Preparation method and device of 2-chloronicotinic acid

Abstract

The invention relates to the technical field of chemistry, in particular to a preparation method and device of 2-chloronicotinic acid, and the preparation device of 2-chloronicotinic acid comprises a reaction kettle; the device further comprises a preparation assembly. The preparation assembly comprises a kettle cover, a rotating cylinder, a mounting frame, a driving mechanism, a plurality of rotating stirring blade mechanisms, a plurality of bevel pinions, a fixed shaft, a plurality of bevel gear wheels, a dropwise adding mechanism and a lifting mechanism; when in use, the reaction liquid is added into the reaction kettle, the reaction kettle heats the reaction liquid to a set temperature, and the temperature is kept; hydrochloric acid is dropwise added into the reaction kettle by utilizing the dropwise adding mechanism, and the driving mechanism is started, so that the rotating barrel drives the plurality of rotating stirring blade mechanisms to revolve around the rotating barrel while rotating, and reaction liquid and the dropwise added hydrochloric acid are rapidly and uniformly mixed, so that the dropwise added hydrochloric acid and the reaction liquid can be rapidly and effectively stirred uniformly, and side reaction is avoided.

Description

Technical Field

[0001] The present invention relates to the field of chemical technology, and particularly relates to a preparation method and device for 2-chloronicotinic acid. Background Art

[0002] 2-Chloronicotinic acid, also known as 2-chloro-3-pyridinecarboxylic acid, is an important component or synthetic intermediate of some highly effective and low-toxic pesticides, such as insecticides, herbicides, etc.; it can also be an important intermediate in the synthesis process of some drug molecules and participate in the preparation process of various drugs.

[0003] In the prior art, in the acidification crystallization step of preparing 2-chloronicotinic acid, the reaction solution is filled in a reaction kettle, then hydrochloric acid is dripped into the reaction solution, and a stirrer is used to stir evenly, and crystal cultivation is carried out at a certain temperature for a period of time, and finally the temperature is rapidly decreased to precipitate crystals.

[0004] However, the stirring method of the stirrer of the existing reaction kettle is single, and the stirring effect is poor. It cannot quickly stir the dripped hydrochloric acid and the reaction solution evenly, and it is easy to cause side reactions due to local over-acidity. Summary of the Invention

[0005] The purpose of the present invention is to provide a preparation method and device for 2-chloronicotinic acid, which can quickly and effectively stir the dripped hydrochloric acid and the reaction solution evenly to avoid side reactions.

[0006] To achieve the above purpose, in a first aspect, the present invention provides a preparation device for 2-chloronicotinic acid, including a reaction kettle;

[0007] It further includes a preparation component;

[0008] The preparation component includes a kettle cover, a rotating cylinder, a mounting rack, a driving mechanism, a plurality of rotating stirring blade mechanisms, a plurality of small bevel gears, a fixed shaft, a plurality of large bevel gears, a dripping mechanism, and a lifting mechanism;

[0009] The kettle cover is arranged on the top of the reaction kettle; the rotating cylinder is rotatably arranged on the kettle cover and passes through the kettle cover; the mounting frame is fixedly arranged on the top of the kettle cover and is rotatably connected to the rotating cylinder; the driving mechanism is arranged on the mounting frame and is used to drive the rotating cylinder to rotate; a plurality of the rotating stirring blade mechanisms are respectively rotatably arranged on the rotating cylinder; a small bevel gear is fixedly arranged at the end of each of the rotating stirring blade mechanisms, and a plurality of the small bevel gears are all located inside the rotating cylinder; the fixed shaft is fixedly connected to the mounting frame, is rotatably connected to the rotating cylinder, and is located inside the rotating cylinder; a plurality of large bevel gears are respectively fixedly arranged on the fixed shaft and are respectively located inside the rotating cylinder; each large bevel gear meshes with four small bevel gears; the dropping mechanism is arranged on the mounting frame; the lifting mechanism is arranged on the reaction kettle and is used to lift the kettle cover.

[0010] Among them, the driving mechanism includes a motor, a driving gear and a driven gear;

[0011] The motor is fixedly arranged on the mounting frame; the driving gear is fixedly arranged at the output end of the motor; the driven gear is fixedly arranged on the rotating cylinder and meshes with the driving gear.

[0012] Among them, the rotating stirring blade mechanism includes a rotating shaft and a plurality of blades;

[0013] The rotating shaft is rotatably arranged on the rotating cylinder, and a small bevel gear is fixedly arranged at one end of the rotating shaft; a plurality of the blades are respectively fixedly arranged on the rotating shaft.

[0014] Among them, the dropping mechanism includes a transfer tank, a regulating valve and a dropping pipe;

[0015] The transfer tank is fixedly arranged on the top of the mounting frame; the regulating valve is connected in communication on one side of the transfer tank; the dropping pipe is communicated with the regulating valve, is fixedly connected to the kettle cover, and passes through the kettle cover.

[0016] Among them, the lifting mechanism includes two hydraulic cylinders, a top frame and two connecting rods;

[0017] The two hydraulic cylinders are respectively fixedly arranged on the side of the reaction kettle; the top frame is fixedly arranged at the output ends of the two hydraulic cylinders; the two connecting rods are respectively fixedly connected to the top frame, are respectively fixedly connected to the kettle cover, and are respectively located on the top of the kettle cover.

[0018] Among them, the preparation assembly further includes a base and a plurality of universal wheels;

[0019] The base is fixedly arranged at the bottom of the reaction kettle; the plurality of universal wheels are respectively rotatably arranged at the bottom of the base.

[0020] Among them, the preparation assembly further includes a plurality of screws and a plurality of chassis;

[0021] The plurality of screws are respectively threadedly connected to the base and respectively pass through the base; the plurality of chassis are respectively rotatably arranged at the bottoms of the plurality of screws.

[0022] In a second aspect, the present invention also provides a method for preparing 2-chloronicotinic acid, including:

[0023] The lifting mechanism lifts the kettle lid, adds the reaction solution into the reaction kettle, and then the lifting mechanism drives the kettle lid to move down and reset, covering the top of the reaction kettle;

[0024] The reaction kettle heats the reaction solution to a set temperature and maintains the temperature;

[0025] Using the dropping mechanism to start dropping hydrochloric acid into the reaction kettle, and starting the driving mechanism, so that the rotating cylinder drives a plurality of rotating stirring blade mechanisms to quickly mix the reaction solution and the dropped hydrochloric acid evenly until the set pH value is adjusted;

[0026] After continuing to keep warm for a period of time, the reaction kettle stops keeping warm, and the temperature slowly drops, so that 2-chloronicotinic acid crystals precipitate.

[0027] For a method and device for preparing 2-chloronicotinic acid according to the present invention, the reaction kettle can be electrically heated and insulated; the kettle lid covers the top of the reaction kettle and is driven by the lifting mechanism to move up and down; the dropping mechanism is used to drop hydrochloric acid into the reaction kettle; the rotating cylinder is rotatably installed on the kettle lid, and the top of the rotating cylinder is also rotatably connected to the mounting frame; the driving mechanism is used to drive the rotating cylinder to rotate, and a plurality of rotating stirring blade mechanisms are rotatably arranged on the rotating cylinder, and every four rotating stirring blade mechanisms are arranged at the same height and are arranged around the rotating cylinder for one week, and there is a small bevel gear at one end of each rotating stirring blade mechanism; a fixed shaft is fixedly installed on the mounting frame, the top of the fixed shaft is fixedly connected to the mounting frame, and the bottom is rotatably connected to the rotating cylinder. A plurality of large bevel gears are installed on the fixed shaft, and every four small bevel gears are meshed with one large bevel gear. When the rotating cylinder is driven to rotate, it drives the rotating stirring blade mechanism to revolve around the rotating cylinder, and the corresponding small bevel gear at the end also revolves around the large bevel gear. When the small bevel gear revolves around the large bevel gear, due to meshing with the large bevel gear, it will also rotate, thereby driving the rotating stirring blade mechanism to rotate. Therefore, when stirring, the plurality of rotating stirring blade mechanisms not only revolve around the rotating cylinder, but also rotate, making the reaction solution produce a more complex flow pattern and better stirring effect, so that the dropped hydrochloric acid can be quickly and effectively stirred evenly with the reaction solution, avoiding side reactions. Description of the Drawings

[0028] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art.

[0029] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention.

[0030] Figure 2 It is a front view of the first embodiment of the present invention.

[0031] Figure 3 It is a schematic structural diagram of the first embodiment of the present invention from another angle.

[0032] Figure 4 It is a schematic structural diagram of the first embodiment of the present invention from another angle.

[0033] Figure 5 It is a cross-sectional view of the first embodiment of the present invention.

[0034] Figure 6 It is Figure 5 A partial enlarged view of detail A.

[0035] Figure 7 It is a schematic flow chart of the second embodiment of the present invention.

[0036] 1 - Reactor, 2 - Kettle cover, 3 - Rotating cylinder, 4 - Mounting frame, 5 - Driving mechanism, 6 - Rotating stirring blade mechanism, 7 - Small bevel gear, 8 - Fixed shaft, 9 - Large bevel gear, 10 - Dripping mechanism, 11 - Lifting mechanism, 12 - Base, 13 - Universal wheel, 14 - Screw, 15 - Chassis, 51 - Motor, 52 - Driving gear, 53 - Driven gear, 61 - Rotating shaft, 62 - Paddle, 101 - Intermediate tank, 102 - Control valve, 103 - Dripping pipe, 111 - Hydraulic cylinder, 112 - Top frame, 113 - Connecting rod. Specific embodiments

[0037] The first embodiment of the present application is as follows:

[0038] Please refer to Figures 1-6 , where Figure 1 It is a schematic structural diagram of the first embodiment of the present invention. Figure 2 It is a front view of the first embodiment of the present invention. Figure 3 It is a schematic structural diagram of the first embodiment of the present invention from another angle. Figure 4 It is a schematic structural diagram of the first embodiment of the present invention from another angle. Figure 5 It is a cross-sectional view of the first embodiment of the present invention. Figure 6 It is Figure 5 A partial enlarged view of detail A.

[0039] The present invention provides a preparation device for 2-chloronicotinic acid, which comprises a reaction kettle 1; and further comprises a preparation component. The preparation component includes a kettle cover 2, a rotating cylinder 3, a mounting frame 4, a driving mechanism 5, a plurality of rotating stirring blade mechanisms 6, a plurality of small bevel gears 7, a fixed shaft 8, a plurality of large bevel gears 9, a dropping mechanism 10 and a lifting mechanism 11. The driving mechanism 5 includes a motor 51, a driving gear 52 and a driven gear 53. The rotating stirring blade mechanism 6 includes a rotating shaft 61 and a plurality of blades 62. The dropping mechanism 10 includes a transfer tank 101, a regulating valve 102 and a dropping pipe 103. The lifting mechanism 11 includes two hydraulic cylinders 111, a top frame 112 and two connecting rods 113. The preparation component further includes a base 12 and a plurality of universal wheels 13. The preparation component further includes a plurality of screws 14 and a plurality of chassis 15. Through the foregoing solution, the dropped hydrochloric acid can be quickly and effectively stirred evenly with the reaction solution, avoiding the initiation of side reactions.

[0040] Further, the kettle cover 2 is arranged on the top of the reaction kettle 1; the rotating cylinder 3 is rotatably arranged on the kettle cover 2 and passes through the kettle cover 2; the mounting frame 4 is fixedly arranged on the top of the kettle cover 2 and is rotatably connected with the rotating cylinder 3; the driving mechanism 5 is arranged on the mounting frame 4 for driving the rotating cylinder 3 to rotate; a plurality of the rotating stirring blade mechanisms 6 are respectively rotatably arranged on the rotating cylinder 3; one of the small bevel gears 7 is fixedly arranged at the end of each rotating stirring blade mechanism 6, and a plurality of the small bevel gears 7 are all located inside the rotating cylinder 3; the fixed shaft 8 is fixedly connected with the mounting frame 4, is rotatably connected with the rotating cylinder 3 and is located inside the rotating cylinder 3; a plurality of the large bevel gears 9 are respectively fixedly arranged on the fixed shaft 8 and are respectively located inside the rotating cylinder 3; each large bevel gear 9 meshes with four small bevel gears 7; the dropping mechanism 10 is arranged on the mounting frame 4; the lifting mechanism 11 is arranged on the reaction kettle 1 for lifting the kettle cover 2.

[0041] In this embodiment, the reaction kettle 1 can be electrically heated and insulated; the kettle cover 2 is covered on the top of the reaction kettle 1 and is driven by the lifting mechanism 11 to move up and down; the dropping mechanism 10 is used to drop hydrochloric acid into the reaction kettle 1; the rotating cylinder 3 is rotatably installed on the kettle cover 2, and the top of the rotating cylinder 3 is also rotatably connected to the mounting bracket 4; the driving mechanism 5 is used to drive the rotating cylinder 3 to rotate, and a plurality of rotating stirring blade mechanisms 6 are rotatably arranged on the rotating cylinder 3. Every four rotating stirring blade mechanisms 6 are arranged at the same height and are arranged around the rotating cylinder 3 for one week. One small bevel gear 7 is provided at one end of each rotating stirring blade mechanism 6; a fixed shaft 8 is fixedly installed on the mounting bracket 4. The top of the fixed shaft 8 is fixedly connected to the mounting bracket 4, and the bottom is rotatably connected to the rotating cylinder 3. A plurality of large bevel gears 9 are installed on the fixed shaft 8. Every four small bevel gears 7 are meshed with one large bevel gear 9. When the rotating cylinder 3 is driven to rotate, it drives the rotating stirring blade mechanism 6 to revolve around the rotating cylinder 3, and the small bevel gear 7 at the corresponding end also revolves around the large bevel gear 9. When the small bevel gear 7 revolves around the large bevel gear 9, due to meshing with the large bevel gear 9, it will also rotate, thereby driving the rotating stirring blade mechanism 6 to rotate. Therefore, during stirring, a plurality of rotating stirring blade mechanisms 6 not only revolve around the rotating cylinder 3, but also rotate, making the reaction liquid generate a more complex flow pattern and having a better stirring effect. Thus, the dropped hydrochloric acid and the reaction liquid can be quickly and effectively stirred evenly, avoiding the occurrence of side reactions.

[0042] Further, the driving mechanism 5 includes a motor 51, a driving gear 52 and a driven gear 53;

[0043] The motor 51 is fixedly arranged on the mounting bracket 4; the driving gear 52 is fixedly arranged at the output end of the motor 51; the driven gear 53 is fixedly arranged on the rotating cylinder 3 and meshes with the driving gear 52.

[0044] In this embodiment, the motor 51 is installed on the mounting bracket 4, the driven gear 53 is installed on the rotating cylinder 3, the motor 51 drives the driving gear 52, and the driving gear 52 drives the meshed driven gear 53, thereby finally driving the rotating cylinder 3 to rotate.

[0045] Further, the rotating stirring blade mechanism 6 includes a rotating shaft 61 and a plurality of blades 62;

[0046] The rotating shaft 61 is rotatably arranged on the rotating cylinder 3, and a small bevel gear 7 is fixedly arranged at one end of the rotating shaft 61; a plurality of blades 62 are respectively fixedly arranged on the rotating shaft 61.

[0047] In this embodiment, when the small bevel gear 7 rotates, it drives the rotation of the rotating shaft 61, and the rotating shaft 61 drives the rotation of a plurality of the blades 62 to mix and stir the reaction liquid; specifically during stirring, the blades 62 rotate around both the rotating cylinder 3 and the rotating shaft 61, which can cause the reaction liquid to generate a more complex flow pattern and have a better stirring effect.

[0048] Furthermore, the dropping mechanism 10 includes a transfer tank 101, a regulating valve 102, and a dropping pipe 103;

[0049] The transfer tank 101 is fixedly arranged on the top of the mounting rack 4; the regulating valve 102 is communicatively arranged on one side of the transfer tank 101; the dropping pipe 103 is communicated with the regulating valve 102, fixedly connected to the kettle cover 2, and passes through the kettle cover 2.

[0050] In this embodiment, hydrochloric acid can be added to and temporarily stored in the transfer tank 101, the regulating valve 102 can adjust the dropping rate, the end of the dropping pipe 103 passes through the kettle cover 2 and extends into the reaction kettle 1, and by appropriately adjusting the regulating valve 102, hydrochloric acid can be slowly dropped into the reaction liquid in the reaction kettle 1.

[0051] Furthermore, the lifting mechanism 11 includes two hydraulic cylinders 111, a top frame 112, and two connecting rods 113;

[0052] The two hydraulic cylinders 111 are respectively fixedly arranged on the sides of the reaction kettle 1; the top frame 112 is fixedly arranged at the output ends of the two hydraulic cylinders 111; the two connecting rods 113 are respectively fixedly connected to the top frame 112, respectively fixedly connected to the kettle cover 2, and are respectively located on the top of the kettle cover 2.

[0053] In this embodiment, the two hydraulic cylinders 111 are fixedly arranged on the left and right sides of the reaction kettle 1, the two hydraulic cylinders 111 jack up the top frame 112, and the top frame 112 can lift the kettle cover 2 through the two connecting rods 113.

[0054] Furthermore, the preparation assembly further includes a base 12 and a plurality of universal wheels 13;

[0055] The base 12 is fixedly arranged at the bottom of the reaction kettle 1; the plurality of universal wheels 13 are respectively rotatably arranged at the bottom of the base 12.

[0056] In this embodiment, the base 12 supports the reaction kettle 1, the arrangement of the plurality of universal wheels 13 enables the reaction kettle 1 to be conveniently moved, and at the same time, the universal wheels 13 are self - equipped with brakes, which is convenient for stopping the base 12.

[0057] Further, the preparation assembly further includes a plurality of screws 14 and a plurality of chassis 15;

[0058] The plurality of screws 14 are respectively threadedly connected to the base 12 and respectively pass through the base 12; the plurality of chassis 15 are respectively rotatably arranged at the bottoms of the plurality of screws 14.

[0059] In this embodiment, after the base 12 stops, the plurality of screws 14 are turned to drive the plurality of chassis 15 to move downward and abut against the ground, stably supporting the base 12.

[0060] For the preparation device of 2-chloronicotinic acid described in this embodiment, the reaction kettle 1 can be electrically heated and insulated; the kettle lid 2 covers the top of the reaction kettle 1 and is driven to move up and down by the lifting mechanism 11; the dropping mechanism 10 is used to drop hydrochloric acid into the reaction kettle 1; the rotating cylinder 3 is rotatably installed on the kettle lid 2, and the top of the rotating cylinder 3 is also rotatably connected to the mounting frame 4; the driving mechanism 5 is used to drive the rotating cylinder 3 to rotate, and a plurality of rotating stirring blade mechanisms 6 are rotatably arranged on the rotating cylinder 3, and every four rotating stirring blade mechanisms 6 are arranged at the same height and are arranged around the rotating cylinder 3 in a circle. One end of each rotating stirring blade mechanism 6 has a small bevel gear 7; a fixed shaft 8 is fixedly installed on the mounting frame 4, the top of the fixed shaft 8 is fixedly connected to the mounting frame 4, and the bottom is rotatably connected to the rotating cylinder 3. A plurality of large bevel gears 9 are installed on the fixed shaft 8, and every four small bevel gears 7 are meshed with one large bevel gear 9. When the rotating cylinder 3 is driven to rotate, it drives the rotating stirring blade mechanisms 6 to revolve around the rotating cylinder 3, and the corresponding small bevel gears 7 at the ends also revolve around the large bevel gear 9. When the small bevel gear 7 revolves around the large bevel gear 9, due to meshing with the large bevel gear 9, it will also rotate, thereby driving the rotating stirring blade mechanism 6 to rotate. Therefore, during stirring, the plurality of rotating stirring blade mechanisms 6 not only revolve around the rotating cylinder 3 but also rotate, making the reaction liquid generate a more complex flow pattern and having a better stirring effect, so that the dropped hydrochloric acid can be quickly and effectively stirred with the reaction liquid to avoid causing side reactions.

[0061] The second embodiment of the present application is:

[0062] On the basis of the first embodiment, please refer to Figure 7 , where [[ID=?]] Figure 7 is the process schematic diagram of the second embodiment of the present invention.

[0063] A preparation method of 2-chloronicotinic acid provided by the present invention includes:

[0064] It should be noted that there seems to be an error in the original text where it says "please refer to Figure 7 , where [[ID=?]] Figure 7 is the process schematic diagram of the second embodiment of the present invention." as the "?" in the reference is not clear. This translation is based on the best understanding of the provided text.The lifting mechanism 11 lifts the kettle lid 2, adds the reaction solution into the reaction kettle 1, and then the lifting mechanism 11 drives the kettle lid 2 to move downward and reset, covering the top of the reaction kettle 1.

[0065] The reaction solution is a 2-chloronicotinic acid sodium solution formed by the hydrolysis of methyl 2-chloronicotinate under alkaline conditions.

[0066] S2 The reaction kettle 1 heats the reaction solution to a set temperature and maintains the temperature.

[0067] The set temperature is between 95 and 98 °C.

[0068] S3 Use the dropping mechanism 10 to start dropping hydrochloric acid into the reaction kettle 1, and start the driving mechanism 5, so that the rotating cylinder 3 drives a plurality of rotating stirring blade mechanisms 6 to quickly mix the reaction solution and the dropped hydrochloric acid evenly until the set pH value is adjusted.

[0069] The set pH value is 2 - 4.

[0070] S4 After continuing to keep warm for a period of time, the reaction kettle 1 stops keeping warm and the temperature slowly drops, causing 2-chloronicotinic acid crystals to precipitate.

[0071] The above-disclosed are only one or more preferred embodiments of the present application, and the scope of rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A preparation device for 2-chloronicotinic acid, comprising a reaction kettle; characterized in that, It further comprises a preparation component; The preparation component includes a kettle cover, a rotating cylinder, a mounting rack, a driving mechanism, a plurality of rotating stirring blade mechanisms, a plurality of small bevel gears, a fixed shaft, a plurality of large bevel gears, a dropping mechanism and a lifting mechanism; The kettle cover is arranged on the top of the reaction kettle; the rotating cylinder is rotatably arranged on the kettle cover and passes through the kettle cover; the mounting rack is fixedly arranged on the top of the kettle cover and is rotatably connected with the rotating cylinder; the driving mechanism is arranged on the mounting rack and is used to drive the rotating cylinder to rotate; a plurality of the rotating stirring blade mechanisms are respectively rotatably arranged on the rotating cylinder; one of the small bevel gears is fixedly arranged at the end of each of the rotating stirring blade mechanisms, and a plurality of the small bevel gears are all located inside the rotating cylinder; the fixed shaft is fixedly connected with the mounting rack, is rotatably connected with the rotating cylinder and is located inside the rotating cylinder; a plurality of the large bevel gears are respectively fixedly arranged on the fixed shaft and are respectively located inside the rotating cylinder; each of the large bevel gears meshes with four of the small bevel gears; the dropping mechanism is arranged on the mounting rack; the lifting mechanism is arranged on the reaction kettle and is used to lift the kettle cover.

2. The preparation device for 2-chloronicotinic acid according to claim 1, characterized in that, The driving mechanism includes a motor, a driving gear and a driven gear; The motor is fixedly arranged on the mounting rack; the driving gear is fixedly arranged at the output end of the motor; the driven gear is fixedly arranged on the rotating cylinder and meshes with the driving gear.

3. The preparation device for 2-chloronicotinic acid according to claim 2, characterized in that, The rotating stirring blade mechanism includes a rotating shaft and a plurality of blades; The rotating shaft is rotatably arranged on the rotating cylinder, and one of the small bevel gears is fixedly arranged at one end of the rotating shaft; a plurality of the blades are respectively fixedly arranged on the rotating shaft.

4. The preparation device for 2-chloronicotinic acid according to claim 3, characterized in that, The dropping mechanism includes a transfer tank, a regulating valve and a dropping pipe; The transfer tank is fixedly arranged on the top of the mounting rack; the regulating valve is connected in communication on one side of the transfer tank; the dropping pipe is communicated with the regulating valve, is fixedly connected with the kettle cover and passes through the kettle cover.

5. The preparation device for 2-chloronicotinic acid according to claim 4, characterized in that, The lifting mechanism includes two hydraulic cylinders, a top frame and two connecting rods; The two hydraulic cylinders are respectively fixedly arranged on the side of the reaction kettle; the top frame is fixedly arranged at the output ends of the two hydraulic cylinders; the two connecting rods are respectively fixedly connected with the top frame, are respectively fixedly connected with the kettle cover and are respectively located on the top of the kettle cover.

6. The preparation device for 2-chloronicotinic acid according to claim 5, characterized in that, The preparation component further includes a base and a plurality of universal wheels; The base is fixedly arranged at the bottom of the reaction kettle; a plurality of the universal wheels are respectively rotatably arranged at the bottom of the base.

7. The preparation device for 2-chloronicotinic acid according to claim 6, characterized in that, The preparation assembly further includes a plurality of screws and a plurality of chassis; The plurality of screws are respectively threadedly connected to the base and respectively pass through the base; the plurality of chassis are respectively rotatably arranged at the bottoms of the plurality of screws.

8. A preparation method of 2-chloronicotinic acid, which is applied to a preparation device of 2-chloronicotinic acid according to any one of claims 1 to 7, is characterized in that, Including: The lifting mechanism lifts the kettle cover, adds the reaction liquid into the reaction kettle, and then the lifting mechanism drives the kettle cover to move downward and reset, covering the top of the reaction kettle; The reaction kettle heats the reaction liquid to a set temperature and maintains the temperature; The dropping mechanism is used to start dropping hydrochloric acid into the reaction kettle, and the driving mechanism is started, so that the rotating cylinder drives the plurality of rotating stirring blade mechanisms to quickly mix the reaction liquid and the dropped hydrochloric acid evenly until the set pH value is adjusted; After continuing to keep warm for a period of time, the reaction kettle stops keeping warm, and the temperature slowly drops, so that 2-chloronicotinic acid crystals precipitate.

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