A continuous feeding stirring device for benzoin synthesis reaction

Abstract

The utility model relates to stirring device technical field, and disclose a kind of continuous feeding stirring device for benzoin synthesis reaction, including reaction mechanism, and the feeding structure is installed on reaction mechanism, inlet pipe is connected with constant-temperature storage tank by filter piece, at this time, start metering pump, cooperate inlet pipe and extract sodium cyanide solution in constant-temperature storage tank, and impurity and air bubble in sodium cyanide solution are filtered out by filter screen in filter cover, utilize drain pipe to enter reaction mechanism, reduce the risk that air bubble enters metering pump and causes unstable flow, realize continuous feeding, and corrosion-resistant layer of cooperation setting can play the role of corrosion resistance, reduce the influence of solution to connecting pipe A and connecting pipe B, one end of inlet pipe is inserted into connecting pipe B, one end of communicating pipe is inserted into connecting pipe A, and sealing is carried out with sealing gasket, so that inlet pipe and constant-temperature storage tank are connected and sealed with filter piece, prevent gas from entering, effectively reduce the formation of air bubble.

Description

Technical Field

[0001] This utility model relates to the technical field of stirring devices, specifically a continuous feeding stirring device for benzoin synthesis reaction. Background Technology

[0002] The synthesis of benzoin involves the condensation reaction of benzaldehyde with benzoin under the catalysis of sodium cyanide. This reaction process requires the cooperation of a reaction vessel and a feeding and stirring device to achieve continuous supply of reactants, thorough mixing, and efficient catalytic reaction, thereby improving the product yield and reaction efficiency.

[0003] The reaction principle of benzoin synthesis: When benzaldehyde reacts with sodium cyanide, sodium cyanide provides cyanide ions, which react with benzaldehyde to form benzaldehyde cyanide intermediate, which is then converted into benzoin. This reaction is usually called cyanation reaction or cyanation reaction of aromatic compounds. In the benzoin synthesis reaction, in order to avoid the reaction being too violent, sodium cyanide can be added to the reaction system by continuous feeding. In the benzoin synthesis reaction, sodium cyanide dissolved in solvent is usually added to the reaction vessel by metering pump. However, when metering pumps add sodium cyanide solution, the solution contains volatile substances that easily generate bubbles. These bubbles affect the feed flow rate, resulting in uneven feed and affecting subsequent reactions. Utility Model Content

[0004] The purpose of this invention is to provide a continuous feeding and stirring device for benzoin synthesis reaction, so as to solve the problem mentioned in the background art that the solution contains volatile substances, which easily generate bubbles, and the bubbles affect the feeding flow rate, resulting in uneven feeding.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a continuous feeding and stirring device for benzoin synthesis reaction, comprising a reaction mechanism, wherein a feeding structure is installed on the reaction mechanism, and the feeding structure is used to continuously feed sodium cyanide solution; The feeding structure includes a metering pump and an inlet pipe connected to the metering pump. A filter element is connected to the end of the inlet pipe away from the metering pump, and a constant temperature storage tank is connected to the lower end of the filter element. The constant temperature storage tank is used to store sodium cyanide solution. A drain pipe is also connected to the metering pump. The end of the drain pipe away from the metering pump extends into the reaction mechanism. When the metering pump is started, it works with the inlet pipe to draw sodium cyanide solution from the constant temperature storage tank. Impurities and air bubbles in the sodium cyanide solution are filtered out by the filter element, and the solution enters the reaction mechanism through the drain pipe to achieve continuous feeding.

[0006] Preferably, the lower end of the metering pump is equipped with a mounting base, which is fixed to the reaction mechanism by bolts. The metering pump is a plunger flow pump with the model number Pulsafeeder Series, which can provide precise flow control.

[0007] Preferably, the outer walls of both the drain pipe and the inlet pipe are coated with a heat insulation layer, and the drain pipe and the inlet pipe are made of polytetrafluoroethylene material.

[0008] Preferably, the reaction mechanism includes a reaction vessel and a drive unit mounted on the reaction vessel. A shaft is installed inside the reaction vessel, and the drive unit is connected to the top end of the shaft. The shaft is driven to rotate by the drive unit. Several stirring rods are evenly distributed on the outer side of the shaft. A discharge pipe is connected to the bottom side wall of the reaction vessel.

[0009] Preferably, the constant temperature storage box has an opening on its surface, a connecting pipe is inserted into the opening, and the inner wall of the connecting pipe is uniformly coated with a corrosion-resistant layer.

[0010] Preferably, the filter element includes a filter cover and a connecting pipe A connected to the bottom of the filter cover. The top end of the connecting pipe is inside the connecting pipe A. The upper end of the connecting pipe A is connected to a connecting pipe B. One end of the liquid inlet pipe is inserted into the connecting pipe B. A filter screen for filtration is embedded inside the filter cover. Sealing gaskets are embedded on the inner walls of the connecting pipe A and the connecting pipe B, and the sealing gaskets play a sealing role.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. Through the set reaction mechanism and feeding structure, the sodium cyanide solution in the constant temperature storage tank is drawn into the reaction mechanism by the metering pump, the inlet pipe and the outlet pipe. The impurities and air bubbles in the sodium cyanide solution are filtered out by the filter element to achieve continuous feeding. The reaction mechanism is used for stirring to reduce the risk of air bubbles entering the metering pump and causing unstable flow.

[0012] 2. By using the sealing gasket, connecting pipe A and connecting pipe B, the connection between the liquid inlet pipe and the constant temperature storage box and the filter element can be sealed with the sealing gasket, preventing gas from entering and effectively reducing the formation of bubbles. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model; Figure 2 This is a three-dimensional structural diagram of the reaction mechanism of this utility model; Figure 3 This is a three-dimensional structural diagram of the feeding structure of this utility model; Figure 4 For the present utility model Figure 3 Enlarged 3D structural diagram at point A.

[0014] In the diagram: 1. Reaction mechanism; 11. Reaction vessel; 12. Drive component; 13. Shaft; 14. Stirring rod; 15. Discharge pipe; 2. Feeding structure; 21. Metering pump; 211. Mounting base; 22. Drain pipe; 23. Inlet pipe; 231. Insulation layer; 24. Constant temperature storage box; 241. Opening; 242. Connecting pipe; 243. Corrosion resistant layer; 25. Filter element; 251. Filter cover; 252. Connecting pipe A; 253. Connecting pipe B; 254. Filter screen; 255. Sealing gasket. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1: Please refer to Figures 1-4 A continuous feeding and stirring device for benzoin synthesis reaction includes a reaction mechanism 1 and a feeding structure 2. The feeding structure 2 is located on the reaction mechanism 1 and is used to continuously feed sodium cyanide solution. The reaction mechanism 1 is used for stirring to facilitate the benzoin synthesis reaction. The feeding structure 2 includes a metering pump 21 and an inlet pipe 23 connected to the metering pump 21. The end of the inlet pipe 23 away from the metering pump 21 is connected to a filter element 25. The lower end of the filter element 25 is connected to a constant temperature storage tank 24, which is used to store sodium cyanide solution. The metering pump 21 is also connected to a drain pipe 22. The end of the drain pipe 22 away from the metering pump 21 extends into the reaction mechanism 1. When the metering pump 21 is started, it works with the inlet pipe 23 to draw sodium cyanide solution from the constant temperature storage tank 24. The filter element 25 filters out impurities and air bubbles in the sodium cyanide solution, and the solution enters the reaction mechanism 1 through the drain pipe 22, realizing continuous feeding and reducing the risk of air bubbles entering the metering pump 21 and causing unstable flow.

[0017] The lower end of the metering pump 21 is equipped with a mounting base 211, which is fixed to the reaction mechanism 1 by means of bolts. The metering pump 21 is a plunger flow pump structure, and the model of the metering pump 21 is Pulsafeeder Series. The metering pump 21 can provide precise flow control.

[0018] Both the outer walls of the drain pipe 22 and the inlet pipe 23 are coated with a heat insulation layer 231. The drain pipe 22 and the inlet pipe 23 are made of polytetrafluoroethylene material, which plays a role in resisting chemical corrosion.

[0019] The reaction mechanism 1 includes a reaction container 11 and a drive component 12 mounted on the reaction container 11. A shaft 13 is installed inside the reaction container 11, and the drive component 12 is connected to the top end of the shaft 13. Several stirring rods 14 are evenly distributed on the outer side of the shaft 13. A discharge pipe 15 is connected to the bottom side wall of the reaction container 11. The shaft 13 is driven to rotate by the drive component 12, which in turn drives the stirring rods 14 to rotate, thereby stirring the solution inside the reaction container 11.

[0020] An opening 241 is provided on the surface of the constant temperature storage box 24, and a connecting pipe 242 is inserted into the opening 241. The inner wall of the connecting pipe 242 is uniformly coated with a corrosion-resistant layer 243.

[0021] The filter element 25 includes a filter cover 251 and a connecting pipe A252 connected to the bottom of the filter cover 251. The top end of the connecting pipe 242 is inside the connecting pipe A252. The upper end of the connecting pipe A252 is connected to the connecting pipe B253. One end of the liquid inlet pipe 23 is inserted into the connecting pipe B253. The filter cover 251 is fitted with a filter screen 254 for filtration. The inner walls of the connecting pipe A252 and the connecting pipe B253 are also coated with a corrosion-resistant layer 243.

[0022] In this embodiment: the inlet pipe 23 is connected to the constant temperature storage tank 24 through the filter element 25. At this time, the metering pump 21 is started, and the sodium cyanide solution in the constant temperature storage tank 24 is drawn out in conjunction with the inlet pipe 23. The impurities and air bubbles in the sodium cyanide solution are filtered out by the filter screen 254 in the filter cover 251. The solution is then discharged into the reaction mechanism 1 through the drain pipe 22, which reduces the risk of air bubbles entering the metering pump 21 and causing unstable flow, thus achieving continuous feeding. The corrosion-resistant layer 243 can also play a role in corrosion resistance, reducing the impact of the solution on the connecting pipes A252 and B253.

[0023] Example 2: This example is an improvement on Example 1. For details, please refer to [link / reference]. Figure 4 A sealing gasket 255 is embedded on the inner wall of the connecting pipe A252 and the connecting pipe B253. The sealing gasket 255 plays a sealing role, so that the connecting pipe B253 and the liquid inlet pipe 23 are sealed with the connecting pipe A252 and the connecting pipe 242 to prevent air from entering.

[0024] In this embodiment: During the process, one end of the liquid inlet pipe 23 is inserted into the connecting pipe B253, and one end of the connecting pipe 242 is inserted into the connecting pipe A252, and is sealed with the sealing gasket 255, so that the liquid inlet pipe 23 and the constant temperature storage box 24 are connected and sealed with the filter element 25, preventing gas from entering and effectively reducing the formation of bubbles.

[0025] It should be noted that the plunger flow pump provides a stable liquid flow rate through the reciprocating motion of the plunger, and features precise control and high pressure resistance. It is not an innovative part of this application document, but is common knowledge. Those skilled in the art are capable of conceiving of the specific structure and structural layout.

[0026] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0027] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A continuous feeding and stirring device for benzoin synthesis reaction, comprising a reaction mechanism (1), characterized in that: The reaction mechanism (1) is equipped with a feeding structure (2), which is used to continuously feed sodium cyanide solution. The feeding structure (2) includes a metering pump (21) and an inlet pipe (23) connected to the metering pump (21). The end of the inlet pipe (23) away from the metering pump (21) is connected to a filter element (25). The lower end of the filter element (25) is connected to a constant temperature storage box (24), which is used to store sodium cyanide solution. The metering pump (21) is also connected to a drain pipe (22), and the end of the drain pipe (22) away from the metering pump (21) extends into the reaction mechanism (1).

2. The continuous feeding and stirring device for benzoin synthesis reaction according to claim 1, characterized in that: The metering pump (21) is equipped with a mounting base (211) at its lower end, and the metering pump (21) is a plunger flow pump structure.

3. The continuous feeding and stirring device for benzoin synthesis reaction according to claim 1, characterized in that: The outer walls of the drain pipe (22) and the inlet pipe (23) are coated with a heat insulation layer (231), and the drain pipe (22) and the inlet pipe (23) are made of polytetrafluoroethylene material.

4. The continuous feeding and stirring device for benzoin synthesis reaction according to claim 1, characterized in that: The reaction mechanism (1) includes a reaction container (11) and a drive unit (12) installed on the reaction container (11). A shaft (13) is installed inside the reaction container (11), and the drive unit (12) is connected to the top of the shaft (13). Several stirring rods (14) are evenly distributed on the outside of the shaft (13), and a discharge pipe (15) is connected to the bottom side wall of the reaction container (11).

5. The continuous feeding and stirring device for benzoin synthesis reaction according to claim 1, characterized in that: The constant temperature storage box (24) has an opening (241) on its surface, and a connecting pipe (242) is inserted into the opening (241). The inner wall of the connecting pipe (242) is uniformly coated with a corrosion-resistant layer (243).

6. The continuous feeding and stirring device for benzoin synthesis reaction according to claim 5, characterized in that: The filter element (25) includes a filter cover (251) and a connecting pipe A (252) connected to the bottom of the filter cover (251). The top end of the connecting pipe (242) is inside the connecting pipe A (252). The upper end of the connecting pipe A (252) is connected to the connecting pipe B (253). One end of the liquid inlet pipe (23) is inserted into the connecting pipe B (253). The filter cover (251) is fitted with a filter screen (254) for filtration. The inner walls of the connecting pipe A (252) and the connecting pipe B (253) are fitted with sealing gaskets (255).

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