Extraction and separation device for promoting acetic acid cracking to prepare acetic anhydride

Abstract

The invention belongs to the technical field of acetic acid extraction, and particularly relates to an extraction and separation device for preparing acetic anhydride by promoting acetic acid cracking, which comprises a tower body, a servo motor is arranged at the center of the outer wall of the top of the tower body, and an output shaft of the servo motor is fixedly connected with a water storage barrel through a coupler; and the outer wall of the vertical pipe is provided with an extracting agent release disc group with a liquid outlet hole. Dynamic adjustment formed by a mechanical linkage structure driven by a servo motor provides hardware support for flow collaboration, the adjusting precision and operation convenience are optimized through the synchronous control and visualization functions of the double-flow adjusting mechanism, and the device can be automatically matched with flow changes and can also be used for adjusting flow collaboration through the combination of the two mechanisms. The optimal ratio of the extraction agent to the mixed solution is ensured, sufficient mixing can be ensured through visual observation, and the extraction separation efficiency and the operation stability are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of acetic acid extraction technology, and more particularly to an apparatus for promoting the extraction and separation of acetic anhydride from acetic acid through cracking. Background Technology

[0002] Acetic acid pyrolysis to produce acetic anhydride is an important process in the field of organic chemical engineering. One of its core steps is the efficient separation and purification of the mixture of acetic acid, water, and the target product. In this process, acetic acid participates in the pyrolysis reaction as a raw material. After the reaction, unreacted acetic acid remains in the system, along with the generation of water as a byproduct. In the subsequent preparation of acetic anhydride, it is necessary to effectively separate acetic acid from water first, and then recycle or further process the purified acetic acid. Currently, industrially, extraction separation technology is commonly used to separate acetic acid from water. The principle is to utilize the highly selective solubility of acetic acid in the extractant, causing acetic acid to transfer from the aqueous phase to the extractant phase. Subsequently, separation equipment separates the extractant phase (containing acetic acid) from the raffinate phase (water), thereby achieving acetic acid recovery and water purification.

[0003] However, existing acetic acid cracking to acetic anhydride extraction and separation technologies have some shortcomings in practical applications:

[0004] Existing equipment is inconvenient to automatically and synchronously adjust the flow rate of the acetic acid and water mixture according to changes in the extractant flow rate. When the extractant flow rate fluctuates, the two-phase ratio is easily imbalanced, which affects the extraction efficiency. Furthermore, the equipment cannot achieve targeted and concentrated mixing of acetic acid, water and extractant in a specific area based on the water pressure difference caused by the flow rate change, nor can it intuitively understand the reaction between the various media inside the tower, which prolongs the mixing time and easily leads to insufficient mixing. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a device for promoting the extraction and separation of acetic anhydride from acetic acid through cracking. This device overcomes the deficiencies of existing technologies and effectively solves the problems of lack of flow rate coordination and adjustment mechanism, insufficient mixing, and inability to intuitively understand the reaction inside the tower.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An extraction and separation device for promoting the production of acetic anhydride from acetic acid cracking includes a tower body. A servo motor is installed at the center of the outer wall of the top of the tower body, and the output shaft of the servo motor is fixedly connected to a water storage tank via a coupling. A vertical pipe is fixedly connected to the outer wall of the bottom of the water storage tank via a flange, and an extractant release disc assembly with liquid outlet holes is installed on the outer wall of the vertical pipe. A mixed liquid collecting ring, a mixed liquid distribution pipe, and a mixed liquid spray pipe are respectively installed around the outside of the vertical pipe, and the mixed liquid collecting ring, the mixed liquid distribution pipe, and the mixed liquid spray pipe are connected in sequence.

[0008] The top of the outer wall of the vertical pipe is rotatably connected to an extractant collection hood, and the outer walls of the extractant collection hood and the mixed liquid collection ring are respectively welded with a first extractant inlet pipe and a first mixed liquid inlet pipe. A dual flow regulation mechanism is provided between the first extractant inlet pipe and the first mixed liquid inlet pipe. The dual flow regulation mechanism includes a sleeve, an end sleeve, a sealing cover, a flow synchronization adjustment seat, and a multi-stage separation observation component. The sealing cover is welded to the sleeve and the end sleeve, the flow synchronization adjustment seat is located inside the sleeve, and the multi-stage separation observation component is welded to the outer wall of one end of the flow synchronization adjustment seat.

[0009] Preferably, the dual flow regulating mechanism further includes a first sealing plate, a second sealing plate, and a partition plate, wherein the first sealing plate and the second sealing plate are both welded to the inner wall of the sleeve, and there are two partition plates, which are respectively disposed on one side of the first sealing plate and the second sealing plate.

[0010] Preferably, the flow synchronization regulating seat includes a connecting rod, an extractant plug, and a mixture plug. The connecting rod is slidably connected to the inner wall of the partition plate, the extractant plug is installed on the outer wall of one end of the connecting rod, and the mixture plug is installed on the other end of the outer wall of the connecting rod. The extractant plug and the mixture plug are respectively tightly attached to the inner walls of the first sealing plate and the second sealing plate. A spring is fixedly connected between the extractant plug and the partition plate near the second sealing plate.

[0011] Preferably, the multi-stage separation observation assembly includes a water-flushing sleeve, a first-stage separation display ring, a second-stage separation display ring, and a third-stage separation display ring. The water-flushing sleeve is welded to the outer wall of one end of the connecting rod. The first-stage separation display ring, the second-stage separation display ring, and the third-stage separation display ring are sequentially arranged on the outer wall of the water-flushing sleeve, and all three rings are tightly attached to the inner wall of the sealing cover. A transparent observation port is provided on one side of the outer wall of the sealing cover, and the first-stage separation display ring is located on the side closest to the transparent observation port.

[0012] Preferably, the sleeve is provided with an extractant inlet chamber, an extractant outlet chamber, a mixed liquid inlet chamber, and a mixed liquid outlet chamber in sequence inside the sleeve. The first extractant inlet pipe is connected to the interior of the extractant outlet chamber, the first mixed liquid inlet pipe is connected to the interior of the mixed liquid outlet chamber, the inner wall of the extractant inlet chamber is connected to a second extractant inlet pipe, and the inner wall of the mixed liquid inlet chamber is connected to a second mixed liquid inlet pipe. An extractant flushing pipe is fixedly connected to the outer wall of one side of the end sleeve, and the extractant flushing pipe and the second extractant inlet pipe are interconnected.

[0013] Preferably, an active lifting rod is provided inside the water storage cylinder and the vertical pipe, and a float plate is fixedly connected to the top outer wall of the active lifting rod. A first guide plate is fixedly connected to the outer wall of the active lifting rod inside the vertical pipe. Passive lifting rods are fixedly distributed at equal intervals on the bottom outer wall of the active lifting rod, and the passive lifting rods are slidably connected to the inner wall of the mixed liquid diversion pipe. A second guide plate is fixedly connected to the top outer wall of the mixed liquid diversion pipe.

[0014] Preferably, the extractant release disk group includes a primary extractant release disk, a secondary extractant release disk, and a tertiary extractant release disk arranged sequentially from top to bottom, wherein the primary extractant release disk, the secondary extractant release disk, and the tertiary extractant release disk correspond one-to-one with the primary separation display ring, the secondary separation display ring, and the tertiary separation display ring;

[0015] The inner wall of the tower body is welded with equidistantly distributed fixing rings outside the extractant release disk assembly, and the mixed liquid distribution pipe is located between the fixing rings and the extractant release disk assembly.

[0016] Preferably, the top of the inner wall of the tower body is provided with adjacent primary baffles and adjacent secondary baffles, the space between the two primary baffles is filled with primary packing material, and the space between the two secondary baffles is filled with secondary packing material. An acetic acid drain pipe is fixedly connected to the outer wall of the bottom of the tower body, and a drain pipe is fixedly connected to the outer wall of one side of the tower body between the primary packing material and the secondary packing material. An ethyl acetate drain pipe is fixedly connected to the outer wall of one side of the tower body above the secondary packing material. A water storage cylinder is installed through the inner walls of the primary baffles, primary packing material, secondary baffles, and secondary packing material.

[0017] Preferably, the top of the outer wall of the vertical tube is provided with equidistantly distributed extractant confluence holes inside the extractant collection hood, and the outer wall of the vertical tube is provided with equidistantly distributed extractant diversion holes inside the extractant release disc assembly. The outer wall of the vertical tube is fixedly connected to a top sleeve and a bottom sleeve by screws, and the extractant release disc assembly is fixedly connected between the top sleeve and the bottom sleeve by screws.

[0018] Preferably, the tower body is provided with an acetic acid settling zone, a mixing zone, and a separation zone for separating ethyl acetate and water from bottom to top. The extractant release disk assembly, the mixed liquid spray pipe, and the fixing ring are all located inside the mixing zone, and the primary baffle, primary packing, secondary baffle, and secondary packing are all located inside the separation zone.

[0019] A motor mount is fixedly connected to the center of the outer wall at the top of the tower body by screws, and the servo motor is fixedly connected to the inner wall of the motor mount by screws. Observation tubes are provided at the bottom and top of the outer wall on one side of the tower body.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. The acetic anhydride extraction and separation device for promoting acetic acid cracking of the present invention, through the linkage structure of servo motor, water storage tank, vertical pipe, active lifting rod, float plate, first guide plate, passive lifting rod, mixed liquid diversion pipe and second guide plate, can adjust the position of the first guide plate and the second guide plate in real time according to the water pressure change caused by the amount of extractant entering, optimize the contact path between extractant and mixed liquid, improve the uniformity of the initial mixing of the two, and avoid local mixing imbalance caused by flow fluctuation;

[0022] 2. The acetic acid cracking to acetic anhydride extraction and separation device of the present invention, under the action of the dual flow regulation mechanism, realizes the synchronous regulation of the flow rate of the extractant and the mixed liquid through the linkage of the flow synchronous regulation seat and the spring, which solves the problem of the imbalance of the two phases. In addition, the water flushing sleeve of the multi-stage separation observation component moves with the water pressure, which can drive the separation display rings of each stage to appear at the transparent observation port, which can intuitively reflect the mixing reaction area under different flow rates inside the tower, making it easy for operators to grasp the working conditions in real time and reduce the situation of insufficient mixing.

[0023] 3. The acetic acid cracking to acetic anhydride extraction and separation device of the present invention provides hardware support for flow coordination through the dynamic adjustment formed by the mechanical linkage structure driven by the servo motor. Furthermore, the synchronous control and visualization function of the dual flow adjustment mechanism optimizes the adjustment accuracy and ease of operation. The combination of the two enables the device to automatically adapt to flow changes, ensuring the optimal ratio of extractant and mixture, and to ensure sufficient mixing through visual observation, thus significantly improving the extraction and separation efficiency and operational stability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of an acetic acid cracking to acetic anhydride extraction and separation device proposed in this invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the overall structure of an acetic acid cracking to acetic anhydride extraction and separation device proposed in this invention. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of the internal structure of the tower body of an extraction and separation device for promoting the cracking of acetic acid to produce acetic anhydride, as proposed in this invention.

[0027] Figure 4 This is a schematic diagram of the servo motor connection structure of an acetic acid pyrolysis to acetic anhydride extraction and separation device proposed in this invention.

[0028] Figure 5 This is a schematic diagram of the internal structure of the water storage tank and vertical pipe of an acetic anhydride extraction and separation device for promoting acetic acid cracking according to the present invention.

[0029] Figure 6This is a schematic diagram of the extractant release disk assembly, top cassette, and bottom cassette separation structure of an extraction and separation device for promoting the production of acetic anhydride from acetic acid cracking, as proposed in this invention.

[0030] Figure 7 for Figure 5 Enlarged schematic diagram of part A of the structure;

[0031] Figure 8 for Figure 5 Enlarged schematic diagram of part B structure;

[0032] Figure 9 This is a schematic diagram of a dual flow rate regulating mechanism for an acetic anhydride extraction and separation device that promotes acetic acid cracking to produce acetic anhydride, as proposed in this invention.

[0033] Figure 10 Based on Figure 9 A schematic diagram of the internal structure of the sealing cover;

[0034] Figure 11 Based on Figure 10 A schematic diagram of the internal structure of the sleeve and end sleeve;

[0035] Figure 12 Based on Figure 11 A schematic diagram of the flow synchronization regulating seat and the multi-stage separation observation component.

[0036] In the diagram: 1. Tower body; 2. Servo motor; 3. Water storage tank; 4. Vertical pipe; 5. Extractant release disc assembly; 6. Mixed liquid collection ring; 7. Mixed liquid diversion pipe; 8. Mixed liquid nozzle; 9. Active lifting rod; 10. Float plate; 11. Passive lifting rod; 12. Second guide plate; 13. Extractant collection hood; 14. First extractant inlet pipe; 15. First mixed liquid inlet pipe; 16. Dual flow regulation mechanism; 161. Sleeve; 162. End sleeve; 163. Sealing cover; 164. First sealing plate; 165. Second sealing plate; 166. Divider plate; 167. Flow synchronization adjustment seat; 168. Spring; 169. Multi-stage separation observation assembly; 17. Extractant flushing pipe; 18. Second mixed liquid inlet pipe; 19. Fixing ring; 20. First-stage partition plate; 21. Primary packing; 22. Secondary baffle; 23. Secondary packing; 24. Acetic acid manifold; 25. Drain pipe; 26. Ethyl acetate manifold; 27. Motor mount; 28. Observation tube; 29. ​​Extractant manifold; 30. Extractant diversion hole; 31. Top sleeve; 32. Bottom sleeve; 33. Mixing zone; 34. Acetic acid settling zone; 35. Separation zone; 36. Extractant inlet chamber; 37. Extractant outlet chamber; 38. Mixed liquid inlet chamber; 39. Mixed liquid outlet chamber; 40. Connecting rod; 41. Extractant plug; 42. Mixed liquid plug; 43. Water flushing sleeve; 44. Primary separation display ring; 45. Secondary separation display ring; 46. Tertiary separation display ring; 47. Transparent observation port; 48. Secondary extractant inlet pipe; 49. First guide plate. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] Reference Figures 1-12 Example 1: A device for promoting the extraction and separation of acetic anhydride from acetic acid cracking includes a tower body 1. A servo motor 2 is installed at the center of the outer wall of the top of the tower body 1, and the output shaft of the servo motor 2 is fixedly connected to a water storage tank 3 via a coupling. A vertical pipe 4 is fixedly connected to the outer wall of the bottom of the water storage tank 3 via a flange, and an extractant release disc assembly 5 with a liquid outlet hole is installed on the outer wall of the vertical pipe 4. A mixed liquid collecting ring 6, a mixed liquid diversion pipe 7, and a mixed liquid spray pipe 8 are respectively installed around the outside of the vertical pipe 4, and the mixed liquid collecting ring 6, the mixed liquid diversion pipe 7, and the mixed liquid spray pipe 8 are connected sequentially.

[0039] Through the above scheme, the servo motor 2 provides rotational power for the water storage cylinder 3 and the vertical pipe 4. The liquid outlet design of the extractant release disc group 5 facilitates the uniform release of the extractant. The sequential connection of the mixed liquid collection ring 6, the mixed liquid distribution pipe 7 and the mixed liquid spray pipe 8 constructs a complete channel for the mixed liquid from collection, distribution to spraying, laying a structural foundation for the full contact between the extractant and the mixed liquid, and ensuring that the mixed liquid can be accurately delivered to the area where it reacts with the extractant.

[0040] In embodiment two, an extractant collection hood 13 is rotatably connected to the top of the outer wall of the vertical pipe 4. A first extractant inlet pipe 14 and a first mixed liquid inlet pipe 15 are welded to the outer walls of the extractant collection hood 13 and the mixed liquid collection ring 6, respectively. A dual flow rate regulating mechanism 16 is provided between the first extractant inlet pipe 14 and the first mixed liquid inlet pipe 15. The dual flow rate regulating mechanism 16 includes a sleeve 161, an end sleeve 162, a sealing cover 163, a flow rate synchronization regulating seat 167, and a multi-stage separation observation assembly 169. The sealing cover 163 is welded to the sleeve 161. 61 and end sleeve 162, flow synchronization adjustment seat 167 is disposed inside sleeve 161, multi-stage separation observation assembly 169 is welded to the outer wall of one end of flow synchronization adjustment seat 167, the dual flow adjustment mechanism 16 also includes a first sealing plate 164, a second sealing plate 165, and a partition plate 166, wherein the first sealing plate 164 and the second sealing plate 165 are both welded to the inner wall of sleeve 161, and there are two partition plates 166, and the two partition plates 166 are respectively disposed on one side of the first sealing plate 164 and the second sealing plate 165.

[0041] Through the above scheme, the rotatable connection between the extractant collection hood 13 and the vertical pipe 4 ensures that the extractant can still enter stably when the vertical pipe 4 rotates. The first extractant inlet pipe 14 and the first mixed liquid inlet pipe 15 provide delivery channels for the extractant and the mixed liquid, respectively. In the dual flow regulation mechanism 16, the sleeve 161, the end sleeve 162 and the sealing cover 163 form a closed regulation space to avoid fluid leakage. The first sealing plate 164, the second sealing plate 165 and the two partition plates 166 divide the inside of the sleeve 161 into independent compartments to realize the diversion regulation of the extractant and the mixed liquid. Through the cooperation of the flow synchronization regulating seat 167 and the multi-stage separation observation component 169, the coordinated control of the flow of the two is ensured, and the internal reaction status can be fed back in real time, improving the stability and controllability of the device operation.

[0042] In embodiment three, an active lifting rod 9 is provided inside the water storage cylinder 3 and the vertical pipe 4, and a float plate 10 is fixedly connected to the top outer wall of the active lifting rod 9. A first guide plate 49 is fixedly connected to the outer wall of the active lifting rod 9 inside the vertical pipe 4. Passive lifting rods 11 are fixedly distributed at equal intervals on the bottom outer wall of the active lifting rod 9, and the passive lifting rods 11 are slidably connected to the inner wall of the mixed liquid diversion pipe 7. A second guide plate 12 is fixedly connected to the top outer wall of the mixed liquid diversion pipe 7.

[0043] Through the above scheme, the float 10 uses the buoyancy of water to control the initial position and lifting state of the active lifting rod 9. The movement of the active lifting rod 9 drives the first guide plate 49 to adjust its position in the vertical pipe 4, thereby changing the flow position of the extractant in the vertical pipe 4 and optimizing the distribution of the extractant. The sliding cooperation between the passive lifting rod 11 and the mixed liquid distribution pipe 7 enables the active lifting rod 9 to drive the second guide plate 12 to move synchronously. The second guide plate 12 can adjust the flow state of the mixed liquid in the mixed liquid distribution pipe 7, realizing the coordinated adjustment of the flow state of the extractant and the mixed liquid, and further improving the uniformity of the mixing.

[0044] The flow synchronization regulating seat 167 includes a connecting rod 40, an extractant plug head 41, and a mixed liquid plug head 42. The connecting rod 40 is slidably connected to the inner wall of the partition plate 166. The extractant plug head 41 is installed on the outer wall of one end of the connecting rod 40, and the mixed liquid plug head 42 is installed on the other end of the outer wall of the connecting rod 40. The extractant plug head 41 and the mixed liquid plug head 42 are respectively tightly attached to the inner walls of the first sealing plate 164 and the second sealing plate 165. A spring 168 is fixedly connected between the extractant plug head 41 and the partition plate 166 near the second sealing plate 165.

[0045] Through the above scheme, the sliding of the connecting rod 40 within the partition plate 166 provides support for the linkage between the extractant plugging head 41 and the mixture plugging head 42; through the tight fit between the extractant plugging head 41 and the first sealing plate 164 and the mixture plugging head 42 and the second sealing plate 165, effective sealing and opening / closing control of the extractant and mixture channels is achieved; the elastic action of the spring 168 enables the extractant plugging head 41 and the mixture plugging head 42 to automatically adjust their positions according to the fluid pressure, thereby changing the flow area of ​​the channels, realizing the synchronous and dynamic adjustment of the flow rates of the extractant and the mixture, and ensuring that the ratio of the two is always in the optimal extraction state.

[0046] The multi-stage separation observation assembly 169 includes a water-flushing sleeve 43, a first-stage separation display ring 44, a second-stage separation display ring 45, and a third-stage separation display ring 46. The water-flushing sleeve 43 is welded to the outer wall of one end of the connecting rod 40. The first-stage separation display ring 44, the second-stage separation display ring 45, and the third-stage separation display ring 46 are sequentially arranged on the outer wall of the water-flushing sleeve 43, and all three are tightly attached to the inner wall of the sealing cover 163. A transparent observation port 47 is provided on one side of the outer wall of the sealing cover 163, and the first-stage separation display ring 44 is located on the side closest to the transparent observation port 47.

[0047] Through the above scheme, the fixed connection between the water flushing sleeve 43 and the connecting rod 40 allows the displacement of the connecting rod 40 to synchronously drive the water flushing sleeve 43 to move. The primary separation display ring 44, the secondary separation display ring 45, and the tertiary separation display ring 46 move within the sealing cover 163 along with the displacement of the water flushing sleeve 43. The transparent observation port 47 provides the operator with a window to observe the positions of the primary separation display ring 44, the secondary separation display ring 45, and the tertiary separation display ring 46. Based on the display status of the primary separation display ring 44, the secondary separation display ring 45, and the tertiary separation display ring 46 at the transparent observation port 47, the current flow rate of the extractant and the mixture, as well as the corresponding area, can be intuitively determined, facilitating timely adjustment of operating parameters and ensuring stable and efficient reaction inside the tower 1.

[0048] The sleeve 161 is provided with an extractant inlet chamber 36, an extractant outlet chamber 37, a mixed liquid inlet chamber 38, and a mixed liquid outlet chamber 39 arranged in sequence inside the sleeve. The first extractant inlet pipe 14 is connected to the interior of the extractant outlet chamber 37, and the first mixed liquid inlet pipe 15 is connected to the interior of the mixed liquid outlet chamber 39. The inner wall of the extractant inlet chamber 36 is connected to the second extractant inlet pipe 48, and the inner wall of the mixed liquid inlet chamber 38 is connected to the second mixed liquid inlet pipe 18. An extractant flushing pipe 17 is fixedly connected to the outer wall of one side of the sleeve 162, and the extractant flushing pipe 17 and the second extractant inlet pipe 48 are interconnected.

[0049] Through the above scheme, the orderly arrangement of each chamber in the sleeve 161 realizes the independent transport and temporary storage of the extractant and the mixture in the device, avoiding the two from mixing in advance before adjustment; the connection between the second extractant inlet pipe 48 and the extractant flushing pipe 17 provides a stable entry channel for the extractant, ensuring that the extractant can smoothly enter the extractant inlet chamber 36, constructing a complete fluid transport path, and ensuring that the extractant and the mixture can enter the subsequent reaction stage according to the predetermined process.

[0050] The extractant release disk group 5 includes a primary extractant release disk, a secondary extractant release disk, and a tertiary extractant release disk arranged sequentially from top to bottom. The primary extractant release disk, the secondary extractant release disk, and the tertiary extractant release disk correspond one-to-one with the primary separation display ring 44, the secondary separation display ring 45, and the tertiary separation display ring 46.

[0051] Through the above scheme, the design of the extractant release disc group 5 increases the sense of layering and coverage of extractant release; the one-to-one correspondence between the primary extractant release disc, the secondary extractant release disc, and the tertiary extractant release disc and the primary separation display ring 44, the secondary separation display ring 45, and the tertiary separation display ring 46 allows the operator to accurately determine the current release level and corresponding area of ​​the extractant based on the separation display rings displayed at the transparent observation port 47, which facilitates the adjustment of the release amount and release position of the extractant according to the actual working conditions, and improves the contact efficiency between the extractant and the mixture.

[0052] On the inner wall of the tower body 1, there are fixed rings 19 that are evenly distributed outside the extractant release disk group 5, and the mixed liquid diversion pipe 7 is located between the fixed rings 19 and the extractant release disk group 5.

[0053] With the above scheme, the mixing liquid distribution pipe 7 is located between the fixed ring 19 and the extractant release disk group 5, ensuring that the mixing liquid can quickly come into contact with the extractant released by the extractant release disk group 5 after being sprayed out from the mixing liquid distribution pipe 7, shortening the mixing path, reducing the mixing time, and improving the mixing fullness.

[0054] The top of the inner wall of the tower body 1 is provided with adjacent primary baffles 20 and adjacent secondary baffles 22. Primary packing 21 is filled between the two primary baffles 20, and secondary packing 23 is filled between the two secondary baffles 22. Acetic acid drain pipe 24 is fixedly connected to the bottom outer wall of the tower body 1. Drainage pipe 25 is fixedly connected to one side of the outer wall of the tower body 1 between the primary packing 21 and the secondary packing 23. Ethyl acetate drain pipe 26 is fixedly connected to one side of the outer wall of the tower body 1 above the secondary packing 23. A water storage cylinder 3 is installed through the inner walls of the primary baffles 20, primary packing 21, secondary baffles 22 and secondary packing 23.

[0055] Through the above scheme, the primary baffle 20 and the secondary baffle 22 provide support and installation foundation for the primary packing 21 and the secondary packing 23, respectively. The filling of the packing increases the contact area and residence time of the fluid in the separation zone 35, thereby improving the separation effect. The acetic acid drain pipe 24, the drain pipe 25 and the ethyl acetate drain pipe 26 provide independent discharge channels for the acetic acid, water and ethyl acetate generated in the reaction, respectively, so as to achieve effective separation and collection of the three substances. The water storage tank 3 is installed through the separation zone 35 to ensure that its rotation does not affect the normal operation of the separation zone 35.

[0056] The top of the outer wall of the vertical tube 4 is provided with equidistantly distributed extractant confluence holes 29 inside the extractant collection hood 13, and the outer wall of the vertical tube 4 is provided with equidistantly distributed extractant diversion holes 30 inside the extractant release disc assembly 5. The outer wall of the vertical tube 4 is fixedly connected to the top sleeve 31 and the bottom sleeve 32 by screws, and the extractant release disc assembly 5 is fixedly connected between the top sleeve 31 and the bottom sleeve 32 by screws.

[0057] With the above scheme, the extractant manifold 29 facilitates the rapid flow of extractant from the extractant collection hood 13 into the vertical pipe 4, while the extractant diversion 30 ensures that the extractant in the vertical pipe 4 is evenly distributed to the extractant release disc assembly 5. The top sleeve 31 and the bottom sleeve 32 are fixed to the vertical pipe 4 with screws, providing a stable installation structure for the extractant release disc assembly 5.

[0058] The tower body 1 is provided with an acetic acid settling zone 34, a mixing zone 33 and a separation zone 35 for separating ethyl acetate and water from bottom to top. The extractant release disk assembly 5, the mixed liquid spray pipe 8 and the fixing ring 19 are all located inside the mixing zone 33, and the primary baffle 20, the primary packing 21, the secondary baffle 22 and the secondary packing 23 are all located inside the separation zone 35.

[0059] Through the above scheme, the extractant release disk group 5, the mixed liquid nozzle 8 and other components in the mixing zone 33 ensure that the extractant and the mixed liquid are fully mixed and reacted; the separation zone 35 realizes the efficient separation of reaction products; and the acetic acid sedimentation zone 34 uses density differences to make acetic acid settle naturally, thereby improving the overall extraction and separation efficiency of the device.

[0060] A motor base 27 is fixedly connected to the center of the outer wall of the top of the tower body 1 by screws, and the servo motor 2 is fixedly connected to the inner wall of the motor base 27 by screws. Observation tubes 28 are provided at the bottom and top of the outer wall on one side of the tower body 1.

[0061] Through the above scheme, the motor base 27 provides a stable mounting foundation for the servo motor 2, and the setting of the observation tube 28 makes it convenient for the operator to observe the reaction at different heights inside the tower body 1 from the outside.

[0062] Working principle: When the device is started, the extractant enters the end sleeve 162 through the extractant flushing pipe 17. Under the action of water pressure, it pushes the connecting rod 40 of the flow synchronization adjustment seat 167 to move, thereby driving the extractant plugging head 41 and the mixed liquid plugging head 42 to adjust their positions synchronously, realizing the coordinated regulation of the flow rates of the extractant and the mixed liquid. At the same time, the extractant enters the extractant inlet chamber 36 through the second extractant inlet pipe 48, and then flows into the extractant collection hood 13 through the extractant discharge chamber 37 and the first extractant inlet pipe 14. Subsequently, it enters the vertical pipe 4 through the extractant manifold 29. The mixed solution of acetic acid and water enters the mixed liquid inlet chamber 38 through the second mixed liquid inlet pipe 18, and then flows into the mixed liquid collection ring 6 through the mixed liquid discharge chamber 39 and the first mixed liquid inlet pipe 15.

[0063] After the extractant enters the vertical pipe 4, it pushes the first guide plate 49 downward, causing the float 10 to descend with the active lifting rod 9, which in turn pulls the passive lifting rod 11 to drive the second guide plate 12 to move downward synchronously, optimizing the positions of both according to water pressure changes. The extractant in the vertical pipe 4 enters the extractant release disk group 5 through the extractant diversion hole 30, and is released upward by the primary extractant release disk, the secondary extractant release disk, and the tertiary extractant release disk; the mixed liquid is sprayed downward from the mixed liquid spray pipe 8 through the mixed liquid diversion pipe 7, and comes into contact with the extractant in the mixing zone 33;

[0064] During this process, when the extractant flushing tube 17 impacts the water flushing sleeve 43, the greater the water pressure, the greater the displacement of the water flushing sleeve 43, and the greater the flow rate of the mixture of extractant, acetic acid, and water. The primary separation display ring 44, secondary separation display ring 45, and tertiary separation display ring 46 on the surface of the water flushing sleeve 43 can selectively move to the transparent observation port 47 according to the displacement of the water flushing sleeve 43. This results in the following phenomenon: at low flow rates, the primary separation display ring 44 moves to the transparent observation port 47, and the mixture of extractant, acetic acid, and water concentrates in the primary extractant release area. The reaction occurs near the plate; at medium flow rates, the secondary separation display ring 45 moves to the transparent observation port 47, and the mixture of extractant, acetic acid, and water concentrates near the primary and secondary extractant release plates; at high flow rates, the tertiary separation display ring 46 moves to the transparent observation port 47, and the mixture of extractant, acetic acid, and water concentrates near the primary, secondary, and tertiary extractant release plates. Operators can visually judge the internal reaction area and flow rate matching status by observing the display rings near the transparent observation port 47.

[0065] Servo motor 2 is fixed by motor base 27 and drives water storage tank 3 and vertical pipe 4 to rotate, so that the mixture and extractant are fully mixed to generate ethyl acetate. Due to the density difference, acetic acid settles in acetic acid settling zone 34 and is discharged through acetic acid drain pipe 24; water flows upward, passes through primary baffle 20 and primary packing 21 in separation zone 35, and is discharged from drain pipe 25; ethyl acetate continues to rise, passes through secondary baffle 22 and secondary packing 23, and is discharged through ethyl acetate drain pipe 26, completing the entire extraction and separation process.

[0066] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for promoting the extraction and separation of acetic anhydride from acetic acid through pyrolysis, comprising a tower body (1), characterized in that, A servo motor (2) is installed at the center of the top outer wall of the tower body (1), and the output shaft of the servo motor (2) is fixedly connected to a water storage tank (3) through a coupling. A vertical pipe (4) is fixedly connected to the bottom outer wall of the water storage tank (3) through a flange. An extractant release plate group (5) with a liquid outlet hole is installed on the outer wall of the vertical pipe (4). A mixed liquid collecting ring (6), a mixed liquid diversion pipe (7) and a mixed liquid spray pipe (8) are respectively installed around the outside of the vertical pipe (4). The mixed liquid collecting ring (6), the mixed liquid diversion pipe (7) and the mixed liquid spray pipe (8) are connected in sequence. The top of the outer wall of the vertical pipe (4) is rotatably connected to an extractant collection hood (13), and the outer walls of the extractant collection hood (13) and the mixed liquid collection ring (6) are respectively welded with a first extractant inlet pipe (14) and a first mixed liquid inlet pipe (15). A dual flow regulation mechanism (16) is provided between the first extractant inlet pipe (14) and the first mixed liquid inlet pipe (15). The dual flow regulation mechanism (16) includes a sleeve (161), an end sleeve (162), a sealing cover (163), a flow synchronization adjustment seat (167), and a multi-stage separation observation component (169). The sealing cover (163) is welded to the sleeve (161) and the end sleeve (162), the flow synchronization adjustment seat (167) is located inside the sleeve (161), and the multi-stage separation observation component (169) is welded to the outer wall of one end of the flow synchronization adjustment seat (167).

2. The apparatus for promoting the extraction and separation of acetic anhydride from acetic acid via acetic acid cracking according to claim 1, characterized in that, The dual flow regulating mechanism (16) further includes a first sealing plate (164), a second sealing plate (165), and a partition plate (166). The first sealing plate (164) and the second sealing plate (165) are both welded to the inner wall of the sleeve (161). There are two partition plates (166), and the two partition plates (166) are respectively disposed on one side of the first sealing plate (164) and the second sealing plate (165).

3. The apparatus for promoting the extraction and separation of acetic anhydride from acetic acid via acetic acid cracking according to claim 2, characterized in that, The flow synchronization regulating seat (167) includes a connecting rod (40), an extractant plug (41), and a mixed liquid plug (42). The connecting rod (40) is slidably connected to the inner wall of the partition plate (166). The extractant plug (41) is installed on the outer wall of one end of the connecting rod (40), and the mixed liquid plug (42) is installed on the other end of the outer wall of the connecting rod (40). The extractant plug (41) and the mixed liquid plug (42) are respectively tightly attached to the inner walls of the first sealing plate (164) and the second sealing plate (165). A spring (168) is fixedly connected between the extractant plug (41) and the partition plate (166) near the second sealing plate (165).

4. The apparatus for promoting the extraction and separation of acetic anhydride from acetic acid via acetic acid cracking according to claim 3, characterized in that, The multi-stage separation observation assembly (169) includes a water-flushing sleeve (43), a first-stage separation display ring (44), a second-stage separation display ring (45), and a third-stage separation display ring (46). The water-flushing sleeve (43) is welded to the outer wall of one end of the connecting rod (40). The first-stage separation display ring (44), the second-stage separation display ring (45), and the third-stage separation display ring (46) are sequentially arranged on the outer wall of the water-flushing sleeve (43). The first-stage separation display ring (44), the second-stage separation display ring (45), and the third-stage separation display ring (46) are all tightly attached to the inner wall of the sealing cover (163). A transparent observation port (47) is provided on one side of the outer wall of the sealing cover (163), and the first-stage separation display ring (44) is located on the side close to the transparent observation port (47).

5. The apparatus for promoting the extraction and separation of acetic anhydride from acetic acid via acetic acid cracking according to claim 1, characterized in that, The sleeve (161) is provided with an extractant inlet chamber (36), an extractant outlet chamber (37), a mixed liquid inlet chamber (38), and a mixed liquid outlet chamber (39) in sequence inside. The first extractant inlet pipe (14) is connected to the interior of the extractant outlet chamber (37), and the first mixed liquid inlet pipe (15) is connected to the interior of the mixed liquid outlet chamber (39). The inner wall of the extractant inlet chamber (36) is connected to the second extractant inlet pipe (48), and the inner wall of the mixed liquid inlet chamber (38) is connected to the second mixed liquid inlet pipe (18). The outer wall of one side of the end sleeve (162) is fixedly connected to an extractant flushing pipe (17), and the extractant flushing pipe (17) and the second extractant inlet pipe (48) are interconnected.

6. The apparatus for promoting the extraction and separation of acetic anhydride from acetic acid via acetic acid cracking according to claim 1, characterized in that, The water storage cylinder (3) and the vertical pipe (4) are equipped with an active lifting rod (9), and a float plate (10) is fixedly connected to the top outer wall of the active lifting rod (9). A first guide plate (49) is fixedly connected to the outer wall of the active lifting rod (9) inside the vertical pipe (4). Passive lifting rods (11) are fixedly distributed at equal intervals on the bottom outer wall of the active lifting rod (9), and the passive lifting rods (11) are slidably connected to the inner wall of the mixed liquid diversion pipe (7). A second guide plate (12) is fixedly connected to the top outer wall of the mixed liquid diversion pipe (7).

7. The apparatus for promoting the extraction and separation of acetic anhydride from acetic acid via acetic acid cracking according to claim 1, characterized in that, The extractant release disk group (5) includes a first-stage extractant release disk, a second-stage extractant release disk and a third-stage extractant release disk arranged from top to bottom. The first-stage extractant release disk, the second-stage extractant release disk and the third-stage extractant release disk correspond one-to-one with the first-stage separation display ring (44), the second-stage separation display ring (45) and the third-stage separation display ring (46). The inner wall of the tower body (1) is welded with fixed rings (19) that are evenly distributed outside the extractant release disk group (5), and the mixed liquid distribution pipe (7) is located between the fixed rings (19) and the extractant release disk group (5).

8. The apparatus for promoting the extraction and separation of acetic anhydride from acetic acid via acetic acid cracking according to claim 1, characterized in that, The top of the inner wall of the tower body (1) is provided with adjacent primary partitions (20) and adjacent secondary partitions (22). The space between the two primary partitions (20) is filled with primary packing (21), and the space between the two secondary partitions (22) is filled with secondary packing (23). The bottom outer wall of the tower body (1) is fixedly connected with an acetic acid drain pipe (24), and the outer wall of one side of the tower body (1) is fixedly connected with a drain pipe (25) between the primary packing (21) and the secondary packing (23). The outer wall of one side of the tower body (1) is fixedly connected with an ethyl acetate drain pipe (26) above the secondary packing (23). The water storage cylinder (3) is installed through the inner walls of the primary partition (20), primary packing (21), secondary partition (22) and secondary packing (23).

9. The apparatus for promoting the extraction and separation of acetic anhydride from acetic acid via acetic acid cracking according to claim 1, characterized in that, The top of the outer wall of the vertical tube (4) is provided with extractant confluence holes (29) that are evenly distributed inside the extractant collection hood (13), and the outer wall of the vertical tube (4) is provided with extractant diversion holes (30) that are evenly distributed inside the extractant release disk assembly (5). The outer wall of the vertical tube (4) is fixedly connected with a top sleeve (31) and a bottom sleeve (32) by screws, and the extractant release disk assembly (5) is fixedly connected between the top sleeve (31) and the bottom sleeve (32) by screws.

10. The apparatus for promoting the extraction and separation of acetic anhydride from acetic acid via acetic acid cracking according to claim 1, characterized in that, The tower body (1) is provided with an acetic acid settling zone (34), a mixing zone (33) and a separation zone (35) for separating ethyl acetate and water from bottom to top. The extractant release disk assembly (5), the mixed liquid spray pipe (8) and the fixing ring (19) are all located inside the mixing zone (33), and the primary baffle (20), the primary packing (21), the secondary baffle (22) and the secondary packing (23) are all located inside the separation zone (35). The tower body (1) has a motor base (27) fixedly connected to the center of the top outer wall by screws, and the servo motor (2) is fixedly connected to the inner wall of the motor base (27) by screws. Observation tubes (28) are provided at the bottom and top of the outer wall on one side of the tower body (1).

Images