A mixed xylene deolefining apparatus and method

Abstract

The application discloses a mixed xylene deolefin refining device and method, and relates to the technical field of mixed xylene refining. The device comprises a support plate, the inner side of the support plate is fixedly provided with an upper fixed plate and a lower fixed plate, the upper fixed plate is fixedly provided with a catalytic tank, the bottom end of the catalytic tank is fixedly connected with a shunt pipe, the shunt pipe is fixedly provided with a valve, the lower fixed plate is fixedly provided with a filter tank, and the end, away from the catalytic tank, of the shunt pipe is communicated with the filter tank. The filter tank is internally provided with a rough filtering cavity, a medium filtering cavity and a fine filtering cavity, the rough filtering cavity is fixedly provided with an activated carbon net rack in the inside, and the medium filtering cavity is fixedly provided with a filter screen in the inside. The device is provided with multi-stage filtering, dynamic adjustment and cleaning, reduces impurity accumulation and membrane blockage, improves the stability and processing capacity of the whole device, and effectively improves the efficiency and effect of mixed xylene deolefin refining.

Description

Technical Field

[0001] This invention relates to the field of mixed xylene refining technology, specifically to a mixed xylene deolefin refining apparatus and method. Background Technology

[0002] Xylene is an important basic chemical product, obtained from the reformate distillation column of a continuous reforming unit. Catalytic reforming product oil is rich in aromatics and solvent oil fractions, but also contains small amounts of olefins. These olefins are reactive and easily form gums; their presence can also affect some subsequent processing steps, such as aromatics extraction. To produce qualified aromatics and solvent oil products, the olefins must be removed.

[0003] In the prior art, Chinese Patent Publication No. CN106565400B discloses a mixed xylene deolefin refining apparatus and method. The reformed oil fraction is first pre-refined with clay to remove some olefins before entering a mixed xylene column for distillation. The mixed C8 fraction drawn from the side stream near the top of the column is refined by molecular sieves and then returned to the distillation column via a side stream, thus achieving deolefin refining. Clay pre-refining reduces the bromine index of the reformed oil and even the mixed C8 fraction. The feed for molecular sieve refining is obtained from the mixed xylene side stream, achieving refining only the mixed C8 fraction and reducing the olefin content of the feed. The discharge from the molecular sieve refining is returned via the mixed xylene column side stream, allowing the polymers generated in the reaction to be enriched in the column bottom and discharged along with the bottom product. This achieves the goal of separating polymers and obtaining qualified mixed xylene products without adding new separation columns or other equipment, solving the problems of existing devices having many valves and pipelines and frequent switching.

[0004] In the above-described scheme, during the refining process of mixed xylene, existing filters are used to filter impurities in the mixed xylene. However, some existing filters are prone to clogging due to the accumulation of impurities, resulting in reduced filtration efficiency and requiring frequent cleaning or replacement of the filter screen. Furthermore, some existing filters cannot perform multi-stage filtration and cannot effectively filter out all impurities in the mixed xylene, ultimately affecting the quality of the mixed xylene. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a mixed xylene deolefin refining apparatus and method, which solves the problems mentioned in the background section.

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

[0007] A mixed xylene deolefin refining device includes a support plate, an upper fixed plate and a lower fixed plate fixedly installed on the inner side of the support plate, a catalyst tank fixedly installed on the upper fixed plate, a diversion pipe fixedly connected to the bottom end of the catalyst tank, a valve fixedly installed on the diversion pipe, a filter tank fixedly installed on the lower fixed plate, and the end of the diversion pipe away from the catalyst tank connected to the filter tank.

[0008] The filter canister is provided with a coarse filtration chamber, a medium filtration chamber and a fine filtration chamber. An activated carbon mesh frame is fixedly installed inside the coarse filtration chamber. A filter screen is fixedly installed inside the medium filtration chamber. A flow guide ring is fixedly installed inside the fine filtration chamber. A fine filter frame membrane is rotatably installed on the inner side of the flow guide ring.

[0009] The filter tank is equipped with auxiliary components to improve the filtration effect of xylene in the filter tank.

[0010] Preferably, the auxiliary component includes a U-shaped frame plate fixedly installed at the bottom of the filter tank, a motor fixedly installed on the U-shaped frame plate, a rotating shaft fixedly installed at the output end of the motor, a small gear fixedly installed on the rotating shaft, an auxiliary rotating shaft rotatably installed at the inner bottom of the support plate, and a large gear fixedly installed on the auxiliary rotating shaft.

[0011] Preferably, the inner side of the auxiliary rotating shaft is provided with threads, and an adjusting nut is movably installed on the auxiliary rotating shaft via the threads. A lower pressure plate is fixedly installed on the adjusting nut, a lower pressure rod is fixedly installed on the lower pressure plate, and a piston plate is fixedly installed at the bottom end of the lower pressure rod.

[0012] Preferably, the end of the rotating shaft away from the motor extends into the interior of the fine filtration chamber and is fixedly installed with the inner bottom of the fine filtration membrane. The small gear meshes with the large gear. The end of the pressure rod away from the pressure plate extends into the interior of the coarse filtration chamber. The piston plate is slidably installed with the inner side of the coarse filtration chamber.

[0013] Preferably, a connecting shaft is rotatably mounted on the lower end face of the activated carbon mesh frame, an installation rod is fixedly mounted on the bottom end of the connecting shaft, an arc-shaped blade is fixedly mounted on the installation rod, a small pulley is fixedly mounted on the side end face of the connecting shaft, and a large pulley is fixedly mounted on the auxiliary rotating shaft.

[0014] Preferably, the arc-shaped blade slides in contact with the surface of the filter screen, and the small pulley and the large pulley are on the same horizontal plane and are driven by a belt.

[0015] Preferably, a bearing is fixedly installed on the lower end face of the piston plate, a rotating rod is fixedly installed on the bearing, a spiral pattern is formed on the side end face of the rotating rod, a flow divider is fixedly installed on the side end face of the rotating rod below the spiral pattern, an auxiliary plate is fixedly installed on the inner side of the guide ring, and a spiral hole is formed on the auxiliary plate.

[0016] Preferably, the end of the rotating rod away from the bearing extends into the interior of the fine filtration chamber, and the rotating rod is movably mounted via a helical thread and a helical hole.

[0017] A method for refining mixed xylenes by removing olefins, based on the mixed xylenes refining apparatus described above, includes the following steps:

[0018] S1. The mixed xylene is placed inside the catalytic tank. The olefins in the mixed xylene are converted into saturated hydrocarbons through hydrogenation to remove the olefin components. Then, the mixed xylene is placed inside the filter tank through a split pipe. The mixed xylene in the filter tank will pass through the coarse filter chamber, the medium filter chamber and the fine filter chamber in sequence. The coarse filtration is completed by the activated carbon mesh in the coarse filter chamber, the medium filtration is completed by the filter screen in the medium filter chamber, and finally the fine filtration is completed by the fine filter membrane in the fine filter chamber.

[0019] S2. Simultaneously, while filtering the mixed xylene, the motor drives the rotating shaft to rotate, which in turn drives the fine filter membrane to rotate. Centrifugal force is used to effectively discharge the mixed xylene from the fine filter membrane. At the same time, when the rotating shaft rotates, it drives the small gear to rotate. The small gear and the large gear work together, and the large gear drives the thread on the auxiliary rotating shaft to rotate. Through the engagement of the adjusting nut and the thread, the lower pressure plate on the adjusting nut drives the piston plate on the lower pressure rod to press down in the coarse filter chamber. The downward pressure allows the mixed xylene in the filter tank to pass more smoothly through the activated carbon mesh, filter screen and fine filter membrane during the filtration process, ensuring maximum filtration efficiency.

[0020] S3. When the auxiliary shaft rotates, it will synchronously drive the large pulley to rotate. The large pulley will drive the small pulley on the connecting shaft to rotate through the belt. The small pulley will drive the arc-shaped blade on the mounting rod to rotate through the connecting shaft. The arc-shaped blade effectively prevents too much impurity from accumulating in a certain place on the filter screen, ensuring the filtration effect of the filter screen.

[0021] S4. As the piston plate descends, it will simultaneously drive the rotating rod to descend. The rotating rod will engage with the spiral holes on the auxiliary plate through the spiral threads, and with the action of the bearing, it will be in a downward rotating motion. Through the opposite rotation of the diverting blades on the rotating rod and the fine filter membrane, the filtration effect of the mixed xylene in the fine filter membrane is improved.

[0022] This invention provides a mixed xylene deolefin purification apparatus and method. Compared with the prior art, it has the following advantages:

[0023] 1. In this invention, mixed xylene is placed inside a catalytic tank, and the olefins in the mixed xylene are converted into saturated hydrocarbons through a hydrogenation reaction to remove the olefin components. Then, the mixed xylene is placed inside a filter tank through a splitter. The mixed xylene in the filter tank will pass through a coarse filter chamber, a medium filter chamber, and a fine filter chamber in sequence. The coarse filter chamber uses an activated carbon mesh frame to complete the coarse filtration, the medium filter chamber uses a filter screen to complete the medium filtration, and finally the fine filter chamber uses a fine filter frame membrane to complete the fine filtration.

[0024] 2. In this invention, while filtering mixed xylene, a motor drives a rotating shaft to rotate, which in turn rotates the fine filter membrane. Centrifugal force is used to effectively discharge the mixed xylene from the fine filter membrane. Simultaneously, the rotation of the rotating shaft drives a small gear to rotate. The small gear, in conjunction with a large gear, drives the threaded part on the auxiliary rotating shaft to rotate. Through the engagement of the adjusting nut and the threaded part, the lower pressure plate on the adjusting nut drives the piston plate on the lower pressure rod to press down in the coarse filtration chamber. This downward pressure allows the mixed xylene in the filter tank to pass more smoothly through the activated carbon mesh, filter screen, and fine filter membrane during the filtration process, ensuring maximum filtration efficiency.

[0025] 3. In this invention, when the auxiliary rotating shaft rotates, it will synchronously drive the large pulley to rotate. The large pulley will drive the small pulley on the connecting shaft to rotate via the belt. The small pulley will drive the arc-shaped blade on the mounting rod to rotate via the connecting shaft. The arc-shaped blade effectively prevents excessive impurities from accumulating in a certain place on the filter screen, ensuring the filtration effect of the filter screen.

[0026] 4. In this invention, the piston plate descends synchronously with the rotating rod. The rotating rod engages with the spiral hole on the auxiliary plate through the spiral pattern and the bearing, thus moving in a downward rotational motion. The flow-diverting blades on the rotating rod and the fine filter membrane rotate in opposite directions, thereby improving the filtration effect of the mixed xylene in the fine filter membrane. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of the filter tank in this invention;

[0029] Figure 3 This is a schematic diagram of the auxiliary component in this invention;

[0030] Figure 4 This is a schematic diagram of the U-shaped frame plate in this invention;

[0031] Figure 5 This is a schematic diagram of the auxiliary rotating shaft in this invention;

[0032] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0033] Figure 7 This is a schematic diagram of the connecting shaft in this invention;

[0034] Figure 8 This is a schematic diagram of the rotating rod in this invention.

[0035] In the diagram: 1. Support plate; 2. Upper fixed plate; 3. Lower fixed plate; 4. Catalytic converter; 5. Diverter pipe; 6. Valve; 7. Filter tank; 8. Coarse filter chamber; 9. Medium filter chamber; 10. Fine filter chamber; 11. Activated carbon mesh frame; 12. Filter screen; 13. Guide ring; 14. Fine filter frame membrane; 15. U-shaped frame plate; 16. Motor; 17. Rotating shaft; 18. Small gear; 19. Auxiliary rotating shaft; 20. Large gear; 21. Thread; 22. Adjusting nut; 23. Lower pressure plate; 24. Lower pressure rod; 25. Piston plate; 26. Connecting shaft; 27. Mounting rod; 28. Arc-shaped blade; 29. ​​Small pulley; 30. Large pulley; 31. Bearing; 32. Rotating rod; 33. Spiral pattern; 34. Diverter blade; 35. Auxiliary plate; 36. Spiral hole. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figure 1-8 The present invention is a mixed xylene deolefin refining device, comprising a support plate 1, an upper fixed plate 2 and a lower fixed plate 3 fixedly installed on the inner side of the support plate 1, a catalyst tank 4 fixedly installed on the upper fixed plate 2, a diversion pipe 5 fixedly connected to the bottom end of the catalyst tank 4, a valve 6 fixedly installed on the diversion pipe 5, a filter tank 7 fixedly installed on the lower fixed plate 3, and the end of the diversion pipe 5 away from the catalyst tank 4 connected to the filter tank 7.

[0038] The filter tank 7 is internally equipped with a coarse filtration chamber 8, a medium filtration chamber 9, and a fine filtration chamber 10. An activated carbon mesh frame 11 is fixedly installed inside the coarse filtration chamber 8. A filter screen 12 is fixedly installed inside the medium filtration chamber 9. A flow guide ring 13 is fixedly installed inside the fine filtration chamber 10. A fine filter membrane frame 14 is rotatably installed on the inner side of the flow guide ring 13. An auxiliary component is provided on the filter tank 7 to improve the filtration effect of xylene within the filter tank 7. The coarse filtration chamber 8, the medium filtration chamber 9, and the fine filtration chamber 10 are in a connected state. A feed pipe is fixedly connected to the catalyst tank 4, and a discharge pipe is fixedly connected to the filter tank 7. Both the feed pipe and the discharge pipe are equipped with one-way valves. Since the one-way valve, the catalyst tank 4, and the valve 6 in this technical solution are all technologies well known to those skilled in the art, they will not be described in detail here.

[0039] In this embodiment, the mixed xylene is placed inside the catalytic tank 4, and the olefins in the mixed xylene are converted into saturated hydrocarbons through a hydrogenation reaction to remove the olefin components. Then, the mixed xylene is placed inside the filter tank 7 through the diversion pipe 5. The mixed xylene in the filter tank 7 will pass through the coarse filter chamber 8, the medium filter chamber 9 and the fine filter chamber 10 in sequence. The coarse filtration is completed by the activated carbon mesh frame 11 in the coarse filter chamber 8, the medium filtration is completed by the filter screen 12 in the medium filter chamber 9, and finally the fine filtration is completed by the fine filter frame membrane 14 in the fine filter chamber 10.

[0040] The auxiliary components include a U-shaped frame plate 15 fixedly installed at the bottom of the filter tank 7, a motor 16 fixedly installed on the U-shaped frame plate 15, a rotating shaft 17 fixedly installed at the output end of the motor 16, a small gear 18 fixedly installed on the rotating shaft 17, an auxiliary rotating shaft 19 rotatably installed at the inner bottom of the support plate 1, a large gear 20 fixedly installed on the auxiliary rotating shaft 19, a thread 21 provided on the inner side of the auxiliary rotating shaft 19, an adjusting nut 22 movably installed on the auxiliary rotating shaft 19 through the thread 21, a lower pressure plate 23 fixedly installed on the adjusting nut 22, a lower pressure rod 24 fixedly installed on the lower pressure plate 23, and a piston plate fixedly installed at the bottom end of the lower pressure rod 24. 25. The end of the rotating shaft 17 away from the motor 16 extends into the interior of the fine filter chamber 10 and is fixedly installed with the inner bottom of the fine filter frame membrane 14. The pinion 18 meshes with the large gear 20. The end of the pressure rod 24 away from the pressure plate 23 extends into the interior of the coarse filter chamber 8. The piston plate 25 is slidably installed with the inner side of the coarse filter chamber 8. The adjusting nut 22 will achieve the lifting and lowering movement through the cooperation of the pressure rod 24 and the filter can 7, without the phenomenon of angular rotation. When the pinion 18 rotates several times, the large gear 20 rotates at most a quarter turn, or less, to ensure that the large gear 20 drives the auxiliary rotating shaft 19 to rotate slowly.

[0041] In this embodiment, while filtering the mixed xylene, the motor 16 drives the rotating shaft 17 to rotate, which in turn drives the fine filter membrane 14 to rotate. Centrifugal force is used to effectively discharge the mixed xylene from the fine filter membrane 14. At the same time, when the rotating shaft 17 rotates, it drives the pinion 18 to rotate. With the cooperation of the pinion 18 and the large gear 20, the large gear 20 drives the thread 21 on the auxiliary rotating shaft 19 to rotate. Through the cooperation of the adjusting nut 22 and the thread 21, the lower pressure plate 23 on the adjusting nut 22 drives the piston plate 25 on the lower pressure rod 24 to press down in the coarse filter chamber 8. By pressing down, the mixed xylene in the filter tank 7 can pass more smoothly through the activated carbon mesh frame 11, the filter screen 12 and the fine filter membrane 14 during the filtration process, ensuring maximum filtration efficiency.

[0042] A connecting shaft 26 is rotatably mounted on the lower end face of the activated carbon mesh frame 11. An installation rod 27 is fixedly mounted on the bottom end of the connecting shaft 26. An arc-shaped blade 28 is fixedly mounted on the installation rod 27. A small pulley 29 is fixedly mounted on the side end face of the connecting shaft 26. A large pulley 30 is fixedly mounted on the auxiliary rotating shaft 19. The arc-shaped blade 28 slides in contact with the surface of the filter screen 12. The small pulley 29 and the large pulley 30 are on the same horizontal plane and are driven by a belt. A transmission through hole is provided on the filter tank 7 to facilitate the normal operation of the belt. Since the large pulley 30 and the small pulley 29 are different in size, it is effectively ensured that the large pulley 30 can drive the small pulley 29 to rotate when it rotates.

[0043] In this embodiment, when the auxiliary rotating shaft 19 rotates, it will synchronously drive the large pulley 30 to rotate. The large pulley 30 will drive the small pulley 29 on the connecting shaft 26 to rotate via the belt. The small pulley 29 will drive the arc-shaped blade 28 on the mounting rod 27 to rotate via the connecting shaft 26. The arc-shaped blade 28 effectively prevents excessive impurities from accumulating in a certain place on the filter screen 12, ensuring the filtration effect of the filter screen 12.

[0044] A bearing 31 is fixedly installed on the lower end face of the piston plate 25. A rotating rod 32 is fixedly installed on the bearing 31. A spiral pattern 33 is formed on the side end face of the rotating rod 32. A flow divider 34 is fixedly installed on the side end face of the rotating rod 32 and below the spiral pattern 33. An auxiliary plate 35 is fixedly installed on the inner side of the guide ring 13. A spiral hole 36 is formed on the auxiliary plate 35. The end of the rotating rod 32 away from the bearing 31 extends into the interior of the fine filter chamber 10. The rotating rod 32 is movably installed through the spiral pattern 33 and the spiral hole 36. The auxiliary plate 35 can be set as an isosceles trapezoid according to the needs of the personnel to avoid too much mixed xylene falling on the auxiliary plate 35.

[0045] In this embodiment, as the piston plate 25 descends, it will simultaneously drive the rotating rod 32 to descend. The rotating rod 32 will engage with the spiral hole 36 on the auxiliary plate 35 through the spiral pattern 33 and the bearing 31, thus moving in a downward rotational motion. The flow-diverting blades 34 on the rotating rod 32 and the fine filter membrane 14 rotate in opposite directions, thereby improving the filtration effect of the xylene mixed in the fine filter membrane 14.

[0046] A method for refining mixed xylenes by removing olefins, based on the mixed xylenes refining apparatus described above, includes the following steps:

[0047] S1. The mixed xylene is placed inside the catalytic tank 4. The olefins in the mixed xylene are converted into saturated hydrocarbons through hydrogenation reaction to remove the olefin components. Then, the mixed xylene is placed inside the filter tank 7 through the diversion pipe 5. The mixed xylene in the filter tank 7 will pass through the coarse filter chamber 8, the medium filter chamber 9 and the fine filter chamber 10 in sequence. The coarse filtration is completed by the activated carbon mesh frame 11 in the coarse filter chamber 8, the medium filtration is completed by the filter screen 12 in the medium filter chamber 9, and finally the fine filtration is completed by the fine filter frame membrane 14 in the fine filter chamber 10.

[0048] S2. Simultaneously, while filtering the mixed xylene, the motor 16 drives the rotating shaft 17 to rotate, which in turn drives the fine filter membrane 14 to rotate. Centrifugal force is used to effectively discharge the mixed xylene in the fine filter membrane 14. At the same time, when the rotating shaft 17 rotates, it drives the small gear 18 to rotate. With the cooperation of the small gear 18 and the large gear 20, the large gear 20 drives the thread 21 on the auxiliary rotating shaft 19 to rotate. Through the cooperation of the adjusting nut 22 and the thread 21, the lower pressure plate 23 on the adjusting nut 22 drives the piston plate 25 on the lower pressure rod 24 to press down in the coarse filter chamber 8. By pressing down, the mixed xylene in the filter tank 7 can pass more smoothly through the activated carbon mesh frame 11, the filter screen 12 and the fine filter membrane 14 during the filtration process, ensuring maximum filtration efficiency.

[0049] S3. When the auxiliary rotating shaft 19 rotates, it will synchronously drive the large pulley 30 to rotate. The large pulley 30 will drive the small pulley 29 on the connecting shaft 26 to rotate through the belt. The small pulley 29 will drive the arc-shaped blade 28 on the mounting rod 27 to rotate through the connecting shaft 26. The arc-shaped blade 28 effectively prevents excessive impurities from accumulating in a certain place on the filter screen 12, ensuring the filtration effect of the filter screen 12.

[0050] S4. As the piston plate 25 descends, it will simultaneously drive the rotating rod 32 to descend. The rotating rod 32 will engage with the spiral hole 36 on the auxiliary plate 35 through the spiral pattern 33 and the bearing 31, thus moving in a downward rotational motion. Through the opposite rotation of the diversion blade 34 on the rotating rod 32 and the fine filter membrane 14, the filtration effect of the mixed xylene in the fine filter membrane 14 is improved.

[0051] In this technical solution, the motor 16 will be turned on when all the mixed xylene in the catalyst tank 4 enters the coarse mixing chamber, thereby driving the entire auxiliary component to move. The activated carbon mesh frame 11 is a frame for placing activated carbon. Since this technology is well known to those skilled in the art, it will not be described in detail here.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A mixed xylene deolefining refining device comprising a support plate (1), characterized in that: The inner side of the support plate (1) is fixedly provided with an upper fixed plate (2) and a lower fixed plate (3), the upper fixed plate (2) is fixedly provided with a catalytic tank (4), the bottom end of the catalytic tank (4) is fixedly communicated with a shunt pipe (5), the shunt pipe (5) is fixedly provided with a valve (6), the lower fixed plate (3) is fixedly provided with a filter tank (7), and the end of the shunt pipe (5) away from the catalytic tank (4) is communicated with the filter tank (7); The inside of the filter tank (7) is provided with a coarse filter cavity (8), a medium filter cavity (9) and a fine filter cavity (10), the inside of the coarse filter cavity (8) is fixedly provided with an activated carbon grid (11), the inside of the medium filter cavity (9) is fixedly provided with a filter screen (12), and the inside of the fine filter cavity (10) is fixedly provided with a flow guide ring (13), the inner side of the flow guide ring (13) is rotatably provided with a fine filter frame membrane (14). The filter tank (7) is provided with an auxiliary assembly, which improves the filtering effect of xylene in the filter tank (7), the auxiliary assembly comprises a U-shaped bracket plate (15) fixedly installed at the bottom of the filter tank (7), the U-shaped bracket plate (15) is fixedly provided with a motor (16), the output end of the motor (16) is fixedly provided with a rotating shaft (17), the rotating shaft (17) is fixedly provided with a small gear (18), the inner bottom of the support plate (1) is rotatably provided with an auxiliary rotating shaft (19), the auxiliary rotating shaft (19) is fixedly provided with a large gear (20), the inner side of the auxiliary rotating shaft (19) is provided with a thread (21), the auxiliary rotating shaft (19) is movably provided with an adjusting nut (22) through the thread (21), the adjusting nut (22) is fixedly provided with a pressing plate (23), the pressing plate (23) is fixedly provided with a pressing rod (24), and the bottom end of the pressing rod (24) is fixedly provided with a piston plate (25).

2. The mixed xylene deolefining finishing device according to claim 1, characterized in that: The end of the rotating shaft (17) away from the motor (16) extends to the inside of the fine filter cavity (10) and is fixedly installed with the inner bottom of the fine filter frame membrane (14), the small gear (18) is engaged with the large gear (20), the end of the pressing rod (24) away from the pressing plate (23) extends to the inside of the coarse filter cavity (8), and the piston plate (25) is slidably installed with the inner side of the coarse filter cavity (8).

3. The mixed xylene deolefining finishing device according to claim 1, characterized in that: The lower end surface of the activated carbon grid (11) is rotatably provided with a connecting shaft (26), the bottom end of the connecting shaft (26) is fixedly provided with a mounting rod (27), the mounting rod (27) is fixedly provided with an arc-shaped blade (28), the side end surface of the connecting shaft (26) is fixedly provided with a small belt pulley (29), and the auxiliary rotating shaft (19) is fixedly provided with a large belt pulley (30).

4. The mixed xylene deolefining finishing apparatus according to claim 3, characterized by: The arc-shaped blade (28) is slidably attached to the surface of the filter screen (12), the small belt pulley (29) and the large belt pulley (30) are in the same horizontal plane and are driven by a belt.

5. The mixed xylene deolefining finishing apparatus according to claim 3, characterized by: The lower end surface of the piston plate (25) is fixedly provided with a bearing (31), the bearing (31) is fixedly provided with a rotating rod (32), the side end surface of the rotating rod (32) is provided with a spiral thread (33), the side end surface of the rotating rod (32) and below the spiral thread (33) is fixedly provided with a shunt blade (34), the inner side surface of the guide ring (13) is fixedly provided with an auxiliary plate (35), and the auxiliary plate (35) is provided with a spiral hole (36).

6. A mixed xylene deolefining refining apparatus according to claim 5, characterized in that: The end of the rotating rod (32) away from the bearing (31) extends to the inside of the fine filtering cavity (10), and the rotating rod (32) is movably installed through the spiral thread (33) and the spiral hole (36).

7. A process for the deolefination of a mixed xylene based on a device for the deolefination of a mixed xylene according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: S1, the mixed xylene is put into the inside of the catalytic tank (4), the olefin in the mixed xylene is converted into saturated hydrocarbon by hydrogenation reaction, the olefin component is removed, then the mixed xylene is put into the inside of the filtering tank (7) by the shunt pipe (5), the mixed xylene in the filtering tank (7) will pass through the coarse filtering cavity (8), the medium filtering cavity (9) and the fine filtering cavity (10) in sequence, the coarse filtering is completed by the activated carbon net rack (11) in the coarse filtering cavity (8), the medium filtering is completed by the filter screen (12) in the medium filtering cavity (9), and finally the fine filtering is completed by the fine filtering frame membrane (14) in the fine filtering cavity (10); S2, while filtering the mixed xylene, the rotating shaft (17) is driven to rotate by the motor (16), the fine filtering frame membrane (14) is driven to rotate by the rotating shaft (17), the mixed xylene in the fine filtering frame membrane (14) is effectively discharged by the centrifugal force, when the rotating shaft (17) rotates, the pinion (18) is driven to rotate, the pinion (18) is matched with the gear (20), the gear (20) drives the threads (21) on the auxiliary rotating shaft (19) to rotate, the lower pressing plate (23) on the adjusting nut (22) drives the piston plate (25) on the lower pressing rod (24) to press downward in the coarse filtering cavity (8) by matching the adjusting nut (22) with the threads (21), the mixed xylene in the filtering tank (7) can pass through the activated carbon net rack (11), the filter screen (12) and the fine filtering frame membrane (14) more smoothly in the filtering process by the pressing mode, and the filtering efficiency is maximized; S3, when the auxiliary rotating shaft (19) rotates, the large belt pulley (30) is driven to rotate, the large belt pulley (30) drives the small belt pulley (29) on the connecting shaft (26) to rotate through the belt, the small belt pulley (29) drives the arc-shaped blade (28) on the mounting rod (27) to rotate through the connecting shaft (26), the arc-shaped blade (28) effectively avoids that too many impurities are accumulated at a certain position of the filter screen (12), and the filtering effect of the filter screen (12) is ensured. S4, when the piston plate (25) in the process of descending will drive the rotating rod (32) to descend, the rotating rod (32) will be through the screw thread (33) and the screw hole (36) on the auxiliary plate (35) cooperation, and the bearing (31) acts, thereby in the movement of descending rotation, through the rotating rod (32) on the flow dividing vane (34) and the opposite rotation of the fine filter frame film (14), improve the filtering effect of the mixed xylene in the fine filter frame film (14).

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