Safe toluene recovery device for p-tolyl isocyanate production

Abstract

The invention discloses a safe toluene recovery device for p-tolyl isocyanate production. The safe toluene recovery device comprises a bottom plate, a recovery assembly, a solution mixing assembly and a cleaning assembly. According to the safe toluene recovery device for p-tolyl isocyanate production, the liquid carrying box can reciprocate in the vertical direction, so that the liquid carrying box carries a stock solution on the lower middle portion to the upper portion, meanwhile, the circulating liquid pipe rotates to drive the L-shaped stirring rod to rotate, the stock solution located at the bottom passes through the water pump and the circulating liquid pipe, the stock solution is fed into the liquid collecting box and the branch pipe, and then the stock solution is recycled. And the toluene gas is uniformly scattered on the filter plate through the liquid discharge holes in the branch pipes, so that the stock solution is heated more uniformly, the distillation speed of the stock solution is increased, and the distilled toluene gas is collected. Besides, an annular sliding rail reciprocates left and right to drive a mounting plate and a cleaning brush to move, so that the cleaning brush cleans the filter plate, the filtering effect of the filter plate is improved, the purity of the stock solution is higher, and the recycling effect of the methylbenzene gas is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of distillation recovery of p-tolyl isocyanate stock solution, in particular to a toluene safety recovery device for p-tolyl isocyanate production. Background Art

[0002] p-Tolyl isocyanate is used as a pesticide intermediate in the preparation of pesticides. The synthesis of p-tolyl isocyanate can be prepared by a one-step reaction of toluidine and phosgene in an inert solvent medium to produce liuron, diuron, etc. It is an important organic reagent and intermediate. In the production process of p-tolyl isocyanate, a toluene recovery device is required to achieve resource recycling.

[0003] However, when the toluene recovery device of the prior art is in use, the distillation process of the solvent stock solution is relatively slow, which reduces the speed of toluene distillation and the efficiency of toluene recovery, which is not conducive to the recovery of toluene; and when the existing toluene recovery device distills the stock solution, the stock solution may contain impurities and enter the interior of the distillation device through the feed port, which easily causes dirt to form inside the distillation device, thereby affecting the use of the device. For this reason, we propose a safe toluene recovery device for the production of p-tolyl isocyanate. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a toluene safety recovery device for the production of p-tolyl isocyanate. The liquid-carrying box can reciprocate in the up and down directions, so that the liquid-carrying box carries the raw liquid in the middle and lower parts to the upper part. At the same time, the circulation liquid pipe rotates to drive the L-shaped stirring rod to rotate, and the raw liquid at the bottom passes through the water pump and the circulation liquid pipe, and the raw liquid is sent to the liquid collecting box and the branch pipe, and is evenly sprinkled on the filter plate through the drainage holes on the branch pipe, so that the raw liquid is heated more evenly, thereby increasing the distillation speed of the raw liquid, and the toluene gas after distillation is collected. In addition, the mounting plate and the cleaning brush are driven to move by the reciprocating left and right motion of the annular slide rail, so that the cleaning brush can clean the filter plate to improve the filtering effect of the filter plate, so that the purity of the raw liquid is higher, and the recovery effect of the toluene gas is further improved, which can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a toluene safety recovery device for the production of p-tolyl isocyanate, comprising a bottom plate, a recovery component, a solution mixing component and a cleaning component; A distillation box is installed on the upper surface of the bottom plate, and a recovery component is also installed on the upper surface of the bottom plate, the recovery component is connected to the top of the distillation box, a feed pipe is installed on the upper left side of the distillation box, a first control valve is installed on the feed pipe, a discharge pipe is installed on the front bottom of the distillation box, a second control valve is installed on the discharge pipe, a filter plate is installed in the middle of the interior of the distillation box, a plurality of first filter holes are evenly opened on the filter plate, a circulating liquid pipe is rotatably installed on the middle of the filter plate, a water pump is installed on the inner bottom surface of the distillation box, and a water inlet of the water pump is installed. A liquid inlet pipe, a water outlet of the water pump and a circulating liquid pipe are rotatably connected, the upper end of the circulating liquid pipe is connected and installed with a liquid collecting box, a plurality of branch pipes are evenly installed on the circumferential outer surface of the liquid collecting box, a plurality of drainage holes are evenly opened on the lower surface of the branch pipes, a cleaning component is installed in the middle of the distillation box, the cleaning component is located above the filter plate, a plurality of electric heating tubes are evenly installed at the lower part of the distillation box, a solution mixing component is also installed at the lower part of the distillation box, the solution mixing component is located above the electric heating tube, and the input end of the electric heating tube is electrically connected to the output end of the temperature control switch.

[0006] Furthermore, the solution mixing assembly includes a liquid carrier box and four L-shaped stirring rods evenly installed on the outer surface of the circulating liquid pipe, the lower ends of the four L-shaped stirring rods are jointly installed with an annular plate, the lower surface of the annular plate is evenly installed with a plurality of tooth blocks to form a special-shaped gear, a rotating shaft is rotatably installed in the middle of the four sides of the inner surface of the distillation box, the rotating shaft is installed with a first gear, the first gear and the special-shaped gear are meshed and connected, one end of the second connecting rod is installed at the inner end of the rotating shaft, and the other end of the second connecting rod is rotatably installed with a third connecting rod through a first pin shaft, fixing pins are installed in the middle of the four sides of the outer surface of the liquid carrier box, and the third connecting rod is rotatably connected with the corresponding fixing pin, second filtering holes are evenly opened on the liquid carrier box, a through hole is opened on the liquid carrier box, and the circulating liquid pipe is penetrated in the through hole, a driving assembly is installed on the front side of the distillation box, the rotating shaft installed on the front side of the distillation box protrudes from the outer surface of the distillation box, and the driving assembly is connected to the outer end of a rotating shaft. A rotating shaft is driven by a driving component, and the rotation of the rotating shaft drives the first gear to rotate, and the rotation of the first gear drives the special-shaped gear and the circulating liquid pipe to rotate. The rotation of the circulating liquid pipe can make the raw liquid discharged from the drainage hole of the branch pipe fall more evenly on the filter plate. The rotation of the special-shaped gear drives the rotation of several other first gears, and the rotation of the first gear drives the second connecting rod to rotate, and the rotation of the second connecting rod drives the third connecting rod to move, so that the liquid carrying box can reciprocate in the up and down directions, so that the liquid carrying box carries the raw liquid from the middle and lower part to the upper part. At the same time, the rotation of the circulating liquid pipe drives the L-shaped stirring rod to rotate, thereby further improving the mixing of the raw liquid and the uniform heating effect, so that the raw liquid can be better distilled, thereby improving the recovery effect of toluene.

[0007] The cleaning assembly comprises an annular slide rail, a belt and a bow frame installed on the front side of the distillation box, a fixed shaft is rotatably installed on the inner side of the bow frame, a first pulley is installed on the fixed shaft, and a second pulley is installed on the front rotating shaft, the first pulley and the second pulley are connected by belt transmission, a first connecting rod is installed at the front end of the fixed shaft, two slide grooves are opened on the front side of the distillation box, connecting brackets are installed on both sides of the annular slide rail, mounting plates are installed on the end sides of the connecting bracket, a cleaning brush is installed on the lower surface of the mounting plate, limit grooves are provided on both sides of the slide groove, limit plates are installed on both sides of the mounting plate, the limit plates are slidably installed in the limit grooves, the mounting plate is slidably installed in the slide groove, a sliding column is installed on the outer end side of the first connecting rod, the sliding column is located in the annular slide rail, and discharge grooves are opened at the two end side walls corresponding to the filter plate of the distillation box, and a sealing plate is sealed in the discharge groove. When the rotating shaft rotates, it also drives the second pulley to rotate. Under the action of the first pulley, the second pulley and the belt, the rotation of the second pulley drives the first pulley to rotate. The rotation of the first pulley drives the fixed shaft to rotate. The rotation of the fixed shaft drives the first connecting rod to rotate. The rotation of the first connecting rod drives the sliding column to move. The movement of the sliding column makes the annular slide rail reciprocate left and right under the action of the limit plate and the limit groove. The reciprocating motion of the annular slide rail drives the mounting plate and the cleaning brush to move, so that the cleaning brush can clean the filter plate.

[0008] Furthermore, the driving assembly includes a motor bracket installed on the front side of the distillation box, a motor is installed on the motor bracket, the output shaft of the motor is connected to the front end of the front shaft through a coupling, and the input end of the motor is electrically connected to the output end of the external controller. The motor is controlled by the external controller, and the motor drives the shaft to rotate, thereby completing the rotation of the shaft by electric power.

[0009] Furthermore, the recovery component includes a toluene recovery box installed on the upper surface of the bottom plate, the upper surface of the toluene recovery box is connected to the outlet of the condenser, the inlet of the condenser is installed with a collecting pipe, the upper surface of the distillation box is installed with multiple gas outlet pipes, the upper ends of the multiple gas outlet pipes are connected to a gas collecting ring, and the other end of the collecting pipe is connected to the gas collecting ring. The evaporated toluene gas passes through the gas outlet pipe, the gas collecting ring, and the collecting pipe and enters the condenser for condensation, so as to be safely stored in the toluene recovery box to improve the safety of recycling.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: the toluene safety recovery device for the production of toluene isocyanate can reciprocate in the up and down directions through the liquid-carrying box, so that the liquid-carrying box carries the raw liquid in the middle and lower part to the upper part, and at the same time, the circulation liquid pipe rotates to drive the L-shaped stirring rod to rotate, and the raw liquid at the bottom passes through the water pump and the circulation liquid pipe, and the raw liquid is sent to the liquid collecting box and the branch pipe, and is evenly sprinkled on the filter plate through the drainage holes on the branch pipe, so that the raw liquid is heated more evenly, thereby increasing the distillation speed of the raw liquid, and the toluene gas after distillation is collected. In addition, the mounting plate and the cleaning brush are driven to move by the reciprocating left and right motion of the annular slide rail, so that the cleaning brush can clean the filter plate to improve the filtering effect of the filter plate, so that the purity of the raw liquid is higher, and the recovery effect of the toluene gas is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a rear view structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 4 It is a schematic diagram of the structure of the solution mixing component of the present invention.

[0012] In the figure: 1 bottom plate, 2 distillation box, 3 air outlet pipe, 4 air collecting ring, 5 feed pipe, 6 first control valve, 7 sealing plate, 8 limit plate, 9 connecting bracket, 10 annular slide rail, 11 first connecting rod, 12 first pulley, 13 slide groove, 14 belt, 15 second pulley, 16 second control valve, 17 discharge pipe, 18 motor bracket, 19 motor, 20 collection pipe, 21 toluene recovery box, 22 condenser, 23 liquid collecting box, 24 branch pipe, 25 filter plate, 26 first filter hole, 27 second filter hole, 28 liquid carrying box, 29 L-shaped stirring rod, 30 circulating liquid pipe, 31 water pump, 32 first gear, 33 rotating shaft, 34 electric heating tube, 35 cleaning brush, 36 mounting plate, 37 annular plate, 38 tooth block, 39 second connecting rod, 40 third connecting rod. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] See also Figure 1-4 , this embodiment provides a technical solution: Embodiment 1: A toluene safety recovery device for the production of p-tolyl isocyanate, comprising a base plate 1, a recovery component, a solution mixing component and a cleaning component; A distillation box 2 is installed on the upper surface of the bottom plate 1, and a recovery component is also installed on the upper surface of the bottom plate 1. The recovery component is connected to the top of the distillation box 2. A feed pipe 5 is installed on the upper left side of the distillation box 2, and a first control valve 6 is installed on the feed pipe 5. A discharge pipe 17 is installed on the front bottom of the distillation box 2, and a second control valve 16 is installed on the discharge pipe 17. A filter plate 25 is installed in the middle of the interior of the distillation box 2, and a plurality of first filter holes 26 are evenly opened on the filter plate 25. A circulating liquid pipe 30 is rotatably installed in the middle of the filter plate 25. A water pump 31 is installed on the inner bottom surface of the distillation box 2, and the water inlet of the water pump 31 is installed. There is a liquid inlet pipe, the water outlet of the water pump 31 and the circulating liquid pipe 30 are rotatably connected, the upper end of the circulating liquid pipe 30 is connected and installed with a liquid collecting box 23, a plurality of branch pipes 24 are evenly installed on the circumferential outer surface of the liquid collecting box 23, and a plurality of drainage holes are evenly opened on the lower surface of the branch pipe 24. A cleaning component is installed in the middle of the distillation box 2, and the cleaning component is located above the filter plate 25. A plurality of electric heating tubes 34 are evenly installed at the lower part of the distillation box 2. A solution mixing component is also installed at the lower part of the distillation box 2, and the solution mixing component is located above the electric heating tube 34. The input end of the electric heating tube 34 is electrically connected to the output end of the temperature control switch.

[0015] When toluene is recovered, the raw liquid is sent into the distillation box 2 through the feed pipe 5, and the raw liquid is filtered through the filter plate 25 to better collect toluene. The temperature control switch controls the electric heating tube 34 to heat the raw liquid, so that the toluene evaporates into gas and is collected by the recovery component. At the same time, the solution mixing component is started to fully mix the raw liquid so that the raw liquid is heated more evenly, thereby increasing the distillation rate of the raw liquid. The toluene gas after distillation is collected, and the cleaning component can clean the filter plate 25 to improve the filtering effect of the filter plate 25, so that the raw liquid has higher purity and further improves the recovery effect of toluene gas. In addition, the raw liquid at the bottom passes through the water pump 31 and the circulating liquid pipe 30, and the raw liquid is sent to the liquid collecting box 23 and the branch pipe 24, and is evenly sprinkled on the filter plate 25 through the drainage holes on the branch pipe 24.

[0016] Embodiment 2: On the basis of the first embodiment, in this embodiment, the solution mixing assembly includes a liquid carrier box 28 and four L-shaped stirring rods 29 evenly installed on the outer surface of the circulating liquid pipe 30, and the lower ends of the four L-shaped stirring rods 29 are commonly installed with an annular plate 37, and the lower surface of the annular plate 37 is evenly installed with a plurality of tooth blocks 38 to form a special-shaped gear. The middle part of the four sides of the inner surface of the distillation box 2 is rotatably installed with a rotating shaft 33, and the rotating shaft 33 is installed with a first gear 32, and the first gear 32 is meshed with the special-shaped gear. The inner end of the rotating shaft 33 is installed with a second connecting rod One end of the second connecting rod 39, the other end of the second connecting rod 39 is rotatably installed with a third connecting rod 40 through a first pin shaft, fixing pins are installed in the middle of the four sides of the outer surface of the liquid carrying box 28, the third connecting rod 40 is rotatably connected with the corresponding fixing pins, second filter holes 27 are evenly opened on the liquid carrying box 28, a through hole is opened on the liquid carrying box 28, the circulating liquid pipe 30 is passed through the through hole, a driving assembly is installed on the front side of the distillation box 2, a rotating shaft 33 installed on the front side of the distillation box 2 protrudes from the outer surface of the distillation box 2, and the driving assembly is connected to the outer end of a rotating shaft 33. A rotating shaft 33 is driven by a driving component. The rotation of the rotating shaft 33 drives the first gear 32 to rotate. The rotation of the first gear 32 drives the special-shaped gear and the circulating liquid pipe 30 to rotate. The rotation of the circulating liquid pipe 30 can make the raw liquid discharged from the drainage hole of the branch pipe 24 fall more evenly on the filter plate 25. The rotation of the special-shaped gear drives the other first gears 32 to rotate. The rotation of the first gear 32 drives the second connecting rod 39 to rotate. The rotation of the second connecting rod 39 drives the third connecting rod 40 to move, so that the liquid carrying box 28 can reciprocate in the up and down directions, so that the liquid carrying box 28 carries the raw liquid from the middle and lower part to the upper part. At the same time, the rotation of the circulating liquid pipe 30 drives the L-shaped stirring rod 29 to rotate, thereby further improving the mixing and uniform heating of the raw liquid, so that the raw liquid can be better distilled, thereby improving the recovery effect of toluene.

[0017] The cleaning assembly includes an annular slide 10, a belt 14 and a bow frame installed on the front side of the distillation box 2. A fixed shaft is rotatably installed on the inner side of the bow frame. A first pulley 12 is installed on the fixed shaft. A second pulley 15 is installed on the front rotating shaft 33. The first pulley 12 and the second pulley 15 are connected through the belt 14 transmission. A first connecting rod 11 is installed at the front end of the fixed shaft. Two slide grooves 13 are provided on the front side of the distillation box 2. Connecting brackets 9 are installed on both sides of the annular slide 10. A mounting plate 36 is installed on the end side of the bracket 9, and a cleaning brush 35 is installed on the lower surface of the mounting plate 36. Limiting grooves are provided on both sides of the slide groove 13, and limiting plates 8 are installed on both sides of the mounting plate 36. The limiting plates 8 are slidably installed in the limiting grooves, and the mounting plate 36 is slidably installed in the slide groove 13. A sliding column is installed on the outer end side of the first connecting rod 11, and the sliding column is located in the annular slide rail 10. Drainage grooves are opened at the side walls of both ends of the distillation box 2 corresponding to the filter plate 25, and a sealing plate 7 is sealed in the drainage groove. When the rotating shaft 33 rotates, it also drives the second pulley 15 to rotate. Under the action of the first pulley 12, the second pulley 15 and the belt 14, the rotation of the second pulley 15 drives the first pulley 12 to rotate. The rotation of the first pulley 12 drives the fixed shaft to rotate. The rotation of the fixed shaft drives the first connecting rod 11 to rotate. The rotation of the first connecting rod 11 drives the sliding column to move. The movement of the sliding column causes the annular slide rail 10 to reciprocate left and right under the action of the limiting plate 8 and the limiting groove. The reciprocating movement of the annular slide rail 10 drives the mounting plate 36 and the cleaning brush 35 to move, so that the cleaning brush 35 can clean the filter plate 25.

[0018] The driving assembly includes a motor bracket 18 installed on the front side of the distillation box 2, and a motor 19 is installed on the motor bracket 18. The output shaft of the motor 19 is connected to the front end of the front rotating shaft 33 through a coupling, and the input end of the motor 19 is electrically connected to the output end of the external controller. The motor 19 is controlled by the external controller to drive the rotating shaft 33 to rotate, thereby completing the rotation of the rotating shaft 33 by electric power.

[0019] Embodiment three: On the basis of the second embodiment, in this embodiment, the recovery component includes a toluene recovery box 21 installed on the upper surface of the bottom plate 1, the upper surface of the toluene recovery box 21 is connected to the outlet of the condenser 22, the inlet of the condenser 22 is installed with a collecting pipe 20, and the upper surface of the distillation box 2 is installed with a plurality of gas outlet pipes 3, the upper ends of the plurality of gas outlet pipes 3 are connected to a gas collecting ring 4, and the other end of the collecting pipe 20 is connected to the gas collecting ring 4. The evaporated toluene gas passes through the gas outlet pipe 3, the gas collecting ring 4, and the collecting pipe 20 and enters the condenser 22 for condensation, so as to be safely stored in the toluene recovery box 21, so as to improve the safety of recovery.

[0020] The working principle of a toluene safety recovery device for producing toluene isocyanate provided by the present invention is as follows: when recovering toluene, the raw liquid is fed into the distillation box 2 through the feed pipe 5, and the raw liquid is filtered through the filter plate 25 to better collect toluene. The temperature control switch controls the electric heating tube 34 to heat the raw liquid, so that the toluene is volatilized into gas and collected by the recovery component. At the same time, the solution mixing component is started to fully mix the raw liquid so that the raw liquid is heated more evenly, thereby increasing the distillation speed of the raw liquid. The toluene gas after distillation is collected, and the cleaning component can clean the filter plate 25 to improve the filtering effect of the filter plate 25, so that the raw liquid has higher purity and further improves the recovery effect of the toluene gas. In addition, the raw liquid at the bottom passes through the water pump 31 and the circulating liquid pipe 30, and the raw liquid is fed into the liquid collecting box 23 and the branch pipe 24, and is evenly sprinkled on the filter plate 25 through the drainage holes on the branch pipe 24. A rotating shaft 33 is driven by a driving component. The rotation of the rotating shaft 33 drives the first gear 32 to rotate. The rotation of the first gear 32 drives the special-shaped gear and the circulating liquid pipe 30 to rotate. The rotation of the circulating liquid pipe 30 can make the raw liquid discharged from the drainage hole of the branch pipe 24 fall more evenly on the filter plate 25. The rotation of the special-shaped gear drives the other first gears 32 to rotate. The rotation of the first gear 32 drives the second connecting rod 39 to rotate. The rotation of the second connecting rod 39 drives the third connecting rod 40 to move, so that the liquid carrying box 28 can reciprocate in the up and down directions, so that the liquid carrying box 28 carries the raw liquid from the middle and lower part to the upper part. At the same time, the rotation of the circulating liquid pipe 30 drives the L-shaped stirring rod 29 to rotate, thereby further improving the mixing and uniform heating of the raw liquid, so that the raw liquid can be better distilled, thereby improving the recovery effect of toluene. When the rotating shaft 33 rotates, the second pulley 15 is also driven to rotate. Under the action of the first pulley 12, the second pulley 15 and the belt 14, the second pulley 15 rotates to drive the first pulley 12 to rotate. The first pulley 12 rotates to drive the fixed shaft to rotate. The fixed shaft rotates to drive the first connecting rod 11 to rotate. The first connecting rod 11 rotates to drive the sliding column to move. The sliding column movement causes the annular slide rail 10 to reciprocate left and right under the action of the limit plate 8 and the limit groove. The annular slide rail 10 reciprocates left and right to drive the mounting plate 36 and the cleaning brush 35 to move, so that the cleaning brush 35 can clean the filter plate 25. The motor 19 is controlled to work by an external controller, and the motor 19 drives the rotating shaft 33 to rotate, thereby completing the rotation of the rotating shaft 33 by electric power. The evaporated toluene gas enters the condenser 22 through the outlet pipe 3, the gas collecting ring 4, and the collection pipe 20 to condense, so as to be safely stored in the toluene recovery box 21 to improve the safety of recovery.

[0021] It is worth noting that in this embodiment, the core chip of the external controller is an STC single-chip microcomputer, specifically, the model is STC15W204S, the motor 19 and the electric heating tube 34 can be freely configured according to the actual application scenario, and the motor 19 can be a JE series single-phase servo motor produced by Beijing Mitsubishi Electric (China) Co., Ltd. The external controller controls the operation of the motor 19 and the temperature control switch controls the operation of the electric heating tube 34, both of which adopt the commonly used methods in the prior art, and the contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0022] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A toluene safety recovery device for the production of p-tolyl isocyanate, characterized in that: It comprises a base plate (1), a recovery component, a solution mixing component and a cleaning component; A distillation box (2) is mounted on the upper surface of the bottom plate (1), and a recovery component is also mounted on the upper surface of the bottom plate (1), the recovery component is connected to the top of the distillation box (2), a feed pipe (5) is mounted on the upper left side of the distillation box (2), a first control valve (6) is mounted on the feed pipe (5), a discharge pipe (17) is mounted on the front bottom of the distillation box (2), a second control valve (16) is mounted on the discharge pipe (17), a filter plate (25) is mounted in the middle of the interior of the distillation box (2), a plurality of first filter holes (26) are evenly formed on the filter plate (25), a circulating liquid pipe (30) is rotatably mounted in the middle of the filter plate (25), and a water pump (31) is mounted on the bottom surface of the interior of the distillation box (2), the water pump ( The water inlet of the water pump (31) is provided with a liquid inlet pipe, the water outlet of the water pump (31) is rotatably connected to the circulating liquid pipe (30), the upper end of the circulating liquid pipe (30) is connected to a liquid collecting box (23), a plurality of branch pipes (24) are evenly installed on the circumferential outer surface of the liquid collecting box (23), and a plurality of drainage holes are evenly opened on the lower surface of the branch pipe (24), a cleaning component is installed in the middle of the distillation box (2), and the cleaning component is located above the filter plate (25), a plurality of electric heating pipes (34) are evenly installed at the lower part of the distillation box (2), and a solution mixing component is also installed at the lower part of the distillation box (2), and the solution mixing component is located above the electric heating pipe (34), and the input end of the electric heating pipe (34) is electrically connected to the output end of the temperature control switch.

2. A toluene safety recovery device for producing p-tolyl isocyanate according to claim 1, characterized in that: The solution mixing assembly comprises a liquid carrier box (28) and four L-shaped stirring rods (29) uniformly mounted on the outer surface of a circulating liquid pipe (30); a ring plate (37) is commonly mounted at the lower ends of the four L-shaped stirring rods (29); a plurality of tooth blocks (38) are uniformly mounted on the lower surface of the ring plate (37) to form a special-shaped gear; a rotating shaft (33) is rotatably mounted at the middle of the four sides of the inner surface of the distillation box (2); a first gear (32) is mounted on the rotating shaft (33); the first gear (32) is meshedly connected to the special-shaped gear; one end of a second connecting rod (39) is mounted on the inner end of the rotating shaft (33); the first gear (32) is meshedly connected to the special-shaped gear; The other end of the second connecting rod (39) is rotatably mounted with a third connecting rod (40) via a first pin shaft. Fixed pins are mounted at the middle of four sides of the outer surface of the liquid carrier box (28). The third connecting rod (40) is rotatably connected with the corresponding fixed pins. Second filter holes (27) are evenly arranged on the liquid carrier box (28). A through hole is arranged on the liquid carrier box (28). The circulating liquid pipe (30) is passed through the through hole. A driving assembly is mounted on the front side of the distillation box (2). A rotating shaft (33) mounted on the front side of the distillation box (2) protrudes from the outer surface of the distillation box (2). The driving assembly is connected to the outer end of a rotating shaft (33).

3. A toluene safety recovery device for producing p-tolyl isocyanate according to claim 1, characterized in that: The cleaning assembly comprises an annular slide rail (10), a belt (14) and a bow frame installed on the front side of the distillation box (2); a fixed shaft is rotatably installed on the inner side of the bow frame; a first pulley (12) is installed on the fixed shaft; a second pulley (15) is installed on the front rotating shaft (33); the first pulley (12) and the second pulley (15) are connected by a belt (14) transmission; a first connecting rod (11) is installed on the front end of the fixed shaft; two slide grooves (13) are provided on the front side of the distillation box (2); connecting brackets (9) are installed on both sides of the annular slide rail (10); the connecting brackets A mounting plate (36) is installed on the end side of (9), and a cleaning brush (35) is installed on the lower surface of the mounting plate (36). Limiting grooves are provided on both sides of the slide groove (13), and limiting plates (8) are installed on both sides of the mounting plate (36). The limiting plates (8) are slidably installed in the limiting grooves, and the mounting plate (36) is slidably installed in the slide groove (13). A sliding column is installed on the outer end side of the first connecting rod (11), and the sliding column is located in the annular slide rail (10). The side walls of both ends of the distillation box (2) corresponding to the filter plate (25) are provided with drainage grooves, and a sealing plate (7) is sealed in the drainage groove.

4. A toluene safety recovery device for producing p-tolyl isocyanate according to claim 2, characterized in that: The drive assembly comprises a motor bracket (18) mounted on the front side of the distillation box (2), a motor (19) being mounted on the motor bracket (18), an output shaft of the motor (19) being connected to the front end of the front rotating shaft (33) via a coupling, and an input end of the motor (19) being electrically connected to an output end of an external controller.

5. A toluene safety recovery device for producing p-tolyl isocyanate according to claim 1, characterized in that: The recovery component comprises a toluene recovery box (21) installed on the upper surface of the base plate (1); the upper surface of the toluene recovery box (21) is connected to an outlet of a condenser (22); the inlet of the condenser (22) is installed with a collecting pipe (20); a plurality of gas outlet pipes (3) are installed on the upper surface of the distillation box (2); the upper ends of the plurality of gas outlet pipes (3) are connected to a gas collecting ring (4) installed thereon; the other end of the collecting pipe (20) is connected to the gas collecting ring (4).

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