Crystallization kettle for producing m-toluic acid

Abstract

The invention belongs to the field of crystallization kettle equipment, and particularly relates to a crystallization kettle for producing m-toluic acid, which comprises a crystallization outer tank body device, the crystallization outer tank body device comprises a crystallization outer tank body, the upper end of the crystallization outer tank body is connected with an upper cover device, and the lower end of the crystallization outer tank body is fixedly connected with a lower conical tank; a circular filter plate is arranged at the joint of the outer crystallization tank body and the lower conical tank, an annular cooling cavity is formed in the outer wall of the outer crystallization tank body, disturbance devices arranged circumferentially are arranged in the annular cooling cavity, a first driving motor and a second driving motor are arranged on the upper cover device, and an inner crystallization tank body device is arranged in the outer crystallization tank body. A conveying auger device which is coaxial with the crystallization inner tank body device is arranged in the crystallization inner tank body device, the upper end of the conveying auger device is in transmission connection with a first driving motor, a stirring device is rotationally connected in the lower conical tank, and a discharging device is arranged on the lower conical tank. The m-toluic acid thermal saturated solution can be uniformly cooled, and the crystallization efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of crystallization kettle equipment, and in particular relates to a crystallization kettle for producing m-toluic acid. Background Art

[0002] Methylbenzoic acid is an organic compound in the form of white or light yellow crystalline powder with multiple isomers, the most common of which are p-methylbenzoic acid and m-methylbenzoic acid. It is widely used in the production of organic substances such as medicines, photosensitive materials, pesticides, pigments, and fragrances. In the production process of m-methylbenzoic acid, it needs to be purified and crystallized in a crystallization kettle, that is, after the hot saturated solution of m-methylbenzoic acid is cooled, the m-methylbenzoic acid solute is precipitated in the form of crystals.

[0003] For example, a Chinese patent with application number CN202223257697.X discloses a crystallization kettle for producing raw materials, including a crystallization kettle, a feed pipe fixed on the crystallization kettle, a stirring mechanism on the crystallization kettle, a discharge pipe fixed at the bottom of the crystallization kettle, an anti-blocking mechanism on the discharge pipe, a cooling component in the crystallization kettle, a cleaning component in the crystallization kettle, a mounting box fixed at the bottom of the crystallization kettle, the discharge pipe is located in the mounting box, and the anti-blocking mechanism includes a first motor, a first rotating shaft, a driving sprocket, and a second rotating shaft. Like most existing cooling crystallization kettles, the cooling component is wrapped on the outer wall of the crystallization kettle, and the heat exchange between the inside and outside is carried out through the cooling component, which leads to a large temperature difference between the saturated solution near the central axis of the crystallization kettle and the saturated solution near the inner wall of the crystallization kettle, and the stirring mechanism can only disturb the overall rotation of the saturated solution in the crystallization kettle, and cannot quickly eliminate this error, so that the cooling of the hot saturated solution of m-toluic acid is insufficient, the crystallization is uneven, and the crystallization efficiency is affected. Summary of the invention

[0004] The purpose of the present invention is to provide a crystallization kettle for the production of m-toluic acid in view of the shortcomings of the prior art. Through a novel feeding device, a hot saturated solution of m-toluic acid can be evenly cooled to improve the crystallization efficiency, thereby effectively solving the problems existing in the prior art.

[0005] To achieve the above purpose, the specific technical solutions of the present invention are as follows: A crystallization kettle for producing m-methylbenzoic acid comprises a crystallization outer tank body device, wherein the crystallization outer tank body device comprises a crystallization outer tank body, an upper cover device is connected to the upper end of the crystallization outer tank body, a lower conical tank is fixedly connected to the lower end of the crystallization outer tank body, a circular filter plate is provided at the connection between the crystallization outer tank body and the lower conical tank, an annular cooling cavity is provided on the outer wall of the crystallization outer tank body, a circumferentially arranged disturbance device is provided in the annular cooling cavity, a first driving motor and a second driving motor are provided on the upper cover device, a crystallization inner tank body device with the same central axis is provided in the crystallization outer tank body, the upper end of the crystallization inner tank body device is rotatably connected to the center of the upper cover device, the crystallization inner tank body device is transmission-connected to the second driving motor, a conveying auger device with the same central axis is provided in the crystallization inner tank body device, the upper end of the conveying auger device is transmission-connected to the first driving motor, a stirring device is rotatably connected in the lower conical tank, and a discharging device is provided on the lower conical tank.

[0006] As a further arrangement of the above scheme, a symmetrical circulating water device is provided on the outer wall of the annular cooling chamber, and the circulating water device can circulate and transport cooling water in the annular cooling chamber. Filter holes are opened on the circular filter plate, and a rotating table is provided at the center of the upper end surface of the circular filter plate. The outer edge of the circular filter plate is provided with circumferentially distributed connecting blocks, and the circular filter plate is fixedly connected to the inner wall of the crystallization outer tank body through the connecting blocks. A sealing ring concentric with the circular filter plate is provided on the inner side of the upper end of the connecting block, a mounting ring is provided on the outer side of the lower end of the crystallization outer tank body, and a mounting groove is provided at the lower end of the lower conical tank.

[0007] As a further arrangement of the above scheme, the upper cover device includes an upper cover, a mounting bracket is provided at the center of the upper end surface of the upper cover, the mounting bracket is used to install the first drive motor, a feed port is provided on one side of the mounting bracket, and a drive bracket device is fixedly connected to the other side of the mounting bracket, the drive bracket device includes a drive bracket, the drive bracket is used to install the second drive motor, the lower end of the second drive motor is connected to the first pulley, the drive bracket is rotatably connected with a rotating shaft, the rotating shaft vertically passes through the upper cover downward, a lower gear is provided at the lower end of the rotating shaft, an upper pulley is provided at the upper end of the rotating shaft, the upper pulley and the first pulley are connected by a transmission belt, and a rotating mounting groove is provided at the center of the lower end surface of the upper cover, and the rotating mounting groove is used to install the crystallization inner tank device.

[0008] As a further configuration of the above scheme, the disturbance device includes a disturbance roller, a drive motor and an inner gear ring, the disturbance roller includes a disturbance column, the disturbance column is vertically rotatably connected in the annular cooling chamber, a driven gear is provided at the lower end of the disturbance column, and evenly distributed disturbance blades are provided on the disturbance column, the inner gear ring is rotatably connected in the mounting ring, the drive motor is fixedly mounted on the mounting ring, a drive gear is provided on the drive motor, the drive gear is meshed with the inner gear ring, the drive motor drives the inner gear ring to rotate through the drive gear, the inner gear ring drives the driven gear to rotate, and the driven gear drives the disturbance roller to rotate in the annular cooling chamber.

[0009] As a further configuration of the above scheme, the crystallization inner tank body device includes a crystallization inner tank body, an upper sealing cover plate is fixedly connected to the upper end of the crystallization inner tank body, a sealing ring plate is provided on the outer edge of the upper sealing cover plate, the sealing ring plate is slidingly and sealingly connected to the inner wall of the crystallization outer tank body, a one-way valve device is provided on the upper sealing cover plate, a rotating mounting platform is provided at the center of the upper sealing cover plate, the rotating mounting platform is rotatably connected to the rotating mounting groove, and gear teeth are provided on the outer edge of the rotating mounting platform, which are meshingly connected to the lower gear.

[0010] As a further configuration of the above scheme, a spiral blade is provided on the outer wall of the crystallization inner tank body, the outer edge of the spiral blade is slidably connected to the inner wall of the crystallization outer tank body, the upper end area of ​​the outer wall of the crystallization inner tank body is provided with evenly distributed through holes, the lower end surface of the crystallization inner tank body is slidably connected to the connecting block, and the inner wall of the crystallization inner tank body is sealed and connected to the sealing ring.

[0011] As a further configuration of the above scheme, the conveying auger device includes a main shaft, the upper end of the main shaft penetrates upward through the upper sealing cover plate and is rotatably connected to the upper sealing cover plate, the upper end of the main shaft is fixedly connected to a connecting column, the upper end of the connecting column is transmission-connected to the first drive motor, the lower end of the main shaft is rotatably connected to the rotating table, and a conveying auger is fixedly connected to the main shaft, and the outer edge of the conveying auger is slidably connected to the inner wall of the crystallization tank.

[0012] As a further configuration of the above scheme, the stirring device includes a stirring shaft, an upper mounting platform is provided at the upper end of the stirring shaft, a lower mounting platform is provided at the lower end of the stirring shaft, a stirring motor is connected to the lower end of the lower mounting platform, an upper scraper with uniform radial divergence is fixedly connected to the upper mounting platform, a stirring column vertically downward is connected to the lower end of the upper scraper, a lower inclined scraper is connected to the lower end of the stirring column, one end of the lower inclined scraper is fixedly connected to the upper scraper, and the other end of the lower inclined scraper is fixedly connected to the lower mounting platform, the upper scraper is in contact with the lower end surface of the circular filter plate, and the lower inclined scraper is in contact with the inner wall of the lower conical tank.

[0013] As a further configuration of the above scheme, the discharge device includes the discharge pipe, which is fixed vertically downward on the lower conical tank, a discharge valve is provided on the discharge pipe, and a mounting plate is fixedly connected to the lower end of the discharge pipe.

[0014] Beneficial effects of the present invention: A saturated solution is added between the upper cover and the upper sealing cover plate through the feed port, the saturated solution enters the inner tank body of the crystallizer through the one-way valve device, the first drive motor drives the conveying auger device to rotate, the second drive motor drives the inner tank body of the crystallizer to rotate through the driving bracket device, the conveying auger device conveys the saturated solution from bottom to top, the saturated solution enters the outside of the inner tank body of the crystallizer through the through hole, the inner tank body of the crystallizer drives the saturated solution to be conveyed from top to bottom into the lower conical tank through the spiral blade, and heat exchange is carried out with the cooling water in the annular cooling chamber during the downward conveying process, the cooling is uniform and sufficient, and sufficient stirring is carried out at the same time to improve the crystallization efficiency.

[0015] When the saturated solution is circulated and cooled, the crystals are filtered by the circular filter plate and retained in the lower conical tank. At the same time, the stirring device stirs to prevent the crystals from adhering to the lower conical tank and the circular filter plate, making it convenient for the discharging device to discharge and improving the working efficiency of the equipment.

[0016] The cooling water enters the annular cooling cavity from the circulating water device on one side and enters the annular cooling cavity and is discharged from the circulating water device on the other side. When the cooling water flows in the annular cooling cavity for heat exchange, the disturbance device rotates synchronously to stir the cooling water in the annular cooling cavity for uniform heat exchange, thereby improving the cooling effect and further improving the crystallization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 2 It is a schematic diagram of the appearance of the present invention; Figure 3 It is a cross-sectional schematic diagram of the crystallization outer tank device and the upper cover device of the present invention; Figure 4 A is a partial enlarged schematic diagram of the present invention; Figure 5 It is a schematic diagram of the disturbance device of the present invention; Figure 6 It is a partial enlarged schematic diagram of B of the present invention; Figure 7 It is a schematic diagram of the crystallization inner tank device of the present invention; Figure 8 It is a schematic diagram of a conveying auger device of the present invention; Fig. 9 Schematic diagram of the stirring device of the present invention.

[0018] Crystallization outer tank device; 2. Upper cover device; 3. First drive motor; 4. Second drive motor; 5. Disturbance device; 6. Crystallization inner tank device; 7. Conveying auger device; 8. Stirring device; 9. Discharging device; 101. Crystallization outer tank; 102. Annular cooling chamber; 103. Circulating water device; 104. Circular filter plate; 1041. Filter hole; 1042. Connecting block; 1043. Rotating table; 1044. Sealing ring; 105. Lower conical tank; 1051. Mounting groove; 106. Mounting ring; 201. Upper cover; 202. Mounting bracket; 203. Feed inlet; 204. Driving bracket device; 2041. Driving bracket; 2042. Rotating shaft; 2043. Lower gear; 2044. Upper pulley; 2045. Transmission belt; 205. Rotating mounting Grooving; 401, first pulley; 501, disturbance roller; 5011, disturbance column; 5012, driven gear; 5013, disturbance blade; 502, inner gear ring; 503, drive motor; 5031, drive gear; 601, crystal inner tank; 6011, through hole; 602, spiral blade; 603, upper sealing cover plate; 6031, sealing ring plate; 6032, one-way valve device; 604, rotating mounting table; 6041, gear teeth; 701, main shaft; 702, connecting column; 703, conveying auger; 801, stirring shaft; 802, upper mounting table; 803, lower mounting table; 804, stirring motor; 805, upper scraper; 806, stirring column; 807, lower inclined scraper; 901, discharge pipe; 902, discharge valve; 903, mounting plate. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 9 The present application is described in detail with reference to embodiments.

[0021] The present embodiment discloses a crystallization kettle for producing m-toluic acid, comprising a crystallization outer tank device 1, the crystallization outer tank device 1 comprising a crystallization outer tank 101, the upper end of the crystallization outer tank 101 is connected to an upper cover device 2, the lower end of the crystallization outer tank 101 is fixedly connected to a lower conical tank 105, a circular filter plate 104 is provided at the connection between the crystallization outer tank 101 and the lower conical tank 105, an annular cooling cavity 102 is provided on the outer wall of the crystallization outer tank 101, a circumferentially arranged disturbance device 5 is provided in the annular cooling cavity 102, a first driving motor 3 and a second driving motor 4 are provided on the upper cover device 2, a crystallization inner tank device 6 with the same central axis is provided in the crystallization outer tank 101, and a crystallization inner tank device 6 with the same central axis is provided in the crystallization inner tank The upper end of the tank body device 6 is rotatably connected to the center of the upper cover device 2, the tank body device 6 in the crystal is transmission-connected to the second drive motor 4, a conveying auger device 7 with the same central axis is provided in the tank body device 6 in the crystal, the upper end of the conveying auger device 7 is transmission-connected to the first drive motor 3, a stirring device 8 is rotatably connected in the lower conical tank 105, a discharging device 9 is provided on the lower conical tank 105, the discharging device 9 includes the discharging pipe 901, the discharging pipe 901 is vertically fixed on the lower conical tank 105, a discharging valve 902 is provided on the discharging pipe 901, and a mounting plate 903 is fixedly connected to the lower end of the discharging pipe 901, and the mounting plate 903 is used to rotatably install the stirring device 8.

[0022] like Figure 3 , Figure 4As shown, a symmetrical circulating water device 103 is provided on the outer wall of the annular cooling chamber 102, and the circulating water device 103 can circulate and transport cooling water in the annular cooling chamber 102. A filter hole 1041 is opened on the circular filter plate 104, and a rotating platform 1043 is provided at the center of the upper end surface of the circular filter plate 104. The outer edge of the circular filter plate 104 is provided with a circumferentially distributed connecting block 1042, and the circular filter plate 104 is fixedly connected to the inner wall of the crystallization outer tank body 104 through the connecting block 1042. A sealing ring 1044 concentric with the circular filter plate 104 is provided on the inner side of the upper end of the connecting block 1042. A mounting ring 106 is provided on the outer side of the lower end of the crystallization outer tank body 104, and a mounting groove 1051 is provided at the lower end of the lower conical tank 105. The upper cover device 2 includes an upper cover 201, and a mounting bracket 202 is provided at the center of the upper end surface of the upper cover 201. The mounting bracket 202 is used for To install the first driving motor 3, a feeding port 203 is provided on one side of the mounting bracket 202, and a driving bracket device 204 is fixedly connected to the other side of the mounting bracket 202, and the driving bracket device 204 includes a driving bracket 2041, and the driving bracket 2041 is used to install the second driving motor 4. The lower end of the second driving motor 4 is connected to the first pulley 401, and the driving bracket 2041 is rotatably connected with a rotating shaft 2042, and the rotating shaft 2042 vertically passes through the upper cover 201 downward, and a lower gear 2043 is provided at the lower end of the rotating shaft 2042, and an upper pulley 2044 is provided at the upper end of the rotating shaft 2042. The upper pulley 2044 and the first pulley 401 are connected by a transmission belt 2045. A rotating mounting groove 205 is provided at the center of the lower end surface of the upper cover 201, and the rotating mounting groove 205 is used to install the crystallization inner tank device 6.

[0023] like Figure 5 , Figure 6 As shown, the disturbance device 5 includes a disturbance roller 501, a drive motor 503 and an inner gear ring 502. The disturbance roller 501 includes a disturbance column 5011. The disturbance column 5011 is vertically rotatably connected in the annular cooling chamber 102. A driven gear 5012 is provided at the lower end of the disturbance column 5011. The disturbance column 5011 is provided with evenly distributed disturbance blades 5013. The inner gear ring 502 is rotatably connected in the mounting ring 106. The drive motor 503 is fixedly mounted on the mounting ring 106. A drive gear 5031 is provided on the drive motor 503. The drive gear 5031 is meshed with the inner gear ring 502. The drive motor 503 drives the inner gear ring 502 to rotate through the drive gear 5031. The inner gear ring 502 drives the driven gear 5012 to rotate. The driven gear 5012 drives the disturbance roller 501 to rotate in the annular cooling chamber 102.

[0024] like Figure 7As shown, the crystallization inner tank device 6 comprises a crystallization inner tank 601, an upper sealing cover plate 603 is fixedly connected to the upper end of the crystallization inner tank 601, a sealing ring plate 6031 is provided on the outer edge of the upper sealing cover plate 603, the sealing ring plate 6031 is slidingly sealed with the inner wall of the crystallization outer tank 101, a one-way valve device 6032 is provided on the upper sealing cover plate 603, a rotating mounting platform 604 is provided at the center of the upper sealing cover plate 603, and the rotating mounting platform 604 is rotatably connected with the rotating mounting groove 205, The outer edge of the rotating mounting table 604 is provided with gear teeth 6041, which are meshed with the lower gear 2043. A spiral blade 602 is provided on the outer wall of the crystal inner tank body 601. The outer edge of the spiral blade 602 is slidably connected to the inner wall of the crystal outer tank body 101. The upper end area of ​​the outer wall of the crystal inner tank body 601 is provided with evenly distributed through holes 6011. The lower end surface of the crystal inner tank body 601 is slidably connected to the connecting block 1042, and the inner wall of the crystal inner tank body 601 is sealed and connected to the sealing ring 1044.

[0025] like Figure 8 As shown, the conveying auger device 7 includes a main shaft 701, the upper end of the main shaft 701 upwardly penetrates the upper sealing cover plate 603 and is rotatably connected to the upper sealing cover plate 603, the upper end of the main shaft 701 is fixedly connected to a connecting column 702, the upper end of the connecting column 702 is transmission-connected to the first drive motor 3, the lower end of the main shaft 701 is rotatably connected to the rotating table 1043, and a conveying auger 703 is fixedly connected to the main shaft 701, and the outer edge of the conveying auger 703 is slidably connected to the inner wall of the crystal inner tank body 601.

[0026] like Fig. 9 As shown, the stirring device 8 includes a stirring shaft 801, an upper mounting platform 802 is provided at the upper end of the stirring shaft 801, a lower mounting platform 803 is provided at the lower end of the stirring shaft 801, a stirring motor 804 is connected to the lower end of the lower mounting platform 803, an upper scraper 805 that is uniformly radially divergent is fixedly connected to the upper mounting platform 802, a stirring column 806 that is vertically downward is connected to the lower end of the upper scraper 805, a lower oblique scraper 807 is connected to the lower end of the stirring column 806, one end of the lower oblique scraper 807 is fixedly connected to the upper scraper 805, and the other end of the lower oblique scraper 807 is fixedly connected to the lower mounting platform 803, the lower mounting platform 803 is rotatably installed in the mounting groove 1051, the upper scraper 805 contacts the lower end surface of the circular filter plate 104, the lower oblique scraper 807 contacts the inner wall of the lower conical tank 108, and the stirring motor 804 is fixedly installed on the mounting plate 903.

[0027] Working process: cooling water enters the annular cooling chamber 102 from the circulating water device 103 on one side, and enters the annular cooling chamber 102 and is discharged from the circulating water device 103 on the other side. When the cooling water flows in the annular cooling chamber 102 for heat exchange, the driving motor 503 drives the inner gear ring 502 to rotate through the driving gear 5031, and the inner gear ring 502 drives the driven gear 5012 to rotate. The driven gear 5012 drives the disturbance roller 501 to rotate in the annular cooling chamber 102, so as to stir the cooling water in the annular cooling chamber 102. The cooling water is in full contact with the outer wall of the crystallization outer tank body 101 to ensure the efficiency of heat exchange. At the same time, a saturated solution is added to the space between the upper cover 201 and the upper sealing cover plate 603 through the feed port 203. The saturated solution enters the crystallization inner tank body 601 through the one-way valve device 6032. The saturated solution flows downward in a spiral along the conveying auger 703, gradually filling the crystallization inner tank body 601 and the lower conical tank 105. The first drive motor 3 drives the conveying auger device 7 to rotate, and the second drive motor 4 drives the first pulley 401 to rotate. A pulley 401 drives the upper pulley 2044 to rotate through the transmission belt 2045, and the upper pulley 2044 drives the lower gear 2043 to rotate through the rotating shaft 2042. The lower gear 2043 drives the crystal inner tank 601 to rotate through the gear teeth 6041. The crystal inner tank 601 and the auger device 7 rotate synchronously in the opposite direction. The conveying auger 703 conveys the saturated solution from bottom to top, and the saturated solution enters the outer side of the crystal inner tank 601 from the through hole 6011. The crystal inner tank 601 drives the saturated solution from the upper tank 601 through the spiral blade 602. It is transported downward into the lower conical tank 105 to realize the upward and downward circulation and stirring of the saturated solution. When the saturated solution is circulated and cooled, the crystals are filtered by the circular filter plate 104 and retained in the lower conical tank 105. At the same time, the stirring device 8 is stirring. When the stirring device 8 is working, the upper scraper 805 contacts the lower end surface of the circular filter plate 104, and the lower inclined scraper 807 contacts the inner wall of the lower conical tank 108 to prevent the crystals from adhering to the lower conical tank 105 and the circular filter plate 104, and at the same time facilitate the discharging of the discharging device 9 to avoid blockage.

[0028] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A crystallization kettle for the production of m-toluic acid, comprising a crystallization outer tank device, wherein the crystallization outer tank device comprises a crystallization outer tank body, characterized in that: The upper end of the crystallization outer tank body is connected to an upper cover device, and the lower end of the crystallization outer tank body is fixedly connected to a lower conical tank, a circular filter plate is provided at the connection between the crystallization outer tank body and the lower conical tank, the outer wall of the crystallization outer tank body is provided with an annular cooling cavity, and a circumferentially arranged disturbance device is provided in the annular cooling cavity, the upper cover device is provided with a first drive motor and a second drive motor, the crystallization outer tank body is provided with a crystallization inner tank body device with the same central axis, the upper end of the crystallization inner tank body device is rotatably connected to the center of the upper cover device, the crystallization inner tank body device is transmission-connected to the second drive motor, the crystallization inner tank body device is provided with a conveying auger device with the same central axis, the upper end of the conveying auger device is transmission-connected to the first drive motor, the lower conical tank is rotatably connected with a stirring device, and a discharging device is provided on the lower conical tank.

2. The crystallization kettle for producing m-toluic acid according to claim 1, characterized in that A symmetrical circulating water device is provided on the outer wall of the annular cooling chamber, filter holes are opened on the circular filter plate, a rotating platform is provided at the center of the upper end surface of the circular filter plate, circumferentially distributed connecting blocks are provided on the outer edge of the circular filter plate, the circular filter plate is fixedly connected to the inner wall of the crystallization outer tank body through the connecting blocks, a sealing ring concentric with the circular filter plate is provided on the inner side of the upper end of the connecting block, a mounting ring is provided on the outer side of the lower end of the crystallization outer tank body, and a mounting groove is provided at the lower end of the lower conical tank.

3. The crystallization kettle for producing m-toluic acid according to claim 1, characterized in that: The upper cover device includes an upper cover, a mounting bracket is provided at the center of the upper end surface of the upper cover, a feed port is provided on one side of the mounting bracket, and a driving bracket device is fixedly connected to the other side of the mounting bracket, the driving bracket device includes a driving bracket, the driving bracket is used to install a second driving motor, the lower end of the second driving motor is connected to a first pulley, a rotating shaft is rotatably connected to the driving bracket, the rotating shaft vertically passes through the upper cover downward, a lower gear is provided at the lower end of the rotating shaft, an upper pulley is provided at the upper end of the rotating shaft, the upper pulley and the first pulley are connected by a transmission belt, and a rotating mounting groove is provided at the center of the lower end surface of the upper cover.

4. The crystallization kettle for producing m-toluic acid according to claim 2, characterized in that The disturbance device includes a disturbance roller, a drive motor and an inner gear ring. The disturbance roller includes a disturbance column. The disturbance column is vertically rotatably connected in the annular cooling chamber. A driven gear is provided at the lower end of the disturbance column. Evenly distributed disturbance blades are provided on the disturbance column. The inner gear ring is rotatably connected in the mounting ring. The drive motor is fixedly mounted on the mounting ring. A drive gear is provided on the drive motor. The drive gear is meshed with the inner gear ring.

5. The crystallization kettle for producing m-toluic acid according to claim 2, characterized in that: The crystallization inner tank body device comprises a crystallization inner tank body, an upper sealing cover plate is fixedly connected to the upper end of the crystallization inner tank body, a sealing ring plate is provided on the outer edge of the upper sealing cover plate, the sealing ring plate is slidingly and sealingly connected to the inner wall of the crystallization outer tank body, a one-way valve device is provided on the upper sealing cover plate, a rotating mounting platform is provided at the center of the upper sealing cover plate, the rotating mounting platform is rotatably connected to the rotating mounting groove, gear teeth are provided on the outer edge of the rotating mounting platform, and the gear teeth are meshed and connected with the lower gear.

6. The crystallization kettle for producing m-toluic acid according to claim 5, characterized in that: The outer wall of the crystal inner tank body is provided with a spiral blade, the outer edge of the spiral blade is slidably connected to the inner wall of the crystal outer tank body, the upper end area of ​​the outer wall of the crystal inner tank body is provided with evenly distributed through holes, the lower end surface of the crystal inner tank body is slidably connected to the connecting block, and the inner wall of the crystal inner tank body is sealed and connected to the sealing ring.

7. The crystallization kettle for producing m-toluic acid according to claim 3, characterized in that: The conveying auger device includes a main shaft, the upper end of the main shaft penetrates the upper sealing cover plate upward and is rotatably connected to the upper sealing cover plate, the upper end of the main shaft is fixedly connected to a connecting column, the upper end of the connecting column is transmission-connected to a first driving motor, the lower end of the main shaft is rotatably connected to a rotating table, a conveying auger is fixedly connected to the main shaft, and the outer edge of the conveying auger is slidably connected to the inner wall of the crystallization inner tank.

8. The crystallization kettle for producing m-toluic acid according to claim 2, characterized in that: The stirring device includes a stirring shaft, an upper mounting platform is provided at the upper end of the stirring shaft, a lower mounting platform is provided at the lower end of the stirring shaft, a stirring motor is connected to the lower end of the lower mounting platform, an upper scraper that is uniformly radially divergent is fixedly connected to the upper mounting platform, a stirring column that is vertically downward is connected to the lower end of the upper scraper, a lower inclined scraper is connected to the lower end of the stirring column, one end of the lower inclined scraper is fixedly connected to the upper scraper, and the other end of the lower inclined scraper is fixedly connected to the lower mounting platform, the upper scraper contacts the lower end surface of the circular filter plate, and the lower inclined scraper contacts the inner wall of the lower conical tank.

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