Efficient continuous production device for preparing Grignard reagent

Abstract

The invention relates to the technical field of chemical equipment, in particular to an efficient continuous production device for preparing a Grignard reagent. The magnesium powder reaction device comprises a reaction pipe, a magnesium feeding bin and a discharging port are arranged on the two sides of the reaction pipe, a feeding pipe is arranged at the bottom of the magnesium feeding bin, a supporting plate is arranged on the top of the reaction pipe, and a stirring assembly is arranged on the surface of the reaction pipe. The raw material liquid mixed with magnesium powder nearby is sucked, magnesium powder particles are locally circulated through the leakage holes in the reaction process, the included angle between the leakage holes and the horizontal plane is 30 degrees, so that the magnesium powder moves upwards in the vertical direction when being thrown out through the leakage holes, and the magnesium powder is always in a suspended state and is fully mixed with the raw material liquid; the Grignard preparation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of chemical equipment technology, and in particular to a highly efficient continuous production apparatus for preparing Grignard reagents. Background Technology

[0002] A Grignard reactor is a device used to prepare Grignard reagents, which are generally prepared by a chemical reaction between an organohalogen compound and metallic magnesium. The chemical principle is that magnesium atoms are directly bonded to carbon chains, and under the influence of polarization, the carbon atoms exhibit negative electrical charge. The reaction process requires an anhydrous and oxygen-free environment and precise temperature control.

[0003] There are many existing technologies for Grignard reaction devices, such as: Chinese invention patent CN212068771U discloses a continuous preparation apparatus and system for Grignard reagents. The apparatus includes a columnar reactor and an oscillation source. The columnar reactor comprises a reaction column and a jacket disposed outside the reaction column. The jacket is used to introduce a temperature-controlled medium to control the temperature of the reaction column. The lower part of the reaction column has an inlet for haloalkanes as raw materials, and the upper part has an inlet for magnesium and an outlet for Grignard reagent products. The oscillation source is connected to the bottom end of the reaction column. This apparatus can achieve continuous and efficient mixing and reaction of haloalkanes as raw materials and metallic magnesium, offering advantages such as shortened reaction time and the ability to obtain high concentrations of Grignard reagents. Simultaneously, this apparatus avoids the problem of rapid pressure rise within the reaction apparatus caused by the violent exothermic reaction process, as seen in traditional reaction apparatuses. It also avoids the instability of reaction conditions and the impact on reaction progress caused by excessive pressure within the reaction apparatus, greatly increasing the safety of the apparatus and improving the quality of the Grignard reagent product.

[0004] However, some problems still exist in actual use: 1. Traditional equipment uses a direct feeding method for magnesium powder. During the falling process, magnesium powder is easily formed into loose pre-agglomerates due to electrostatic adsorption between particles, slight compression and friction of the inner wall of the pipe. After entering the raw material liquid, the internal magnesium powder particles are tightly wrapped by the outer particles and cannot fully contact the haloalkane solution, resulting in a significant decrease in the utilization rate of magnesium powder. 2. Magnesium powder tends to settle quickly to the bottom of the reaction tube under the influence of gravity, forming local accumulation. This settling phenomenon will cause a sharp reduction in the contact area between the solid and liquid phases in the reaction tube, resulting in a significant decrease in the reaction rate. Summary of the Invention

[0005] In order to overcome the above-mentioned defects in the prior art, the present invention provides an efficient continuous production apparatus for preparing Grignard reagents.

[0006] To achieve the above objectives, the present invention aims to provide a highly efficient continuous production apparatus for preparing Grignard reagents, comprising a reaction tube, a magnesium feeding hopper and a discharge port on both sides of the reaction tube, a feed pipe at the bottom of the magnesium feeding hopper, the feed pipe being connected to the reaction tube, a metering valve being provided between the magnesium feeding hopper and the feed pipe, the feed pipe at the bottom of the reaction tube for introducing raw material liquid, and a heating assembly on the surface of the reaction tube, the heating assembly including a first heater and a second heater, the first heater and the second heater being sequentially sleeved on the reaction tube along its height direction. On the outer wall of the tube, below the first heater and the second heater, a first thermometer and a second thermometer are respectively provided. The heating temperature of the first heater is higher than that of the second heater. A support plate is provided on the top of the reaction tube. A stirring assembly is provided on the surface of the reaction tube. The stirring assembly is used to stir and mix the raw material liquid and magnesium powder in the reaction tube. A feeding assembly is provided near the bottom of the feed pipe. The feeding assembly is used to disperse and sieve the magnesium powder to make the magnesium powder evenly fed. A vibration assembly is provided below the feeding assembly. The vibration assembly taps the bottom of the feeding assembly to make all the magnesium powder fall into the raw material liquid.

[0007] Furthermore, the stirring assembly includes a servo motor located at the bottom of the support plate. The output end of the servo motor passes through the support plate and has a main belt shaft at its end. A secondary belt shaft is located on one side of the main belt shaft. A transmission belt is provided between the main belt shaft and the secondary belt shaft. A main shaft is clamped to the center of the secondary belt shaft. The main shaft rotates inside the reaction tube.

[0008] Furthermore, the main shaft surface is provided with centrifugal fan blades, which are respectively disposed inside the reaction tubes heated by the first heater and the second heater.

[0009] Furthermore, each centrifugal fan blade is provided with a sloping plate above it. The sloping plate is shaped like a pedestal and has an extension cover at the bottom. The centrifugal fan blade rotates inside the extension cover. The surface of the extension cover has a leakage hole, which forms a 30° angle with the horizontal plane.

[0010] Furthermore, the main shaft is hollow with an open top, and the internal temperature of the reaction tube can be adjusted by injecting oil into it during the preparation of Grignard preparations.

[0011] Furthermore, the feeding assembly includes a guide plate located below the feed pipe. The guide plate has a top-opening sloping shape, and a groove is provided below the guide plate. A screening plate is provided at the bottom of the groove.

[0012] Furthermore, the surface of the screening disc is provided with a lever, which is fixed to the surface of the main shaft and rotates coaxially with it.

[0013] Furthermore, the vibration assembly includes a main gear disposed on the surface of the main shaft, with secondary gears meshing on both sides of the main gear, a connecting rod at the end of the secondary gear, and striking balls disposed on the surface of the connecting rod. When the main gear rotates, it strikes the bottom of the screening disc.

[0014] Furthermore, the striking ball is made of rubber and deforms when it impacts the bottom of the screening disc.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this efficient continuous production device for preparing Grignard reagents, the output shaft of the control servo motor drives the main belt shaft to rotate. When the main belt shaft rotates, it drives the auxiliary belt shaft to rotate through the transmission belt. When the auxiliary belt shaft rotates, it drives the main shaft to rotate coaxially. Since the surface of the main shaft is equipped with centrifugal fan blades, the shear force and turbulence effect during the rotation of the centrifugal fan blades allow the raw material liquid to fully contact the magnesium powder, update the reaction interface on the magnesium surface in real time, and quickly remove the products on the surface, greatly improving the raw material conversion rate and reaction rate.

[0016] 2. In this efficient continuous production device for preparing Grignard reagents, during the magnesium powder reaction, the centrifugal fan blades rotate inside the extension hood to create a negative pressure, which draws in the raw material liquid mixed with magnesium powder. This allows the magnesium powder particles to circulate locally through the leak during the reaction. Since the leak is at a 30° angle to the horizontal plane, the magnesium powder moves upward in the vertical direction when it is thrown out through the leak, thus keeping the magnesium powder in a suspended state and fully mixing with the raw material liquid, thereby improving the efficiency of Grignard reagent preparation.

[0017] 3. In this efficient continuous production device for preparing Grignard reagents, magnesium powder falls onto the surface of a sieve disc via a guide plate. The sieve disc filters impurities from the magnesium powder. During the feeding of magnesium powder, the main shaft drives the centrifugal fan blades to rotate, and the lever rotates coaxially with the main shaft. During the rotation of the lever, the magnesium powder falling onto the surface of the sieve disc is agitated, causing it to fall evenly from the surface of the sieve disc, thereby preventing the magnesium powder from accumulating when passing through the feed pipe and maintaining the controllability of the reaction system. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram at point A; Figure 4 This is a partial schematic diagram of the stirring assembly of the present invention; Figure 5 This is a cross-sectional view of the feeding assembly of the present invention; Figure 6 This is a schematic diagram of the vibration component structure of the present invention.

[0020] The meanings of the labels in the diagram are as follows: 100. Reaction tube; 101. Magnesium feeding hopper; 102. Metering valve; 103. Feed pipe; 104. Halogenated hydrocarbon feed inlet; 105. Discharge port; 106. Support plate; 200. Heating assembly; 201. First heater; 202. Second heater; 203. First thermometer; 204. Second thermometer; 300. Stirring assembly; 301. Servo motor; 302. Main belt shaft; 303. Secondary belt shaft; 304. Drive belt; 305. Main shaft; 306. Centrifugal fan blades; 307. Inclined plate; 308. Extension cover; 309. Leakage hole; 400. Feeding assembly; 401. Guide plate; 402. Groove; 403. Screening plate; 404. Lever; 500, Vibration assembly; 501, Main gear; 502, Secondary gear; 503, Connecting rod; 504, Striking ball. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] A highly efficient continuous production apparatus for preparing Grignard reagents, according to Figure 1-6As shown, the reaction tube 100 includes a magnesium feeding hopper 101 and a discharge port 105 on both sides of the reaction tube 100. A feed pipe 103 is located at the bottom of the magnesium feeding hopper 101, and the feed pipe 103 is connected to the reaction tube 100. A metering valve 102 is located between the magnesium feeding hopper 101 and the feed pipe 103. The feed pipe 103 is used to introduce raw material liquid. A heating assembly 200 is provided on the surface of the reaction tube 100. The heating assembly 200 includes a first heater 201 and a second heater 202. The first heater 201 and the second heater 202 are sequentially sleeved on the outer wall of the reaction tube 100 along its height direction. Below the second heater 202, a first thermometer 203 and a second thermometer 204 are respectively provided. The heating temperature of the first heater 201 is higher than that of the second heater 202. A support plate 106 is provided on the top of the reaction tube 100. A stirring assembly 300 is provided on the surface of the reaction tube 100. The stirring assembly 300 is used to stir and mix the raw material liquid and magnesium powder in the reaction tube 100. A feeding assembly 400 is provided near the bottom of the feed pipe 103. The feeding assembly 400 is used to disperse and sieve the magnesium powder so that the magnesium powder is fed evenly. A vibration assembly 500 is provided below the feeding assembly 400. The vibration assembly 500 taps the bottom of the feeding assembly 400 so that all the magnesium powder falls into the raw material liquid.

[0023] The Grignard reagent formation reaction is a solid-liquid two-phase reaction. Without stirring, the liquid phase raw material can only contact the surface of the magnesium powder, while the internal magnesium powder particles are encapsulated and cannot participate in the reaction. At the same time, the Grignard reagent generated by the reaction will adhere to the magnesium surface to form a "passivation layer," hindering the subsequent reaction from continuing. Therefore, the stirring assembly 300 includes a servo motor 301 located at the bottom of the support plate 106. The output end of the servo motor 301 passes through the support plate 106 and has a main belt shaft 302 at its end. A secondary belt shaft 303 is located on one side of the main belt shaft 302. A transmission belt 304 is provided between the main belt shaft 302 and the secondary belt shaft 303. A main shaft 305 is clamped to the center of the secondary belt shaft 303. The main shaft 305 rotates inside the reaction tube 100, and centrifugal fan blades 306 are provided on the surface of the main shaft 305. Centrifugal fan blades 306 are respectively installed inside the reaction tubes 100 heated by the first heater 201 and the second heater 202. During the preparation of Grignard reagent, magnesium material is quantitatively fed through the metering valve 102 and mixed with the raw material liquid. The output shaft of the servo motor 301 is controlled to drive the main belt shaft 302 to rotate. When the main belt shaft 302 rotates, it drives the auxiliary belt shaft 303 to rotate through the transmission belt 304. When the auxiliary belt shaft 303 rotates, it drives the main shaft 305 to rotate coaxially. Since the surface of the main shaft 305 is provided with centrifugal fan blades 306, the rotation of the centrifugal fan blades 306 allows the raw material liquid to fully contact the magnesium powder through shear force and turbulence effect, updates the reaction interface on the magnesium surface in real time, and quickly removes the surface products, greatly improving the raw material conversion rate and reaction rate.

[0024] During the stirring process of magnesium powder, due to gravity, the magnesium powder tends to fall to the bottom of the reaction tube 100 during the preparation of Grignard reagent, affecting the efficiency of Grignard reagent preparation. Therefore, a sloping plate 307 is provided above each centrifugal fan blade 306. The sloping plate 307 is frustum-shaped, and an extension cover 308 is provided at the bottom of the sloping plate 307. The centrifugal fan blade 306 rotates inside the extension cover 308. The surface of the extension cover 308 has a drain hole 309, which is at a 30° angle to the horizontal plane. During the falling of magnesium powder, the rotation of the centrifugal fan blade 306 inside the extension cover 308 creates a negative pressure inside, which draws in the raw material liquid mixed with magnesium powder, so that the magnesium powder particles are concentrated in the reaction process. The magnesium powder is partially circulated through the perforation 309. Since the perforation 309 is at a 30° angle to the horizontal plane, the magnesium powder is thrown out through the perforation 309 and moves upward in the vertical direction, so that the magnesium powder is always in a suspended state and fully mixed with the raw material liquid, improving the efficiency of Grignard preparation. At the same time, when the raw material liquid mixed with magnesium powder is constantly circulating between the extension cover 308 and the reaction tube 100, the contact probability between the magnesium powder and the centrifugal fan blade 306 is increased. The centrifugal fan blade 306 collides with the magnesium powder particles, causing the molten magnesium in the reaction to adhere to the surrounding magnesium powder particles and break them up, preventing the magnesium powder from reacting and falling to the bottom of the reaction tube 100, thereby improving the preparation efficiency.

[0025] During the preparation of Grignard reagents, the reaction of magnesium material is exothermic. To prevent excessive heat from causing material spraying due to overheating inside the reaction tube 100, the main shaft 305 is hollow with an open top. When preparing Grignard reagents, the internal temperature of the reaction tube 100 can be adjusted by injecting hot or cold oil into it. The internal temperature of the reaction tube 100 is measured in real time by the first thermometer 203 and the second thermometer 204. If the displayed temperature is higher than the set temperature, cold oil is injected into the reaction tube 100 to cool it down quickly. If the displayed temperature is lower than the set temperature, hot oil is injected into the reaction tube 100 to heat it up quickly, thereby improving the reaction efficiency.

[0026] The reaction between magnesium powder and haloalkanes is a strongly exothermic reaction. If the local reaction rate is too fast in the initial stage of feeding, the local temperature will rise sharply. After the oxide film on the surface of the magnesium powder is destroyed, the exposed elemental magnesium may melt locally due to the high temperature. The molten magnesium will adhere to the surrounding magnesium powder particles to form clumps. Therefore, the feeding assembly 400 includes a guide plate 401 located below the feed pipe 103. The guide plate 401 is sloping with an open top. A groove 402 is provided below the guide plate 401. A screening plate 403 is provided at the bottom of the groove 402. A lever 404 is provided on the surface of the screening plate 403. The lever 404 is fixed to the surface of the main shaft 305 and rotates coaxially with it. When the metering valve 102 is opened... During the feeding process into the reaction tube 100, magnesium powder falls onto the surface of the sieve plate 403 through the guide plate 401. The sieve plate 403 filters impurities in the magnesium powder. During the feeding process, when the main shaft 305 drives the centrifugal fan blade 306 to rotate, the lever 404 rotates coaxially with the main shaft 305. During the rotation of the lever 404, it moves the magnesium powder falling onto the surface of the sieve plate 403, so that it falls evenly from the surface of the sieve plate 403. This avoids the magnesium powder from accumulating when it passes through the feed pipe 103, which would cause the molten magnesium to stick to the surrounding magnesium powder particles and form clumps. This ensures that the magnesium powder enters the reactor at a uniform and stable rate, maintaining the controllability of the reaction system.

[0027] During the preparation of Grignard reagent, when magnesium powder passes through the through holes on the surface of the sieve disc 403, the magnesium powder forms loose pre-agglomerates due to electrostatic adsorption and slight compression during its descent. This causes the through holes on the surface of the sieve disc 403 to become blocked, resulting in insufficient magnesium powder feeding and affecting the Grignard reaction. Therefore, the vibration assembly 500 includes a main gear 501 mounted on the surface of the main shaft 305, with secondary gears 502 meshing on both sides of the main gear 501. A connecting rod 503 is located at the end of the secondary gear 502, and striking balls 504 are mounted on the surface of the connecting rod 503. When the main gear 501 rotates, it strikes the bottom of the sieve disc 403. The striking balls 504 are made of rubber and strike the bottom of the sieve disc 403. When impacted, the main shaft 305 deforms. During the preparation of Grignard reagent, the rotation of the main shaft 305 drives the main gear 501 to rotate coaxially. The rotation of the main gear 501 drives the secondary gear 502 to mesh and rotate. The rotation of the secondary gear 502 drives the connecting rod 503 to rotate coaxially. The rotation of the connecting rod 503 drives the striking ball 504 to move coaxially. During the rotation, the striking ball 504 strikes the bottom of the sieve disk 403. During the striking process, the striking ball 504 bends and deforms, thereby achieving repeated vibration of the bottom of the sieve disk 403. This causes the magnesium material blocking the through holes of the sieve disk 403 to fall off, thus ensuring the accuracy of magnesium material measurement during the preparation of Grignard reagent and ensuring the reaction effect.

[0028] In practical use, raw material liquid is injected into the reaction tube 100 through the halogenated hydrocarbon raw material inlet 104, and magnesium powder is fed into the reaction tube 100 through the metering valve 102. The output shaft of the servo motor 301 is controlled to drive the main belt shaft 302 to rotate. When the main belt shaft 302 rotates, it drives the auxiliary belt shaft 303 to rotate through the transmission belt 304. When the auxiliary belt shaft 303 rotates, it drives the main shaft 305 to rotate coaxially. Since the surface of the main shaft 305 is equipped with centrifugal fan blades 306, the centrifugal fan blades 306 rotate during the process of shearing force and turbulence effect, so that the raw material liquid and magnesium powder can fully contact each other, update the reaction interface on the magnesium surface in real time, and quickly remove the products on the surface, which greatly improves the raw material conversion rate and reaction rate. During the magnesium powder reaction, the centrifugal fan blade 306 rotates inside the extension shroud 308, creating a negative pressure inside. This draws in the raw material liquid mixed with magnesium powder, causing the magnesium powder particles to circulate locally through the perforation 309 during the reaction. Since the perforation 309 is at a 30° angle to the horizontal plane, the magnesium powder moves upward vertically when it is thrown out through the perforation 309, keeping the magnesium powder suspended and fully mixed with the raw material liquid, thus improving the efficiency of the Grignard preparation. At the same time, when the raw material liquid mixed with magnesium powder is constantly circulating between the extension shroud 308 and the reaction tube 100, the contact probability between the magnesium powder and the centrifugal fan blade 306 is increased. The centrifugal fan blade 306 collides with the magnesium powder particles, causing the molten magnesium in the reaction to adhere to the surrounding magnesium powder particles and break them up, preventing the magnesium powder from accumulating and falling to the bottom of the reaction tube 100, thereby improving the preparation efficiency. The internal temperature of the reaction tube 100 is measured in real time by the first thermometer 203 and the second thermometer 204. If the displayed temperature is higher than the set temperature, cool oil is injected into the reaction tube 100 to cool it down quickly. If the displayed temperature is lower than the set temperature, hot oil is injected into the reaction tube 100 to heat it up quickly, thereby improving the reaction efficiency. When metering valve 102 is opened to feed material into reaction tube 100, magnesium powder falls onto the surface of screening plate 403 through guide plate 401. The screening plate 403 filters impurities in the magnesium powder. During the feeding process, when the main shaft 305 drives the centrifugal fan blade 306 to rotate, the lever 404 rotates coaxially with the main shaft 305. During the rotation of the lever 404, it moves the magnesium powder falling onto the surface of screening plate 403, so that it falls evenly from the surface of screening plate 403. This prevents the magnesium powder from clumping together when it passes through feed pipe 103, which would cause the molten magnesium to stick to the surrounding magnesium powder particles and form clumps. This ensures that the magnesium powder enters the reactor at a uniform and stable rate, maintaining the controllability of the reaction system. When the main shaft 305 rotates, it drives the main gear 501 to rotate coaxially. When the main gear 501 rotates, it drives the secondary gear 502 to mesh and rotate. When the secondary gear 502 rotates, it drives the connecting rod 503 to rotate coaxially. When the connecting rod 503 rotates, it drives the striking ball 504 to move coaxially. During the rotation, the striking ball 504 strikes the bottom of the sieve disc 403. During the striking process, the striking ball 504 bends and deforms, thereby achieving repeated vibration of the bottom of the sieve disc 403, causing the magnesium material blocked in the through hole of the sieve disc 403 to fall off. This ensures the accuracy of magnesium material measurement during the preparation of Grignard reagent, thereby ensuring the reaction effect. After the reaction is completed, the Grignard reagent product is extracted through the discharge port 105.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A highly efficient continuous production apparatus for preparing Grignard reagents, characterized in that: The reaction tube (100) includes a magnesium feeding hopper (101) and a discharge port (105) on both sides. A feed pipe (103) is located at the bottom of the magnesium feeding hopper (101), and the feed pipe (103) is connected to the reaction tube (100). A metering valve (102) is located between the magnesium feeding hopper (101) and the feed pipe (103). A heating assembly (200) is provided on the surface of the reaction tube (100). The heating assembly (200) includes a first heater (201) and a second heater (202). The first heater (201) and the second heater (202) are sequentially fitted onto the outer wall of the reaction tube (100) along its height direction. Below the heater (201) and the second heater (202), a first thermometer (203) and a second thermometer (204) are respectively provided. The heating temperature of the first heater (201) is higher than that of the second heater (202). A support plate (106) is provided on the top of the reaction tube (100). A stirring assembly (300) is provided on the surface of the reaction tube (100). The stirring assembly (300) is used to stir and mix the raw material liquid and magnesium powder in the reaction tube (100). A feeding assembly (400) is provided near the bottom of the feed pipe (103). The feeding assembly (400) is used to disperse and sieve the magnesium powder so that the magnesium powder is fed evenly. A vibration assembly (500) is provided below the feeding assembly (400). The vibration assembly (500) taps the bottom of the feeding assembly (400) so that all the magnesium powder falls into the raw material liquid.

2. The efficient continuous production apparatus for preparing Grignard reagents according to claim 1, characterized in that, The stirring assembly (300) includes a servo motor (301) located at the bottom of the support plate (106). The output end of the servo motor (301) passes through the support plate (106) and is provided with a main belt shaft (302) at its end. A secondary belt shaft (303) is provided on one side of the main belt shaft (302). A transmission belt (304) is provided between the main belt shaft (302) and the secondary belt shaft (303). A main shaft (305) is clamped at the center of the secondary belt shaft (303). The main shaft (305) rotates inside the reaction tube (100).

3. The efficient continuous production apparatus for preparing Grignard reagents according to claim 2, characterized in that, The surface of the main shaft (305) is provided with centrifugal fan blades (306), which are respectively disposed inside the reaction tube (100) heated by the first heater (201) and the second heater (202).

4. The efficient continuous production apparatus for preparing Grignard reagents according to claim 3, characterized in that, Each centrifugal fan blade (306) is provided with a ramp (307) above it. The ramp (307) is shaped like a pedestal. An extension cover (308) is provided at the bottom of the ramp (307). The centrifugal fan blade (306) rotates inside the extension cover (308). A drain hole (309) is opened on the surface of the extension cover (308). The drain hole (309) forms a 30° angle with the horizontal plane.

5. The efficient continuous production apparatus for preparing Grignard reagents according to claim 4, characterized in that, The main shaft (305) is hollow with an open top. When preparing Grignard preparations, the internal temperature of the oil reaction tube (100) can be adjusted by injecting oil into it.

6. The efficient continuous production apparatus for preparing Grignard reagents according to claim 1, characterized in that, The feeding assembly (400) includes a guide plate (401) located below the feed pipe (103). The guide plate (401) is a top-opening sloping plate. A groove (402) is provided below the guide plate (401), and a screening plate (403) is provided at the bottom of the groove (402).

7. The efficient continuous production apparatus for preparing Grignard reagents according to claim 6, characterized in that, The surface of the screening disc (403) is provided with a lever (404), which is fixed to the surface of the main shaft (305) and rotates coaxially with it.

8. The efficient continuous production apparatus for preparing Grignard reagents according to claim 1, characterized in that, The vibration assembly (500) includes a main gear (501) disposed on the surface of the main shaft (305), and auxiliary gears (502) meshing on both sides of the main gear (501). A connecting rod (503) is provided at the end of the auxiliary gear (502), and a striking ball (504) is provided on the surface of the connecting rod (503). When the main gear (501) rotates, it strikes the bottom of the screening disc (403).

9. The efficient continuous production apparatus for preparing Grignard reagents according to claim 8, characterized in that, The striking ball (504) is made of rubber and deforms when it impacts the bottom of the screening disc (403).

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