A kind of o-chlorotoluene rectification equipment and its control method

Abstract

The present application relates to o-chlorotoluene preparation technical field, specifically to a kind of o-chlorotoluene rectification equipment and its using method, including feed tank, mixing tank and rectifying tank, the outside of feed tank is equipped with first temperature control box, the outside of mixing tank is equipped with second temperature control box, feed tank and mixing tank are connected by first conveying pipe between communication.The present application can be monitored by first temperature sensor and second temperature sensor respectively to the temperature in first temperature control box and second temperature control box, when temperature is higher or lower than set range, third water pump and first solenoid valve are opened by controller, so that cooling liquid in cooling water tank enters first temperature control box and is cooled or heating pipe is arranged in second temperature control box and is heated, without additional temperature control equipment, through reboiler and cooling water tank, energy is recycled, so that raw material is added in more suitable temperature, improve rectification effect, reduce cost.

Description

TECHNICAL FIELD

[0001] The present application relates to a rectification device, in particular to an o-chlorotoluene rectification device and a control method thereof, and belongs to the technical field of o-chlorotoluene preparation. BACKGROUND

[0002] O-chlorotoluene is an organic compound, which is a colorless transparent liquid, and is mainly used as a dye, a medicine, an intermediate for organic synthesis, and a solvent for rubber and synthetic resin. Through a diazotization reaction by adding hydrochloric acid and sodium nitrite to o-toluidine as a raw material, and then adding cuprous chloride for reaction, o-chlorotoluene is prepared through rectification, drying and other processes. However, during the preparation process, when adding raw materials such as sodium nitrite solution or cuprous chloride solution, the temperature requirement is also relatively strict, and the temperature needs to be controlled within a certain range to make the purity and efficiency of o-chlorotoluene obtained during rectification higher. At present, when adding raw materials before rectification, the temperature of the raw materials is generally monitored by external heating or cooling monitoring equipment. This not only requires additional temperature control equipment, increasing the cost, but also requires manual operation of the temperature control equipment to cool or heat the raw materials when the temperature is higher or lower than the set value, which is inconvenient to use.

[0003] Therefore, it is necessary to improve the o-chlorotoluene rectification device to solve the above problems. SUMMARY

[0004] The purpose of the present application is to provide an o-chlorotoluene rectification device, which can monitor the temperature in the first temperature control box and the second temperature control box through the first temperature sensor and the second temperature sensor respectively. When the temperature is higher or lower than the set range, the controller opens the third water pump and the first electromagnetic valve to make the cooling liquid in the cooling water tank enter the first temperature control box for cooling or make the heating pipe discharge hot steam into the second temperature control box for heating. No additional temperature control equipment is needed. Through the reuse of energy by the reboiler and the cooling water tank, the raw material addition is carried out at a more suitable temperature, improving the rectification effect and reducing the cost.

[0005] In order to achieve the above object, the main technical scheme adopted by the present application comprises: a kind of o-chlorotoluene rectification equipment, including feeding tank, mixing tank and rectification tank, the outer side of the feeding tank is equipped with first temperature control box, the outer side of the mixing tank is equipped with second temperature control box, the feeding tank is connected with the mixing tank by first conveying pipe, the mixing tank is connected with the rectification tank by second conveying pipe, and first water pump and second water pump are respectively arranged on the first conveying pipe and the second conveying pipe, the lower end of the rectification tank is equipped with reboiler, the output end of the reboiler is connected with the rectification tank by heating pipe, the internal upper end of the rectification tank is fixedly connected with exhaust plate, the upper end of the exhaust plate is equipped with scraping assembly for cleaning water droplets adhered to the inner wall of rectification tank, the upper portion of the rectification tank is connected with cooling pipe, the other end of the cooling pipe is connected with cooling water tank, the end of the cooling water tank away from the cooling pipe is connected with discharge pipe, the other end of the discharge pipe is connected with discharge tank, the inside of the cooling water tank is equipped with condenser pipe, the two ends of the condenser pipe are connected with the cooling pipe and the discharge pipe respectively, the discharge tank is connected with the rectification tank by reflux pipe.

[0006] The heating pipe and the second temperature control box are connected with heating pipe, the first temperature control box and the cooling water tank are connected with cooling pipe, and the inner walls of the first temperature control box and the second temperature control box are respectively provided with first temperature sensor and second temperature sensor, the cooling pipe is provided with third water pump, the heating pipe is provided with first electromagnetic valve, the outer wall of the first temperature control box is provided with controller, and the first temperature sensor, second temperature sensor, first electromagnetic valve and third water pump are electrically connected with the controller.

[0007] Preferably, the scraping assembly comprises rotating rod on the upper end of the exhaust plate, first bevel gear fixedly connected to the two ends of the rotating rod, a plurality of blades on the outer rod wall of the rotating rod and arc-shaped scraping ring in contact with the inner wall of the rectification tank, a connecting groove is formed in the inner wall of the rectification tank, a rotating rod is rotatably connected in the connecting groove, a second bevel gear is arranged on the lower end of the rotating rod and engaged with the first bevel gear, a lifting block is threadedly connected to the upper end of the rotating rod, and the lifting block is slidingly connected with the connecting groove, and the arc-shaped scraping ring is fixedly connected to the upper end of the lifting block.

[0008] Preferably, two fixed rods are arranged on the inner wall of the rectification tank, and the two ends of the rotating rod penetrate through the two fixed rods and are rotatably connected with the two fixed rods.

[0009] Preferably, a limiting block is fixedly connected to the inner wall of the connecting groove, and the limiting block is located above the first bevel gear.

[0010] Preferably, a geared motor is provided on the lower end face of the second temperature control box, the output end of the geared motor is connected to a rotating shaft, a stirring rod is provided on the outer wall of the rotating shaft, the rotating shaft extends into the interior of the mixing box and is sealed and movably connected to the mixing box and the second temperature control box, and a vent hole is provided on the upper end face of the second temperature control box.

[0011] Preferably, the return pipe is provided with a second solenoid valve electrically connected to the controller, and a discharge pipe is connected to one side of the discharge box.

[0012] Preferably, the upper end of the cooling water tank is connected to a liquid filling pipe, and the lower end of the cooling water tank is provided with a semiconductor refrigeration chip.

[0013] Preferably, a movable column is rotatably connected to the bottom of the exhaust plate, and a rotating gear is fixedly connected to the bottom of the movable column. Two opposing toothed plates mesh with the outer edge of the rotating gear. A sliding strip is slidably connected to the other side of the toothed plate. The sliding strip is fixedly connected to the lower end face of the exhaust plate. An electric telescopic rod is provided on the inner wall of the distillation tank. The output end of the electric telescopic rod is connected to one of the toothed plates. Two sets of air blowing holes are provided on the exhaust plate, and the two sets of air blowing holes are staggered. Multiple leakage holes are provided on the exhaust plate.

[0014] Preferably, the upper end of the mixing box is connected to a packing pipe extending to the outside of the second temperature control box, the upper end of the feeding box is connected to a feeding pipe extending to the outside of the first temperature control box, and a drain pipe is connected to one side of the first temperature control box, with a drain valve on the drain pipe.

[0015] A control method for an o-chlorotoluene distillation apparatus includes the following steps:

[0016] S1: First, hydrochloric acid and sodium nitrite are added to the feeding tank. The temperature in the first temperature control box is monitored by the first temperature sensor to see if it is within the set range. If the temperature is too high, the third water pump is turned on by the controller to transport the coolant in the cooling water tank to the first temperature control box for cooling. The raw materials after reaction in the feeding tank enter the mixing tank and cuprous chloride solution is added through the packing tube.

[0017] S2: Then the temperature inside the second temperature control chamber is monitored by the second temperature sensor. If the temperature is lower than the set value, the first solenoid valve is opened by the controller to allow the hot steam in the heating tube to enter the second temperature control chamber. Then the raw materials in the mixing chamber are stirred and mixed by the stirring rod driven by the geared motor.

[0018] S3: The raw materials in the final mixing tank are transported to the distillation tank by the second water pump for heating and distillation into a gaseous state. After being condensed and liquefied in the cooling water tank, they enter the discharge tank. The chemical raw liquid in the discharge tank can be re-entered into the distillation tank for secondary distillation when the second solenoid valve is opened.

[0019] The present invention has at least the following beneficial effects:

[0020] 1. The temperature inside the first and second temperature control boxes is monitored by the first and second temperature sensors, respectively. When the temperature is higher or lower than the set range, the controller opens the third water pump and the first solenoid valve, allowing the coolant in the cooling water tank to enter the first temperature control box for cooling or allowing the heating tube to discharge hot steam into the second temperature control box for heating. No additional temperature control equipment is required. Energy is reused through the reboiler and cooling water tank, so that the raw material is added at a more suitable temperature, thus improving the distillation effect. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is a three-dimensional structural schematic diagram provided for the present invention;

[0023] Figure 2 This is a cross-sectional schematic diagram provided for the present invention;

[0024] Figure 3 Provided by the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0025] Figure 4 This is a schematic diagram of the structure below the exhaust plate provided by the present invention;

[0026] Figure 5 A three-dimensional structural diagram of the exhaust plate provided by the present invention;

[0027] Figure 6 This is a schematic diagram of the scraping component structure provided by the present invention;

[0028] Figure 7 A flowchart of the control method for the o-chlorotoluene distillation equipment provided by the present invention.

[0029] In the diagram, 1. Feeding box; 101. First temperature control box; 102. First conveying pipe; 103. Second conveying pipe; 104. First water pump; 105. First temperature sensor; 106. Feeding pipe; 107. Drain pipe; 108. Drain valve; 2. Mixing box; 201. Second temperature control box; 202. Second water pump; 203. Second temperature sensor; 204. Packing tube; 3. Distillation tank; 301. Reboiler; 302. Exhaust plate; 303. Cooling pipe; 304. Cooling water tank; 305. First solenoid valve; 306. Controller; 307. Heating pipe; 4. Scraping assembly; 401. Discharge box; 402. Condenser; 403. Reflux pipe; 404. 405. Rotating rod; 406. First bevel gear; 407. Blade; 408. Arc-shaped scraper ring; 409. Connecting groove; 410. Rotating rod; 411. Second bevel gear; 412. Lifting block; 413. Discharge pipe; 5. Heating pipe; 501. Cooling pipe; 502. Third water pump; 6. Fixed rod; 601. Limiting block; 7. Gear motor; 701. Rotating shaft; 702. Stirring rod; 703. Vent hole; 8. Second solenoid valve; 801. Discharge pipe; 802. Liquid filling pipe; 803. Semiconductor refrigeration chip; 9. Movable column; 901. Rotating gear; 902. Tooth plate; 903. Sliding bar; 904. Electric telescopic rod; 905. Air blowing hole; 906. Liquid leakage hole. Detailed Implementation

[0030] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0031] like Figures 1-7As shown, the o-chlorotoluene distillation apparatus provided in this embodiment includes a feeding tank 1, a mixing tank 2, and a distillation tank 3. A first temperature control box 101 is fitted around the outside of the feeding tank 1, and a second temperature control box 201 is fitted around the outside of the mixing tank 2. The feeding tank 1 and the mixing tank 2 are connected by a first conveying pipe 102, and the mixing tank 2 and the distillation tank 3 are connected by a second conveying pipe 103. A first water pump 104 and a second water pump 202 are respectively installed on the first conveying pipe 102 and the second conveying pipe 103. A packing pipe 204 extending to the outside of the second temperature control box 201 is connected to the upper end of the mixing tank 2. The packing pipe 204 is used to add cuprous chloride raw material to the mixing tank 2 for mixing. The mixing temperature is 15-25°C. A feeding pipe 106 extending to the outside of the first temperature control box 101 is connected to the upper end of the feeding tank 1. This is used to add hydrochloric acid and sodium nitrite raw materials to the feeding tank 1, and react them at 0-5℃ to obtain diazonium salt. The lower end of the distillation tank 3 is equipped with a reboiler 301. The output end of the reboiler 301 is connected to the distillation tank 3 through a heating pipe 307, which is used to supply heating steam to the distillation tank 3. The upper part of the distillation tank 3 is connected to a cooling pipe 303. The other end of the cooling pipe 303 is connected to a cooling water tank 304. The chemical raw materials after heating and distillation into a gaseous state enter the cooling water tank 304 for liquefaction. The end of the cooling water tank 304 away from the cooling pipe 303 is connected to a discharge pipe 412. The other end of the discharge pipe 412 is connected to a discharge box 401. The interior of the cooling water tank 304 is equipped with a condenser 402. The two ends of the condenser 402 are connected to the cooling pipe 303 and the discharge pipe 412 respectively. The liquefied liquid enters the discharge box 401.

[0032] A heating pipe 5 is connected between the heating tube 307 and the second temperature control box 201. The heating pipe 5 is used to transport the hot steam in the heating tube 307 to the second temperature control box 201 for heating. A cooling pipe 501 is connected between the first temperature control box 101 and the cooling water tank 304. The cooling pipe 501 is used to transport the coolant in the cooling water tank 304 to the first temperature control box 101 for cooling. A first temperature sensor 105 and a second temperature sensor 203 (both model T) are respectively installed on the inner walls of the first temperature control box 101 and the second temperature control box 201. The MP37FT9Z cooling tube 501 is equipped with a third water pump 502, the heating tube 307 is equipped with a first solenoid valve 305, and the outer wall of the first temperature control box 101 is equipped with a controller 306 (model MAM-200). The first temperature sensor 105 and the second temperature sensor 203 can transmit temperature signals to the controller 306. The controller 306 opens the first solenoid valve and the third water pump 502 to perform heating and cooling processes. The first temperature sensor 105, the second temperature sensor 203, the first solenoid valve 305 and the third water pump 502 are all electrically connected to the controller 306.

[0033] The second temperature control box 201 has a vent hole 703 on its upper surface. High-temperature steam enters the second temperature control box 201, and some of the steam flows out through the vent hole 703 to reduce the pressure inside the second temperature control box 201. A drain pipe 107 is connected to one side of the first temperature control box 101. A drain valve 108 is provided on the drain pipe 107. The drain valve 108 is used to drain the coolant inside the first temperature control box 101.

[0034] Furthermore, such as Figure 1 as well as Figure 2 As shown, the discharge box 401 and the distillation tank 3 are connected by a reflux pipe 403. The reflux pipe 403 is equipped with a second solenoid valve 8 that is electrically connected to the controller 306. Opening the second solenoid valve 8 can discharge the raw liquid in the discharge box 401 back into the distillation tank 3 for secondary distillation. A discharge pipe 801 is connected to one side of the discharge box 401. Closing the second solenoid valve 8 can discharge the distilled chemical raw liquid through the discharge pipe 801.

[0035] Furthermore, such as Figure 2 As shown, a geared motor 7 is provided on the lower end face of the second temperature control box 201. The output end of the geared motor 7 is connected to a rotating shaft 701. A stirring rod 702 is provided on the outer wall of the rotating shaft 701. The rotating shaft 701 extends into the interior of the mixing box 2 and is sealed and movably connected to the mixing box 2 and the second temperature control box 201. By rotating the stirring rod 702, the cuprous chloride solution and the toluidine diazonium salt solution in the mixing box 2 can be stirred and mixed, so that the reaction is more thorough.

[0036] Furthermore, such as Figure 1 as well as Figure 2 As shown, a liquid filling pipe 802 is connected to the upper end of the cooling water tank 304, and a semiconductor cooling chip 803 is provided at the lower end of the cooling water tank 304 for cooling the coolant in the cooling water tank 304.

[0037] The distillation tank 3 has an exhaust plate 302 fixedly connected to its upper interior. The upper end of the exhaust plate 302 is equipped with a scraping assembly 4 for cleaning water droplets adhering to the inner wall of the distillation tank 3. The scraping assembly 4 includes a rotating rod 404 located at the upper end of the exhaust plate 302, a first bevel gear 405 fixedly connected to both ends of the rotating rod 404, multiple blades 406 located on the outer wall of the middle section of the rotating rod 404, and an arc-shaped scraper ring 407 in contact with the inner wall of the distillation tank 3. A connecting groove 408 is formed on the inner wall of the distillation tank 3. A rotating rod 409 is rotatably connected inside the connecting groove 408. The lower end of the rotating rod 409 is equipped with a second bevel gear that meshes with the first bevel gear 405. 410. The upper end of the rotating rod 409 is threadedly connected to a lifting block 411, and the lifting block 411 is slidably connected to the connecting groove 408. The arc-shaped scraper ring 407 is fixedly connected to the upper end of the lifting block 411. When the reboiler 301 discharges hot steam into the distillation tank 3 through the heating pipe 307, the hot steam blows the blades 406, causing the blades 406 to drive the rotating rod 404 to rotate, which in turn drives the two first bevel gears 405 to rotate, and causes the second bevel gear 410 meshing with it to drive the rotating rod 409 to rotate, thereby driving the lifting block 411 to move, and causing the arc-shaped scraper ring 407 to move to scrape off the water droplets attached to the inner wall of the distillation tank 3, accelerating the water droplet dripping time and improving the distillation effect.

[0038] Furthermore, such as Figure 6 As shown, the inner wall of the distillation tank 3 is provided with two fixed rods 6, and the two ends of the rotating rod 404 pass through the two fixed rods 6 respectively and are rotatably connected to the two fixed rods 6, which is used to support the rotating rod 404;

[0039] Furthermore, such as Figure 4 as well as Figure 5 As shown, a movable column 9 is rotatably connected to the bottom of the exhaust plate 302, and a rotating gear 901 is fixedly connected to the bottom of the movable column 9. Two opposing toothed plates 902 mesh with the outer edge of the rotating gear 901. A sliding strip 903 is slidably connected to the other side of the toothed plate 902. The sliding strip 903 is fixedly connected to the lower end face of the exhaust plate 302. An electric telescopic rod 904 is provided on the inner wall of the distillation tank 3. The output end of the electric telescopic rod 904 is connected to one of the toothed plates 902. Two sets of air blowing holes 905 are provided on the exhaust plate 302, and the two sets of air blowing holes 905 are staggered. When the electric telescopic rod 904 moves and drives the toothed plate 902 to slide, the other toothed plate 902 can be driven to move in the opposite direction under the action of the rotating gear 901, thereby blocking one set of air blowing holes 905 and allowing steam to be blown to the blade 406 through the other set of air blowing holes 905 to control the forward and reverse rotation of the blade 406, thereby driving the arc-shaped scraper ring 407 to move up and down.

[0040] Furthermore, the exhaust plate 302 is provided with multiple drainage holes 906. Water droplets scraped off by the arc-shaped scraper ring 407 seep into the lower end of the exhaust plate 302 through the drainage holes 906, thus preventing liquid accumulation on the exhaust plate 302.

[0041] like Figures 1-7 As shown, the control method for the o-chlorotoluene distillation equipment provided in this embodiment includes the following steps:

[0042] S1: First, hydrochloric acid and sodium nitrite are added to the feeding tank 1. The temperature in the first temperature control box 101 is monitored by the first temperature sensor 105 to see if it is within the set range. If the temperature is too high, the third water pump 502 is turned on by the controller 306 to transport the coolant in the cooling water tank 304 to the first temperature control box 101 for cooling. The raw materials after reaction in the feeding tank 1 enter the mixing tank 2 and cuprous chloride solution is added through the packing tube 204.

[0043] S2: Then the temperature inside the second temperature control box is monitored by the second temperature sensor 203. If the temperature is lower than the set value, the first solenoid valve 305 is opened by the controller 306 to allow the hot steam in the heating tube 307 to enter the second temperature control box 201. Then the stirring rod 702 is driven by the reduction motor 7 to stir and mix the raw materials in the mixing box 2.

[0044] S3: The raw material in the final mixing tank 2 is transported to the distillation tank 3 by the second water pump 202 for heating and distillation into a gaseous state. After entering the cooling water tank 304, it is condensed and liquefied and then enters the discharge tank 401. When the second solenoid valve 8 is opened, the chemical raw liquid in the discharge tank 401 can re-enter the distillation tank 3 for secondary distillation.

[0045] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0046] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes that element.

[0047] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A distillation apparatus for o-chlorotoluene, comprising a feeding tank (1), a mixing tank (2), and a distillation vessel (3), characterized in that: The feeding box (1) is fitted with a first temperature control box (101) on its outer side, and the mixing box (2) is fitted with a second temperature control box (201) on its outer side. The feeding box (1) and the mixing box (2) are connected by a first conveying pipe (102), and the mixing box (2) and the distillation tank (3) are connected by a second conveying pipe (103). A first water pump (104) and a second water pump (202) are respectively installed on the first conveying pipe (102) and the second conveying pipe (103). A reboiler (301) is installed at the lower end of the distillation tank (3). The output end of the reboiler (301) is connected to the distillation tank (3) through a heating pipe (307). An exhaust plate (302) is fixedly connected to the upper part of the interior of the distillation tank (3). The upper end of the gas plate (302) is provided with a scraping component (4) for cleaning water droplets adhering to the inner wall of the distillation tank (3). A cooling pipe (303) is connected to the top of the distillation tank (3). The other end of the cooling pipe (303) is connected to a cooling water tank (304). The end of the cooling water tank (304) away from the cooling pipe (303) is connected to a discharge pipe (412). The other end of the discharge pipe (412) is connected to a discharge box (401). A condenser (402) is provided inside the cooling water tank (304). The two ends of the condenser (402) are connected to the cooling pipe (303) and the discharge pipe (412) respectively. The discharge box (401) is connected to the distillation tank (3) through a reflux pipe (403). A heating pipe (5) is connected between the heating tube (307) and the second temperature control box (201), and a cooling pipe (501) is connected between the first temperature control box (101) and the cooling water tank (304). A first temperature sensor (105) and a second temperature sensor (203) are respectively installed on the inner walls of the first temperature control box (101) and the second temperature control box (201). A third water pump (502) is installed on the cooling pipe (501), and a first... The electromagnetic valve (305), the controller (306) is provided on the outer wall of the first temperature control box (101), the first temperature sensor (105), the second temperature sensor (203), the first electromagnetic valve (305) and the third water pump (502) are all electrically connected to the controller (306), the scraping assembly (4) includes a rotating rod (404) provided on the upper end of the exhaust plate (302), a first bevel gear (405) fixedly connected to both ends of the rotating rod (404), and a rotating rod (405) provided on the upper end of the exhaust plate (302). 4) Multiple blades (406) on the outer wall of the middle section and an arc-shaped scraper ring (407) in contact with the inner wall of the distillation tank (3). A connecting groove (408) is provided on the inner wall of the distillation tank (3). A rotating rod (409) is rotatably connected inside the connecting groove (408). A second bevel gear (410) is provided at the lower end of the rotating rod (409) and meshes with the first bevel gear (405). A lifting block (411) is threadedly connected to the upper end of the rotating rod (409), and the lifting block ( 411) is slidably connected to the connecting groove (408), the arc-shaped scraper ring (407) is fixedly connected to the upper end of the lifting block (411), two fixed rods (6) are provided on the inner wall of the distillation tank (3), the two ends of the rotating rod (404) pass through the two fixed rods (6) respectively and are rotatably connected to the two fixed rods (6), and a limiting block (601) is fixedly connected to the inner wall of the connecting groove (408), the limiting block (601) is located above the first bevel gear (405); The bottom of the exhaust plate (302) is rotatably connected to a movable column (9), and the bottom of the movable column (9) is fixedly connected to a rotating gear (901). The outer edge of the rotating gear (901) meshes with two opposing toothed plates (902). A sliding strip (903) is slidably connected to the other side of the toothed plate (902). The sliding strip (903) is fixedly connected to the lower end face of the exhaust plate (302). An electric telescopic rod (904) is provided on the inner wall of the distillation tank (3). The output end of the electric telescopic rod (904) is connected to one of the toothed plates (902). The exhaust plate (302) is provided with two sets of air blowing holes (905), and the two sets of air blowing holes (905) are staggered. The exhaust plate (302) is provided with multiple leakage holes (906). When the electric telescopic rod (904) moves and drives the toothed plate (902) to slide, the rotating gear (901) can drive the other toothed plate (902) to move in the opposite direction, thereby blocking one set of air blowing holes (905) and allowing steam to be blown to the blade (406) through the other set of air blowing holes (905), thereby controlling the forward and reverse rotation of the blade (406), thereby driving the arc-shaped scraper ring (407) to move up and down.

2. The o-chlorotoluene distillation apparatus according to claim 1, characterized in that: The second temperature control box (201) is provided with a geared motor (7) on its lower end surface. The output end of the geared motor (7) is connected to a rotating shaft (701). A stirring rod (702) is provided on the outer wall of the rotating shaft (701). The rotating shaft (701) extends into the interior of the mixing box (2) and is sealed and movablely connected to the mixing box (2) and the second temperature control box (201). A vent hole (703) is provided on the upper end surface of the second temperature control box (201).

3. The o-chlorotoluene distillation apparatus according to claim 2, characterized in that: The return pipe (403) is provided with a second solenoid valve (8) electrically connected to the controller (306), and a discharge pipe (801) is connected to one side of the discharge box (401).

4. The o-chlorotoluene distillation apparatus according to claim 3, characterized in that: The upper end of the cooling water tank (304) is connected to a liquid filling pipe (802), and the lower end of the cooling water tank (304) is provided with a semiconductor cooling chip (803).

5. The o-chlorotoluene distillation apparatus according to claim 4, characterized in that: The upper end of the mixing box (2) is connected to a packing pipe (204) extending to the outside of the second temperature control box (201), the upper end of the feeding box (1) is connected to a feeding pipe (106) extending to the outside of the first temperature control box (101), a drain pipe (107) is connected to one side of the first temperature control box (101), and a drain valve (108) is provided on the drain pipe (107).

6. A control method for an o-chlorotoluene distillation apparatus as described in claim 5, characterized in that: Includes the following steps: S1: First, add hydrochloric acid and sodium nitrite raw materials into the feeding tank (1). The temperature in the first temperature control box (101) is monitored by the first temperature sensor (105) to see if it is within the set range. If the temperature is too high, the third water pump (502) is turned on by the controller (306) to transport the coolant in the cooling water tank (304) to the first temperature control box (101) for cooling. The raw materials after reaction in the feeding tank (1) enter the mixing tank (2) and cuprous chloride solution is added through the packing tube (204). S2: Then the temperature in the second temperature control box is monitored by the second temperature sensor (203). If the temperature is lower than the set value, the first solenoid valve (305) is opened by the controller (306) so that the hot steam in the heating tube (307) enters the second temperature control box (201). Then the raw materials in the mixing box (2) are stirred and mixed by the stirring rod (702) driven by the geared motor (7). S3: The raw material in the final mixing tank (2) is transported to the distillation tank (3) by the second water pump (202) for heating and distillation into gaseous state. After entering the cooling water tank (304) and being condensed and liquefied, it enters the discharge tank (401). When the second solenoid valve (8) is opened, the chemical raw liquid in the discharge tank (401) can re-enter the distillation tank (3) for secondary distillation.

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