Catalytic device for preparing ethylene glycol diacetate

Abstract

The present invention relates to the technical field of ethylene glycol diacetate preparation, and discloses an ethylene glycol diacetate preparation catalysis device, which comprises a tower body, the tower body is internally provided with a rectifying section, a reaction section and a stripping section from top to bottom, the reaction section is internally provided with a catalysis mechanism, and the catalysis mechanism comprises a first limiting plate and a second limiting plate, the space between the first limiting plate and the second limiting plate is filled with catalyst filler, the second limiting plate is driven to vertically ascend and descend in the tower body, the second limiting plate is driven to descend in the using process, and the distance between the second limiting plate and the first limiting plate is increased in the descending process, that is, the space where the catalyst filler is located is enlarged, and the catalyst filler is more stable. And the phenomenon of crushing caused by expansion and extrusion among the catalyst fillers due to fixed space is reduced by utilizing space expansion.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of ethylene glycol diacetate, and specifically to a catalytic device for the preparation of ethylene glycol diacetate. Background Art

[0002] Catalytic distillation is a new process in which a solid catalyst is packed in a distillation column in an appropriate form, enabling the catalytic reaction and distillation separation to proceed continuously in the same column, and strengthening the reaction and separation processes by means of the coupling of reaction and separation. Among them, in the process of preparing ethylene glycol diacetate, a catalytic distillation column will be used.

[0003] For example, the patent with the publication number CN110478931B and the publication date of January 21, 2025 discloses a high-efficiency catalytic distillation column for the esterification of ethylene glycol and acetic acid. The interior of the catalytic distillation column includes three parts from top to bottom: the upper part is the rectifying section, the middle part is the catalytic reaction section, and the lower part is the stripping section. The rectifying section and the stripping section are filled with tower internals, and the catalytic reaction section is filled with a catalyst assembly; outside the tower: there is a gas phase outlet at the top of the tower; there is a reflux inlet at the upper part of the tower wall, and the reflux inlet is connected to the top of the rectifying section; there is an excess monomer inlet I in the upper middle part of the tower wall, and the excess monomer inlet I is connected to the bottom of the rectifying section; there is a mixture inlet for ethylene glycol, acetic acid, ethylene glycol monoacetate, and ethylene glycol diacetate in the middle part of the tower wall, and the mixture inlet for ethylene glycol, acetic acid, ethylene glycol monoacetate, and ethylene glycol diacetate is connected to the lower part of the catalytic reaction section; there is a discharge outlet at the bottom of the tower; the excess monomer inlet I is connected to a device capable of providing ethylene glycol.

[0004] As described in the above-mentioned published literature, a catalyst is installed inside the distillation column. There are four types of catalysts in total, namely the plate column packing method, the packed bed packing method, the suspension packing method, and the catalyst bulk packing. Among them, the catalyst bulk packing is mainly directly processed from ion exchange resin, and the main shapes can be divided into saddle-shaped and ring-shaped packings, etc. When using the catalyst bulk packing, because the catalyst bulk packing has a large surface area, it can enable the gas and liquid in the reaction system to come into full contact. However, due to the swelling characteristics unique to high molecular materials (ion exchange resin), during the process of using ion exchange resin to catalyze the synthesis of ethylene glycol diacetate from ethylene glycol and acetic acid, the ion exchange resin will expand due to the swelling characteristics, and most of the existing catalyst packings are stacked in a fixed space, resulting in the lack of space support for the expansion of the catalyst packing, that is, some of the catalyst bulk packing is crushed by extrusion in the reaction section, thus affecting the normal use of the catalyst packing. Summary of the Invention

[0005] The purpose of the present invention is to provide a catalytic device for the preparation of ethylene glycol diacetate to solve the above-mentioned deficiencies in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solution: A catalytic device for preparing ethylene glycol diacetate, including a tower body. Inside the tower body, a rectifying section, a reaction section, and a stripping section are arranged from top to bottom. A catalytic mechanism is arranged in the reaction section. The catalytic mechanism includes a first limiting plate and a second limiting plate. Between the first limiting plate and the second limiting plate, catalyst packing is filled. The second limiting plate is driven to vertically lift and lower inside the tower body.

[0007] Preferably, holes are formed in both the first limiting plate and the second limiting plate. The first limiting plate is fixedly connected to the inner wall of the tower body. The second limiting plate is slidably connected to the inner wall of the tower body. There is a certain distance between the first limiting plate and the second limiting plate, and a catalytic chamber is formed therebetween. The catalyst packing is located in this catalytic chamber.

[0008] Preferably, a driving mechanism is arranged inside the tower body. The driving mechanism drives the second limiting plate to vertically lift and lower inside the tower body.

[0009] Preferably, a slider is arranged on the side surface of the second limiting plate. A chute is formed on the inner wall of the tower body. The slider is located in the chute and forms a sliding guiding fit with the chute.

[0010] Preferably, an annular groove is formed in the second limiting plate, and a guiding inclined surface is provided. The guiding inclined surface is used to guide debris into the annular groove.

[0011] Preferably, a guiding plate is arranged on the second limiting plate. The guiding plate is located in the catalytic chamber. The guiding plate is fixedly connected to the upper surface of the second limiting plate. The guiding plate has a conical structure, and the outer surface of the guiding plate is the guiding inclined surface.

[0012] Preferably, a vibration assembly is arranged on the second limiting plate. The vibration assembly is used to drive the guiding plate to vibrate during the downward movement of the second limiting plate.

[0013] Preferably, the vibration assembly includes a dial rod and an annular protrusion. One end of the dial rod is fixedly connected to the lower end of the guiding plate. The annular protrusion is arranged on the inner wall of the tower body. The annular protrusion is located in the reaction section. The dial rod and the annular protrusion form a limiting and abutting fit. Multiple groups of annular protrusions are arranged and are arranged in sequence along the length direction of the tower body. An expansion rod is further arranged between the guiding plate and the second limiting plate. The upper and lower ends of the expansion rod are respectively fixedly connected to the guiding plate and the second limiting plate.

[0014] Preferably, a first hole is formed in the guiding plate. The first hole is used for upward steam to pass through the guiding plate.

[0015] Preferably, a second hole and a sandwich cavity are further formed inside the guiding plate. One end of the first hole communicates with the middle of the second hole. The bottom of the second hole communicates with the sandwich cavity.

[0016] The beneficial effects of the present invention are as follows: In the above technical solution, during the use of the second limiting plate of the present invention, it is driven to descend, and during the descending process, the distance between it and the first limiting plate is enlarged, that is, the space where the catalyst filler is located is increased. By expanding the space, the phenomenon of crushing caused by the expansion and extrusion between the catalyst fillers due to the fixed space is reduced. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a partial cross-sectional view of the tower body provided by the embodiment of the present invention;

[0019] Figure 2 It is a partial enlarged view inside the tower body provided by the embodiment of the present invention;

[0020] Figure 3 It is a schematic structural diagram of the second limiting plate provided by the embodiment of the present invention;

[0021] Figure 4 It is a cross-sectional view of the second limiting plate provided by the embodiment of the present invention;

[0022] Figure 5 Provided by the embodiment of the present invention Figure 2 Schematic structural diagram of the enlarged view at point A in

[0023] Figure 6 It is an internal cross-sectional view of the guide plate provided by another embodiment of the present invention;

[0024] Figure 7 Provided by the embodiment of the present invention Figure 6 Enlarged view at point B in

[0025] Description of the Reference Numerals:

[0026] 1. Tower body; 11. Rectifying section; 12. Reaction section; 13. Stripping section; 14. Slide groove; 15. Tray; 2. Catalytic mechanism; 21. First limiting plate; 22. Second limiting plate; 23. Catalyst filler; 24. Hole; 25. Catalytic chamber; 26. Slide block; 27. Annular groove; 3. Vibration assembly; 31. Guide plate; 32. Telescopic rod; 33. Poking rod; 34. First hole; 35. Second hole; 36. Interlayer cavity; 37. Annular protrusion; 4. Driving mechanism. Detailed Embodiments

[0027] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] As Figures 1-7 shown, the embodiment of the present invention provides a catalytic device for preparing ethylene glycol diacetate, which includes a tower body 1. Inside the tower body 1, a rectifying section 11, a reaction section 12, and a stripping section 13 are arranged from top to bottom. A catalytic mechanism 2 is arranged in the reaction section 12. The catalytic mechanism 2 includes a first limiting plate 21 and a second limiting plate 22. A catalyst packing 23 is filled between the first limiting plate 21 and the second limiting plate 22. The second limiting plate 22 is driven to vertically lift inside the tower body 1.

[0030] Specifically, the tower body 1 is arranged vertically and is hollow inside. The rectifying section 11, the reaction section 12, and the stripping section 13 divide the space inside the tower body 1 into three parts: upper, middle, and lower. The rectifying section 11, the reaction section 12, and the stripping section 13 are distributed in sequence from top to bottom. The inside of both the rectifying section 11 and the stripping section 13 is provided with trays 15. Among them, the catalytic mechanism 2 is installed in the reaction section 12. A feed pipe is provided at the position of the tower body 1 corresponding to the reaction section 12. Both the first limiting plate 21 and the second limiting plate 22 are provided with holes 24. The first limiting plate 21 is fixedly connected to the inner wall of the tower body 1, and the second limiting plate 22 is slidably connected to the inner wall of the tower body 1. There is a certain distance between the first limiting plate 21 and the second limiting plate 22, that is, a catalytic chamber 25 is formed between the two. The catalyst packing 23 is located in this catalytic chamber 25. The catalyst packing 23 is made of ion exchange resin and has structures such as saddle type, rectangular saddle ring type, or Pall ring type, etc. The top of the tower body 1 is connected to a condenser (not shown) through a pipeline. The condenser is used for condensing the liquid phase inside the tower body 1 and generating condensed water that flows back into the tower body 1. The bottom of the tower body 1 is connected to an evaporator (not shown) through a pipeline. The evaporator is used for heating and evaporating the liquid at the bottom of the tower, generating hot steam, that is, the gas phase rises from inside the tower body 1. The condenser and the evaporator are both prior arts and will not be elaborated;

[0031] During the actual use process, after the raw materials (ethylene glycol and acetic acid) are prepared in a certain proportion, they are input into the reaction section 12 from the feed pipe. The raw material liquid flows downward inside the tower body 1 and contacts the steam rising inside the tower body 1. When ethylene glycol and acetic acid flow through the surface of the catalyst packing 23, an esterification reaction occurs under the action of the catalyst packing 23, generating ethylene glycol diacetate and water. During the reaction process, the generated products and the unreacted raw materials will undergo gas-liquid mass transfer in the reaction section 12. Due to the different volatilities of each component, the easily volatile components (such as the generated water and a small amount of unreacted acetic acid, etc.) will preferentially vaporize and enter the gas phase, while the difficult-to-volatile components (such as ethylene glycol diacetate and part of the unreacted ethylene glycol) remain in the liquid phase. The gas-phase substances flow upward into the rectifying section 11, and the liquid-phase substances flow downward into the stripping section 13;

[0032] After the gas-phase substances rising from the reaction section 12 enter the rectifying section 11, they come into full contact with the liquid flowing back from the top of the tower body 1. The rectifying section 11 is equipped with trays 15, providing a large gas-liquid contact area. During the gas-liquid contact process, the easily volatile components continuously transfer from the liquid phase to the gas phase. Through multiple vaporization and condensation processes, the content of the easily volatile components (such as water, acetic acid, etc.) in the gas phase at the top of the tower gradually increases and is finally taken out from the top of the tower. The top product can be further processed to recover the valuable components therein or for subsequent separation operations;

[0033] After the liquid-phase substance descending from the reaction section 12 enters the stripping section 13, it undergoes gas-liquid exchange with the vapor rising from the bottom of the tower. The trays 15 installed in the stripping section 13 can promote the mass transfer process. The trays 15 are standard components of the catalytic distillation column of the present invention, which is prior art and will not be elaborated here;

[0034] In the stripping section 13, the less volatile components (such as ethylene glycol diacetate and some unreacted ethylene glycol) are continuously transferred from the gas phase to the liquid phase. After multiple mass transfer processes, the content of the less volatile components in the bottom liquid of the tower gradually increases, and finally, a higher-purity ethylene glycol diacetate product is withdrawn from the bottom of the tower. There may also be a small amount of substances such as unreacted ethylene glycol at the bottom of the tower, which can be recycled and reused;

[0035] After being used for a period of time, the second limiting plate 22 is driven to descend in the reaction section 12. Since the first limiting plate 21 is fixedly connected to the tower body 1, that is, the first limiting plate 21 always remains stationary. The descent of the second limiting plate 22 increases the distance between it and the first limiting plate 21, that is, axially stretches the catalytic chamber 25. That is to say, during the descent of the second limiting plate 22, because the axial dimension of the catalytic chamber 25 gradually increases while the radial dimension does not change, during the expansion process of the catalyst packing 23, it will not only expand axially but also expand radially. Therefore, during the descent of the second limiting plate 22, it can drive part of the catalyst packing 23 to descend synchronously. By using the descent of part of the catalyst packing 23, the catalyst packing 23 can move in the catalytic chamber 25. It can be understood that the axial stretching of the catalytic chamber 25 reduces the number of single catalyst packings 23 in the upward direction of its inner diameter and increases the number of single catalyst packings 23 in the axial direction inside it. Although the catalyst packing 23 expands both radially and axially, the expansion of the space of the catalytic chamber 25 reduces the phenomenon of crushing caused by the expansion and extrusion between the catalyst packings 23 due to the fixed space.

[0036] In another embodiment of the present invention, a driving mechanism 4 is provided inside the tower body 1, and the driving mechanism 4 drives the second limiting plate 22 to vertically lift and lower inside the tower body 1.

[0037] Specifically, a slider 26 is provided on the side surface of the second limiting plate 22, and a sliding groove 14 is formed on the inner wall of the tower body 1. The slider 26 is located in the sliding groove 14 and forms a sliding guiding fit with the sliding groove 14. The groove direction of the sliding groove 14 is consistent with the axial direction of the tower body 1. In this embodiment, the driving mechanism 4 is an electric push rod, and the electric push rod is fixedly installed inside the tower body 1. During actual use, as raw materials are continuously fed into the tower body 1, the catalyst packing 23 continuously undergoes an esterification reaction with the raw materials, that is, the catalyst packing 23 will continuously expand during the esterification reaction. The driving mechanism 4 intermittently drives the second limiting plate 22 to descend, that is, after a certain period of time, the driving mechanism 4 drives the second limiting plate 22 to descend by a certain height. The specific interval time can be determined according to the actual situation. Through the intermittent descent of the second limiting plate 22, that is, the axial stretching space of the single catalytic chamber 25 is relatively large, which helps the movement of the catalyst packing 23 in the catalytic chamber 25.

[0038] In the above embodiment, although the crushing of the catalyst packing 23 is reduced by the axial stretching of the catalytic chamber 25, during the intermittent axial stretching of the catalytic chamber 25 and the long-term use of the catalyst packing 23, the catalyst packing 23 may still be broken. The debris generated by the crushing will also enter the tray 15 along with the flow of the liquid, causing the sieve holes on the tray 15 to be blocked and affecting the subsequent gas-liquid mass transfer and heat transfer. Therefore, in another embodiment of the present invention, an annular groove 27 is formed on the second limiting plate 22, and a guiding inclined surface is provided. The guiding inclined surface is used to guide the debris into the annular groove 27.

[0039] Specifically, as Figure 3 and Figure 4 shown, a guiding plate 31 is provided on the second limiting plate 22. The guiding plate 31 is located in the catalytic chamber 25, and the catalyst packing 23 is located between the first limiting plate 21 and the guiding plate 31. The guiding plate 31 is fixedly connected to the upper surface of the second limiting plate 22. The guiding plate 31 has a conical structure, and the outer surface of the guiding plate 31 is the guiding inclined surface. The lower end of the guiding plate 31 is directly above the annular groove 27. During actual use, the liquid flowing in the catalytic chamber 25 finally flows onto the guiding inclined surface of the guiding plate 31. At the same time, the debris generated by the crushing of the catalyst packing 23 will also fall on the guiding inclined surface. The liquid and the debris move on the guiding inclined surface and finally enter the annular groove 27. After the annular groove 27 is filled with liquid, it will overflow from the top opening of the annular groove 27. Since the debris particles have a certain weight, the debris particles will accumulate at the bottom of the annular groove 27 and will not overflow with the liquid. The overflowing liquid flows onto the second limiting plate 22 and flows downward through the holes 24 on the second limiting plate 22, that is, the liquid enters the stripping section 13 for subsequent reactions.

[0040] In the above embodiment, in another embodiment of the present invention, a vibration assembly 3 is provided on the second limiting plate 22, and the vibration assembly 3 is used to drive the guide plate 31 to vibrate during the descent of the second limiting plate 22.

[0041] Specifically, the vibration assembly 3 includes a dial rod 33 and an annular protrusion 37. One end of the dial rod 33 is fixedly connected to the lower end of the guide plate 31. The annular protrusion 37 is provided on the inner wall of the tower body 1. The annular protrusion 37 is located in the reaction section 12. The dial rod 33 and the annular protrusion 37 form a limiting and abutting fit. A plurality of groups of annular protrusions 37 are provided and arranged in sequence along the length direction of the tower body 1. An expansion link 32 is further provided between the guide plate 31 and the second limiting plate 22. The upper and lower ends of the expansion link 32 are respectively fixedly connected to the guide plate 31 and the second limiting plate 22. The expansion link 32 is composed of two rod bodies. A receiving groove is opened inside one of the rod bodies, and a spring is installed inside the receiving groove. One end of the other rod body extends into the receiving groove and forms a sliding and guiding fit with the receiving groove, and the other end is fixedly connected to the guide plate 31. This elastically arranged expansion link 32 is a prior art and will not be elaborated. In the initial state, since the catalyst packing 23 is stacked on the guide plate 31, under the influence of the gravity of the catalyst packing 23, the expansion link 32 is initially in a contracted state;

[0042] During the actual use process, when the driving mechanism 4 drives the second limiting plate 22 to descend, it drives the guide plate 31 and the dial rod 33 thereon to descend synchronously. During the descent of the guide plate 31, the dial rod 33 contacts the annular protrusion 37, and the annular protrusion 37 blocks the further descent of the dial rod 33. Therefore, when the second limiting plate 22 continues to descend, the annular protrusion 37 will keep the dial rod 33 and the guide plate 31 stationary, and at the same time the expansion link 32 is gradually stretched until the second limiting plate 22 descends to a certain height, and the expansion link 32 is stretched to a certain length, that is, the spring in the expansion link 32 changes from a contracted state to a stretched state. At this time, the continued descent of the second limiting plate 22 will apply a downward pulling force to the guide plate 31. Since the dial rod 33 has a certain toughness, the dial rod 33 deforms after being subjected to the pulling force and crosses the annular protrusion 37. At the moment of crossing the annular protrusion 37, the guide plate 31 and the dial rod 33 lose the block of the annular protrusion 37, and the gravity of the catalyst packing 23 instantly presses down the guide plate 31 and causes the expansion link 32 to quickly contract. Also, since there are multiple groups of annular protrusions 37, during the rapid descent of the guide plate 31, the dial rod 33 contacts another group of annular protrusions 37 located below again. The collision generated by the rapid contact between the dial rod 33 and the annular protrusion 37 causes the guide plate 31 to vibrate. By vibrating, it assists the movement of the catalyst packing 23 on the guide plate 31, avoids the phenomenon that the catalyst packing 23 is stuck in the catalytic chamber 25 due to radial expansion, enables the descent of the guide plate 31 to smoothly drive the catalyst packing 23 to descend, and improves the extension space of a single catalyst packing 23.

[0043] In the above embodiment, due to the arrangement of the guide plate 31, the guide plate 31 covers directly above the hole 24 of the second limiting plate 22. Therefore, when the ascending steam in the tower body 1 passes through the hole 24 and enters between the second limiting plate and the guide plate 31, the upward hot steam can only flow above the guide plate 31 through the gap between the side surfaces of the guide plate 31 and the second limiting plate 22 and enter the catalyst packing 23. Due to the blockage of the guide plate 31, it is difficult for the upward hot steam to enter the catalyst packing 23 evenly, thus affecting the mass transfer and heat transfer between the hot steam and the liquid phase in the catalyst packing 23, and further affecting the rectification effect. Therefore, in another embodiment of the present invention, a first hole 34 is formed in the guide plate 31, and the first hole 34 is used for the ascending steam to pass through the guide plate 31. In this embodiment, the axial direction of the first hole 34 is consistent with the axial direction of the tower body 1 and is vertically arranged. The formation of the first hole 34 enables the upward hot steam to directly pass through the first hole 34 and enter the catalyst packing 23.

[0044] In another embodiment of the present invention, furthermore, in order to avoid the problem that debris enters the first hole 34 and causes blockage of the first hole 34, and the problem that the debris directly falls from the first hole 34, a second hole 35 and a sandwich cavity 36 are further formed inside the guide plate 31. One end of the first hole 34 communicates with the middle of the second hole 35, and the bottom of the second hole 35 communicates with the sandwich cavity 36.

[0045] Specifically, such as Figure 6 and Figure 7As shown, the first hole 34 has an L-shaped structure. A columnar body is provided in the interlayer cavity 36, and the first hole 34 passes through the columnar body, that is, the first hole 34 penetrates the interlayer cavity 36 by means of the columnar body. The interlayer cavity 36 has an approximately frustum-shaped structure, and the lower opening is also directly above the annular groove 27. The hole direction of the second hole 35 is consistent with the axial direction of the tower body 1. During actual use, the hot steam ascending in the tower body 1 will enter the interior of the first hole 34 after passing through the second limiting plate 22 and flow inside the first hole 34. Along with the hole direction of the first hole 34, it flows into the second hole 35 and flows out from the top opening of the second hole 35 as the hot steam rises, entering the catalyst packing 23. When the water and some debris in the catalyst packing 23 move to the guiding inclined surface of the guiding plate 31, some of the liquid and debris will flow into the annular groove 27 along the inclination direction of the guiding inclined surface, and the other part of the liquid and debris will flow into the second hole 35. Under the influence of gravity, the liquid and debris will directly be discharged into the interlayer cavity 36 from the bottom opening of the second hole 35, flow inside the interlayer cavity 36, and finally be discharged from the lower opening of the interlayer cavity 36. The discharged liquid and debris also enter the annular groove 27. In this embodiment, due to the relatively large aperture of the second hole 35 and the relatively high height of the interlayer cavity 36, the debris will not get stuck in the second hole 35 and the interlayer cavity 36. Moreover, the first hole 34 and the second hole 35 form a set of holes, and there are multiple sets of such combined holes. Through the setting of multiple sets of combined holes, while ensuring that the hot steam can uniformly pass through the guiding plate 31 and enter the catalyst packing 23, it can also prevent the debris from blocking the combined holes, and can also prevent the debris from directly passing through the combined holes and falling on the second limiting plate 22 and passing through the second limiting plate 22 and falling onto the lower tower plate 15, so that the debris can be effectively collected. Secondly, the guiding plate 31 will also generate vibrations during the descent of the second limiting plate 22, and this vibration can also promote the movement of the debris in the interlayer cavity 36, avoiding the blockage of the debris caused by the setting of the columnar body and preventing the debris from accumulating.

[0046] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A catalytic device for preparing ethylene glycol diacetate, comprising a tower body (1), wherein the tower body (1) is provided with a rectifying section (11), a reaction section (12) and a stripping section (13) from top to bottom, wherein a catalytic mechanism (2) is provided in the reaction section (12), characterized in that: The catalytic mechanism (2) comprises a first limiting plate (21) and a second limiting plate (22); a catalyst filler (23) is filled between the first limiting plate (21) and the second limiting plate (22); and the second limiting plate (22) is driven to vertically rise and fall in the tower body (1).

2. A catalytic device for preparing ethylene glycol diacetate according to claim 1, characterized in that: Holes (24) are provided on the first limiting plate (21) and the second limiting plate (22); the first limiting plate (21) is fixedly connected to the inner wall of the tower body (1); the second limiting plate (22) is slidably connected to the inner wall of the tower body (1); a certain distance is provided between the first limiting plate (21) and the second limiting plate (22); a catalytic chamber (25) is formed between the two, and a catalyst filler (23) is located in the catalytic chamber (25).

3. A catalytic device for preparing ethylene glycol diacetate according to claim 1, characterized in that: A driving mechanism (4) is arranged inside the tower body (1), and the driving mechanism (4) drives the second limiting plate (22) to vertically rise and fall inside the tower body (1).

4. A catalytic device for preparing ethylene glycol diacetate according to claim 1, characterized in that: A sliding block (26) is provided on the side of the second limiting plate (22), a sliding groove (14) is provided on the inner wall of the tower body (1), and the sliding block (26) is located in the sliding groove (14) and forms a sliding guide fit with the sliding groove (14).

5. A catalytic device for preparing ethylene glycol diacetate according to claim 1, characterized in that: The second limiting plate (22) is provided with an annular groove (27) and a guiding inclined surface, and the guiding inclined surface is used to guide the debris into the annular groove (27).

6. A catalytic device for preparing ethylene glycol diacetate according to claim 5, characterized in that: A guide plate (31) is disposed on the second limiting plate (22). The guide plate (31) is located in the catalytic chamber (25). The guide plate (31) is fixedly connected to the upper surface of the second limiting plate (22). The guide plate (31) is a conical structure, and the outer surface of the guide plate (31) is a guide slope.

7. A catalytic device for preparing ethylene glycol diacetate according to claim 6, characterized in that: A vibration assembly (3) is arranged on the second limit plate (22), and the vibration assembly (3) is used to drive the guide plate (31) to vibrate when the second limit plate (22) is descending.

8. A catalytic device for preparing ethylene glycol diacetate according to claim 7, characterized in that: The vibration assembly (3) comprises a lever (33) and an annular protrusion (37). One end of the lever (33) is fixedly connected to the lower end of the guide plate (31). The annular protrusion (37) is arranged on the inner wall of the tower body (1). The annular protrusion (37) is located in the reaction section (12). The lever (33) and the annular protrusion (37) form a limiting abutment fit. The annular protrusions (37) are provided in multiple groups and are arranged in sequence along the length direction of the tower body (1). A telescopic rod (32) is also provided between the guide plate (31) and the second limiting plate (22). The upper and lower ends of the telescopic rod (32) are respectively fixedly connected to the guide plate (31) and the second limiting plate (22).

9. A catalytic device for preparing ethylene glycol diacetate according to claim 6, characterized in that: The guide plate (31) is provided with a first hole (34), and the first hole (34) is used for the ascending steam to pass through the guide plate (31).

10. A catalytic device for preparing ethylene glycol diacetate according to claim 9, characterized in that: A second hole (35) and an interlayer cavity (36) are also provided inside the guide plate (31); one end of the first hole (34) is connected to the middle of the second hole (35); and the bottom of the second hole (35) is connected to the interlayer cavity (36).

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