High-efficiency energy-saving p-xylene production device

Abstract

The application relates to a high-efficiency energy-saving p-xylene production device and relates to the technical field of chemical equipment. The bottom plate mechanism comprises an inner concave bottom plate which can move up and down in the round tank, the inner concave bottom plate is used for scraping off the crystals adhered to the inner wall of the round tank, most of the reaction liquid can be pressed into the distillation tank, the use time of a liquid pump in the later period is reduced, the energy consumption for discharging liquid is reduced, the crystals on the inner concave bottom plate can be easily scraped off, the crystal cleaning efficiency is improved, meanwhile, the bottom of the inner concave bottom plate is in an inner concave shape, the scraped crystals are gathered at the central part of the inner concave bottom plate through gravity, the crystals can be easily taken out by workers, after the crystals in the tank are scraped off, the scraped crystals are filtered through a filtering mechanism, the scraped crystals are screened according to the size, the crystals in the tank can be taken out, linkage scraping and screening among multiple mechanisms are realized, the collection effect of the device is improved, and the waste of small crystals is avoided.

Description

Technical Field

[0001] This application relates to the field of chemical equipment technology, and in particular to a high-efficiency and energy-saving paraxylene production device. Background Technology

[0002] p-Xylene is an important raw material in the polyester industry. The production of p-xylene produces a mixture of p-xylene, m-xylene, o-xylene, and ethylbenzene. Currently, the main industrial processes for separating p-xylene include adsorption separation and crystallization separation. Because the boiling points of the components in a p-xylene mixture are very similar, but their melting points differ significantly, crystallization is one of the commonly used methods for separating p-xylene.

[0003] Patent CN113877236A discloses an auxiliary device for the production of para-xylene. This prior art adds a soluble salt solution to the inside of the distillation tank through the injection pipe, so that the mixed xylene solution after the reaction can be distilled and then re-enter the crystallization tube for further crystallization and purification. This achieves an increase in the purification rate of para-xylene and an increase in the production of para-xylene with a simple mechanical device.

[0004] However, the aforementioned existing technologies have the following technical defects:

[0005] First, during the crystallization process of paraxylene, crystals will crystallize on the catching filter screen, and some crystals will crystallize inside the filter screen holes. Since the catching filter screen is set inside the crystallization cylinder, it is very troublesome to clean the crystals in each hole afterward, which increases the workload of the staff, consumes time, and reduces the production efficiency of the equipment.

[0006] Second, the crystals will vary in size and volume. Large crystals will be caught by the catching filter, while small crystals will pass through the mesh of the catching filter and will not be caught. Furthermore, these small paraxylene crystals will remain at the bottom of the device and will be difficult to collect.

[0007] In summary, existing technologies still have room for improvement in preventing crystals from adhering to the fishing filter screen and making them difficult to clean, as well as in preventing small crystals from remaining inside the cylinder. Therefore, those skilled in the art have proposed a device that can remove all crystals from the device and improve production efficiency. Summary of the Invention

[0008] To address the aforementioned problems, this application provides a highly efficient and energy-saving paraxylene production apparatus, employing the following technical solution:

[0009] This includes a round can with an open bottom and an openable top cover, and a door is provided on the side of the can near the top.

[0010] The system includes a bottom plate mechanism and a cleaning mechanism. The bottom plate mechanism includes a concave bottom plate that is slidably disposed inside the cylindrical tank. A rectangular cylinder is installed on the inner bottom surface of the concave bottom plate. An upper plate with the same height as the inner bottom surface of the concave bottom plate is installed at the upper end of the rectangular cylinder. A movable cylinder is inserted into the upper plate. The bottom plate mechanism also includes a liquid extraction component.

[0011] The cleaning mechanism includes an electric cylinder 2 that is rotatably installed at the center of the top cover of the round tank. The lower end of the electric cylinder 2 is equipped with a curved scraper that is adapted to the inner wall of the concave bottom plate. The bottom plate mechanism also includes a linkage component.

[0012] It also includes a filtration mechanism, which includes a set of orifice-shaped frames inserted on both sides of the rectangular tube and located below the upper plate, with filter screens installed on the inner walls of the orifice-shaped frames.

[0013] Preferably, the linkage component works with the cleaning mechanism to make the movable cylinder move up and down. The linkage component includes a U-shaped frame installed on the lower side of the upper plate. A set of slide rods are symmetrically installed between the U-shaped frame and the upper plate. A slider connected to the movable cylinder is slidably set on the slide rod. A spring connects the slider to the upper plate.

[0014] Preferably, the side of the movable cylinder has multiple rectangular openings below the upper plate, a magnet is embedded in the center of the upper side of the movable cylinder, the curved scraper is made of iron, and a filter screen is provided in each rectangular opening.

[0015] Preferably, the liquid pumping assembly includes a liquid pump installed on the lower side of the rectangular cylinder, with a telescopic hose connected to the lower end of the movable cylinder at the input end of the liquid pump, and an output pipe installed at the output end of the liquid pump.

[0016] Preferably, a telescopic arm is installed on the lower side of the rectangular cylinder on one side of the telescopic hose, extending into the rectangular cylinder and connected to the U-shaped frame. The filter mechanism also includes a drive assembly for driving the two U-shaped frames to move closer or further apart from each other, with the U-shaped frames located below the upper plate.

[0017] Preferably, a rocking mechanism is provided below the base plate mechanism. The rocking mechanism includes a circular plate that is slidably disposed on the outside of the rectangular tube and connected to two electric cylinders. Multiple telescopic rods that are evenly distributed and whose upper ends are connected to the concave base plate are installed on the upper circumferential side of the circular plate. The rocking mechanism also includes a rocking component for driving the concave base plate to rock up and down.

[0018] Preferably, the cleaning mechanism further includes a motor 1 installed on the upper side of the cylindrical tank and on one side of the electric cylinder 2. A gear 2 is installed on the drive end of the motor 1, and a gear 1 that meshes with the gear 2 is installed on the side of the electric cylinder 2.

[0019] Preferably, a cooling pipe and a connecting pipe are arranged sequentially around the electric cylinder on the upper side of the round tank, and a valve is installed on both the cooling pipe and the connecting pipe near the round tank.

[0020] Preferably, two electric cylinders connected to the shaking mechanism are symmetrically installed on the inner wall of the round tank, multiple evenly distributed support legs are provided on the side of the round tank near the bottom, a controller is provided on the outside of the round tank, and a pressure relief pipe and a pressure gauge are provided on the upper side of the round tank.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. The base plate mechanism of this application includes a concave base plate that can move up and down inside the cylindrical tank. The rising concave base plate can scrape off the crystals adhering to the inner wall of the cylindrical tank, and can also pump most of the reaction liquid into the distillation tank, reducing the time of use of the liquid pump in the later stage and reducing the energy consumption of liquid discharge. In addition, the inner surface of the concave base plate is smooth, and the crystals on it can be easily scraped off by the cleaning mechanism, which improves the crystal cleaning efficiency and avoids the situation where crystals are tightly adhered to the concave base plate and difficult to clean. At the same time, the bottom of the concave base plate is concave, and the scraped crystals will gather in the center of the concave base plate by gravity, making it convenient for the staff to remove them.

[0023] Second, this application also utilizes a base plate mechanism in conjunction with a filtration mechanism to scrape off all the crystals inside the tank, and then uses the filtration mechanism to filter the scraped crystals, thereby sieving the scraped crystals by size. While ensuring that all crystals inside the tank can be removed, multiple mechanisms work together to scrape and sieve, which can not only remove large crystals from the tank, but also easily remove small crystals, improve the collection effect of the device, and avoid the waste of small crystals. This solves the combined problems of difficult crystal cleaning on the fishing filter screen and inability to remove small crystals in the prior art. Attached Figure Description

[0024] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of this application.

[0026] Figure 2 This is a side view of this application.

[0027] Figure 3 This is a schematic diagram of the internal structure of this application.

[0028] Figure 4 This is a schematic diagram of the base plate mechanism of this application.

[0029] Figure 5 This is a schematic diagram of the liquid extraction component structure of this application.

[0030] Figure 6 This is a schematic diagram of the cleanup organization structure in this application.

[0031] Figure 7 This is a schematic diagram of the filter mechanism structure of this application.

[0032] Figure 8 This is a schematic diagram of the working structure of the filtration mechanism in this application.

[0033] Figure 9 This is a schematic diagram of the shaking mechanism structure of this application.

[0034] Figure 10 This is a schematic diagram of the vibration mechanism structure of this application.

[0035] In the diagram: 1. Round tank; 2. Base plate mechanism; 201. Concave base plate; 202. Rectangular cylinder; 203. Top plate; 204. Movable cylinder; 205. Rectangular opening; 206. U-shaped frame; 207. Slide rod; 208. Slider; 209. Spring 1; 210. Magnet; 211. Electric cylinder 1; 212. Liquid pump; 213. Telescopic hose; 215. Output pipe; 3. Cleaning mechanism; 301. Gear 1; 302. Electric cylinder 2; 303. Curved scraper; 304. Motor 1; 305. Gear 2; 4. Filtration mechanism; 40 1. Bidirectional screw; 402. Motor II; 403. Threaded seat; 404. L-shaped plate; 405. Orifice frame; 406. Filter screen II; 5. Shaking mechanism; 501. Circular plate; 502. Telescopic rod; 503. Motor III; 504. Circular disc; 505. Connecting rod; 6. Vibration mechanism; 601. Mounting box; 602. Rectangular plate; 603. Rubber head; 604. Spring II; 605. Cam; 606. Motor IV; 7. Air conditioning pipe; 8. Connecting pipe; 9. Valve; 10. Electric cylinder III; 11. Support leg; 12. Tank door. Detailed Implementation

[0036] The following combination Figure 1 - Figure 10 The embodiments of this application will be described in detail.

[0037] This application discloses a high-efficiency and energy-saving p-xylene production apparatus. The bottom plate mechanism is a concave bottom plate that can move up and down inside a cylindrical tank. The rising concave bottom can scrape off crystals adhering to the inner wall of the cylindrical tank, and most of the reaction pressure can be pumped into the distillation tank, reducing the usage time of the liquid pump in the later stage and reducing the energy consumption of liquid discharge. The inner surface of the concave bottom plate is smooth, and the crystals on it can be easily scraped off by the cleaning mechanism, which improves the crystal cleaning efficiency and avoids the situation where crystals are tightly adhered to the concave bottom plate and difficult to clean. At the same time, the bottom of the concave bottom plate is concave, and the scraped crystals will gather in the center of the concave bottom plate by gravity, making it convenient for the staff to remove them.

[0038] Example 1:

[0039] like Figure 1As shown, the container includes a round tank 1 with an open bottom and an openable top cover. A tank door 12 is provided on the side of the round tank 1 near the top. After crystallization is completed, the tank door 12 is opened to remove the p-xylene crystals from the round tank 1.

[0040] A feed pipe (not shown) is also provided on the upper side of the round tank 1, through which xylene liquid is fed into the round tank 1.

[0041] like Figure 1 As shown, a cold air pipe 7 and a connecting pipe 8 are sequentially arranged on the upper side of the cylindrical tank 1. Valves 9 are installed on both the cold air pipe 7 and the connecting pipe 8 near the cylindrical tank 1. The cold air pipe 7 and the connecting pipe 8 are connected to an external refrigeration tank and a distillation tank respectively (the refrigeration tank and the distillation tank adopt the same model proposed in the prior art). When the valve 9 on the cold air pipe 7 is opened, the dry cold air in the refrigeration tank that has reached the crystallization temperature enters the cylindrical tank 1 through the cold air pipe 7 to allow the xylene solution to react. The connecting pipe 8 can be used to discharge the reaction liquid into the distillation tank and to allow the subsequent para-xylene gas to enter the cylindrical tank 1.

[0042] A filter screen (not shown) is installed at the connection port between the feed pipe, the cooling pipe 7, and the connecting pipe 8 and the round tank 1. The filter screen has small mesh size and filters the crystals when the liquid enters the connecting pipe 8 to prevent the crystals from entering. The xylene solution does not exceed the height of the tank door 12, which also prevents the crystals from crystallizing on the filter screen during the crystallization process.

[0043] like Figure 1 As shown, the side of the cylindrical tank 1 near the bottom has multiple evenly distributed support legs 11. A controller (not shown) is installed on the outside of the cylindrical tank 1. A pressure relief pipe (not shown) and a pressure gauge (not shown) are also installed on the upper side of the cylindrical tank 1. The support legs 11 support the device. The controller is electrically connected to the electrical components inside the device and controls its start and stop. The pressure relief pipe is used to release pressure inside the cylindrical tank 1, and the pressure gauge is used to monitor the internal air pressure of the cylindrical tank 1.

[0044] like Figures 2-4 As shown, the system includes a bottom plate mechanism 2 and a cleaning mechanism 3. The bottom plate mechanism 2 includes a concave bottom plate 201 that is slidably disposed inside the cylindrical tank 1. A rectangular cylinder 202 is installed on the inner bottom surface of the concave bottom plate 201. An upper plate 203 with the same height as the inner bottom surface of the concave bottom plate 201 is installed at the upper end of the rectangular cylinder 202. During the production process, paraxylene crystals crystallize on the upper surfaces of the concave bottom plate 201 and the upper plate 203. At the same time, the concave bottom plate 201 can move up and down inside the cylindrical tank 1. When the concave bottom plate 201 and the upper plate 203 are in the open state of the connecting pipe 8, most of the reaction liquid is forced from the connecting pipe 8 into the distillation tank.

[0045] A rubber ring is also provided between the concave bottom plate 201 and the inner wall of the round tank 1 to seal the gap between them. The rubber ring is made of fluororubber that is resistant to low temperature and corrosion.

[0046] A sealing ring (not shown) is fitted on the outer side of the upper plate 203 to seal the gap between the upper plate 203 and the rectangular tube 202.

[0047] like Figure 4 As shown, a movable cylinder 204 is inserted into the upper plate 203. Multiple rectangular openings 205 are provided on the side of the movable cylinder 204 below the upper plate 203. Each rectangular opening 205 is equipped with a filter screen. When the movable cylinder 204 rises to the top of the upper plate 203, the reaction liquid above the concave bottom plate 201 will enter the rectangular opening 205 through the rectangular opening 205 and be filtered by the filter screen.

[0048] A sealing ring 2 is fitted inside the gap between the upper plate 203 and the movable cylinder 204 to block the gap between the movable cylinder 204 and the upper plate 203. At the same time, the thickness of the upper plate 203 is greater than the width of the rectangular opening 205 to ensure that the reaction liquid will not enter the rectangular cylinder 202 through the rectangular opening 205 during the upward movement of the rectangular opening 205.

[0049] like Figure 4 and Figure 5 As shown, the base plate mechanism 2 also includes a liquid pumping assembly, which includes a liquid pump 212 installed on the lower side of the rectangular cylinder 202. The input end of the liquid pump 212 is equipped with a telescopic hose 213 that communicates with the lower end of the movable cylinder 204. The output end of the liquid pump 212 is equipped with an output pipe 215, which is connected to the input end of the distillation tank. After most of the reaction liquid is pumped into the distillation tank by the rising concave base plate 201, the running liquid pump 212 pumps the reaction liquid in the movable cylinder 204 into the distillation tank until all the small amount of reaction liquid remaining on the concave base plate 201 is pumped out, reducing the working time of the liquid pump 212, thereby achieving energy saving in the process of draining the reaction liquid.

[0050] A quick-connector (not shown) is provided between the output end of the liquid pump 212 and the end of the output pipe 215, which enables quick connection and disconnection between the liquid pump 212 and the output pipe 215.

[0051] like Figure 3 and Figure 6 As shown, the cleaning mechanism 3 includes an electric cylinder 302 rotatably mounted at the center of the top cover of the cylindrical tank 1. The lower end of the electric cylinder 302 extends into the interior of the cylindrical tank 1 and is equipped with a curved scraper 303 adapted to the inner wall of the concave bottom plate 201. The extension of the electric cylinder 302 can drive the curved scraper 303 to descend until it is completely in contact with the inner wall of the concave bottom plate 201. Then, the rotating curved scraper 303 can scrape off the para-xylene crystals crystallized on the concave bottom plate 201 and the upper plate 203. The concave bottom plate 201 is designed to be concave, so that the crystals can be gathered above the upper plate 203 by gravity.

[0052] like Figure 6 As shown, the cleaning mechanism 3 also includes a motor 304 installed on the upper side of the cylindrical tank 1 and on the side of the electric cylinder 302. The drive end of the motor 304 is equipped with a gear 305. The side of the electric cylinder 302 is equipped with a gear 301 that meshes with the gear 305. The running motor 304 drives the gear 305 to rotate, and the gear 301 drives the electric cylinder 302 and the curved scraper 303 to rotate.

[0053] like Figure 4 As shown, the base plate mechanism 2 also includes a linkage component, which works with the cleaning mechanism 3 to make the movable cylinder 204 move up and down.

[0054] like Figure 4 As shown, the linkage component includes a U-shaped frame 206 installed on the lower side of the upper plate 203. A set of slide rods 207 with their upper ends fixedly connected to the upper plate 203 are symmetrically arranged between the U-shaped frame 206 and the upper plate 203. A limiting block (not shown) connected to the inner side of the U-shaped frame 206 is provided at the lower end of the slide rods 207. A slider 208 connected to the movable cylinder 204 is slidably arranged on the slide rods 207. A spring 209 is connected between the slider 208 and the upper plate 203. The rising movable cylinder 204 compresses the spring 209 through the slider 208. When the spring 209 rebounds, it drives the movable cylinder 204 to return to its original position so that the movable cylinder 204 is flush with the upper plate 203 again. At this time, the slider 208 moves to the lower end of the slide rod 207 and is limited by the limiting block.

[0055] like Figure 4 As shown, a magnet 210 is embedded in the center of the upper side of the movable cylinder 204. The curved scraper 303 is made of iron. When the curved scraper 303 descends to contact the magnet 210, the magnet 210 and the curved scraper 303 are magnetically attracted. After the curved scraper 303 scrapes the inner wall of the concave bottom plate 201, the rising curved scraper 303 will drive the movable cylinder 204 to rise through the magnet 210. By controlling the height of the curved scraper 303 to be the height from the inner bottom surface of the rectangular opening 205 to the upper side of the upper plate 203, the rectangular opening 205 can be moved above the upper plate 203 to clean the residual reaction liquid above the concave bottom plate 201.

[0056] The concave base plate 201 is made of stainless steel (using low-carbon molybdenum-containing austenitic stainless steel), which is resistant to low temperatures and xylene corrosion.

[0057] like Figure 3 and Figure 9 As shown, a rocking mechanism 5 is provided below the base plate mechanism 2. Two electric cylinders 10 connected to the rocking mechanism 5 are symmetrically installed on the inner wall of the cylindrical tank 1. The extension and retraction of the electric cylinders 10 drive the base plate mechanism 2 to rise and fall inside the cylindrical tank 1 through the rocking mechanism 5.

[0058] In summary, xylene solution is fed into round tank 1 through the feed pipe, then the feed pipe is closed. The cooling pipe 7 and the connecting pipe 8 are connected to the external refrigeration tank and distillation tank, respectively. The valve 9 on the cooling pipe 7 is opened, and the cooling gas from the refrigeration tank that has reached the crystallization temperature enters round tank 1 through the cooling pipe 7. Then the corresponding valve 9 is closed, allowing the xylene solution to react. Para-xylene crystals crystallize in the solution and on the surface of the concave bottom plate 201. After the reaction time is reached, the pressure relief pipe is opened to depressurize round tank 1 until it reaches atmospheric pressure. Then the valve 9 on the connecting pipe 8 is opened, and the rising concave bottom plate 201 pushes the reaction liquid into the distillation tank through the connecting pipe 8. The filter screen 3 filters the suspended crystals in the reaction liquid to prevent them from entering the distillation tank through the connecting pipe 8. At the same time, the para-xylene crystals on the inner wall of round tank 1 are scraped off. When the electric cylinder 3 10 rises to its highest position, most of the reaction liquid in round tank 1 is discharged.

[0059] Then, the electric cylinder 302 extends, causing the curved scraper 303 to contact the inner wall of the concave bottom plate 201. The rotating curved scraper 303 scrapes off the xylene crystals from the surfaces of the concave bottom plate 201 and the upper plate 203. Then, the curved scraper 303 rises to the length from the bottom surface of the rectangular opening 205 to the upper side of the upper plate 203, thereby driving the movable cylinder 204 to rise until the rectangular opening 205 moves above the upper plate 203. Then, the liquid extraction assembly operates to draw the residual reaction liquid above the concave bottom plate 201 into the distillation tank. First, the crystals filtered out by the third filter will remain in the residual reaction liquid, and then they will be filtered out by the first filter in the rectangular opening 205. After completion, the curved scraper 303 continues to rise. When the magnetic force is less than the rebound force of the spring 209, the curved scraper 303 disconnects from the magnet 210, and the spring 209 rebounds, causing the movable cylinder 204 to return to its original position.

[0060] In the subsequent distillation tank, gaseous para-xylene is fed into the low-temperature circular tank 1 through the connecting pipe 8. The para-xylene will be in a solid-liquid mixed state in the circular tank 1. The valve 9 on the connecting pipe 8 is closed, and the feed pipe is opened. The rising concave bottom plate 201 will push out most of the para-xylene liquid. Then, the cleaning mechanism 3 will scrape off the crystals on the concave bottom plate 201. At the same time, during the rising process, the rectangular opening 205 will move above the upper plate 203. The liquid pump 212 and the output pipe 215 will be separated from the quick connector. The collection tank will be placed at the output end of the liquid pump 212. The running liquid pump 212 will draw out the remaining para-xylene liquid and send it into the collection tank.

[0061] like Figure 4 and Figure 8 As shown, a telescopic arm is installed on the lower side of the rectangular tube 202 on one side of the telescopic hose 213. The telescopic arm extends into the rectangular tube 202 and is connected to the U-shaped frame 206. The telescopic electric cylinder 211 can drive the components on the U-shaped frame 206 to move inside the rectangular tube 202.

[0062] like Figure 7 and Figure 8 As shown, it also includes a filtering mechanism 4, which includes a set of extremely thin orifice frames 405 inserted on both sides of the rectangular cylinder 202 and below the upper plate 203. The inner wall of the orifice frame 405 is fitted with an extremely thin filter screen 406 with the same thickness as the orifice frame 405. When the upper plate 203 descends below the orifice frame 405, the upper surface of the upper plate 203 and the lower surface of the filter screen 406 are at the same height. The two orifice frames 405 drive the two filter screens 406 to slowly enter the rectangular cylinder 202. At this time, the crystals above the upper plate 203 can be moved to the upper surface of the filter screen 406 and screened by the filter screen 406. Large crystal particles remain above the filter screen 406, while small crystal particles pass through the filter screen 406 and fall back onto the upper plate 203.

[0063] The aperture of filter screen 406 is designed based on the common size of paraxylene crystals. Because the orifice frame 405 and filter screen 406 are extremely thin, and the upper surface of the upper plate 203 and the lower surface of filter screen 406 are at the same height when they approach each other, the lower surface of filter screen 406 is always in contact with the upper surface of the upper plate 203 when it enters the rectangular tube 202. At the same time, the upper plate 203 is loose and has a fluid nature. As the two extremely thin filter screens 406 approach each other, they can scoop the crystals above the upper plate 203 to the top of the filter screen 406. The slow entry of filter screen 406 can reduce the pressure on the bottom of the crystal and avoid the crystal from breaking and producing small particles.

[0064] like Figure 7 As shown, the filter mechanism 4 also includes a drive assembly for driving the two orifice frames 405 to move closer to or further away from each other.

[0065] like Figure 7 and Figure 8 As shown, the drive assembly includes a bidirectional screw 401 rotatably mounted on the rear side of the rectangular cylinder 202. A second motor 402 with its drive end connected to one end of the bidirectional screw 401 is also mounted on the rear side of the rectangular cylinder 202. Each thread of the bidirectional screw 401 is provided with a threaded seat 403 that is slidably connected to the side of the rectangular cylinder 202. An L-shaped plate 404 connected to the orifice frame 405 on the same side is mounted on the upper side of the threaded seat 403. The second motor 402 drives the bidirectional screw 401 to rotate, driving the two threaded seats 403 to move closer to each other, and driving the two orifice frames 405 to move closer to each other, and vice versa.

[0066] like Figure 3 and Figure 9 As shown, the rocking mechanism 5 includes a circular plate 501 that is slidably disposed on the outside of the rectangular tube 202 and connected to two electric cylinders 10. Multiple telescopic rods 502 that are evenly distributed and whose upper ends are connected to the concave bottom plate 201 are installed on the upper circumferential side of the circular plate 501. During the up-and-down movement of the concave bottom plate 201 relative to the circular plate 501, the telescopic rods 502 are simultaneously pulled to extend and retract.

[0067] like Figure 9 As shown, the rocking mechanism 5 also includes a rocking component, which is used to drive the concave base plate 201 to rock up and down.

[0068] like Figure 9 As shown, the shaking assembly includes a set of motors 503 symmetrically mounted on the upper side of the circular plate 501. A disc 504 is mounted on the drive end of the motors 503. A connecting rod 505 is hinged to the side edge of the disc 504 and hinged to the lower side of the concave bottom plate 201. The running motors 503 drive the disc 504 to rotate. The rotating disc 504 pulls the concave bottom plate 201 up and down on the circular plate 501 through the connecting rod 505, thereby shaking the crystals on it to ensure filtration efficiency.

[0069] In summary, after the reaction liquid is completely discharged, the controller controls the electric cylinder 211 to shorten its fixed length, so that the upper surface of the upper plate 203 is at the same height as the lower surface of the filter screen 406. Then, the drive assembly drives the two orifice frames 405 to move closer together into the rectangular cylinder 202, thereby transferring the crystals above the upper plate 203 to the upper surface of the filter screen 406. Afterward, the electric cylinder 211 continues to shorten to its shortest length, increasing the distance between the upper plate 203 and the filter screen 406. Then, the shaking mechanism 5 causes the concave bottom plate 201 to move up and down on the circular plate 501, shaking the crystals above the filter screen 406. Large crystals remain on top, while small crystals pass through the filter screen 406 and fall onto the upper plate 202. 03. After screening, open the tank door 12. The staff will insert a stainless steel cup (made of low-carbon molybdenum-containing austenitic stainless steel with an anti-static coating) into the tank through the open door 12 to manually remove all the large crystals above the filter screen 406. After removing the large crystals above the filter screen 406, the drive assembly will move the two filter screens 406 out of the rectangular cylinder 202. The electric cylinder 211 will extend and lift the upper plate 203 until it returns to its original position, while lifting the small crystals on it into the concave bottom plate 201. Then, the staff will insert the stainless steel cup into the tank to manually remove all the small crystals above the concave bottom plate 201.

[0070] Example 2:

[0071] Based on Example 1, such as Figure 6 and Figure 10 As shown, a vibration mechanism 6 is also provided. The vibration mechanism 6 includes a set of mounting boxes 601 disposed inside the round tank 1 and on one side of the curved scraper 303. A rectangular plate 602 is slidably disposed inside the mounting box 601. Rubber heads 603 extending to the outside of the mounting box 601 are installed on the side of the rectangular plate 602 adjacent to the curved scraper 303. The left and right movement of the rectangular plate 602 causes the rubber heads 603 to strike the curved scraper 303 and make it vibrate.

[0072] like Figure 6 and Figure 10 As shown, a spring 604 connects the side of the rectangular plate 602 near the rubber head 603 to the inner wall of the mounting box 601. A cam 605 is rotatably mounted on the other side of the rectangular plate 602. A motor 606 with its drive end connected to its rotating shaft is mounted on the upper side of the round can 1 above each cam 605. The running motor 606 drives the cam 605 to rotate. The rotating cam 605, in conjunction with the spring 604, causes the rectangular plate 602 to reciprocate left and right within the mounting box 601.

[0073] In summary, after the curved scraper 303 finishes scraping the concave base plate 201 and rises to its highest point, the two motors 606 drive the cam 605 to rotate. The rotating cam 605, in conjunction with the spring 604, causes the rectangular plate 602 to reciprocate left and right within the mounting box 601, which in turn causes each rubber head 603 to move left and right, impacting the curved scraper 303 and causing it to vibrate. This vibrates the crystals adhering to the surface of the curved scraper 303 and causes them to fall onto the concave base plate 201.

[0074] This application also discloses a method for using a high-efficiency and energy-saving p-xylene production unit, the steps of which are as follows:

[0075] S1. Material reaction: Xylene solution and cold gas are introduced into the round tank 1 for reaction. Specifically, the cold gas pipe 7 and the connecting pipe 8 are connected to the external refrigeration tank and the distillation tank, respectively. Xylene solution is sent into the round tank 1 through the feed pipe. Then, the feed pipe is closed, and the valve 9 on the cold gas pipe 7 is opened. The cold gas from the refrigeration tank that has reached the crystallization temperature enters the round tank 1 through the cold gas pipe 7. Then, the corresponding valve 9 is closed to allow the xylene solution to react. Xylene crystals crystallize in the solution, on the inner wall of the round tank 1, and on the surface of the concave bottom plate 201. After the reaction time is reached, the pressure relief pipe is opened to depressurize the round tank 1 until it reaches atmospheric pressure.

[0076] S2. Crystal cleaning: The crystals adhering to the concave bottom plate 201 and the inner wall of the round tank 1 are cleaned. Specifically, valve 9 on the connecting pipe 8 is opened, and electric cylinder 3 10 extends to drive the bottom plate mechanism 2 to rise. The rising concave bottom plate 201 pushes the reaction liquid into the distillation tank through the connecting pipe 8, while scraping off the xylene crystals on the inner wall of the round tank 1. When electric cylinder 3 10 rises to its highest point, most of the reaction liquid in the round tank 1 is discharged. Then, electric cylinder 2 302 extends to drive the curved scraper 303 to contact the inner wall of the concave bottom plate 201. The rotating curved scraper 303 scrapes off the xylene crystals on the surface of the concave bottom plate 201 and the upper plate 203.

[0077] S3. Residual liquid discharge: The residual reaction liquid above the concave bottom plate 201 is discharged into the distillation tank. Specifically, the controller makes the curved scraper 303 rise by the length from the inner bottom surface of the rectangular opening 205 to the upper side of the upper plate 203, thereby driving the movable cylinder 204 to rise until the rectangular opening 205 moves above the upper plate 203. Then, the liquid pumping assembly operates to pump the residual reaction liquid above the concave bottom plate 201 into the distillation tank. After completion, the curved scraper 303 continues to rise. When the magnetic force is less than the rebound force of the spring-209 compression, the curved scraper 303 disconnects from the magnet 210, and the spring-209 rebounds to drive the movable cylinder 204 to return to its original position.

[0078] S4. Crystal screening: Specifically, the crystals are screened by size using filter screen 406. After the reaction liquid is completely discharged, the controller controls the electric cylinder 211 to shorten its fixed length so that the upper surface of the upper plate 203 is at the same height as the lower surface of filter screen 406. Then, the drive assembly drives the two orifice frames 405 to move closer to each other into the rectangular cylinder 202, thereby transferring the crystals above the upper plate 203 to the upper surface of filter screen 406. Then, the electric cylinder 211 continues to shorten to its shortest length, increasing the distance between the upper plate 203 and filter screen 406. Then, the shaking mechanism 5 causes the concave bottom plate 201 to move up and down on the circular plate 501, shaking the crystals above filter screen 406. Large crystals remain on top, while small crystals pass through filter screen 406 and fall onto the upper plate 203.

[0079] S5. Crystal Removal: Take out the sieved xylene crystals of different sizes from the round tank 1 in sequence. Specifically, open the tank door 12 and take out the large crystals above the filter screen 406. Then, the drive assembly drives the two filter screens 406 to move out of the rectangular cylinder 202. The electric cylinder 211 extends and drives the upper plate 203 to rise until it returns to its original position. At the same time, it drives the small crystals on it to rise into the concave bottom plate 201. Then, the small crystals can be removed.

[0080] S6. Secondary crystallization: Specifically, the gaseous p-xylene generated in the distillation tank is sent to the low-temperature circular tank 1 through the connecting pipe 8 for secondary crystallization. Specifically, gaseous p-xylene is sent to the low-temperature circular tank 1 through the connecting pipe 8 in the subsequent distillation tank. The p-xylene will be in a solid-liquid mixed state in the circular tank 1. The valve 9 on the connecting pipe 8 is closed, and the feed pipe is opened. The rising concave bottom plate 201 pushes out most of the p-xylene liquid. Then, the cleaning mechanism 3 scrapes off the crystals on the concave bottom plate 201. At the same time, during the rising process, the rectangular opening 205 moves above the upper plate 203, separating the liquid pump 212 from the output pipe 215. The running liquid pump 212 extracts the remaining p-xylene liquid, and the operation is repeated to screen the p-xylene crystals and take them out one by one.

[0081] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered in all respects as exemplary and not restrictive.

[0082] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-efficiency and energy-saving paraxylene production apparatus, comprising a cylindrical tank with an open bottom and an openable top cover, wherein a tank door is provided on the side of the cylindrical tank near the top, characterized in that: The system includes a base plate mechanism and a cleaning mechanism. The base plate mechanism includes a concave base plate that is slidably disposed inside the cylindrical tank. A rectangular cylinder is installed on the inner bottom surface of the concave base plate. An upper plate with the same height as the inner bottom surface of the concave base plate is installed at the upper end of the rectangular cylinder. A movable cylinder is inserted into the upper plate. Multiple rectangular openings are opened on the side of the movable cylinder below the upper plate. A filter screen is installed in each rectangular opening. A magnet is embedded in the center of the upper side of the movable cylinder. The base plate mechanism also includes a liquid extraction component and a linkage component. The linkage component includes a U-shaped frame installed on the lower side of the upper plate. A set of slide rods are symmetrically installed between the U-shaped frame and the upper plate. A slider connected to the movable cylinder is slidably mounted on the slide rod. A spring connects the slider to the upper plate. The liquid pumping assembly includes a liquid pump installed on the lower side of the rectangular cylinder, and the input end of the liquid pump is equipped with a telescopic hose that communicates with the lower end of the movable cylinder. An electric cylinder with a telescopic arm end extending into the rectangular tube and connected to the U-shaped frame is installed on the lower side of the rectangular tube, on the side of the telescopic hose. The cleaning mechanism includes an electric cylinder 2 that is rotatably installed at the center of the top cover of the round tank. The lower end of the electric cylinder 2 is equipped with a curved scraper that is adapted to the inner wall of the concave bottom plate. The curved scraper is made of iron. It also includes a filtration mechanism, which includes a set of orifice frames inserted on both sides of the rectangular tube. The inner wall of the orifice frames is fitted with a filter screen. The filtration mechanism also includes a drive assembly, which is used to drive the two orifice frames to move closer to each other or further away from each other. The orifice frames are located below the upper plate.

2. The high-efficiency and energy-saving paraxylene production apparatus according to claim 1, characterized in that: The linkage components work in conjunction with the cleaning mechanism to make the movable cylinder move up and down.

3. The high-efficiency and energy-saving paraxylene production apparatus according to claim 1, characterized in that: An output pipe is installed at the output end of the liquid pump.

4. The high-efficiency and energy-saving paraxylene production apparatus according to claim 1, characterized in that: A rocking mechanism is provided below the base plate mechanism. The rocking mechanism includes a circular plate that is slidably disposed on the outside of the rectangular tube and connected to two electric cylinders. Multiple telescopic rods that are evenly distributed and whose upper ends are connected to the concave base plate are installed on the upper circumferential side of the circular plate. The rocking mechanism also includes a rocking component, which is used to drive the concave base plate to rock up and down.

5. The high-efficiency and energy-saving paraxylene production apparatus according to claim 1, characterized in that: The cleaning mechanism also includes a motor 1 installed on the upper side of the round tank and on the side of the electric cylinder 2. A gear 2 is installed on the drive end of the motor 1, and a gear 1 that meshes with the gear 2 is installed on the side of the electric cylinder 2.

6. The high-efficiency and energy-saving paraxylene production apparatus according to claim 1, characterized in that: A cooling pipe and a connecting pipe are arranged sequentially around the electric cylinder on the upper side of the round tank. Valves are installed on the cooling pipe and the connecting pipe near the round tank.

7. The high-efficiency and energy-saving paraxylene production apparatus according to claim 4, characterized in that: Two electric cylinders connected to a rocking mechanism are symmetrically installed on the inner wall of the round tank. Several evenly distributed support legs are set on the side of the round tank near the bottom. A controller is set on the outside of the round tank. A pressure relief pipe and a pressure gauge are also set on the upper side of the round tank.

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