A xylene recovery device

Abstract

The application discloses a xylene recycling device, relates to the technical field of xylene recycling, and comprises a distillation tower, a condensing tank, a condensing pipe, a refrigeration circulating machine and a liquid storage tank, further comprises scraping equipment and liquid discharge equipment, the scraping equipment comprises a scraping piece arranged on the condensing pipe, an annular flexible scraper is arranged in the scraping piece, the liquid discharge equipment is arranged at the bottom of the scraping piece, liquid on the condensing pipe is scraped through the annular flexible scraper, comprehensive cleaning of the condensing pipe is realized, the cleaning effect is better, and the scraped liquid is recycled through cooperation of the scraping equipment and the liquid discharge equipment, so that the recycling effect of xylene is better, and resource waste is avoided.

Description

TECHNICAL FIELD

[0001] The application relates to a xylene recycling device. BACKGROUND

[0002] Xylene is a colorless transparent liquid; it is a product in which two hydrogens on a benzene ring are replaced by methyl groups, and exists in three isomers of ortho-xylene, meta-xylene and para-xylene. In industry, xylene refers to a mixture of the above isomers. Xylene has a pungent odor, is flammable, can be mixed with ethanol, chloroform or ether at will, is insoluble in water, and has a boiling point of 137-140 DEG C. Xylene belongs to low-toxicity chemical substances. It can come from fuel and tobacco combustion gas, and is widely used in the industries of paint, resin, dye, ink, etc. as a solvent, and is used in the industries of medicine, explosive, pesticide, etc. as a synthetic monomer or solvent, and can also be used as a high-octane gasoline component, and is an important raw material for organic chemical industry. It can also be used for removing asphalt from a vehicle body. In a hospital pathology department, it is mainly used for the transparency and dewaxing of tissues and sections. Industrial ortho-xylene is used as a raw material, washed with industrial concentrated sulfuric acid until the acid layer is colorless, then washed with 10% sodium hydroxide solution and water until it is qualified, separated from the water layer, dried with anhydrous calcium chloride, then rectified, and after the distillate is clear, the middle fraction is collected, which is the pure product. In industry, ortho-xylene is separated from mixed xylene by super rectification. The boiling points of ortho-xylene and other components in mixed xylene differ by more than 5 DEG C, so about 150 trays and a reflux ratio of 5-8 are needed in rectification, which consumes a large amount of energy. It is obtained from the light oil part of fractionated coal tar or catalytic reforming light oil by fractionation, or from toluene by disproportionation.

[0003] A xylene condensation recovery device is disclosed in the prior art Chinese utility model patent with the publication number CN210751364U, which comprises a condensation tank mounted on the upper end of a frame, a gas inlet pipe fixedly connected to the left end of the condensation tank and communicating with the condensation tank, a gas outlet pipe fixedly connected to the right upper end of the condensation tank and communicating with the condensation tank, an air extractor fixedly connected to the end of the gas outlet pipe away from the condensation tank, a discharge pipe fixedly connected to the right end of the air extractor, a fixed support fixedly connected in the condensation tank, a condensation coil group fixedly connected to the right end of the fixed support, a refrigeration cycle machine installed in the frame and communicating with the condensation coil group, a liquid guide pipe fixedly connected to the left lower end of the condensation tank and communicating with the condensation tank, and a liquid storage tank fixedly connected to the left end of the liquid guide pipe and communicating with the liquid guide pipe. Xylene in chemical tail gas is removed by condensation, the treatment process is simple and effective, the cost can be effectively saved, and the xylene can be recycled and reused by the staff, so that resources can be effectively saved.

[0004] However, the above device still has the following defects: 1. Low recovery rate: In order to ensure the normal operation of the condenser pipe, the flexible scraper is used to remove the liquid on the condenser pipe, but the liquid in the bucket after removal is easy to adhere to the flexible scraper, affecting the subsequent collection work and causing resource waste; 2. Poor cleaning effect: the above device only uses the rotating flexible scraper to clean the condenser pipe, but since the flexible scraper only rotates, it can only clean part of the condenser pipe, and it is difficult to clean the condenser pipe comprehensively, resulting in poor cleaning effect. SUMMARY

[0005] The purpose of the present application is to provide a xylene recycling device to solve the technical problems of low recovery rate and poor cleaning effect in the prior art.

[0006] The present application provides a xylene recycling device, comprising a distillation column, a condenser tank, a condenser pipe, a refrigeration cycle machine and a liquid storage tank, the distillation column is arranged on one side of the condenser tank, and the distillation column and the condenser tank are communicated through an air inlet pipe, the condenser pipe is arranged in the condenser tank, the refrigeration cycle machine is arranged at the bottom of the condenser tank, and the refrigeration cycle machine is communicated with the condenser pipe, the liquid storage tank is arranged on the other side of the condenser tank, and the liquid storage tank is communicated with the liquid outlet pipe of the condenser tank, the top of the distillation column is provided with an exhaust pipe, further comprising a scraping device and a liquid discharge device, the scraping device comprises a scraping member sleeved on the condenser pipe, the inner diameter of the scraping member is larger than the outer diameter of the condenser pipe, the scraping member is internally provided with an annular flexible scraper, and both sides of the annular flexible scraper are provided with annular liquid guide grooves, the bottom of the scraping member is provided with a liquid guide hole, and the liquid guide hole is communicated with the liquid guide groove, the liquid discharge device is arranged at the bottom of the scraping member, and the liquid discharge device is used to assist the scraping member to discharge liquid.

[0007] Further, the scraping device further comprises a moving screw rod rotatably arranged in the condenser tank, one side of the condenser tank is further provided with a motor, the main shaft of the motor penetrates through the condenser tank and is fixedly connected with the moving screw rod, a moving block is arranged on the screw rod through thread cooperation, and the moving block is fixedly connected with the scraping member.

[0008] Further, the top of the scraping member is further provided with a drainage groove for draining accumulated liquid, and the drainage groove is communicated with the liquid guide groove.

[0009] Further, the aperture of the scraping member gradually decreases from the center to both ends.

[0010] Further, the liquid discharge device comprises a connecting pipe, a liquid discharge pipe, a pressure pipe, a piston and a cam, the connecting pipe is arranged at the bottom of the scraping member and communicates with the liquid guide opening, the liquid discharge pipe is arranged at the bottom of the connecting pipe in communication and is fixedly connected with the moving block, two one-way valves are arranged on the liquid discharge pipe, one end of the pressure pipe is arranged on the liquid discharge pipe in communication and is located between the two one-way valves, the piston is slidably arranged in the pressure pipe, and a piston rod is arranged on the side of the piston away from the liquid discharge pipe, a tension spring is sleeved on the piston rod, the other end of the pressure pipe is provided with a support frame, a rotating shaft is rotatably arranged on the support frame, and the cam is fixedly arranged on the rotating shaft, and one end of the piston rod is provided with an arc-shaped block which abuts against the cam.

[0011] Further, the liquid discharge device further comprises a rack and a gear, the gear is fixedly arranged on the rotating shaft, and the rack is fixedly arranged in the condensing box and is slidably connected with the support frame.

[0012] Further, a flow guide inclined plate is arranged at the bottom of the inner side of the condensing box, and the lowest end of the flow guide inclined plate corresponds to the liquid outlet pipe.

[0013] Compared with the prior art, the beneficial effects of the present application are as follows:

[0014] (1) The scraping member drives the annular flexible scraper to scrape the liquid condensed on the condensing pipe, and the liquid enters the liquid guide opening through the annular liquid guide groove, and finally the liquid is discharged in cooperation with the liquid discharge device, so that the condensing efficiency of the condensing pipe is not affected by the liquid, and the inner diameter of the scraping member is larger than the outer diameter of the condensing pipe, so that the liquid is scraped off the scraping member when the scraping member first contacts the liquid, and the liquid is accumulated on other components, affecting the recovery rate of the liquid, and the liquid on the condensing pipe is scraped by the annular flexible scraper, achieving comprehensive cleaning of the condensing pipe, and the cleaning effect is better, and the liquid after scraping is recovered and treated by the scraping device and the liquid discharge device, so that the recovery effect of xylene is better, and resource waste is avoided.

[0015] (2) The arrangement of the drainage groove can avoid the accumulation of liquid on the top of the scraping member, which affects the complete recovery of xylene liquid and affects the recovery effect.

[0016] (3) The arrangement of the aperture of the scraping member can prevent the liquid from flowing out from both sides of the scraping member, and can control the liquid to flow out only through the liquid guide opening, further preventing the liquid from accumulating on other components and affecting the recovery rate of the liquid.

[0017] The application can make the piston reciprocating movement generate suction force on the upper part of the liquid discharge pipe and pressure on the lower part of the liquid discharge pipe through the setting of two one-way valves on the liquid discharge pipe, so that the liquid discharge pipe can generate suction force on the connecting pipe through the connection of the connecting pipe, and further transport to the scraping member, so as to realize the suction of the liquid in the scraping member and the discharge from the bottom of the liquid discharge pipe, so as to avoid the accumulation of part of the liquid in the scraping member and affect the subsequent collection operation, and further ensure the recovery rate of the device to the xylene liquid. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application;

[0020] Figure 2 It is a schematic diagram of the internal structure of the condensing box of the present application;

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the scraping device in the present application;

[0022] Figure 4 It is a three-dimensional structure sectional view of the scraping member in the present application;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the liquid discharge device in the present application;

[0024] Figure 6 It is a three-dimensional structure sectional view of the pressure pipe in the present application.

[0025] Reference signs:

[0026] 1, distillation column; 2, condensing box; 3, condensing pipe; 4, refrigeration circulating machine; 5, liquid storage tank; 6, liquid outlet pipe; 7, exhaust pipe; 8, scraping device; 81, scraping member; 82, annular flexible scraper; 83, annular liquid guide groove; 84, liquid guide port; 85, moving screw rod; 86, motor; 87, moving block; 88, drainage groove; 9, liquid discharge device; 91, connecting pipe; 92, liquid discharge pipe; 93, pressure pipe; 94, piston; 95, cam; 96, one-way valve; 97, piston rod; 98, tension spring; 99, support frame; 910, rotating shaft; 911, rack; 912, gear; 913, arc block; 10, flow guide inclined plate. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, but not all the embodiments.

[0028] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0029] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0030] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, but not all the embodiments. Figures 1 to 6As shown, the embodiment of the present application provides a xylene recycling device, which comprises a distillation tower 1, a condensing box 2, a condensing pipe 3, a refrigeration circulating machine 4 and a liquid storage tank 5, the distillation tower 1 is arranged on one side of the condensing box 2, and the distillation tower 1 and the condensing box 2 are communicated through an air inlet pipe, the condensing pipe 3 is arranged in the condensing box 2, the refrigeration circulating machine 4 is arranged at the bottom of the condensing box 2, and the refrigeration circulating machine 4 is communicated with the condensing pipe 3, the liquid storage tank 5 is arranged on the other side of the condensing box 2, and the liquid storage tank 5 is communicated with a liquid outlet pipe 6 of the condensing box 2, the top of the distillation tower 1 is provided with an exhaust pipe 7, and the device further comprises a scraping device 8 and a liquid discharge device 9, the scraping device 8 comprises a scraping part 81 sleeved on the condensing pipe 3, the inner diameter of the scraping part 81 is greater than the outer diameter of the condensing pipe 3, an annular flexible scraper 82 is arranged in the scraping part 81, and annular liquid guide grooves 83 are arranged on both sides of the annular flexible scraper 82, a liquid guide opening 84 is arranged at the bottom of the scraping part 81, and the liquid guide opening 84 is communicated with the liquid guide groove, the liquid discharge device 9 is arranged at the bottom of the scraping part 81, and the liquid discharge device 9 is used for assisting the scraping part 81 to discharge liquid, when the device works, the xylene to be treated is introduced into the distillation tower 1, the xylene is evaporated by the distillation tower 1 and introduced into the condensing box 2, the condensing pipe 3 is continuously condensed by the continuous work of the refrigeration circulating machine 4, at this time, the temperature on the condensing pipe 3 is low, so that the gas is condensed into liquid on the condensing pipe 3, at this time, the scraping device 8 works, the scraping part 81 moves, the liquid condensed on the condensing pipe 3 can be scraped by the annular flexible scraper 82 when the scraping part 81 moves, and the liquid enters the liquid guide opening 84 through the annular liquid guide groove 83, finally, the liquid is discharged in cooperation with the liquid discharge device 9, so as to avoid the influence of the liquid on the condensing efficiency of the condensing pipe 3, and the setting that the inner diameter of the scraping part 81 is greater than the outer diameter of the condensing pipe 3 can avoid that the liquid is scraped outside the scraping part 81 when the scraping part 81 just contacts with the liquid, so that the liquid is accumulated on other components, and the liquid recovery rate is affected, the condensed liquid is stored in the liquid storage tank 5 through the liquid outlet pipe 6, the exhaust pipe 7 can be connected with a fan, and the treated gas in the condensing box 2 is discharged, so as to realize the recycling treatment of the xylene, the liquid on the condensing pipe 3 is scraped by the annular flexible scraper 82, the condensing pipe 3 is completely cleaned, the cleaning effect is better, the scraped liquid is recycled by the cooperation of the scraping device 8 and the liquid discharge device 9, the recycling effect of the xylene is better, and resource waste is avoided.

[0033] Preferably, the scraping device 8 further comprises a moving screw rod 85 arranged inside the condensing box 2, and a motor 86 is arranged on one side of the condensing box 2, a main shaft of the motor 86 is fixedly connected with the moving screw rod 85 after penetrating through the condensing box 2, a moving block 87 is arranged on the screw rod through threaded cooperation, the moving block 87 is fixedly connected with the scraping piece 81, and the motor 86 is operated to drive the screw rod to rotate and in turn drive the moving block 87 and the scraping piece 81 to move radially, so that the cleaning work of the scraping piece 81 on the condensing pipe 3 is facilitated.

[0034] Preferably, the top of the scraping piece 81 is further provided with a drainage groove 88 for draining accumulated liquid, and the drainage groove 88 is in communication with the liquid guide groove, the arrangement of the drainage groove 88 can avoid the accumulation of liquid on the top of the scraping piece 81, so that the recovery of xylene liquid is not complete and the recovery effect is affected.

[0035] Preferably, the aperture of the scraping piece 81 gradually decreases from the center to both ends, when the annular flexible scraper 82 performs the scraping work on the condensing pipe 3, the scraped liquid will remain in the scraping piece 81, at this time, due to the arrangement of the aperture of the scraping piece 81, the liquid can be prevented from flowing out from both sides of the scraping piece 81, the liquid can be controlled to flow out only through the liquid guide opening 84, and further, the liquid can be prevented from accumulating on other components to affect the recovery rate of the liquid.

[0036] Preferably, the liquid discharge device 9 comprises a connecting pipe 91, a liquid discharge pipe 92, a pressure pipe 93, a piston 94 and a cam 95, the connecting pipe 91 is arranged at the bottom of the scraping member 81 and communicates with the liquid guide hole 84, the liquid discharge pipe 92 is arranged at the bottom of the connecting pipe 91 in communication, and the liquid discharge pipe 92 is fixedly connected with the moving block 87, two one-way valves 96 are arranged on the liquid discharge pipe 92, one end of the pressure pipe 93 is arranged in communication on the liquid discharge pipe 92, and the pressure pipe 93 is located between the two one-way valves 96, the piston 94 is slidingly arranged in the pressure pipe 93, and a piston rod 97 is arranged on the side of the piston 94 away from the liquid discharge pipe 92, the piston rod 97 is sleeved with a tension spring 98, the other end of the pressure pipe 93 is provided with a support frame 99, the support frame 99 is rotatably provided with a rotating shaft 910, the cam 95 is fixedly arranged on the rotating shaft 910, one end of the piston rod 97 is provided with an arc block 913, the arc block 913 is in contact with the cam 95, when the cam 95 rotates to the protruding part in contact with the arc block 913, the piston rod 97 and the piston 94 are pushed to move, when the cam 95 rotates again by 180 degrees, the piston rod 97 and the piston 94 are reset through the tension spring 98, so as to realize the reciprocating movement of the piston 94, and due to the arrangement of the two one-way valves 96 on the liquid discharge pipe 92, the suction force on the upper part of the liquid discharge pipe 92 and the pressure on the lower part of the liquid discharge pipe 92 can be generated when the piston 94 moves reciprocally, so that the liquid discharge pipe 92 can generate suction force on the connecting pipe 91 through the connection of the connecting pipe 91, and further transport to the scraping member 81, so as to realize the suction of the liquid in the scraping member 81 and the discharge from the bottom of the liquid discharge pipe 92, so as to avoid the accumulation of part of the liquid in the scraping member 81 and affect the subsequent collection work, and further ensure the recovery rate of the xylene liquid of the device.

[0037] Preferably, the liquid discharge device 9 further comprises a rack 911 and a gear 912, the gear 912 is fixedly arranged on the rotating shaft 910, the rack 911 is fixedly arranged in the condensing box 2, and the support frame 99 is slidingly connected with the rack 911, the gear 912 is engaged with the rack 911, when the moving member moves, the connecting pipe 91 moves, and the support frame 99 and the gear 912 move together, when the gear 912 moves, the gear 912 rotates and drives the cam 95 coaxial with the gear 912 to rotate, thereby realizing the reciprocating movement of the piston 94.

[0038] Preferably, the condensing box 2 is provided with a flow guide inclined plate 10 at the bottom of the inner side, and the lowest end of the flow guide inclined plate 10 corresponds to the liquid outlet pipe 6, so as to facilitate the drainage of the xylene liquid to the liquid outlet pipe 6 and assist the liquid storage tank 5 to collect.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A xylene recycling device comprising a distillation column, a condensing tank, a condensing tube, a refrigeration cycle machine and a liquid storage tank, wherein the distillation column is connected to the condensing tank through an inlet pipe, the condensing tube is arranged in the condensing tank, the refrigeration cycle machine is arranged at the bottom of the condensing tank and is connected to the condensing tube, and the liquid storage tank is connected to the outlet pipe of the condensing tank, and the top of the distillation column is provided with an exhaust pipe, characterized in that, The scraping device comprises a scraping piece sleeved on the condensing pipe, the inner diameter of the scraping piece is larger than the outer diameter of the condensing pipe, an annular flexible scraper is arranged inside the scraping piece, annular liquid guide grooves are arranged on both sides of the annular flexible scraper, a liquid guide opening is arranged at the bottom of the scraping piece and communicates with the liquid guide grooves, and the liquid discharge device is arranged at the bottom of the scraping piece and is used for assisting the scraping piece to discharge liquid. The scraping device further comprises a moving screw rod rotatably arranged inside the condensing box, a moving block is threadedly arranged on the screw rod, and the moving block is fixedly connected with the scraping piece. The liquid discharge device comprises a connecting pipe, a liquid discharge pipe, a pressure pipe, a piston and a cam, the connecting pipe is arranged at the bottom of the scraping piece and communicates with the liquid guide opening, the liquid discharge pipe is communicatively arranged at the bottom of the connecting pipe, the liquid discharge pipe is fixedly connected with the moving block, two one-way valves are arranged on the liquid discharge pipe, one end of the pressure pipe is communicatively arranged on the liquid discharge pipe and located between the two one-way valves, the piston is slidably arranged in the pressure pipe, a piston rod is arranged on the side of the piston away from the liquid discharge pipe, a tension spring is sleeved on the piston rod, the other end of the pressure pipe is provided with a support frame, a rotating shaft is rotatably arranged on the support frame, the cam is fixedly arranged on the rotating shaft, one end of the piston rod is provided with an arc-shaped block, and the arc-shaped block abuts against the cam.

2. The xylene recovery device of claim 1, wherein, One side of the condensing box is further provided with a motor, the main shaft of the motor penetrates through the condensing box and is fixedly connected with the moving screw rod. The distillation tower is arranged on one side of the condensing box, and the liquid storage tank is arranged on the other side of the condensing box.

3. The xylene recovery device of claim 1, wherein, The top of the scraping piece is further provided with a drainage groove for draining accumulated liquid, and the drainage groove communicates with the liquid guide grooves.

4. The xylene recovery device of claim 1, wherein, The hole diameter of the scraping piece gradually decreases from the center to both ends.

5. The xylene recovery device of claim 1, wherein, The liquid discharge device further comprises a rack and a gear, the gear is fixedly arranged on the rotating shaft, the rack is fixedly arranged inside the condensing box, the support frame is slidably connected with the rack, and the gear is engaged with the rack.

6. The xylene recovery device of claim 1, wherein, The inner bottom of the condensing box is provided with a flow guide inclined plate, and the lowest end of the flow guide inclined plate corresponds to the liquid outlet pipe.

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