Refining and purifying device for mixed xylene

Abstract

The invention provides a refining and purifying device for mixed xylene, and relates to the technical field of xylene purification. The refining and purifying device for the mixed xylene comprises a heating box, wherein a plurality of heat exchange tubes are arranged in the heating box; the heating device is used for heating the heat exchange tube; and the plugging device is arranged at the lower end of the heat exchange tube, and the plugging device comprises a piston and a driving assembly. The temperature of mixed xylene is accurately controlled through cooperation with a heating device, when the temperature in a heat exchange pipe does not reach a preset value, an L-shaped plate drives a piston to move upwards, the lower end of the heat exchange pipe is blocked, the retention time of the mixed xylene in the heat exchange pipe is prolonged, and when the temperature in the heat exchange pipe reaches the preset value, the piston is driven to move upwards to block the lower end of the heat exchange pipe. And the L-shaped plate drives the piston to move downwards to open the heat exchange tube, so that each component of the mixed xylene can be carried out as expected in the subsequent evaporation and separation process, and the refining and purifying effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of xylene purification, in particular to a device for refining and purifying mixed xylene. Background Art

[0002] In the modern chemical industry, mixed xylenes, as important organic chemical raw materials, are widely used in coatings, resins, pesticides, pharmaceuticals, and other fields. Para-xylene is a key raw material for the production of polyester fibers and polyester plastics, while o-xylene can be used to produce phthalic anhydride and meta-xylene is commonly used in the production of isophthalic acid. 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 has problems such as low filtration efficiency and frequent manual cleaning after impurities clog the filter. This not only affects production continuity but also increases labor costs. It is also difficult to accurately control the temperature of the material at different stages. For example, during the preheating stage of the heat exchange tube, the residence time cannot be dynamically adjusted according to the actual temperature of the material, resulting in large temperature fluctuations of the material entering the heating box, affecting the subsequent evaporation efficiency and product purity. In addition, the evaporated water resources are directly discharged, and the direct discharge of water vapor wastes heat energy. A small amount of xylene gas will be mixed with the water vapor. Direct discharge will affect the health of workers and does not meet environmental protection requirements. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a device for refining and purifying mixed xylene.

[0005] The present invention provides a refining and purification device for mixed xylene, comprising: a heating box, wherein a plurality of heat exchange tubes are arranged inside the heating box; a heating device, wherein the heating device is used to heat the heat exchange tubes; a sealing device, wherein the sealing device is arranged at the lower end of the heat exchange tube, and the sealing device comprises a piston and a driving assembly, wherein the piston is slidably connected to a position near the lower end of the heat exchange tube, and 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 a preset value, the driving assembly drives the piston to move out of the lower end of the heat exchange tube, so that the mixed xylene enters the heating box from the lower end of the heat exchange tube.

[0006] Optionally, the heating device includes two groups of transverse tubes arranged perpendicular to the heat exchange tubes, a sleeve is fixedly connected between the two groups of transverse tubes, and the sleeve is sleeved on the heat exchange tubes, and the transverse tubes are communicated with the sleeve.

[0007] Optionally, the heating device further includes an oil inlet pipe and an oil outlet pipe respectively and fixedly connected to one end of two groups of the horizontal pipes. The oil inlet pipe and the oil outlet pipe are respectively communicated with a heat-conducting oil boiler. A temperature sensor is arranged on the oil outlet pipe, and the temperature sensor is used to monitor the temperature of the heat-conducting oil in the oil outlet pipe.

[0008] Optionally, the driving assembly includes a support plate fixedly connected inside the heating box. A plurality of moving rods are slidably connected to the support plate, and the upper ends of the plurality of moving rods are fixedly connected to a piston.

[0009] Optionally, a plurality of connecting plates are fixedly connected to the lower side of the support plate. A cylindrical rod is rotatably connected to the plurality of connecting plates. An L-shaped plate is fixedly connected to the cylindrical rod, and sliding grooves are formed 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 penetrates through one side of the heating box and is fixedly connected to a cylinder. The cylinder is electrically connected to the temperature sensor. Fixed blocks are fixedly connected to the outside of the push rod and the lower end of the sliding groove, and the fixed blocks slide in the sliding groove.

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

[0012] Optionally, a recovery box is arranged at a position near the upper part inside the heating box. The recovery box is communicated with the heating box through an air inlet pipe. A condensing pipe is arranged inside the recovery box. 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 box, and the water outlet pipe of the water pump extends into the filtering box and is arranged above the filtering plate. A liquid inlet pipe is arranged on the upper side of the filtering box, and the liquid inlet pipe is located above another filtering plate.

[0013] Optionally, a filtering box is fixedly connected to the upper side of the heating box. The lower side of the filtering box is communicated with the upper side of the heating box. A filtering component is arranged inside the filtering box. The filtering component includes a top plate fixedly connected inside the filtering box. Two feeding holes are formed in the top plate. A side plate is fixedly connected inside the filtering box. Two filtering plates are slidably connected to one side of the side plate, and the two filtering plates are horizontally staggered. The filtering plates are arranged above the feeding holes.

[0014] Optionally, two mutually staggered 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 filtering box. The output end of the motor penetrates through one side of the filtering box and is fixedly connected to a gear, and the gear is meshed with the two racks.

[0015] The beneficial effects of the extrusion solid-liquid separator of the present invention are as follows: The mixed xylene is filtered by the filter plate, and the filtered mixed xylene enters into a plurality of heat exchange tubes. In cooperation with the heating device, the temperature of the mixed xylene is accurately controlled at 90 to 110 degrees. When the temperature inside the heat exchange tube does not reach the preset value, the L-shaped plate drives the piston to move upward to block the lower end of the heat exchange tube, prolonging the residence time of the mixed xylene inside the heat exchange tube and ensuring the heating effect. When the temperature inside the heat exchange tube reaches the preset value, the L-shaped plate drives the piston to move downward to open the heat exchange tube, enabling the mixed xylene inside the heat exchange tube to enter the heating box for heating and evaporation, ensuring that each component of the mixed xylene can proceed as expected during the subsequent evaporation and separation process, improving the refining and purification effect. At the same time, when the L-shaped plate rotates, it drives the stirring blades to swing, causing the xylene to be stirred while heating and evaporating. The temperature for heating and evaporating the mixed xylene is controlled at 110 to 125 degrees, enabling the water in the mixed xylene to be evaporated into water vapor. The water vapor is condensed into liquid water, and the liquid water is used to clean the filter plate, realizing the recyclable use of liquid water and reducing the consumption of water resources and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the refining and purification device for mixed xylene according to an embodiment of the present invention; Figure 2 is a first cross-sectional view of the heating box and the filter box in the refining and purification device for mixed xylene according to an embodiment of the present invention; Figure 3 is a second cross-sectional view of the heating box and the filter box in the refining and purification device for mixed xylene according to an embodiment of the present invention; Figure 4 is a cross-sectional view of the recovery box in the refining and purification device for mixed xylene according to an embodiment of the present invention; Figure 5 is a schematic diagram of the structure of the filter assembly in the refining and purification device for mixed xylene according to an embodiment of the present invention; Figure 6 is a schematic diagram of the structure of the heating device and the blocking device in the refining and purification device for mixed xylene according to an embodiment of the present invention; Figure 7 is a cross-sectional view of the heating device in the refining and purification device for mixed xylene according to an embodiment of the present invention; Figure 8 is a schematic diagram of the structure of the driving assembly in the heating device of the refining and purification device for mixed xylene according to an embodiment of the present invention.

[0017] Description of the drawing reference numerals: 1. Heating box; 12. Filter box; 1201. Top plate; 1202. Feeding 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. Chute; 43. Push rod; 44. Cylinder; 45. Stirring blade; 5. Recycling box. Detailed implementation manners

[0018] To make the above objects, features and advantages of the present invention more obvious and understandable, the following describes in detail the specific embodiments of the present invention with reference to the drawings.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0020] In the description of this specification, the descriptions referring to terms such as "embodiment", "one embodiment", "some embodiments", "exemplarily" and "one embodiment" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or embodiment are included in at least one embodiment or embodiment of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or embodiments in a suitable manner.

[0021] The terms "first", "second", etc., are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features.

[0022] Such as Figures 1-8As shown in the figure, an embodiment of the present invention provides a refined purification device for mixed xylene, including: a heating box 1, inside which several heat exchange tubes 2 are arranged; a heating device 3 for heating the heat exchange tubes 2; a plugging device 4 arranged at the lower end of the heat exchange tubes 2, the plugging device 4 includes a piston 41 and a driving component, the piston 41 is slidably connected to a position near the lower end of the heat exchange tube 2, when the temperature inside the heat exchange tube 2 does not reach the preset value, the piston 41 plugs the lower port of the heat exchange tube 2, when the temperature inside the heat exchange tube 2 reaches the preset value, the driving component 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 box 1 from the lower port of the heat exchange tube 2.

[0023] In this embodiment, through the several heat exchange tubes 2 arranged, the mixed xylene flows from the heat exchange tubes 2 into the heating box 1. A heater is arranged inside the heating box 1, and the heater is used to heat and evaporate the mixed xylene in the heating box 1. When the mixed xylene is in the heat exchange tubes 2, it is heated by the heating device 3, so that the temperature of the mixed xylene in the heat exchange tubes 2 is controlled within the normal working temperature range, and the preset value is set between 90 degrees and 110 degrees. When the temperature inside the heat exchange tube 2 does not reach the preset value, the driving component drives the piston 41 to move upward in the heat exchange tube 2 to plug the lower end of the heat exchange tube 2, preventing the mixed xylene in the heat exchange tube 2 from flowing into the heating box 1, extending the residence time of the mixed xylene inside the heat exchange tubes 2, so that the heating device 3 continues to heat the mixed xylene in the heat exchange tubes 2, and the mixed xylene in the heat exchange tubes 2 is controlled between 90 degrees and 110 degrees. When the temperature inside the heat exchange tube 2 reaches the preset value, the driving component drives the piston 41 to move downward, so that the piston 41 moves out of the lower end of the heat exchange tube 2 and does not plug the heat exchange tube 2, and the mixed xylene inside the heat exchange tube 2 enters the heating box 1 for heating and evaporation. Through precise temperature control, the problem of unstable product quality caused by temperature fluctuations is effectively avoided, ensuring that each component of the mixed xylene can proceed as expected in the subsequent evaporation and separation process, and improving the refined purification effect.

[0024] As Figure 6 and Figure 7 As shown in the figure, optionally, the heating device 3 includes two horizontal tubes 31 arranged perpendicular to the heat exchange tubes 2. A sleeve 32 is fixedly connected between the two horizontal tubes 31, and the sleeve 32 is sleeved on the heat exchange tubes 2, and the horizontal tubes 31 are communicated with the sleeve 32.

[0025] In this embodiment, the several sleeves 32 arranged are communicated with the horizontal tubes 31, so that the heat transfer oil flows between the horizontal tubes 31 and the sleeves 32, increasing the contact area with the heat exchange tubes 2. And the sleeve 32 is sleeved on several heat exchange tubes 2, fully transferring the heat of the heat transfer oil to the mixed xylene in the heat exchange tubes 2, improving the heating efficiency.

[0026] As Figure 6 and Figure 7 shown, optionally, the heating device 3 further includes an oil inlet pipe 3101 and an oil outlet pipe 3201 respectively fixedly connected to one end of two groups of horizontal pipes 31. The oil inlet pipe 3101 and the oil outlet pipe 3201 are respectively communicated with the heat-conducting oil boiler. A temperature sensor 33 is arranged on the oil outlet pipe 3201, and the temperature sensor 33 is used to monitor the temperature of the heat-conducting oil in the oil outlet pipe 3201.

[0027] In this embodiment, the oil inlet pipe 3101 is communicated with the heat-conducting oil boiler, which can continuously supply high-temperature heat-conducting oil to the heating device 3, ensure a stable heat source during the heating process, maintain the continuous operation of the device, and the oil outlet pipe 3201 sends the heat-conducting oil after heat exchange back to the heat-conducting oil boiler to complete the circulation of the heat-conducting oil, so that the heating system can work continuously and stably, improve the energy utilization rate. Through the temperature monitored by the temperature sensor 33, parameters such as the heating power of the heat-conducting oil boiler can be fed back and adjusted in time to ensure that the heat exchange tube 2 obtains stable and required heat and accurately control the heating temperature of the mixed xylene.

[0028] As Figure 7 shown, optionally, the driving assembly includes a support plate 4101 fixedly connected inside the heating box 1. A plurality of moving rods 4102 are slidably connected to the support plate 4101, and the upper ends of the plurality of moving rods 4102 are fixedly connected to the piston 41.

[0029] 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 a set direction, ensure the accurate movement track of the piston 41, and stably realize the blocking and opening actions of the lower end of the heat exchange tube 2, and accurately control the blocking state of the piston 41 on the heat exchange tube 2.

[0030] As Figure 8 shown, optionally, a plurality of connecting plates 4103 are fixedly connected to the lower side of the support plate 4101. A cylindrical rod 4104 is rotatably connected to the plurality of connecting plates 4103. An L-shaped plate 42 is fixedly connected to the cylindrical rod 4104, and sliding grooves 4201 are opened at both ends of the L-shaped plate 42.

[0031] In this embodiment, the cylindrical rod 4104 is rotatably connected to the connecting plate 4103 to provide a rotation fulcrum for the L-shaped plate 42. The L-shaped plate 42 is fixed on the cylindrical rod 4104, changes the direction and action point of the force through its own structure, and cooperates with the sliding groove 4201, so that the L-shaped plate 42 can flexibly adjust the angle within a certain range to adapt to different operating states, thereby realizing the movement of the piston 41.

[0032] As Figure 7As shown, optionally, a push rod 43 is slidably connected inside the heating box 1. One end of the push rod 43 penetrates 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. Fixed blocks are fixedly connected to the outer part of the push rod 43 and the lower end of the chute 4201, and the fixed blocks slide within the chute 4201.

[0033] In this embodiment, since the cylinder 44 is electrically connected to the temperature sensor 33, the movement of the push rod 43 can be precisely controlled according to the temperature of the heat-conducting 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 chute 4201, causing the piston 41 to move downward and opening 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 reverse direction, causing the piston 41 to move upward to block the heat exchange tube 2, realizing the precise control of the process of heating and evaporating the mixed xylene entering the heating box 1.

[0034] As Figure 6 and Figure 7 As shown, optionally, stirring blades 45 are fixedly connected to both ends of the cylindrical rod 4104, and the stirring blades 45 stir the xylene heated and evaporated in the heating box 1.

[0035] In this embodiment, the heated mixed xylene flows into the heating box 1 for heating and evaporation, and the heating temperature is controlled between 110 degrees and 125 degrees. Since the cylindrical rod 4104 drives the stirring blades 45 to swing when rotating, the rotation of the stirring blades 45 can make the xylene in the heating box 1 come into contact with the heater more fully, enabling the xylene to be stirred while heating and evaporating, and 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.

[0036] As Figure 3 and Figure 4 As shown, optionally, a recovery box 5 is arranged at a position near the upper part inside the heating box 1. The recovery box 5 is communicated with the heating box 1 through an air inlet pipe. A condensing pipe is arranged inside the recovery box 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 box 5, and the water outlet pipe of the water pump extends into the filtration box 12 and is arranged above the filter plate 1207. A liquid inlet pipe is arranged on the upper side of the filtration box 12, and the liquid inlet pipe is located above another filter plate 1207.

[0037] In this embodiment, since the boiling point of p-xylene in mixed xylene is 138 °C, the boiling point of o-xylene is 144 °C, the boiling point of m-xylene is 139 °C, and the boiling point of ethylbenzene is 136 °C, when the liquid is heated to 110 °C to 125 °C, only water is heated to become gas while the mixed xylene will not be heated to become gas, realizing the separation of water and mixed xylene. The water vapor after heating and evaporation can enter the recovery tank 5 from the inlet pipe at the top, and the water vapor is condensed into liquid water through the condensing pipe. One end of the water pump is the inlet pipe and the other end is the outlet pipe. One end of the outlet pipe is provided with a spray head, and the spray head is arranged 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 at the same time reducing environmental pollution.

[0038] As Figure 2 and Figure 3 shown, optionally, a filter tank 12 is fixedly connected to the upper side of the heating tank 1. The lower side of the filter tank 12 is communicated with the upper side of the heating tank 1. A filtering component is arranged inside the filter tank 12. The filtering component includes a top plate 1201 fixedly connected inside the filter tank 12. Two feed holes 1202 are opened on the top plate 1201. A side plate 1203 is fixedly connected inside the filter tank 12. Two filter plates 1207 are slidably connected to one side of the side plate 1203, and the two filter plates 1207 are staggered in the horizontal direction. The filter plates 1207 are arranged above the feed holes 1202.

[0039] 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 through the liquid inlet pipe and is filtered by the filter plate 1207 below the liquid inlet pipe. The filtered mixed xylene enters the heat exchange tube 2 through the feed hole 1202.

[0040] As Figure 5 shown, optionally, two mutually staggered 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. A motor 1205 is fixedly connected to one side of the filter tank 12. The output end of the motor 1205 penetrates through one side of the filter tank 12 and is fixedly connected to the gear 1204, and the gear 1204 is meshed with the two racks 1206.

[0041] In this embodiment, when the filter plate 1207 filters the mixed xylene, after long-term use, impurities will accumulate on the filter plate 1207. The motor 1205 is started to drive the gear 1204 to rotate. The gear 1204 drives the two racks 1206 to move relatively. The racks 1206 drive the two filter plates 1207 to move synchronously, so that the filter plate 1207 with impurities is moved below the nozzle. The liquid water sprayed by the nozzle cleans the filter plate 1207 with impurities, while the other clean filter plate 1207 is moved below the liquid inlet pipe to filter the mixed xylene again. The blocked filter plate 1207 is cleaned in time, and its filtering performance can be restored. Each filter plate 1207 put into use is in a good filtering state, which can more effectively intercept impurities in the mixed xylene and improve the purity and quality of the final product.

[0042] Although the present invention is disclosed as above, the protection scope of the present invention 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 these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A refining and purification device for mixed xylene, characterized in that, Including: A heating box (1), inside which there are several heat exchange tubes (2); A heating device (3) for heating the heat exchange tubes (2); A plugging device (4) arranged at the lower end of the heat exchange tube (2). The plugging device (4) includes a piston (41) and a driving component. The piston (41) is slidably connected to a position near the lower end of the heat exchange tube (2). When the temperature inside the heat exchange tube (2) does not reach the preset value, the piston (41) plugs the lower port of the heat exchange tube (2). When the temperature inside the heat exchange tube (2) reaches the preset value, the driving component drives the piston (41) to move out of the lower port of the heat exchange tube (2), so that mixed xylene enters the heating box (1) from the lower port of the heat exchange tube (2).

2. The purification device for mixed xylene according to claim 1, wherein The heating device (3) includes two horizontal tubes (31) arranged perpendicular to the heat exchange tubes (2). A sleeve (32) is fixedly connected between the two horizontal tubes (31), and the sleeve (32) is sleeved on the heat exchange tube (2). The horizontal tube (31) is communicated with the sleeve (32).

3. The purification device for mixed xylene according to claim 2, characterized in that, The heating device (3) further includes an oil inlet pipe (3101) and an oil outlet pipe (3201) respectively fixedly connected to one end of the two horizontal tubes (31). The oil inlet pipe (3101) and the oil outlet pipe (3201) are respectively communicated with a heat-conducting oil boiler. A temperature sensor (33) is arranged on the oil outlet pipe (3201) for monitoring the temperature of the heat-conducting oil in the oil outlet pipe (3201).

4. The refining and purification device for mixed xylene according to claim 1, wherein, The driving component includes a support plate (4101) fixedly connected inside the heating box (1). A plurality of moving rods (4102) are slidably connected to the support plate (4101). The upper ends of the plurality of moving rods (4102) are fixedly connected to the piston (41).

5. The purification device for mixed xylene according to claim 4, characterized in that, A plurality of connecting plates (4103) are fixedly connected to the lower side of the support plate (4101). A cylindrical rod (4104) is rotatably connected to the plurality of connecting plates (4103). An L-shaped plate (42) is fixedly connected to the cylindrical rod (4104). Chutes (4201) are formed at both ends of the L-shaped plate (42).

6. The refined and purified device for mixed xylene according to claim 5, characterized in that, A push rod (43) is slidably connected inside the heating box (1). One end of the push rod (43) penetrates 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). Fixed blocks are fixedly connected to the outside of the push rod (43) and the lower ends of the chutes (4201), and the fixed blocks slide in the chutes (4201).

7. The purification device for mixed xylene according to claim 5, wherein, Agitating blades (45) are fixedly connected to both ends of the cylindrical rod (4104) for agitating the xylene heated and evaporated in the heating box (1).

8. The refined purification device for mixed xylene according to claim 1, characterized in that, A recovery box (5) is arranged at a position near the upper part inside the heating box (1). The recovery box (5) is communicated with the heating box (1) through an air inlet pipe. A condensing pipe is arranged inside the recovery box (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 box (5), and the water outlet pipe of the water pump extends into the filtering box (12) and is arranged above the filter plate (1207). A liquid inlet pipe is arranged on the upper side of the filtering box (12), and the liquid inlet pipe is located above the other filter plate (1207).

9. The purification device for mixed xylene according to claim 8, wherein, A filtering box (12) is fixedly connected to the upper side of the heating box (1). The lower side of the filtering box (12) is communicated with the upper side of the heating box (1). A filtering component is arranged inside the filtering box (12). The filtering component includes a top plate (1201) fixedly connected inside the filtering box (12). Two feeding holes (1202) are formed in the top plate (1201). Side plates (1203) are fixedly connected inside the filtering box (12). Two filter plates (1207) are slidably connected to one side of the side plates (1203), and the two filter plates (1207) are staggered with each other in the horizontal direction. The filter plates (1207) are arranged above the feeding holes (1202).

10. The refined and purified device for mixed xylene according to claim 9, wherein, Two racks (1206) arranged in a staggered manner are slidably connected to one side of the side plates (1203). A gear (1204) is rotatably connected to one side of the side plates (1203). A motor (1205) is fixedly connected to one side of the filtering box (12). The output end of the motor (1205) penetrates through one side of the filtering box (12) and is fixedly connected to the gear (1204), and the gear (1204) is meshed with the two racks (1206).

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