Recrystallization reactor for manufacturing 4-trifluoromethyl nicotinic acid and use method thereof

Abstract

The invention belongs to the field of 4-trifluoromethyl nicotinic acid production, and particularly relates to a recrystallization reactor for 4-trifluoromethyl nicotinic acid manufacturing and a using method thereof.The recrystallization reactor comprises a base, the top of the base is fixedly connected with a refrigerator, and the top of the refrigerator is fixedly connected with a tank; according to the recrystallization reactor for manufacturing 4-trifluoromethyl nicotinic acid and the using method thereof, the top plate is controlled to rotate anticlockwise, so that the sliding shaft and the stirring rod continuously vibrate downwards, crystals adhering to the top are conveniently shaken off, liquid except the crystals can be filtered out through the arranged filter screen, and the crystals can be effectively separated along with continuous downward vibration of the sliding shaft. According to the technical scheme, the material containing box is driven to continuously vibrate downwards, so that redundant liquid in the material containing box can be cleared more quickly, crystals can be prevented from overflowing out of the material containing box and scattering outwards through the downward vibration mode, and different components in the production solvent are uniformly distributed by controlling the top plate to rotate clockwise, enabling the stirring rod to rotate clockwise and stirring the production solvent.

Description

Technical Field

[0001] The present invention belongs to the field of 4-trifluoromethylnicotinic acid production, and specifically relates to a recrystallization reactor for manufacturing 4-trifluoromethylnicotinic acid and its usage method. Background Art

[0002] 4-Trifluoromethylnicotinic acid is usually a white powder, slightly soluble in water, and soluble in some organic solvents such as dichloromethane, methanol, etc. It is an important pharmaceutical intermediate and can be used to synthesize a variety of bioactive compounds and drugs. For example, it is used to prepare some drugs for treating cardiovascular diseases and nervous system diseases, and can also be used as a synthetic raw material for some antibacterial and antiviral drugs. It can be used as an intermediate in organic synthesis to synthesize other fluorine-containing organic compounds, and plays an important role in the research and production of new materials and fine chemical products.

[0003] When manufacturing the crystals of 4-trifluoromethylnicotinic acid, a recrystallization reactor is generally used to crystallize the production solvent. After the production solvent crystallizes, there will still be some liquid inside it. Most of the existing technologies use the pouring method to remove the liquid outside the crystals. However, because the volume of the crystals is very small and they are mixed with the liquid, it is very easy to pour out the crystals together with the liquid during the pouring of the liquid, resulting in waste of the crystals. In addition, when the production solvent cools and condenses, crystals can only be formed on the inner wall of the recrystallization reactor and the stirring rod, resulting in a slow crystal condensation speed. Moreover, the condensed crystals will adhere to the stirring rod and are difficult to take out.

[0004] Therefore, the present invention provides a recrystallization reactor for manufacturing 4-trifluoromethylnicotinic acid and its usage method. Summary of the Invention

[0005] In order to make up for the deficiencies of the existing technology and solve the problems that after the production solvent crystallizes, there will still be some liquid inside it, and most of the existing technologies use the pouring method to remove the liquid outside the crystals. However, because the volume of the crystals is very small and they are mixed with the liquid, it is very easy to pour out the crystals together with the liquid during the pouring of the liquid, resulting in waste of the crystals. In addition, when the production solvent cools and condenses, crystals can only be formed on the inner wall of the recrystallization reactor and the stirring rod, resulting in a slow crystal condensation speed. Moreover, the condensed crystals will adhere to the stirring rod, thus causing the problem of being difficult to take out, the present invention proposes a recrystallization reactor for manufacturing 4-trifluoromethylnicotinic acid and its usage method.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A recrystallization reactor for manufacturing 4-trifluoromethylnicotinic acid according to the present invention includes a base. A refrigerator is fixedly connected to the top of the base. A tank body is fixedly connected to the top of the refrigerator. A support frame is fixedly connected to the top of the base. A first motor is fixedly connected to the inner wall of the support frame. An output end of the first motor is fixedly connected to a lead screw. The lead screw is rotatably connected to the support frame. An outer wall of the lead screw is connected to a slider through a lead screw nut pair. The slider is slidably connected to the support frame. A cover plate is fixedly connected to one side of the slider. A rotating ring is rotatably connected to the bottom of the cover plate. A sliding shaft is slidably connected to the inner wall of the rotating ring. A stirring assembly is arranged on an outer wall of the sliding shaft. A first sliding plate is fixedly connected to the top of the sliding shaft. A fixing ring is fixedly connected to the top of the first sliding plate. A second sliding plate is fixedly connected to the top of the fixing ring. Both the first sliding plate and the second sliding plate are slidably connected to the rotating ring. A driving assembly is arranged on the top of the cover plate.

[0007] Preferably, the driving assembly includes a second motor. The second motor is fixedly installed on the top of the cover plate. An output end of the second motor extends into the fixing ring and is fixedly connected to a top plate. An empty groove is formed in the second sliding plate. Two first top blocks are symmetrically and fixedly connected to the top of the top plate. One side of each of the two first top blocks is beveled. Two second top blocks are symmetrically and fixedly connected to the bottom of the second sliding plate. One side of each of the two second top blocks is beveled. A first spring is sleeved on an outer wall of the output end of the second motor. The top of the first spring is fixedly connected to the cover plate. The bottom of the first spring is fixedly connected to the second sliding plate. A limiting assembly is arranged at the bottom of the cover plate.

[0008] Preferably, the limiting assembly includes a positioning ring. The positioning ring is arranged at the bottom of the cover plate and is rotatably connected to the cover plate. Two clamping blocks are symmetrically and slidably connected to the inner wall of the positioning ring. One side of each of the two clamping blocks is beveled. The other side of the clamping block is fixedly connected to a fifth spring. The fifth spring is fixedly connected to the positioning ring. Two clamping grooves are symmetrically formed in an outer wall of the rotating ring. The clamping blocks are attached to inner walls of the clamping grooves.

[0009] Preferably, the stirring assembly includes a third sliding plate. The third sliding plate is fixedly installed on the outer wall of the sliding shaft. A sleeve is slidably connected to the outer wall of the third sliding plate. A second spring is sleeved on the outer wall of the sliding shaft. The bottom of the second spring is fixedly connected to the third sliding plate. The top of the second spring is fixedly connected to the sleeve. The sliding shaft is slidably connected to the sleeve. A plurality of groups of stirring rods are equidistantly and fixedly connected to the outer wall of the sleeve. A through groove is formed in an inner wall of the stirring rod. The bottom of the inner wall of the through groove is symmetrically beveled. A plurality of brackets are equidistantly and fixedly connected to the inner wall of the through groove.

[0010] Preferably, a material storage box is slidably connected to the inner wall of the tank body. The sliding shaft is rotatably connected to the material storage box, and a filter screen is arranged at the bottom of the material storage box.

[0011] Preferably, a scraper is fixedly connected to the top of the material storage box, and the inner wall of the scraper is arranged as an annular inclined surface.

[0012] Preferably, a plurality of limiting blocks are slidably connected to the inner wall of the tank body at equal intervals above the sleeve. The top and bottom of the limiting block are both arranged as inclined surfaces. A plurality of third springs are fixedly connected to the inside of the tank body at equal intervals. One end of the third spring is fixedly connected to the limiting block. A limiting ring is fixedly connected to one end of the stirring rod, and the limiting ring is used in cooperation with the limiting block.

[0013] Preferably, an installation groove is opened at the top of the tank body. A baffle is slidably connected to the inner wall of the installation groove. The baffle is arranged in a ring shape. A fourth spring is fixedly connected to the bottom of the inner wall of the installation groove. The top of the fourth spring is fixedly connected to the baffle.

[0014] Preferably, a plurality of installation plates are fixedly connected to the inner wall of the tank body at equal intervals. The material storage box and the scraper are both slidably connected to the installation plates.

[0015] A using method of a recrystallization reactor for manufacturing 4-trifluoromethylnicotinic acid. This using method is applicable to the above-mentioned recrystallization reactor for manufacturing 4-trifluoromethylnicotinic acid. The steps of this using method are as follows: S1: Put the production solvent into the tank body, cool the tank body through the cooler to make the production solvent cool and condense into crystals. Start the first motor and control the cover plate to move downward to fit the top of the tank body. S2: Start the second motor to drive the top plate to rotate clockwise, so that the sliding shaft and the stirring rod rotate clockwise to stir the production solvent in the tank body. S3: Control the stirring rod and the material storage box to move upward out of the tank body, and control the top plate to rotate counterclockwise through the second motor to make the stirring rod and the material storage box vibrate continuously downward to clean the crystals attached to the stirring rod and the excess liquid in the material storage box.

[0016] The beneficial effects of the present invention are as follows: 1. A recrystallization reactor for manufacturing 4-trifluoromethylnicotinic acid and its usage method according to the present invention. By controlling the counterclockwise rotation of the top plate, with the cooperation of the first top block and the second top block, the sliding shaft and the stirring rod continuously vibrate downward, facilitating the shaking off of the crystals adhering above. Through the provided filter screen, the liquid other than the crystals can be filtered out. As the sliding shaft continuously vibrates downward, it drives the material-containing box to continuously vibrate downward, thereby facilitating the faster cleaning of the excess liquid in the material-containing box. Moreover, the downward vibration method can prevent the crystals from overflowing the material-containing box and scattering outward. By controlling the clockwise rotation of the top plate, the stirring rod rotates clockwise to stir the production solvent, making the different components in the production solvent evenly distributed.

[0017] 2. A recrystallization reactor for manufacturing 4-trifluoromethylnicotinic acid and its usage method according to the present invention. By the limiting block blocking the upward-moving limiting ring, when the stirring rod and the material-containing box are taken out by moving upward, with the cooperation of the limiting block and the limiting ring, the stirring rod and the support continuously vibrate, thereby facilitating the shaking off of the crystals condensed on the stirring rod and the support. The shaken-off crystals fall into the material-containing box together.

[0018] 3. A recrystallization reactor for manufacturing 4-trifluoromethylnicotinic acid and its usage method according to the present invention. Through the provided through groove, it is convenient to increase the surface area of the stirring rod. Through the provided several supports, it is convenient to increase the crystal attachment points, thereby accelerating the condensation efficiency of the crystals. By arranging several mounting plates on the inner wall of the tank body, the surface area of the inner wall of the tank body is increased, providing more crystal attachment points inside the tank body, facilitating the improvement of the crystal condensation efficiency.

[0019] 4. A recrystallization reactor for manufacturing 4-trifluoromethylnicotinic acid and its usage method according to the present invention. The scraper can scrape off the crystals attached to the inner wall of the tank body and the mounting plates, and the scraped-off crystals slide down along the annular inclined surface of the inner wall of the scraper into the material-containing box. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the drawings.

[0021] Figure 1 is the perspective view of the present invention; Figure 2 is the cross-sectional view of the present invention; Figure 3 is the top cross-sectional view of the cooperation of the clamping block and the clamping groove of the present invention; Figure 4 is the perspective view of the cooperation of the first top block and the second top block of the present invention; Figure 5 is the perspective view of the cooperation of the sleeve and the stirring rod of the present invention; Figure 6 is the perspective view of the cooperation of the material-containing box and the mounting plate of the present invention; Figure 7 is the enlarged view of point A in Figure 2 the present invention; Figure 8 is the enlarged view of point B in Figure 2 the present invention; Figure 9 is the enlarged view of point C in Figure 2 the present invention; Figure 10 is the enlarged view of point D in Figure 5 the present invention.

[0022] In the figure: 1, base; 2, cooler; 3, tank body; 4, support frame; 5, first motor; 6, lead screw; 7, slider; 8, cover plate; 9, swivel ring; 10, sliding shaft; 11, first sliding plate; 12, fixed ring; 13, second sliding plate; 14, second motor; 15, top plate; 16, first top block; 17, second top block; 18, first spring; 19, material storage box; 20, filter screen; 21, scraper; 22, sleeve; 23, third sliding plate; 24, second spring; 25, stirring rod; 26, limiting ring; 27, through groove; 28, bracket; 29, third spring; 30, limiting block; 31, installation groove; 32, fourth spring; 33, baffle; 34, positioning ring; 35, card slot; 36, clamping block; 37, fifth spring; 38, mounting plate. Detailed implementation manners

[0023] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0024] As Figures 1 to 10 shown, the present invention provides a technical solution, a recrystallization reactor for the manufacture of 4-trifluoromethylnicotinic acid, including a base 1, a cooler 2 fixedly connected to the top of the base 1, a tank body 3 fixedly connected to the top of the cooler 2, a support frame 4 fixedly connected to the top of the base 1, a first motor 5 fixedly connected to the inner wall of the support frame 4, a lead screw 6 fixedly connected to the output end of the first motor 5, the lead screw 6 is rotatably connected to the support frame 4, the outer wall of the lead screw 6 is connected to a slider 7 through a lead screw nut pair, the slider 7 is slidably connected to the support frame 4, one side of the slider 7 is fixedly connected to a cover plate 8, the bottom of the cover plate 8 is rotatably connected to a swivel ring 9, the inner wall of the swivel ring 9 is slidably connected to a sliding shaft 10, a stirring assembly is arranged on the outer wall of the sliding shaft 10, the top of the sliding shaft 10 is fixedly connected to a first sliding plate 11, the top of the first sliding plate 11 is fixedly connected to a fixed ring 12, the top of the fixed ring 12 is fixedly connected to a second sliding plate 13, both the first sliding plate 11 and the second sliding plate 13 are slidably connected to the swivel ring 9, and a driving assembly is arranged on the top of the cover plate 8.

[0025] Through the above technical solution, the production solvent is placed into the tank body 3, and the tank body 3 is refrigerated by the refrigerator 2 to cool and condense the production solvent into crystals. The first motor 5 is started to drive the lead screw 6 to rotate, so that the slider 7 moves downward, driving the cover plate 8 to move downward, making the cover plate 8 fit the top of the tank body 3, preventing dust and the like from entering the tank body 3, and preventing the rapid volatilization of the production solvent. At this time, the sliding shaft 10 and the stirring assembly enter the tank body 3, and the driving assembly is used to control the rotation of the sliding shaft 10 to make the stirring assembly rotate, stirring the production solvent to make the different components in the production solvent evenly distributed.

[0026] Specifically, the driving assembly includes a second motor 14. The second motor 14 is fixedly installed on the top of the cover plate 8. The output end of the second motor 14 extends into the interior of the fixed ring 12 and is fixedly connected with a top plate 15. An empty slot is opened inside the second sliding plate 13. Two first top blocks 16 are symmetrically and fixedly connected to the top of the top plate 15. One side of each of the two first top blocks 16 is beveled. Two second top blocks 17 are symmetrically and fixedly connected to the bottom of the second sliding plate 13. One side of each of the two second top blocks 17 is beveled. A first spring 18 is sleeved on the outer wall of the output end of the second motor 14. The top of the first spring 18 is fixedly connected with the cover plate 8, and the bottom of the first spring 18 is fixedly connected with the second sliding plate 13. A limiting assembly is arranged at the bottom of the cover plate 8.

[0027] Through the above technical solution, the second motor 14 is started to drive the top plate 15 to rotate counterclockwise. The rotating ring 9 cannot rotate through the arranged limiting assembly. At this time, as the top plate 15 rotates counterclockwise, the first top block 16 is driven to rotate counterclockwise. When the first top block 16 rotates to the position of the second top block 17, the bevel surface thereof abuts against the bevel surface on one side of the second top block 17. Under the extrusion of the first top block 16, the second top block 17 is pushed upward to drive the second sliding plate 13 to move upward, making the fixed ring 12 move upward, driving the first sliding plate 11 to move upward, making the sliding shaft 10 and the stirring assembly move upward, compressing the first spring 18. When the first top block 16 rotates to a position away from the second top block 17, under the action of the first spring 18 and the self-gravity of the sliding shaft 10, the sliding shaft 10 and the stirring assembly are pushed downward. When the first sliding plate 11 moves downward and hits the bottom of the rotating ring 9, it stops moving and generates vibrations, driving the sliding shaft 10 and the stirring assembly to vibrate. In this way, when the second motor 14 controls the top plate 15 to rotate counterclockwise, the sliding shaft 10 and the stirring assembly continuously vibrate downward, facilitating the vibration and falling off of the crystals adhering to the upper part.

[0028] Specifically, the limiting component includes a positioning ring 34. The positioning ring 34 is arranged at the bottom of the cover plate 8 and is rotatably connected to the cover plate 8. Two clamping blocks 36 are symmetrically and slidably connected to the inner wall of the positioning ring 34. One side of each of the two clamping blocks 36 is provided with an inclined surface. The other side of the clamping block 36 is fixedly connected to a fifth spring 37. The fifth spring 37 is fixedly connected to the positioning ring 34. Two card slots 35 are symmetrically formed on the outer wall of the rotating ring 9. The clamping block 36 fits against the inner wall of the card slot 35.

[0029] Through the above technical solution, when the top plate 15 rotates counterclockwise, under the action of the fifth spring 37, the straight surface on one side of the clamping block 36 presses tightly against the inner wall of the card slot 35, making the card slot 35 unable to rotate counterclockwise, and further making the rotating ring 9 unable to rotate counterclockwise. Thus, when the top plate 15 rotates counterclockwise, the rotating ring 9 is in a fixed state. When it is necessary to stir the production solvent, the top plate 15 is controlled to rotate clockwise by the second motor 14, so that the first top block 16 rotates clockwise. When the first top block 16 rotates to the second top block 17, its straight surface presses tightly against the straight surface on one side of the second top block 17. Under the pushing action of the first top block 16, the second top block 17 is pushed to rotate clockwise, making the second sliding plate 13 rotate clockwise, driving the rotating ring 9 to rotate clockwise. At this time, the card slot 35 presses tightly against the inclined surface on the other side of the clamping block 36. Under the pushing action of the card slot 35, the clamping block 36 moves and compresses the fifth spring 37. After the clamping block 36 moves, it separates from the card slot 35. Losing the limit of the clamping block 36, the rotating ring 9 can continuously rotate clockwise, driving the sliding shaft 10 and the stirring component to rotate clockwise, facilitating the stirring of the production solvent in the tank body 3.

[0030] Specifically, the stirring component includes a third sliding plate 23. The third sliding plate 23 is fixedly installed on the outer wall of the sliding shaft 10. A sleeve 22 is slidably connected to the outer wall of the third sliding plate 23. A second spring 24 is sleeved on the outer wall of the sliding shaft 10. The bottom of the second spring 24 is fixedly connected to the third sliding plate 23. The top of the second spring 24 is fixedly connected to the sleeve 22. The sliding shaft 10 is slidably connected to the sleeve 22. A plurality of groups of stirring rods 25 are equidistantly and fixedly connected to the outer wall of the sleeve 22. A through groove 27 is formed in the inner wall of the stirring rod 25. The bottom of the inner wall of the through groove 27 is provided with symmetric inclined surfaces. A plurality of brackets 28 are equidistantly and fixedly connected to the inner wall of the through groove 27.

[0031] Through the above technical solution, while the sliding shaft 10 rotates, it drives the third sliding plate 23 to rotate, making the sleeve 22 rotate, driving the stirring rods 25 to rotate, and stirring the production solvent in the tank body 3 through the stirring rods 25. As the production solvent cools, crystals gradually condense on the stirring rods 25. Through the provided through groove 27, it is convenient to increase the surface area of the stirring rods 25. Through the provided plurality of brackets 28, it is convenient to increase the attachment points of the crystals, facilitating the acceleration of the crystal condensation efficiency.

[0032] Specifically, a material storage box 19 is slidably connected to the inner wall of the tank body 3. A sliding shaft 10 is rotatably connected to the material storage box 19, and a filter screen 20 is arranged at the bottom of the material storage box 19.

[0033] Through the above technical solution, as the production solvent cools, crystals gradually condense inside the material storage box 19. After the crystallization is completed, through the provided filter screen 20, the liquid other than the crystals can be filtered out. The first motor 5 is started to control the cover plate 8 to move upward, so that the sliding shaft 10 moves upward, driving the material storage box 19 to move upward, and the material storage box 19 is moved out of the tank body 3. At this time, the second motor 14 drives the top plate 15 to rotate counterclockwise, so that the sliding shaft 10 and the material storage box 19 continuously vibrate downward, thereby facilitating the faster cleaning of the excess liquid in the material storage box 19, and the downward vibration method can prevent the crystals from overflowing the material storage box 19 and scattering outward.

[0034] Specifically, a scraper 21 is fixedly connected to the top of the material storage box 19, and the inner wall of the scraper 21 is set as an annular inclined surface.

[0035] Through the above technical solution, as the production solvent cools, crystals gradually condense on the inner wall of the tank body 3. When the material storage box 19 moves upward, it drives the scraper 21 to move upward, and the crystals on the inner wall of the tank body 3 are scraped off by the scraper 21, and the scraped crystals slide down along the annular inclined surface of the inner wall of the scraper 21 into the material storage box 19.

[0036] Specifically, a plurality of limiting blocks 30 are slidably connected to the inner wall of the tank body 3 at equal intervals above the sleeve 22. The top and bottom of the limiting blocks 30 are both set as inclined surfaces. A plurality of third springs 29 are fixedly connected to the inside of the tank body 3 at equal intervals. One end of the third spring 29 is fixedly connected to the limiting block 30. One end of the stirring rod 25 is fixedly connected with a limiting ring 26, and the limiting ring 26 is used in cooperation with the limiting block 30.

[0037] Through the above technical solution, when the sliding shaft 10 moves upward, it drives the stirring rod 25 and the limiting ring 26 to move upward. When the limiting ring 26 moves to the position of the limiting block 30, the inclined surface at the bottom of the limiting block 30 presses against the limiting ring 26, making the limiting ring 26 unable to move upward. At this time, as the sliding shaft 10 continues to move upward, the third sliding plate 23 presses the second spring 24. When the second spring 24 is compressed to the limit, the limiting ring 26 pushes the limiting block 30 to move into the tank body 3, compressing the third spring 29. When the limiting ring 26 moves to a position where it disengages from the limiting block 30, under the action of the second spring 24, the sleeve 22 moves upward. When the bottom of the sleeve 22 hits the third sliding plate 23, vibration occurs. In this way, through the provided plurality of limiting rings 26, the upward moving sleeve 22 continuously vibrates, driving the stirring rod 25 and the bracket 28 to continuously vibrate, thereby facilitating the shaking off of the crystals condensed on the stirring rod 25 and the bracket 28, and the shaken-off crystals all fall into the material storage box 19.

[0038] Specifically, an installation groove 31 is formed at the top of the tank body 3. The inner wall of the installation groove 31 is slidably connected with a baffle 33. The baffle 33 is arranged in a ring shape. The bottom of the inner wall of the installation groove 31 is fixedly connected with a fourth spring 32. The top of the fourth spring 32 is fixedly connected with the baffle 33.

[0039] Through the above technical solution, when the cover plate 8 moves downward, it presses against the top of the baffle 33, pushes the baffle 33 to move downward, compresses the fourth spring 32. Through the reaction force of the fourth spring 32, the baffle 33 fits against the bottom of the cover plate 8, thereby sealing the tank body 3 to prevent dust and the like from entering the tank body 3 and preventing the production solvent from volatilizing rapidly.

[0040] Specifically, a plurality of mounting plates 38 are fixedly connected to the inner wall of the tank body 3 at equal intervals. Both the material holding box 19 and the scraping plate 21 are slidably connected to the mounting plates 38.

[0041] Through the above technical solution, by arranging a plurality of mounting plates 38 on the inner wall of the tank body 3, the surface area of the inner wall of the tank body 3 is increased, providing attachment points for crystallization inside the tank body 3, facilitating the improvement of the condensation speed of crystallization. When the material holding box 19 and the scraping plate 21 move upward, the crystallization attached to the mounting plates 38 can be scraped off, causing the crystallization to enter the material holding box 19.

[0042] A method for using a recrystallization reactor for manufacturing 4-trifluoromethylnicotinic acid, which is applicable to the above-mentioned recrystallization reactor for manufacturing 4-trifluoromethylnicotinic acid. The steps of the method are as follows: S1: Put the production solvent into the tank body 3, cool the tank body 3 through the cooler 2 to make the production solvent cool and condense into crystals, start the first motor 5, and control the cover plate 8 to move downward to fit against the top of the tank body 3; S2: Start the second motor 14 to drive the top plate 15 to rotate clockwise, so that the sliding shaft 10 and the stirring rod 25 rotate clockwise to stir the production solvent in the tank body 3; S3: Control the stirring rod 25 and the material holding box 19 to move upward out of the tank body 3, and control the top plate 15 to rotate counterclockwise through the second motor 14, so that the stirring rod 25 and the material holding box 19 continuously vibrate downward to clean the crystallization attached to the stirring rod 25 and the excess liquid in the material holding box 19.

[0043] During use, the production solvent is placed into the tank body 3. The first motor 5 is started, and the output shaft of the first motor 5 drives the lead screw 6 to rotate, causing the slider 7 to move downward, driving the cover plate 8 to move downward. After the cover plate 8 moves downward, it presses against the top of the baffle plate 33, pushing the baffle plate 33 downward and compressing the fourth spring 32. Through the reaction force of the fourth spring 32, the baffle plate 33 fits against the bottom of the cover plate 8, thereby sealing the tank body 3 to prevent dust and the like from entering the tank body 3 and preventing the rapid volatilization of the production solvent. The tank body 3 is cooled by the cooler 2, causing the production solvent to cool and condense into crystals. The top plate 15 is controlled by the second motor 14 to rotate clockwise, causing the first top block 16 to rotate clockwise. When the first top block 16 rotates to the position of the second top block 17, its straight surface presses against the straight surface on one side of the second top block 17. Under the pushing action of the first top block 16, the second top block 17 is pushed to rotate clockwise, causing the second sliding plate 13 to rotate clockwise, driving the rotating ring 9 to rotate clockwise. At this time, the card slot 35 presses against the inclined surface on the other side of the card block 36. Under the pushing action of the card slot 35, the card block 36 moves and compresses the fifth spring 37. After the card block 36 moves, it separates from the card slot 35, losing the limit of the card block 36, enabling the rotating ring 9 to continue rotating clockwise, driving the sliding shaft 10 to rotate clockwise, causing the third sliding plate 23 to rotate, causing the sleeve 22 to rotate, driving the stirring rod 25 to rotate, and stirring the production solvent in the tank body 3 through the stirring rod 25. As the production solvent cools, crystals gradually condense on the stirring rod 25. Through the provided through groove 27, it is convenient to increase the surface area of the stirring rod 25. Through the provided several brackets 28, it is convenient to increase the attachment points of the crystals, thereby accelerating the condensation efficiency of the crystals, facilitating the stirring of the production solvent in the tank body 3, and making the different components in the production solvent evenly distributed. By arranging several mounting plates 38 on the inner wall of the tank body 3, the surface area of the inner wall of the tank body 3 is increased, providing more attachment points for crystals inside the tank body 3, facilitating the improvement of the condensation efficiency of the crystals. As the production solvent cools, crystals gradually condense inside the material storage box 19. After the crystallization is completed, through the provided filter screen 20, the liquid other than the crystals can be filtered out. As the production solvent cools, crystals gradually condense on the inner wall of the tank body 3. When the material storage box 19 moves upward, it drives the scraper 21 to move upward. The crystals on the inner wall of the tank body 3 are scraped off by the scraper 21, and the scraped crystals slide down along the annular inclined surface of the inner wall of the scraper 21 into the material storage box 19. At the same time, the crystals attached to the mounting plate 38 are scraped off, causing the crystals to enter the material storage box 19. When the sliding shaft 10 moves upward, it drives the stirring rod 25 and the limiting ring 26 to move upward. When the limiting ring 26 moves to the position of the limiting block 30, the inclined surface at the bottom of the limiting block 30 presses against the limiting ring 26, preventing the limiting ring 26 from moving upward. At this time, as the sliding shaft 10 continues to move upward, the third sliding plate 23 compresses the second spring 24. When the second spring 24 is compressed to the limit, the limiting ring 26 pushes the limiting block 30 to move into the tank body 3, compressing the third spring 29. When the limiting ring 26 moves to a position where it disengages from the limiting block 30, under the action of the second spring 24,Move the sleeve 22 upward. When the bottom of the sleeve 22 hits the third slide plate 23, vibrations occur. Thus, through reciprocation, by means of a number of set limiting rings 26, the upward movement of the sleeve 22 is continuously vibrated, driving the stirring rod 25 and the support 28 to vibrate continuously. Thus, it is convenient to shake off the crystals condensed on the stirring rod 25 and the support 28. The shaken-off crystals fall into the material storage box 19 together. When the material storage box 19 is moved out of the tank body 3, start the second motor 14 to drive the top plate 15 to rotate counterclockwise. Under the action of the fifth spring 37, the straight surface on one side of the clamping block 36 abuts tightly against the inner wall of the clamping groove 35, making the clamping groove 35 unable to rotate counterclockwise. Furthermore, the rotating ring 9 cannot rotate counterclockwise. Thus, when the top plate 15 rotates counterclockwise, the rotating ring 9 is in a fixed state. As the top plate 15 rotates counterclockwise, drive the first top block 16 to rotate counterclockwise. When the first top block 16 rotates to the second top block 17, its inclined surface abuts tightly against the inclined surface on one side of the second top block 17. Under the extrusion action of the first top block 16, push the second top block 17 to move upward, driving the second slide plate 13 to move upward, making the fixed ring 12 move upward, driving the first slide plate 11 to move upward, making the sliding shaft 10 and the stirring rod 25 move upward, compressing the first spring 18. When the first top block 16 rotates to a position away from the second top block 17, under the action of the first spring 18 and the self-weight of the sliding shaft 10, push the sliding shaft 10 and the stirring rod 25 to move downward. When the first slide plate 11 moves downward and hits the bottom of the rotating ring 9, it stops moving and generates vibrations, driving the sliding shaft 10 and the stirring rod 25 to vibrate. Thus, through reciprocation, when the second motor 14 controls the top plate 15 to rotate counterclockwise, the sliding shaft 10 and the stirring rod 25 are continuously vibrated downward, which is convenient to shake off the adhered crystals on them. At the same time, as the sliding shaft 10 continuously vibrates downward, drive the material storage box 19 to vibrate downward continuously. Thus, it is convenient to clean the excess liquid in the material storage box 19 faster, and the downward vibration method can prevent the crystals from overflowing the material storage box 19 and scattering outward.,

[0044] The above front, back, left, right, up, and down are all based on the Figure 1 description drawings of the specification. Taking the perspective of the observer as the standard, the side of the device facing the observer is defined as the front, and the left side of the observer is defined as the left, and so on.

[0045] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0046] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A recrystallization reactor for producing 4-trifluoromethylnicotinic acid, characterized in that: The refrigerator comprises a base (1), the top of the base (1) is fixedly connected to a refrigerator (2), the top of the refrigerator (2) is fixedly connected to a tank (3), the top of the base (1) is fixedly connected to a support frame (4), the inner wall of the support frame (4) is fixedly connected to a first motor (5), the output end of the first motor (5) is fixedly connected to a lead screw (6), the lead screw (6) is rotatably connected to the support frame (4), the outer wall of the lead screw (6) is connected to a slider (7) via a lead screw nut pair, the slider (7) is slidably connected to the support frame (4), and one side of the slider (7) is fixedly connected to the support frame (4). A cover plate (8) is fixedly connected thereto; a rotating ring (9) is rotatably connected to the bottom of the cover plate (8); a sliding shaft (10) is slidably connected to the inner wall of the rotating ring (9); a stirring assembly is arranged on the outer wall of the sliding shaft (10); a first sliding plate (11) is fixedly connected to the top of the sliding shaft (10); a fixing ring (12) is fixedly connected to the top of the first sliding plate (11); a second sliding plate (13) is fixedly connected to the top of the fixing ring (12); both the first sliding plate (11) and the second sliding plate (13) are slidably connected to the rotating ring (9); and a driving assembly is arranged on the top of the cover plate (8).

2. A recrystallization reactor for producing 4-trifluoromethylnicotinic acid according to claim 1, characterized in that: The driving assembly comprises a second motor (14), the second motor (14) being fixedly mounted on the top of the cover plate (8), the output end of the second motor (14) extending to the inside of the fixing ring (12) and being fixedly connected to the top plate (15), the inside of the second slide plate (13) being provided with an empty slot, the top of the top plate (15) being symmetrically fixedly connected to two first top blocks (16), one side of the two first top blocks (16) being arranged as an inclined surface, the bottom of the second slide plate (13) being symmetrically fixedly connected to two second top blocks (17), one side of the two second top blocks (17) being arranged as an inclined surface, the outer wall of the output end of the second motor (14) being sleeved with a first spring (18), the top of the first spring (18) being fixedly connected to the cover plate (8), the bottom of the first spring (18) being fixedly connected to the second slide plate (13), and a limit assembly being arranged at the bottom of the cover plate (8).

3. A recrystallization reactor for producing 4-trifluoromethylnicotinic acid according to claim 2, characterized in that: The limiting assembly comprises a positioning ring (34), the positioning ring (34) being arranged at the bottom of the cover plate (8) and being rotatably connected to the cover plate (8), the inner wall of the positioning ring (34) being symmetrically slidably connected to two clamping blocks (36), one side of each of the two clamping blocks (36) being arranged as an inclined surface, the other side of the clamping block (36) being fixedly connected to a fifth spring (37), the fifth spring (37) being fixedly connected to the positioning ring (34), the outer wall of the rotating ring (9) being symmetrically provided with two clamping grooves (35), the clamping blocks (36) being fitted to the inner walls of the clamping grooves (35).

4. A recrystallization reactor for producing 4-trifluoromethylnicotinic acid according to claim 3, characterized in that: The stirring assembly comprises a third slide plate (23), the third slide plate (23) being fixedly mounted on the outer wall of the sliding shaft (10), the outer wall of the third slide plate (23) being slidably connected to a sleeve (22), the outer wall of the sliding shaft (10) being sleeved with a second spring (24), the bottom of the second spring (24) being fixedly connected to the third slide plate (23), the top of the second spring (24) being fixedly connected to the sleeve (22), the sliding shaft (10) being slidably connected to the sleeve (22), the outer wall of the sleeve (22) being equidistantly fixedly connected to a plurality of stirring rods (25), the inner wall of the stirring rod (25) being provided with a through groove (27), the bottom of the inner wall of the through groove (27) being arranged as a symmetrical inclined surface, and the inner wall of the through groove (27) being equidistantly fixedly connected to a plurality of brackets (28).

5. A recrystallization reactor for producing 4-trifluoromethylnicotinic acid according to claim 4, characterized in that: The inner wall of the tank body (3) is slidably connected to a material holding box (19), the sliding shaft (10) is rotatably connected to the material holding box (19), and a filter screen (20) is provided at the bottom of the material holding box (19).

6. A recrystallization reactor for producing 4-trifluoromethylnicotinic acid according to claim 5, characterized in that: A scraper (21) is fixedly connected to the top of the material holding box (19), and the inner wall of the scraper (21) is arranged as an annular inclined surface.

7. A recrystallization reactor for producing 4-trifluoromethylnicotinic acid according to claim 6, characterized in that: A plurality of limit blocks (30) are equidistantly slidably connected to the inner wall of the tank body (3) and located above the sleeve (22); the top and bottom of the limit blocks (30) are both arranged as inclined surfaces; a plurality of third springs (29) are equidistantly fixedly connected to the inside of the tank body (3); one end of the third spring (29) is fixedly connected to the limit block (30); one end of the stirring rod (25) is fixedly connected to a limit ring (26); the limit ring (26) is used in conjunction with the limit block (30).

8. A recrystallization reactor for producing 4-trifluoromethylnicotinic acid according to claim 7, characterized in that: The top of the tank body (3) is provided with a mounting groove (31), the inner wall of the mounting groove (31) is slidably connected to a baffle (33), the baffle (33) is arranged in a ring shape, the bottom of the inner wall of the mounting groove (31) is fixedly connected to a fourth spring (32), and the top of the fourth spring (32) is fixedly connected to the baffle (33).

9. A recrystallization reactor for producing 4-trifluoromethylnicotinic acid according to claim 8, characterized in that: A plurality of mounting plates (38) are fixedly connected to the inner wall of the tank body (3) at equal intervals, and the material containing box (19) and the scraper (21) are both slidably connected to the mounting plates (38).

10. A method for using a recrystallization reactor for producing 4-trifluoromethylnicotinic acid, the method being applicable to the recrystallization reactor for producing 4-trifluoromethylnicotinic acid according to claim 9, characterized in that: The steps for using this method are as follows: S1: placing a production solvent into a tank body (3), cooling the tank body (3) through a refrigerator (2) so that the production solvent is cooled and condensed into crystals, and starting a first motor (5) to control the cover plate (8) to move downward and fit the top of the tank body (3); S2: starting the second motor (14) to drive the top plate (15) to rotate clockwise, causing the sliding shaft (10) and the stirring rod (25) to rotate clockwise to stir the production solvent in the tank body (3); S3: Controlling the stirring rod (25) and the material holding box (19) to move upward out of the tank body (3), and controlling the top plate (15) to rotate counterclockwise via the second motor (14), so that the stirring rod (25) and the material holding box (19) continuously vibrate downward, thereby cleaning the crystals attached to the stirring rod (25) and the excess liquid in the material holding box (19).

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