of the rectification tower body 1, and the liquid discharge port of the flow channel 101 is located at the next layer of corrugated tray 2.

[0031] The notch dislocation distribution of the multi-layer wavy tray 2 enables the ethylene glycol solution to flow along an S-shaped path, extending the residence time in the tower and enhancing the gas-liquid mass transfer effect. The diversion shell 12 cooperates with the flow channel 101 to guide the solution to flow downward layer by layer.

[0032] As Figure 3 shown, the flipping member 4 includes a flipping plate 41 and a push rod 42. A discharge opening is formed on the discharge shell 3. The flipping plate 41 is hinged at the discharge opening and connected to the push rod 42.

[0033] The flipping plate 41 of the flipping member 4 is hinged to the discharge opening of the discharge shell 3, and the flipping angle is controlled by the push rod 42. When the scraping mechanism 5 pushes the impurities to the discharge opening, the push rod 42 is pushed by the scraping mechanism 5 to flip the flipping plate 41 to open the discharge opening, and the impurities fall into the discharge shell 3. After scraping is completed, the flipping plate 41 resets to close the discharge opening to prevent steam leakage in the tower.

[0034] As Figure 3 、 Figure 5 and Figure 6 shown, the scraping mechanism 5 includes a sleeve plate 51, a scraping plate 52, a return spring 53 and a one-way air inlet valve 54. The sleeve plate 51 is connected to the guiding and returning member 8. The scraping plate 52 slides into the interior of the sleeve plate 51 and is connected to the inner top wall of the sleeve plate 51 through the return spring 53. A cavity that communicates with each other is formed in both the scraping plate 52 and the sleeve plate 51. An exhaust hole 521 that is inclined upward and communicates with the cavity is formed at the scraping part of the scraping plate 52. A one-way discharge valve (not shown in the figure) is provided at the exhaust hole 521. The one-way air inlet valve 54 is provided on the sleeve plate 51 to supply air to the cavity unidirectionally.

[0035] In the scraping mechanism 5, the scraping plate 52 can slide up and down in the sleeve plate 51 through the return spring 53. When the scraping plate 52 contacts the wavy tray 2, the return spring 53 is compressed and contracted, so that the scraping plate 52 clings to the surface of the tray to ensure the scraping effect. Since the cavity space is relatively large at this time and a negative pressure is formed inside, the one-way air inlet valve 54 supplies air to the cavity unidirectionally, and the air flow sprays obliquely upward through the exhaust hole 521 to spray the sucked steam, increasing the mass transfer effect with the liquid and at the same time preventing impurities from accumulating in front of the scraping plate 52.

[0036] Furthermore, a rolling disc 55 is rotatably connected to the scraping plate 52 through a rotating shaft, and the rolling disc 55 is in rolling connection with the wavy tray 2. The scraping part of the scraping plate 52 is flexibly arranged.

[0037] The rolling disc 55 on the scraping plate 52 is rotatably connected to the scraping plate 52 through a rotating shaft. When the scraping mechanism 5 moves along the wavy tray 2, the rolling disc 55 rolls on the surface of the wavy tray 2, converting sliding friction into rolling friction, reducing the movement resistance, and the scraping part of the scraping plate 52 presses against the wavy tray 2 for scraping.

[0038] As Figure 3 andFigure 5 As shown, the rolling attraction mechanism 6 includes a mounting block 61, a rotating rod 62, a rotating column 63 and a magnetic block 64. The mounting block 61 is installed on the sleeve plate 51. The rotating column 63 is rotatably connected to the mounting block 61 through the rotating rod 62. The magnetic block 64 is embedded in the rotating column 63. There are multiple magnetic blocks 64, which are distributed at intervals. A transmission rod 65 that transmits power to the rotating rod 62 is installed on the inner wall of the distillation tower body 1.

[0039] In the rolling attraction mechanism 6, the rotating rod 62 is transmitted through the transmission rod 65. When the scraping mechanism 5 moves, the rotating rod 62 moves and rotates in the length direction of the transmission rod 65, causing the magnetic block 64 to periodically approach or move away from the ejection mechanism 7. The interval distribution of the magnetic block 64 makes the magnetic attraction intermittent.

[0040] like Figure 2 and Figure 3 As shown, the ejection mechanism 7 includes a telescopic tube 71, a top pipe 72 and a wavy screen 73. The telescopic tube 71 is installed on the discharge shell 3, and its movable end is connected to the wavy screen 73. There are multiple top pipes 72, and multiple top pipes 72 are installed on the wavy screen 73 and are arranged corresponding to the air holes on the tower plate 2. The wavy screen 73 is inlaid with magnetic parts to adsorb with the magnetic block 64. The magnetic parts are magnetic sheets.

[0041] When the magnetic block 64 acts on the magnetic part periodically, the magnetic force pulls the wavy screen 73, and the push tube 72 rises and pushes into the air hole to clear the blockage. After the magnetic force weakens, the telescopic tube 71 returns to its original position, completing one unblocking.

[0042] like Figure 3 As shown, the guide return member 8 includes an inclined spring 81, a connecting block 82 and a guide rod 83. The connecting block 82 is installed on the sleeve plate 51. One end of the inclined spring 81 is hinged to the distillation tower body 1, and the other end is hinged to the connecting block 82. The guide rod 83 is installed on the discharge shell 3, and one end of the guide rod 83 slides through the connecting block 82.

[0043] In the guide return member 8, the oblique tension spring 81 provides a restoring force, and the connecting block 82 limits the moving direction of the sleeve 51 through the guide rod 83, ensuring that the scraping mechanism 5 moves in a straight line. When the driving member 11 acts, the connecting block 82 overcomes the pulling force of the oblique tension spring 81 and moves along the guide rod 83; after the driving member 11 is released, the oblique tension spring 81 pulls the connecting block 82 to reset, thereby realizing the reciprocating motion of the scraping mechanism 5.

[0044] like Figure 3 As shown, the driving member 11 includes a driving motor 111, a winding rod 112 and a pull rope 113. The winding rod 112 is rotatably arranged in the middle of the distillation tower body 1 and is driven by the driving motor 111. One end of the pull rope 113 is fixedly connected to the winding rod 112, and the other end is fixedly connected to the connecting block 82.

[0045] The drive motor 111 of the driving member 11 drives the winding rod 112 to rotate, and pulls the connecting block 82 through the winding rope 113 to drive the scraping mechanism 5 to move along the corrugated tower plate 2.

[0046] Working principle: I. Solution separation and flow: The multi-layer corrugated tower plates 2 are installed in a staggered manner from top to bottom. Each layer of tower plate forms a notch with the inner wall of the rectifying tower body 1. The notch is communicated with the inner flow channel 101 of the tower wall through the diversion shell 12. The ethylene glycol solution enters the non-notch area of the first layer of tower plate from the top of the tower, flows along the wavy surface towards the notch, fully mass transfers with the rising steam, and then enters the lower corrugated tower plate 2 through the flow channel 101, forming an S-shaped descending path.

[0047] The middle part of each corrugated tower plate 2 is separated into left and right sub-tower plates by the discharge shell 3 and is connected through the diversion holes at the bottom of the communication shell 10, so that the solution flows from one sub-tower plate to the other, ensuring uniform distribution of the solution on the same layer.

[0048] II. Cleaning: The drive motor 111 drives the winding rod 112 to rotate, and pulls the connecting block 82 through the rope 113, so that the sleeve plate 51 moves along the guide rod 83 towards the discharge shell 3. The scraper 52 elastically fits the surface of the corrugated tower plate 2 through the return spring 53 to scrape off the attached polymer or impurities.

[0049] The rolling disc 55 rolls with the scraper 52, and the one-way air inlet valve 54 supplies air to the cavity between the sleeve plate 51 and the scraper 52. When the convex part of the corrugated tower plate 2 enters the inside of the sleeve plate 51, the volume of the cavity between the scraper 52 and the sleeve plate 51 decreases, and the air flow is ejected obliquely upward through the exhaust hole 521, which can act on the liquid with the inhaled steam for mass transfer.

[0050] When the polymer and impurities are scraped to the discharge port of the discharge shell 3, the sleeve plate 51 pushes the ejector rod 42, and the ejector rod 42 drives the turning plate 41 to rotate around the hinge point to open the discharge port. Along with the steam discharged from the exhaust hole 521, the impurities fall into the discharge shell 3. When the scraping mechanism 5 returns, the turning plate 41 resets under the action of gravity to close the discharge port to prevent steam leakage.

[0051] When the scraping mechanism 5 moves, the rotating rod 62 moves and rotates along the transmission rod 65 (a gear is sleeved on the rotating rod 62, and a rack for gear transmission is installed on the transmission rod 65), driving the magnetic block 64 to rotate.

[0052] When the magnetic block 64 is aligned with the magnetic part (magnetic sheet) of the corrugated screen 73, the magnetic force acts on the corrugated screen 73 to move upward, so that the top pipe 72 is inserted into the air hole of the corrugated tower plate 2 to eject the blockage. After the magnetic block 64 rotates away, the magnetic force weakens, and the corrugated screen 73 resets to complete a dredging cycle.

[0053] Intermittent dredging logic: The circumferential uniform distribution of the magnetic block 64 causes the jacking pipe 72 to act at a fixed frequency.

[0054] Steam recovery: The extraction pump 9 is connected to the discharge housing 3 and the rectification tower body 1 through a pipeline, and the steam in the discharge housing 3 is pumped back into the rectification tower body 1 to avoid waste.

[0055] Return and reset: The driving motor 111 rotates reversely, the winding rod 112 releases the pull rope 113, the diagonal tension spring 81 pulls the connecting block 82 to reset along the guide rod 83, driving the scraping mechanism 5 to return to the initial position, completing a cleaning cycle.

[0056] The embodiments of the present invention have been described above, but these embodiments are not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative rather than restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A reactive distillation column for preparing ethylene glycol, characterized in that, It includes a rectifying tower body (1), a wavy tray (2), a discharge housing (3), a turning member (4), a scraping mechanism (5), a rolling suction mechanism (6), an ejecting mechanism (7), a guiding and restoring member (8), a pumping unit (9) and a connecting housing (10); The wavy tray (2) is installed inside the rectifying tower body (1). The middle part of the wavy tray (2) is separated into two sub-wavy trays by the discharge housing (3), and the two sub-wavy trays are connected by the connecting housing (10) to guide the ethylene glycol solution; The turning member (4) is arranged on the discharge housing (3), and the guiding and restoring member (8) is connected to the scraping mechanism (5); The scraping mechanism (5) is connected to a driving member (11). When the driving member (11) drives the scraping mechanism (5) to scrape the wavy tray (2), steam is simultaneously pumped out to scrape impurities to the turning member (4) and enter the discharge housing (3). At the same time, the rolling suction mechanism (6) of the wavy tray (2) intermittently attracts and triggers the ejecting mechanism (7) to act on the air holes of the wavy tray (2); The pumping unit (9) connects the discharge housing (3) and the rectifying tower body (1) to discharge the steam in the discharge housing (3) back to the rectifying tower body (1).

2. The reactive distillation column for preparing ethylene glycol according to claim 1, wherein: The turning member (4) includes a turning plate (41) and a top rod (42). A discharge port is provided on the discharge housing (3). The turning plate (41) is hinged at the discharge port and is connected to the top rod (42).

3. The reactive distillation column for preparing ethylene glycol according to claim 1, wherein: The scraping mechanism (5) includes a sleeve plate (51), a scraper (52), a return spring (53) and a one-way air inlet valve (54). The sleeve plate (51) is connected to the guiding and restoring member (8). The scraper (52) slides into the interior of the sleeve plate (51) and is connected to the top wall inside the sleeve plate (51) through the return spring (53). Both the scraper (52) and the sleeve plate (51) form interconnected cavities. An exhaust hole (52) inclined upward and communicating with the cavity is provided at the scraping part of the scraper (52). The one-way air inlet valve (54) is arranged on the sleeve plate (51) to supply air to the cavity unidirectionally.

4. A reactive distillation column for preparing ethylene glycol according to claim 3, characterized in that: A rolling disc (55) is rotatably connected to the scraper (52) through a rotating shaft, and the rolling disc (55) is in rolling connection with the wavy tray (2).

5. A reactive distillation column for preparing ethylene glycol according to claim 1, characterized in that: The rolling suction mechanism (6) includes a mounting block (61), a rotating rod (62), a rotating column (63) and a magnetic block (64). The mounting block (61) is installed on the sleeve plate (51). The rotating column (63) is rotatably connected to the mounting block (61) through the rotating rod (62). The magnetic block (64) is embedded in the rotating column (63). The number of magnetic blocks (64) is multiple and they are distributed at intervals. A transmission rod (65) drivingly connected to the rotating rod (62) is installed on the inner wall of the rectifying tower body (1).

6. The reactive distillation column for preparing ethylene glycol according to claim 5, wherein: The ejecting mechanism (7) includes a telescopic tube (71), a top tube (72) and a corrugated screen (73). The telescopic tube (71) is installed on the discharge housing (3), and its movable end is connected to the corrugated screen (73). The number of top tubes (72) is multiple. The multiple top tubes (72) are installed on the corrugated screen (73) and are arranged corresponding to the air holes on the tray (2).

7. The reactive distillation column for preparing ethylene glycol according to claim 6, characterized in that: The wavy screen (73) is inlaid with magnetic members to adsorb to the magnetic blocks (64).

8. A reactive distillation column for preparing ethylene glycol according to claim 1, characterized in that: The guiding and restoring member (8) includes a diagonal tension spring (81), a connecting block (82) and a guide rod (83). The connecting block (82) is installed on the sleeve plate (51). One end of the diagonal tension spring (81) is hinged to the rectifying tower body (1), and the other end is hinged to the connecting block (82). The guide rod (83) is installed on the discharge housing (3), and one end of the guide rod (83) slidably passes through the connecting block (82).

9. The reactive distillation column for preparing ethylene glycol according to claim 8, wherein: The driving member (11) includes a driving motor (111), a winding rod (112) and a pulling rope (113). The winding rod (112) is rotatably arranged in the middle of the rectifying tower body (1) and is driven by the driving motor (111). One end of the pulling rope (113) is fixedly connected to the winding rod (112), and the other end is fixedly connected to the connecting block (82).

10. The reactive distillation column for preparing ethylene glycol according to claim 9, wherein: The wavy trays (2) are arranged in multiple layers from top to bottom in the rectifying tower body (1), and a notch is formed between each layer of the wavy trays (2) and the inner wall of the rectifying tower body (1). The multiple notches are distributed in a staggered manner so that the multiple layers of wavy trays (2) form an S-shaped flow path for the liquid. A diversion shell (12) is installed at the notch. A flow channel (101) communicating with the diversion shell (12) is opened in the wall of the rectifying tower body (1), and the liquid discharge port of the flow channel (101) is located at the next layer of the wavy tray (2).

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