A refining purification device for mixed xylene

Abstract

The application provides a mixed xylene refining and purifying device and relates to the technical field of xylene purification. The mixed xylene refining and purifying device comprises a heating box, a plurality of heat exchange pipes arranged in the heating box, a heating device for heating the heat exchange pipes, and a blocking device arranged at the lower end of the heat exchange pipes and comprising a piston and a driving assembly. The application cooperates with the heating device to accurately control the temperature of the mixed xylene. When the temperature in the heat exchange pipe does not reach a preset value, the L-shaped plate drives the piston to move upward to block the lower end of the heat exchange pipe, thereby prolonging the residence time of the mixed xylene in the heat exchange pipe. When the temperature in the heat exchange pipe reaches the preset value, the L-shaped plate drives the piston to move downward to open the heat exchange pipe, thereby ensuring that the components of the mixed xylene can be separated according to the expectation in the subsequent evaporation and separation process and improving the refining and purifying effect.

Description

A purification apparatus for mixed xylenes Technical Field

[0001] This invention relates to the field of xylene purification technology, and more specifically, to a purification apparatus for mixed xylenes. Background Technology

[0002] In modern chemical industries, mixed xylenes are widely used as important organic chemical raw materials in coatings, resins, pesticides, and pharmaceuticals. Among them, para-xylene is a key raw material for the production of polyester fibers and polyester plastics, o-xylene can be used to prepare phthalic anhydride, and m-xylene is often used to produce isophthalic acid, etc. These downstream industries place extremely high demands on the purity and quality of mixed xylenes.

[0003] Existing mixed xylene refining and purification equipment requires filtering the mixed xylene before purification. Traditional filtration methods mostly use static filtration equipment, which suffers from low filtration efficiency, frequent manual cleaning due to impurities clogging the filter screen, affecting production continuity, increasing labor costs, and making it difficult to accurately control the material temperature at different stages. For example, during the heat exchanger preheating stage, the residence time cannot be dynamically adjusted according to the actual material temperature, resulting in large temperature fluctuations of the material entering the heating chamber, affecting subsequent evaporation efficiency and product purity. In addition, the directly discharged water after evaporation wastes heat energy, and the water vapor contains a small amount of xylene gas, which, if directly emitted, could affect the health of workers and does not meet environmental protection requirements. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a purification apparatus for mixed xylenes.

[0005] This invention provides a refining and purification apparatus for mixed xylene, comprising: a heating chamber having a plurality of heat exchange tubes disposed inside; a heating device for heating the heat exchange tubes; and a sealing device disposed at the lower end of the heat exchange tubes, the sealing device comprising a piston and a driving assembly, the piston being slidably connected to a position near the lower end of the heat exchange tube. When the temperature inside the heat exchange tube does not reach a preset value, the piston seals the lower end of the heat exchange tube; when the temperature inside the heat exchange tube reaches the preset value, the driving assembly drives the piston to move out of the lower end of the heat exchange tube, allowing the mixed xylene to enter the heating chamber from the lower end of the heat exchange tube.

[0006] Optionally, the heating device includes two sets of horizontal pipes arranged perpendicular to the heat exchange tubes, and a sleeve is fixedly connected between the two sets of horizontal pipes, with the sleeve fitted onto the heat exchange tubes, and the horizontal pipes and the sleeves being connected.

[0007] Optionally, the heating device further includes an oil inlet pipe and an oil outlet pipe respectively fixedly connected to one end of the two sets of horizontal pipes. The oil inlet pipe and the oil outlet pipe are respectively connected to the thermal oil boiler. A temperature sensor is installed on the oil outlet pipe to monitor the temperature of the thermal oil in the oil outlet pipe.

[0008] Optionally, the drive assembly includes a support plate fixedly connected inside the heating chamber, and a plurality of movable rods are slidably connected to the support plate, with the upper ends of the plurality of movable rods fixedly connected to the piston.

[0009] Optionally, a plurality of connecting plates are fixedly connected to the lower side of the support plate, and cylindrical rods are rotatably connected to the plurality of connecting plates. An L-shaped plate is fixedly connected to the cylindrical rod, and sliding grooves are provided at both ends of the L-shaped plate.

[0010] Optionally, a push rod is slidably connected inside the heating box. One end of the push rod passes through one side of the heating box and is fixedly connected to a cylinder. The cylinder is electrically connected to a temperature sensor. A fixing block is fixedly connected to the outside of the push rod and the lower end of the slide groove. The fixing block slides within the slide groove.

[0011] Optionally, both ends of the cylindrical rod are fixedly connected to stirring blades, which stir the xylene being heated and evaporated in the heating chamber.

[0012] Optionally, a recovery tank is provided inside the heating box near the top. The recovery tank is connected to the heating box via an air inlet pipe. A condenser pipe is provided inside the recovery tank. A water pump is fixedly connected to the upper side of the heating box. The water inlet pipe of the water pump extends into the recovery tank, and the water outlet pipe of the water pump extends into the filter box and is positioned above the filter plate. A liquid inlet pipe is provided on the upper side of the filter box, and the liquid inlet pipe is located above another filter plate.

[0013] Optionally, a filter box is fixedly connected to the upper side of the heating box, and the lower side of the filter box is connected to the upper side of the heating box. A filter assembly is provided inside the filter box. The filter assembly includes a top plate fixedly connected inside the filter box, and two feed holes are opened on the top plate. A side plate is fixedly connected inside the filter box, and two filter plates are slidably connected to one side of the side plate. The two filter plates are horizontally staggered from each other, and the filter plates are positioned above the feed holes.

[0014] Optionally, two interlocking racks are slidably connected to one side of the side plate, a gear is rotatably connected to one side of the side plate, a motor is fixedly connected to one side of the filter box, the output end of the motor passes through one side of the filter box and is fixedly connected to a gear, and the gear meshes with the two racks.

[0015] The beneficial effects of the extrusion solid-liquid separator of this invention are as follows: Mixed xylene is filtered through a filter plate, and the filtered mixed xylene enters multiple heat exchange tubes. Combined with a heating device, the temperature of the mixed xylene is precisely controlled between 90 and 110 degrees Celsius. When the temperature inside the heat exchange tube does not reach the preset value, an L-shaped plate drives a piston upward, sealing the lower end of the heat exchange tube and extending the residence time of the mixed xylene inside the heat exchange tube to ensure heating effect. When the temperature inside the heat exchange tube reaches the preset value, the L-shaped plate drives the piston downward, opening the heat exchange tube and allowing the contents of the heat exchange tube to flow freely. The mixed xylene enters the heating chamber for heating and evaporation, ensuring that the components of the mixed xylene proceed as expected during subsequent evaporation and separation, thus improving the refining and purification effect. At the same time, the rotation of the L-shaped plate drives the stirring blades to oscillate, so that the xylene is heated and evaporated while being stirred. The temperature for heating and evaporating the mixed xylene is controlled between 110 and 125 degrees Celsius, causing the water in the mixed xylene to evaporate into water vapor. The water vapor is then condensed into liquid water, which cleans the filter plate, enabling the liquid water to be recycled and reducing water consumption and production costs. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the overall structure of the purification apparatus for mixed xylene according to an embodiment of the present invention;

[0017] Figure 2 is a first cross-sectional schematic diagram of the heating box and the filter box in the refining and purification apparatus for mixed xylene according to an embodiment of the present invention.

[0018] Figure 3 is a second cross-sectional schematic diagram of the heating box and the filter box in the refining and purification apparatus for mixed xylene according to an embodiment of the present invention.

[0019] Figure 4 is a cross-sectional schematic diagram of the recovery tank in the purification apparatus for mixed xylene according to an embodiment of the present invention;

[0020] Figure 5 is a schematic diagram of the structure of the filter assembly in the purification apparatus for mixed xylene according to an embodiment of the present invention;

[0021] Figure 6 is a schematic diagram of the heating device and the sealing device in the refining and purification apparatus for mixed xylene according to an embodiment of the present invention.

[0022] Figure 7 is a cross-sectional schematic diagram of the heating device in the refining and purification apparatus for mixed xylene according to an embodiment of the present invention.

[0023] Figure 8 is a schematic diagram of the driving component in the heating device of the purification apparatus for mixed xylene according to an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached drawings: 1. Heating box; 12. Filter box; 1201. Top plate; 1202. Feed hole; 1203. Side plate; 1204. Gear; 1205. Motor; 1206. Rack; 1207. Filter plate; 2. Heat exchange tube; 3. Heating device; 31. Horizontal tube; 3101. Oil inlet pipe; 32. Sleeve; 3201. Oil outlet pipe; 33. Temperature sensor; 4. Sealing device; 41. Piston; 4101. Support plate; 4102. Moving rod; 4103. Connecting plate; 4104. Cylindrical rod; 42. L-shaped plate; 4201. Slide groove; 43. Push rod; 44. Cylinder; 45. Stirring blade; 5. Recovery box. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] In the description of this specification, the references to terms such as "embodiment," "one embodiment," "some implementations," "exemplary," and "one implementation," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0028] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0029] As shown in Figures 1-8, this embodiment of the invention provides a refining and purification apparatus for mixed xylene, comprising: a heating chamber 1, wherein a plurality of heat exchange tubes 2 are disposed inside the heating chamber 1; a heating device 3, wherein the heating device 3 is used to heat the heat exchange tubes 2; and a sealing device 4, wherein the sealing device 4 is disposed at the lower end of the heat exchange tubes 2, and the sealing device 4 includes a piston 41 and a driving assembly. The piston 41 is slidably connected to a position near the lower end of the heat exchange tubes 2. When the temperature inside the heat exchange tubes 2 does not reach a preset value, the piston 41 seals the lower port of the heat exchange tubes 2. When the temperature inside the heat exchange tubes 2 reaches the preset value, the driving assembly drives the piston 41 to move out of the lower port of the heat exchange tubes 2, so that the mixed xylene enters the heating chamber 1 from the lower port of the heat exchange tubes 2.

[0030] In this embodiment, several heat exchange tubes 2 are used to allow the mixed xylene to flow from the heat exchange tubes 2 into the heating chamber 1. The heating chamber 1 is equipped with a heater to heat and evaporate the mixed xylene within it. While in the heat exchange tubes 2, the mixed xylene is heated by the heating device 3, maintaining its temperature within the normal operating range. The preset range is set between 90 and 110 degrees Celsius. When the temperature inside the heat exchange tubes 2 does not reach the preset value, the drive assembly moves the piston 41 upwards within the heat exchange tubes 2, sealing the lower end of the heat exchange tubes 2 to prevent the mixed xylene from flowing into the heating chamber 1, thus prolonging the mixing process. The residence time of xylene inside heat exchange tube 2 allows heating device 3 to continue heating the mixed xylene inside heat exchange tube 2, keeping the mixed xylene inside heat exchange tube 2 between 90 and 110 degrees Celsius. When the temperature inside heat exchange tube 2 reaches the preset value, the drive component moves piston 41 downward, causing piston 41 to move out of the lower end of heat exchange tube 2 without sealing heat exchange tube 2. The mixed xylene inside heat exchange tube 2 enters heating chamber 1 for heating and evaporation. Through precise temperature control, the problem of unstable product quality caused by temperature fluctuations is effectively avoided, ensuring that the components of mixed xylene can proceed as expected in the subsequent evaporation and separation process, thus improving the refining and purification effect.

[0031] As shown in Figures 6 and 7, optionally, the heating device 3 includes two sets of horizontal pipes 31 arranged perpendicularly to the heat exchange tube 2, and a sleeve 32 is fixedly connected between the two sets of horizontal pipes 31. The sleeve 32 is sleeved on the heat exchange tube 2, and the horizontal pipes 31 and the sleeve 32 are connected.

[0032] In this embodiment, several sleeves 32 are connected to the horizontal pipe 31, allowing the heat transfer oil to flow between the horizontal pipe 31 and the sleeves 32, increasing the contact area with the heat exchange tube 2. The sleeves 32 are fitted onto several heat exchange tubes 2, which fully transfers the heat of the heat transfer oil to the mixed xylene in the heat exchange tube 2, thereby improving the heating efficiency.

[0033] As shown in Figures 6 and 7, optionally, the heating device 3 also includes an oil inlet pipe 3101 and an oil outlet pipe 3201, which are respectively fixedly connected to one end of the two sets of horizontal pipes 31. The oil inlet pipe 3101 and the oil outlet pipe 3201 are respectively connected to the thermal oil boiler. A temperature sensor 33 is provided on the oil outlet pipe 3201. The temperature sensor 33 is used to monitor the temperature of the thermal oil in the oil outlet pipe 3201.

[0034] In this embodiment, the oil inlet pipe 3101 is connected to the thermal oil boiler, which can continuously supply high-temperature thermal oil to the heating device 3, ensuring a stable heat source during the heating process and maintaining continuous operation of the device. The oil outlet pipe 3201 sends the thermal oil after heat exchange back to the thermal oil boiler, completing the thermal oil circulation, enabling the heating system to work continuously and stably, improving energy utilization. The temperature monitored by the temperature sensor 33 can provide timely feedback and adjust parameters such as the heating power of the thermal oil boiler, ensuring that the heat exchange tube 2 obtains stable and compliant heat, and accurately controlling the heating temperature of the mixed xylene.

[0035] As shown in Figure 7, optionally, the drive assembly includes a support plate 4101 fixedly connected inside the heating box 1, and a plurality of movable rods 4102 are slidably connected on the support plate 4101, with the upper ends of the plurality of movable rods 4102 fixedly connected to the piston 41.

[0036] In this embodiment, the support plate 4101 is slidably connected to the moving rod 4102, which can accurately position and guide the moving rod 4102, so that the moving rod 4102 can only move up and down in the set direction, ensuring that the movement trajectory of the piston 41 is accurate, and stably realizing the blocking and opening action of the lower end of the heat exchange tube 2, and accurately controlling the blocking state of the piston 41 on the heat exchange tube 2.

[0037] As shown in Figure 8, optionally, a number of connecting plates 4103 are fixedly connected to the lower side of the support plate 4101, and a cylindrical rod 4104 is rotatably connected to the connecting plates 4103. An L-shaped plate 42 is fixedly connected to the cylindrical rod 4104, and a sliding groove 4201 is provided at both ends of the L-shaped plate 42.

[0038] In this embodiment, the cylindrical rod 4104 is rotatably connected to the connecting plate 4103, providing a fulcrum for the L-shaped plate 42. The L-shaped plate 42 is fixed on the cylindrical rod 4104. By changing the direction and point of application of the force through its own structure, and in conjunction with the sliding groove 4201, the L-shaped plate 42 can flexibly adjust its angle within a certain range to adapt to different operating states, thereby realizing the movement of the piston 41.

[0039] As shown in Figure 7, optionally, a push rod 43 is slidably connected inside the heating box 1. One end of the push rod 43 passes through one side of the heating box 1 and is fixedly connected to a cylinder 44. The cylinder 44 is electrically connected to the temperature sensor 33. A fixing block is fixedly connected to the outside of the push rod 43 and the lower end of the slide groove 4201. The fixing block slides in the slide groove 4201.

[0040] In this embodiment, the cylinder 44 is electrically connected to the temperature sensor 33, which can precisely control the movement of the push rod 43 based on the temperature of the heat transfer oil in the oil outlet pipe 3201 monitored by the temperature sensor 33. When the temperature reaches the preset value, the cylinder 44 pushes the push rod 43 to move, and then drives the L-shaped plate 42 to rotate through the cooperation of the fixed block and the slide groove 4201, so that the piston 41 moves downward and opens the heat exchange tube 2. When the temperature does not reach the preset value, the cylinder 44 drives the push rod 43 to move in the opposite direction, so that the piston 41 moves upward and blocks the heat exchange tube 2, thereby achieving precise control of the heating and evaporation process of the mixed xylene entering the heating box 1.

[0041] As shown in Figures 6 and 7, optionally, both ends of the cylindrical rod 4104 are fixedly connected with stirring blades 45, which stir the xylene being heated and evaporated in the heating box 1.

[0042] In this embodiment, the heated mixed xylene flows into the heating chamber 1 for heating and evaporation. The heating temperature is controlled between 110 and 125 degrees Celsius. As the cylindrical rod 4104 rotates, it drives the stirring blade 45 to swing. The rotation of the stirring blade 45 allows the xylene in the heating chamber 1 to come into more full contact with the heater, so that the xylene is heated and evaporated while being stirred. The heat can be transferred to the xylene more evenly, improving the overall heat transfer efficiency and helping the mixed xylene to evaporate more quickly and stably.

[0043] As shown in Figures 3 and 4, optionally, a recovery tank 5 is provided inside the heating box 1 near the top. The recovery tank 5 is connected to the heating box 1 through an air inlet pipe. A condenser pipe is provided inside the recovery tank 5. A water pump is fixedly connected to the upper side of the heating box 1. The water inlet pipe of the water pump extends into the recovery tank 5, and the water outlet pipe of the water pump extends into the filter box 12 and is located above the filter plate 1207. A liquid inlet pipe is provided on the upper side of the filter box 12, and the liquid inlet pipe is located above another filter plate 1207.

[0044] In this embodiment, since the boiling points of para-xylene (138°C), o-xylene (144°C), m-xylene (139°C), and ethylbenzene (136°C) in the mixed xylenes are 110°C to 125°C, only water is heated and turns into gas while the mixed xylenes do not, thus achieving separation of water and mixed xylenes. The water vapor after heating and evaporation can enter the recovery tank 5 through the top air inlet pipe, and be condensed into liquid water through the condenser pipe. One end of the water pump is the water inlet pipe, and the other end is the water outlet pipe. A nozzle is provided at one end of the water outlet pipe, which is located directly above the filter plate 1207. By starting the water pump, the liquid water in the recovery tank 5 is transported to the filter plate 1207 inside the filter tank 12 to clean the filter plate 1207, realizing the recycling of water resources, improving the utilization rate of water resources, reducing production costs, and also reducing environmental pollution.

[0045] As shown in Figures 2 and 3, optionally, a filter box 12 is fixedly connected to the upper side of the heating box 1, and the lower side of the filter box 12 is connected to the upper side of the heating box 1. A filter assembly is provided inside the filter box 12. The filter assembly includes a top plate 1201 fixedly connected inside the filter box 12. Two feed holes 1202 are opened on the top plate 1201. A side plate 1203 is fixedly connected inside the filter box 12. Two filter plates 1207 are slidably connected to one side of the side plate 1203, and the two filter plates 1207 are horizontally staggered from each other. The filter plates 1207 are located above the feed holes 1202.

[0046] In this embodiment, considering that there are impurities in the mixed xylene before purification, two filter plates 1207 are provided to facilitate the staggered filtration of the mixed xylene. The mixed xylene enters from the inlet pipe, passes through the filter plate 1207 below the inlet pipe, and the filtered mixed xylene enters the heat exchange tube 2 through the feed hole 1202.

[0047] As shown in Figure 5, optionally, two interleaved racks 1206 are slidably connected to one side of the side plate 1203, a gear 1204 is rotatably connected to one side of the side plate 1203, and a motor 1205 is fixedly connected to one side of the filter box 12. The output end of the motor 1205 passes through one side of the filter box 12 and is fixedly connected to the gear 1204, and the gear 1204 meshes with the two racks 1206.

[0048] In this embodiment, when the filter plate 1207 filters the mixed xylene, impurities accumulate on it after long-term use. The motor 1205 is started, driving the gear 1204 to rotate. The gear 1204 drives two racks 1206 to move relative to each other, causing the two filter plates 1207 to move synchronously. This moves the filter plate 1207 with impurities to below the nozzle, where liquid water washes it. Meanwhile, the clean filter plate 1207 moves to below the inlet pipe to filter the mixed xylene again. Timely cleaning of the clogged filter plate 1207 restores its filtration performance. Each time the filter plate 1207 is used, it is in a good filtration state, effectively intercepting impurities in the mixed xylene and improving the purity and quality of the final product.

[0049] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A purification apparatus for mixed xylenes, characterized in that, include: A heating chamber (1) is provided with several heat exchange tubes (2) inside the heating chamber (1); a heating device (3) is used to heat the heat exchange tubes (2); a sealing device (4) is provided at the lower end of the heat exchange tubes (2), the sealing device (4) includes a piston (41) and a driving assembly, the piston (41) is slidably connected to the heat exchange tube (2) near the lower end, when the temperature inside the heat exchange tube (2) does not reach the preset value, the piston (41) seals the lower port of the heat exchange tube (2), when the temperature inside the heat exchange tube (2) reaches the preset value, the driving assembly drives the piston (41) to move out of the lower port of the heat exchange tube (2) so that the mixed xylene enters the heating chamber (1) from the lower port of the heat exchange tube (2); the driving assembly includes a support plate (4101) fixedly connected inside the heating chamber (1), several moving rods (4102) are slidably connected on the support plate (4101), and several moving rods (4102) are slidably connected on the support plate (4101). The upper end of the moving rod (4102) is fixedly connected to the piston (41); several connecting plates (4103) are fixedly connected to the lower side of the support plate (4101), and cylindrical rods (4104) are rotatably connected to the several connecting plates (4103). An L-shaped plate (42) is fixedly connected to the cylindrical rod (4104), and both ends of the L-shaped plate (42) are provided with sliding grooves (4201); a push rod (43) is slidably connected inside the heating box (1). One end of (43) passes through one side of the heating box (1) and is fixedly connected to a cylinder (44). The cylinder (44) is electrically connected to the temperature sensor (33). The outside of the push rod (43) and the lower end of the moving rod (4102) are both fixedly connected to a fixing block. The fixing block slides in the slide groove (4201). Both ends of the cylindrical rod (4104) are fixedly connected to stirring blades (45). The stirring blades (45) stir the xylene that is heated and evaporated in the heating box (1).

2. The refining and purification apparatus for mixed xylenes as described in claim 1, characterized in that, The heating device (3) includes two sets of horizontal tubes (31) arranged perpendicularly to the heat exchange tube (2). A sleeve (32) is fixedly connected between the two sets of horizontal tubes (31), and the sleeve (32) is sleeved on the heat exchange tube (2). The horizontal tubes (31) and the sleeve (32) are connected.

3. The refining and purification apparatus for mixed xylenes as described in claim 2, characterized in that, The heating device (3) also includes an oil inlet pipe (3101) and an oil outlet pipe (3201) fixedly connected to one end of the two sets of horizontal pipes (31), respectively. The oil inlet pipe (3101) and the oil outlet pipe (3201) are respectively connected to the thermal oil boiler. A temperature sensor (33) is provided on the oil outlet pipe (3201). The temperature sensor (33) is used to monitor the temperature of the thermal oil in the oil outlet pipe (3201).

4. The purification apparatus for mixed xylenes as described in claim 1, characterized in that, A recovery tank (5) is located near the top inside the heating box (1). The recovery tank (5) is connected to the heating box (1) via an air inlet pipe. A condenser pipe is installed inside the recovery tank (5). A water pump is fixedly connected to the upper side of the heating box (1). The water inlet pipe of the water pump extends into the recovery tank (5). The water outlet pipe of the water pump extends into the filter box (12) and is located above the filter plate (1207). An inlet pipe is installed on the upper side of the filter box (12). The inlet pipe is located above another filter plate (1207).

5. The refining and purification apparatus for mixed xylenes as described in claim 4, characterized in that, A filter box (12) is fixedly connected to the upper side of the heating box (1). The lower side of the filter box (12) is connected to the upper side of the heating box (1). A filter assembly is provided inside the filter box (12). The filter assembly includes a top plate (1201) fixedly connected inside the filter box (12). Two feed holes (1202) are opened on the top plate (1201). A side plate (1203) is fixedly connected inside the filter box (12). Two filter plates (1207) are slidably connected to one side of the side plate (1203). The two filter plates (1207) are horizontally offset from each other. The filter plates (1207) are located above the feed holes (1202).

6. The refining and purification apparatus for mixed xylenes as described in claim 5, characterized in that, Two interlocking racks (1206) are slidably connected to one side of the side plate (1203), and a gear (1204) is rotatably connected to one side of the side plate (1203). A motor (1205) is fixedly connected to one side of the filter box (12). The output end of the motor (1205) passes through one side of the filter box (12) and is fixedly connected to the gear (1204), and the gear (1204) meshes with the two racks (1206).

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