Safe Grignard reaction kettle

Abstract

The utility model belongs to the technical field of chemical production, and particularly relates to a safe Grignard reaction kettle which comprises a reaction kettle body, an initiator feeding pipe penetrates through the left side end of the top of the reaction kettle body, and the input end of the initiator feeding pipe is connected with a flow adjusting mechanism and connected with an initiator storage tank through the flow adjusting mechanism. The initiator storage tank and the flow regulating mechanism are arranged in a flow regulation and control mode, and meanwhile the initiator storage tank is connected with the reaction kettle body through an initiator feeding pipe, the right side end of the top of the reaction kettle body is connected with a magnesium chip feeding mechanism, and a magnesium chip conveying mechanism is arranged on the upper side portion of the magnesium chip feeding mechanism; the magnesium chip conveying mechanism is connected with the reaction kettle body through the magnesium chip feeding mechanism. According to the utility model, the safety problems of overspeed reaction, rapid temperature rise, material flushing and the like caused by improper addition of an initiator are solved, and the stability, the safety and the controllability of the Grignard reaction are ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of chemical production, specifically relates to a safe Grignard reaction kettle. BACKGROUND

[0002] In the field of chemical production, Grignard reagent (also known as Grignard reagent) as an important organic magnesium reagent, has been widely used in pharmaceutical intermediates, pesticide intermediates, dye intermediates and various organic synthesis. Grignard reagent is usually prepared by reacting organic halogen compounds (such as halogenated alkyl, active halogenated aromatic hydrocarbon) with magnesium in absolute anhydrous ether. However, when adding magnesium chips, the traditional Grignard reaction kettle usually needs to be opened to manually feed, which not only has high labor intensity, but also causes solvent volatilization overflow, causing damage to personnel and environment, and at the same time, a large amount of air is introduced during feeding, which adversely affects product quality and production safety.

[0003] In order to solve the air into the Grignard reaction kettle, at present, sealed feeding has been adopted, such as patent application CN117258731A - a Grignard section closed magnesium feeding device and process, which realizes the closed feeding of magnesium chips through pneumatic valve control and conical feeding tank, avoids the air entering the reaction kettle, reduces the safety risk and improves the production efficiency, and such as patent application CN209735598U - a Grignard reaction kettle provided with magnesium chip feeding device, which carries out vacuumizing, screening and static electricity removing treatment on magnesium chips through magnesium chip feeding device, so as to improve the quality of Grignard reagent and reduce the treatment cost of magnesium slag. However, the Grignard reaction kettle with magnesium chip feeding device currently solves the problem of air entering the Grignard reaction kettle, but it is difficult to recycle magnesium chips, which leads to environmental pollution and cost increase, and it is difficult to accurately control the feeding amount of initiator when adding initiator, so that the reaction of Grignard reaction kettle is unstable, and even causes safety accidents such as material overflow.

[0004] There are researches on magnesium chip recycling in the prior art, such as patent application CN208494190U - a high-efficiency and safe Grignard reaction device, which extrudes Grignard reagent through inner extension pipe, and then extrudes the precipitated magnesium chips through filter, so that the magnesium chips can be reused, solving the problem of environmental pollution and cost increase caused by the difficulty in recycling magnesium chips at present, but the existing Grignard reaction device uses the residual Grignard reagent of the previous batch as initiator, which saves the washing and drying of the kettle and nitrogen replacement operation, but the addition amount and addition speed of the initiator are still difficult to accurately control, so that the Grignard reaction kettle is still unstable during the reaction, thereby causing safety accidents such as material overflow. Therefore, a new technical scheme is needed to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] The utility model discloses a purpose lies in providing a kind of safe Grignard reaction kettle, to solve the problem that the Grignard reaction device of present stage is difficult to accurately control the adding amount and adding speed of initiator in the above background art, so that Grignard reaction kettle is still unstable in the reaction process, to cause the occurrence of safety accidents such as material rush.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of safe Grignard reaction kettle, including reactor body, the top left side end of the reactor body is penetrated with initiator feed pipe, the input end of the initiator feed pipe is connected with flow regulating mechanism and is connected with initiator storage tank by flow regulating mechanism, the initiator storage tank is set with flow regulating mechanism flow control and is simultaneously connected with reactor body by initiator feed pipe, the top right side end of the reactor body is connected with magnesium scrap feeding mechanism, the upper side of magnesium scrap feeding mechanism is equipped with magnesium scrap conveying mechanism, and the magnesium scrap conveying mechanism is connected with reactor body by magnesium scrap feeding mechanism and is connected with setting.

[0007] Further, the flow regulating mechanism includes a feed pipe, a dropwise addition pipe and a buffer tank, the top end of the buffer tank is connected with the end of the feed pipe, the first end of the feed pipe is connected to the output end of the initiator storage tank, one end of the dropwise addition pipe is connected to the lower end of the feed pipe and the other end thereof is connected with a flowmeter and is connected with the lower part of one side of the buffer tank, a feed valve is connected to the feed pipe and the dropwise addition pipe, a vacuum pipe is connected to the upper part of the other side of the buffer tank and is connected with a vacuum pumping device, a nitrogen pipe is connected to the top side end of the buffer tank and is connected with a nitrogen tank, and an electromagnetic valve is connected to the vacuum pipe and the nitrogen pipe; the bottom end of the buffer tank is connected to the first end of the initiator feed pipe, and the end of the initiator feed pipe extends from the top left side outside of the reactor body to the left side inside of the reactor body and is connected with an initiator feed valve thereon.

[0008] Further, the magnesium scrap feeding mechanism includes a hopper and a magnesium scrap feed pipe, the top end of the magnesium scrap feed pipe is connected to the bottom end of the hopper to form an integral structure, the bottom end of the magnesium scrap feed pipe is connected to the top right side end of the reactor body and is connected with a magnesium scrap feed valve thereon; a sealable cover is provided on the top of the hopper, a pressure gauge is mounted on the cover, a nitrogen delivery pipe is connected to one side wall of the hopper and is connected with a nitrogen tank, and the other side of the hopper is spaced apart from the magnesium scrap conveying mechanism.

[0009] Further, the magnesium chip feeding mechanism comprises a conveying platform located above the reaction kettle body, a conveying belt moving on the conveying platform and a feeding bin placed on the conveying belt, one end of the feeding bin is connected with a jacking cylinder and is lifted on the conveying belt through the jacking cylinder, the other end of the feeding bin is clamped on the conveying belt and an extension feeding pipe is arranged on the side wall of the feeding bin, the feeding pipe is moved to above the material port of the hopper through the moving conveying belt and is connected with the material port of the hopper through the jacking cylinder at the same time, and the feeding bin limiting sensor is arranged on the conveying platform close to the hopper.

[0010] Further, the top of the reaction kettle body is also penetrated by a solvent feeding pipe and is provided with a stirrer, a temperature sensor is fixed on the inner side wall of the reaction kettle body, a plurality of cooling coils are inlaid on the side wall of the reaction kettle body, a control panel is fixed on the outer side wall of the reaction kettle body, and the control panel is connected with the feeding valve, the electromagnetic valve, the initiator feeding valve, the magnesium chip feeding valve, the solvent feeding valve on the solvent feeding pipe, the stirrer, the conveying belt, the jacking cylinder and the openable and closable sealing cover.

[0011] Compared with the prior art, the utility model has the advantages that:

[0012] 1. The utility model discloses a initiator feeding pipe is connected with the setting of flow regulating mechanism, realizes the accurate control of initiator feeding quantity and feeding speed, ensures that initiator can enter the reaction kettle body in a stable and controllable mode, effectively avoids the safety problems such as reaction too fast, temperature rapid rise and material rush caused by improper initiator addition, thereby the safety of production and the quality stability of grignard reagent are improved significantly, and the stability, safety and controllability of grignard reaction are ensured, the closed and efficient feeding of magnesium chip is realized through the combination use of the magnesium chip feeding mechanism and the magnesium chip feeding mechanism, manual lifting feeding is not needed, the labor intensity is reduced, air is also avoided to enter the reaction kettle body, the oxygen-free environment of reaction is ensured, the quality of grignard reagent is improved, and the problem that the product quality and production safety are adversely affected is solved effectively.

[0013] 2. The utility model discloses a set up of flowmeter connected on the dropping tube, realized the accurate measurement and control of initiator flow, made the condition of format reaction get the accurate control, effectively promoted the rate of format reaction and the quality of product, adopt the design of all configuring feed valve on the feed pipe and dropping tube, make operator can according to actual demand flexible adjustment initiator delivery rate and dropping speed, thereby can respond to different reaction conditions and optimize reaction process, effectively promoted the flexibility of initiator addition, through vacuum pipe and nitrogen pipe connect the buffer tank with vacuumizing device and nitrogen tank respectively, not only can make buffer tank carry out oxygen removal under the action of nitrogen, ensure that buffer tank is always in anaerobic environment, also can make buffer tank produce negative pressure under the action of vacuum, thereby make part grignard reagent prepared in the reaction press into buffer tank as the initiator of grignard reagent next time, realized the recycling of initiator, avoided the waste of resources, the increase of cost;

[0014] 3. The utility model discloses a magnesium chip feed pipe and hopper of integrated structure design, not only simplify the installation process, still improved the structural stability of whole feeding mechanism, reduced the failure risk caused by loose or damage of connection, through setting up magnesium chip feed valve on magnesium chip feed pipe, realized the accurate control of magnesium chip into the reaction kettle ontology, help to ensure that the magnesium chip amount of adding every time all meet the process requirement, thereby improve the accuracy and consistency of reaction, through setting up the sealable seal cover of installation pressure gauge on the top of hopper, not only help frequent replacement magnesium chip or carry out equipment maintenance, also help to monitor the gas pressure in the hopper, ensure the operation safety, through nitrogen gas delivery pipe connection nitrogen tank, make hopper fill in nitrogen when necessary, to prevent magnesium chip and oxygen in the air react, reduce the risk of fire or explosion;

[0015] 4. The utility model discloses a mobile conveying belt is set up on the conveying platform, and is equipped with the feeding bin of jacking cylinder drive, realized the automatic conveying and accurate feeding of magnesium chip, not only improved production efficiency, still increased the flexibility of operation, can according to actual demand quick adjustment feeding position and feeding amount, through jacking cylinder with the material port of hopper of feeding bin is oblique setting, ensured that magnesium chip can stably, accurately fall into the hopper, avoided the scattering and waste of magnesium chip in the feeding process, improved the utilization of raw materials, through setting up feeding bin limit sensor in the position of conveying platform close to hopper, make the system can real -time monitoring the position of feeding bin, ensure that it feeds at correct time and position, not only improved the accuracy of operation, also avoided the problem of safety accident because of excessive feeding or wrong feeding;

[0016] 5.The utility model discloses a plurality of functional components (such as solvent feed pipe, agitator, temperature sensor, cooling coil pipe and the like) are integrated on the reaction kettle body, and unified control is realized in combination with the control panel, the integration degree and the automation level of equipment are improved greatly, the operation process is effectively simplified, manual intervention is reduced, production efficiency is improved, through the design of a plurality of feed pipes such as solvent feed pipe, initiator feed pipe, magnesium chip feed pipe, the reaction kettle body can flexibly handle a plurality of different types of raw materials, through controlling the corresponding valve on the control panel, the adding amount and adding opportunity of various raw materials can be realized accurate regulation, meet the demand of complex chemical reaction, through accurate temperature control, cooling management and material management and efficient stirring and conveying system, the reaction kettle body can significantly improve the efficiency of chemical reaction and the quality of product. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the whole structure schematic diagram of the utility model (omits flow regulation mechanism);

[0018] Figure 2 It is the structure schematic diagram of the reaction kettle body in Figure 1 It is the structure schematic diagram of the reaction kettle body in

[0019] Figure 3 It is the structure schematic diagram of the flow regulation mechanism connected with initiator feed pipe of the utility model;

[0020] Figure 4 It is the structure schematic diagram of the magnesium chip feed mechanism in Figure 1 Or Figure 2 It is the structure schematic diagram of the magnesium chip feed mechanism in

[0021] Figure 5 It is the structure schematic diagram of the magnesium chip feed mechanism in Figure 1 It is the structure schematic diagram of the magnesium chip feed mechanism in

[0022] Wherein: 1, reaction kettle body;2, initiator feed pipe;201, initiator feed valve;3, solvent feed pipe;301, solvent feed valve;4, agitator;5, magnesium chip feed mechanism;501, hopper;502, magnesium chip feed pipe;6, magnesium chip feed mechanism;601, conveying platform;602, conveying belt;603, feed bin;7, flow regulation mechanism;701, feed pipe;702, drop pipe;703, buffer tank;8, temperature sensor;9, cooling coil pipe;10, control panel;11, flow meter;12, feed valve;13, vacuum pipe;14, nitrogen pipe;15, electromagnetic valve;16, magnesium chip feed valve;17, sealing cover;18, pressure gauge;19, nitrogen conveying pipe;20, jacking air cylinder;21, feed pipe;22, feed bin limit sensor;23, base;24, static elimination bar;25, visual window. DETAILED DESCRIPTION

[0023] The following examples are used to further illustrate the content of the present application, and do not limit the application of the present application.

[0024] Please refer to Figures 1-5 The utility model provides a safe Grignard reaction kettle, including the reaction kettle body 1 for format reaction, the top left side end of reaction kettle body 1 is sequentially penetrated with the initiator feed pipe 2 for adding initiator and the solvent feed pipe 3 for adding solvent, the top middle position of reaction kettle body 1 is equipped with the stirrer 4 for stirring, the top right side end of reaction kettle body is connected with the magnesium scrap feeding mechanism 5 for adding magnesium scrap, the side upper portion of magnesium scrap feeding mechanism 5 is equipped with the magnesium scrap feed mechanism 6 for putting magnesium scrap to magnesium scrap feeding mechanism 5, and magnesium scrap feed mechanism 6 is connected with reaction kettle body 1 through magnesium scrap feeding mechanism 5, and the input end of initiator feed pipe 2 is connected with flow regulating mechanism 7 for accurately controlling the adding amount and adding rate and is connected with initiator storage tank (the function and structure of initiator storage tank and other conventional equipment are all known in the art, and the connection setting is also the common knowledge, so here does not make much explanation, and also not shown in the drawing) for storing initiator through flow regulating mechanism 7, and initiator storage tank is connected with flow regulating mechanism 7 flow control setting and is connected with reaction kettle body 1 through initiator feed pipe 2, and the inside wall of reaction kettle body 1 is fixed with temperature sensor 8 for detecting the temperature in the kettle, and the side wall of reaction kettle body 1 is embedded with several cooling coils 9 for keeping the safe temperature in the kettle, and the outside wall of reaction kettle body 1 is fixed with control panel 10 for control, and control panel 10 is connected with solvent feed valve 301 on the above-mentioned solvent feed pipe 3 and stirrer 4 control.

[0025] Please refer to Figures 1-3 Flow regulating mechanism 7 includes feed pipe 701 for normal feed of initiator, dropwise adding pipe 702 for dropwise adding feed of initiator and buffer tank 703 for buffering initiator, and the top end of buffer tank 703 is connected with the tail end of feed pipe 701, the head end of feed pipe 701 is connected with the output end of initiator storage tank, one end of dropwise adding pipe 702 is connected with the lower end of feed pipe 701, and the other end is connected with flow meter 11 for controlling the adding amount and is connected with the lower part of one side of buffer tank 703 through flow meter 11, and feed valve 12 is connected on feed pipe 701 and dropwise adding pipe 702;

[0026] The other side upper part of the buffer tank 703 is connected with the vacuum pipe 13 and is connected with the vacuum device (the function and structure of the conventional device are well known in the art, and the connection setting is also well known, so it is not described here, and it is not shown in the drawing) for generating negative pressure through the vacuum pipe 13; the top side end of the buffer tank 703 is connected with the nitrogen pipe 14 and is connected with the nitrogen tank (the function and structure of the conventional device are well known in the art, and the connection setting is also well known, so it is not described here, and it is not shown in the drawing) for conveying nitrogen to the buffer tank 703 through the nitrogen pipe 14, and the electromagnetic valve 15 is connected on the vacuum pipe 13 and the nitrogen pipe 14;

[0027] The bottom end of the buffer tank 703 is connected to the first end of the initiator feeding pipe 2, the end of the initiator feeding pipe 2 extends from the top left side outside of the reaction kettle body 1 to the left side inside of the reaction kettle body 1, and the initiator feeding valve 201 is connected on the end.

[0028] The above-mentioned feeding valve 12, electromagnetic valve 15 and initiator feeding valve 201 are controlled and connected with the control panel 10.

[0029] Please refer to Figures 1-2 and Figure 4 The magnesium chip feeding mechanism 5 includes a hopper 501 for receiving magnesium chips and a magnesium chip feeding pipe 502 for adding magnesium chips, the top end of the magnesium chip feeding pipe 502 is connected to the bottom end of the hopper 501 to form an integral structure, the bottom end of the magnesium chip feeding pipe 502 is connected to the top right side end of the reaction kettle body 1 and the magnesium chip feeding valve 16 is connected on the bottom end, and the inside of the hopper 501 is also provided with the static electricity elimination rod 24 for eliminating static electricity in the magnesium chips to improve safety, and the side wall of the magnesium chip feeding pipe 502 is also provided with the visual window 25 for observing the magnesium chips in the magnesium chip feeding pipe 502.

[0030] The top of the hopper 501 is provided with the sealable cover 17, the pressure gauge 18 for monitoring the pressure in the hopper 501 is installed on the sealable cover 17, one side wall of the hopper 501 is connected with the nitrogen conveying pipe 19 and is connected with the nitrogen tank through the nitrogen conveying pipe 19, and the other side of the hopper 501 is spaced apart from the magnesium chip feeding mechanism 6.

[0031] The above-mentioned magnesium chip feeding valve 16 is also controlled and connected with the control panel 10.

[0032] Please refer to Figure 1 and Figure 5The magnesium chip conveying mechanism 6 comprises a conveying platform 601 located above the reaction kettle body 1, a conveying belt 602 moving on the conveying platform 601 and a feeding bin 603 placed on the conveying belt 602, the bottom of one end of the feeding bin 603 is connected with a jacking cylinder 20 for lifting the one end of the feeding bin 603 and the feeding bin 603 is lifted on the conveying belt 602 through the jacking cylinder 20, the other end of the feeding bin 603 is clamped on the conveying belt 602 and the sidewall of the feeding bin 603 extends a feeding pipe 21 for feeding into the hopper 501, the feeding pipe 21 is moved to above the material port of the hopper 501 through the moving conveying belt 602 and is inclinedly connected with the material port of the hopper 501 through the jacking cylinder 20 at the same time, the conveying platform 601 is provided with a feeding bin limiting sensor 22 for limiting the moving position of the feeding bin 603 at the position close to the hopper;

[0033] The conveying belt 602, the jacking cylinder 20 and the openable and closable sealing cover 17 are all controlled and connected with the control panel 10.

[0034] The working principle and use process of the utility model are as follows: Figures 1-5 After the safety Grignard reaction kettle is assembled, the whole is installed on the base 23, the purpose is to realize the accurate control of the feeding amount and feeding speed of the initiator, ensure that the initiator can enter the reaction kettle body in a stable and controllable manner, effectively solve the safety problems of rapid reaction, rapid temperature rise and material flushing caused by improper addition of the initiator, thereby significantly improve the safety of production and the quality stability of Grignard reagent, ensure the stability, safety and controllability of Grignard reaction; meanwhile, the closed and efficient feeding of magnesium chips is realized, manual lifting and feeding are not needed, the labor intensity is reduced, the problem of air entering the reaction kettle body is solved, the oxygen-free environment of the reaction is ensured, the quality of Grignard reagent is improved, and the problem of adversely affecting the product quality and production safety is solved.

[0035] When the safety Grignard reactor is in use, the operator first controls the conveyor belt 602 to start moving (i.e., the conveyor belt 602 starts to move) through the control panel 10, and then clamps the bottom of one end of the internal magnesium chip-containing feeding bin 603 on the moving conveyor belt 602 and lifts the other end of the feeding bin 603 on the conveyor belt 602 through the lifting cylinder 20 (here, the conveyor belt 602 is a two-side conveyor, so that the front and rear two sides of the feeding bin 603 are respectively overlapped on the two sides of the conveyor belt 602, and the two sides of the conveyor belt 602 are left with a channel for the movement of the lifting cylinder 20), and the internal magnesium chip-containing feeding bin 603 is moved to the position (i.e., the position sensed by the feeding bin limiting sensor 22) near the hopper 501 through the conveying of the conveyor belt 602, and then the conveyor belt 602 is closed (i.e., the feeding bin 603 stops moving) through the control panel 10, and then the one end of the feeding bin 603 is lifted through the control panel 10 to control the lifting cylinder 20, so that the magnesium chips in the feeding bin 603 are poured into the hopper 501 through the feeding pipe 21 (the sealable cover 17 can be opened before feeding, and thus the magnesium chips in the feeding bin 603 are poured into the hopper 501 when the hopper 501 is in an open state), and after adding a sufficient amount of magnesium chips, the sealable cover 17 is closed through the control panel 10, and then the valve on the nitrogen conveying pipe 19 is opened, so that the nitrogen in the nitrogen tank is flushed into the hopper 501 through the nitrogen conveying pipe 19 to replace the air in the magnesium chip feeding pipe 502, prevent the magnesium chips from being partially oxidized by the air, and prevent the air in the hopper 501 from entering the reactor body 1, and after the air replacement is completed, the valve on the nitrogen conveying pipe 19 is closed, and at the same time, the feeding valve 12 on the feeding pipe 701 is opened through the control panel 10, so that the initiator previously poured into the initiator storage tank is conveyed into the buffer tank 703 through the feeding pipe 701, and then the electromagnetic valve 15 on the nitrogen pipe 14 is opened through the control panel 10, so that the nitrogen in the nitrogen tank is flushed into the buffer tank 703 through the nitrogen pipe 14 to replace the air in the buffer tank 703, and after the air replacement is completed, the electromagnetic valve 15 on the nitrogen pipe 14 is closed, and then the initiator remaining in the buffer tank 703 is directly conveyed into the initiator feeding pipe 2, and then the magnesium chip feeding valve 16, the solvent feeding valve 301, and the initiator feeding valve 201 are opened through the control panel 10, so that the magnesium chips stored in the magnesium chip feeding pipe 502, the solvent conveyed into the solvent feeding pipe 3, and the initiator stored in the initiator feeding pipe 2 are poured into the reactor body 1, and after the magnesium chips, the solvent, and the initiator are added, the magnesium chip feeding valve 16, the solvent feeding valve 301, and the initiator feeding valve 201 are closed through the control panel 10, and then the stirrer 4 is started to stir and mix the materials in the reactor body 1; during the mixing of the materials, the temperature in the reactor body 1 can also be monitored through the temperature sensor 8, and when the temperature in the reactor body 1 is too high, the reactor body 1 is cooled through the cooling coil 9, so that the internal temperature of the reactor body 1 is always maintained within a reasonable range;

[0036] When the temperature in the reactor body 1 reaches a steady state, the control panel 10 is used to open the feed valve 12 on the dropping tube 702 and the initiator feed valve 201, so that the initiator in the initiator storage tank is transported into the dropping tube 702 through the feed pipe 701 by dropping, the dropping rate is monitored by the flow meter 11, the dropping rate is adjusted by controlling the opening range of the feed valve 12 on the dropping tube 702 by the control panel 10, the initiator with the controlled dropping rate is transported into the buffer tank 703 through the dropping tube 702, then transported into the initiator feed pipe 2 through the buffer tank 703, and then dropped into the reactor body 1 through the initiator feed pipe 2, so that the Grignard preparation reaction can proceed smoothly until the reaction is completed.

[0037] When the Grignard reagent preparation reaction is completed, the control panel 10 is used to first close the stirrer 4, the feed valve 12 on the dropping tube 702 and the initiator feed valve 201, and then open the electromagnetic valve 15 on the nitrogen pipe 14, so that the nitrogen in the nitrogen tank is flushed into the buffer tank 703 through the nitrogen pipe 14 to replace the air in the buffer tank 703. After the replacement is completed, the control panel 10 is used to first close the electromagnetic valve 15 on the nitrogen pipe 14, and then open the electromagnetic valve 15 on the vacuum pipe 13 and the initiator feed valve 201, so that the inside of the buffer tank 703 generates a negative pressure under the vacuum pumping of the vacuum pumping device, so that part of the Grignard reagent in the reactor body 1 is pumped back into the buffer tank 703 through the initiator feed pipe 2, and used as the initiator for the next Grignard reagent preparation reaction.

Claims

1. A safe Grignard reaction kettle comprising a kettle body, a initiator feeding pipe is penetrated through the top left side end of the kettle body, characterized in that, The input end of the initiator feeding pipe is connected with a flow regulating mechanism and an initiator storage tank through the flow regulating mechanism, the initiator storage tank is arranged in flow regulating mode with the flow regulating mechanism and is arranged in connection with the reaction kettle body through the initiator feeding pipe, the top right end of the reaction kettle body is connected with a magnesium chip feeding mechanism, the upper side of the magnesium chip feeding mechanism is provided with a magnesium chip feeding mechanism, and the magnesium chip feeding mechanism is arranged in connection with the reaction kettle body through the magnesium chip feeding mechanism.

2. The safe Grignard reaction kettle according to claim 1, wherein, The flow regulating mechanism comprises a feeding pipe, a dropwise adding pipe and a buffer tank, the top end of the buffer tank is arranged in connection with the tail end of the feeding pipe, and the head end of the feeding pipe is connected with the output end of the initiator storage tank.

3. The safe Grignard reaction kettle according to claim 2, wherein, One end of the dropwise adding pipe is connected with the lower end of the feeding pipe, the other end of the dropwise adding pipe is connected with a flow meter and arranged in connection with the lower side of the buffer tank through the flow meter, the upper side of the other side of the buffer tank is connected with a vacuum pipe and connected with a vacuumizing device through the vacuum pipe, and the top side end of the buffer tank is connected with a nitrogen pipe and connected with a nitrogen tank through the nitrogen pipe.

4. The safe Grignard reaction kettle according to claim 3, characterized in that, The feeding pipes and the dropwise adding pipes are all connected with feeding valves, and the vacuum pipes and the nitrogen pipes are all connected with electromagnetic valves.

5. The safe Grignard reaction kettle according to claim 3, wherein, The bottom end of the buffer tank is connected with the head end of the initiator feeding pipe, the tail end of the initiator feeding pipe extends from the top left side outside of the reaction kettle body to the left side inside of the reaction kettle body and is connected with an initiator feeding valve thereon.

6. The safe Grignard reaction kettle according to claim 1, wherein The magnesium chip feeding mechanism comprises a hopper and a magnesium chip feeding pipe, the top end of the magnesium chip feeding pipe is connected with the bottom end of the hopper to form an integrated structure, the bottom end of the magnesium chip feeding pipe is connected with the top right end of the reaction kettle body and is connected with a magnesium chip feeding valve thereon.

7. The safe Grignard reaction kettle according to claim 6, wherein The top of the hopper is provided with an openable and closable sealing cover, a pressure gauge is mounted on the sealing cover, a nitrogen conveying pipe is connected with one side wall of the hopper and connected with a nitrogen tank through the nitrogen conveying pipe, and the other side of the hopper is arranged in spaced mode with the magnesium chip feeding mechanism.

8. The safe Grignard reaction kettle according to claim 7, wherein, The magnesium chip feeding mechanism comprises a conveying platform above the reaction kettle body, a conveying belt moving on the conveying platform and a feeding bin on the conveying belt, the bottom of one end of the feeding bin is connected with a jacking cylinder and lifted on the conveying belt through the jacking cylinder, the other end of the feeding bin is clamped on the conveying belt and the side wall of the feeding bin extends with a feeding pipe, the feeding pipe is moved to above the material port of the hopper through the moving conveying belt and is connected with the material port of the hopper in inclined mode through the jacking cylinder.

9. The safe Grignard reaction kettle according to claim 8, wherein, A feeding bin limiting sensor is arranged on the conveying platform close to the hopper.

10. The safe Grignard reaction kettle according to claim 1, wherein The top of the reaction kettle body is also penetrated with a solvent feeding pipe and mounted with a stirrer, a temperature sensor is fixed on the inner side wall of the reaction kettle body, a plurality of cooling coils are inlaid on the side wall of the reaction kettle body, a control panel is fixed on the outer side wall of the reaction kettle body, and the control panel is arranged in control connection with the feeding valves, the electromagnetic valves, the initiator feeding valve, the magnesium chip feeding valve, the solvent feeding valve on the solvent feeding pipe, the stirrer, the conveying belt, the jacking cylinder and the openable and closable sealing cover.

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