Acetonitrile production and purification equipment

Abstract

The utility model discloses acetonitrile production purification equipment which comprises a purification tank body, a cover plate is arranged at the top of the purification tank body, a stirring motor is mounted on the cover plate, and a flow guide ring is sleeved at the top of the side surface of the purification tank body; a fixed disc is arranged in an inner cavity of the purification tank body, collecting pipes are annularly communicated with the interior of the inner cavity of the fixed disc at equal intervals, one end of each collecting pipe is communicated with a discharging pipe, the end, away from the collecting pipes, of each discharging pipe is communicated with a flow guide ring, a one-way valve is installed on a pipe body, and one side of each flow guide ring is communicated with a discharging pipe; according to the device, the first collecting tank and the second collecting tank can be used for collecting liquid acetonitrile purified in the purification tank body, the first collecting tank and the second collecting tank do not influence each other, and when one collecting tank is replaced, the other collecting tank can continuously work, so that the situation that the production rate is reduced due to shutdown is avoided, and the production efficiency is improved. The purification efficiency of acetonitrile can be ensured to the greatest extent.

Description

Technical Field

[0001] This utility model relates to the technical field of acetonitrile production equipment, specifically to an acetonitrile production and purification equipment. Background Technology

[0002] Acetonitrile needs to be purified during production.

[0003] Chinese patent application CN202323200049.5 discloses an acetonitrile production and purification device, which includes: "a main tank, a heating tank below the main tank, support legs fixedly mounted on the outside of the heating tank, a waste liquid output pipe at the bottom of the main tank, an upper mounting plate above the main tank, two feed inlets on the upper mounting plate, the feed inlets extending through into the interior of the main tank, and a sealing plug rotatably connected above the feed inlets. This acetonitrile production and purification device utilizes the property that dichloromethane is slightly soluble in water and miscible with acetonitrile to purify crude acetonitrile. It avoids the drawbacks of many existing technologies that use a crude acetonitrile-crude distillation-calcium chloride water absorption process, which ultimately produces a large amount of difficult-to-recycle solid waste. This not only reduces environmental pollution but also reduces the enterprise's waste disposal costs after production, improving economic efficiency."

[0004] Through a search of the aforementioned patented technologies, we found that the patent still has certain shortcomings:

[0005] On the one hand, when the amount of liquid acetonitrile distilled from the main tank exceeds the volume of the collection tank, the collection tank may be unable to collect more liquid acetonitrile. In this case, it may be necessary to stop the equipment and replace the collection tank before restarting. This will cause equipment downtime and reduce production efficiency. On the other hand, when the amount of acetonitrile vapor inside the tank is large, due to the tank sidewall where the outlet is located, the acetonitrile vapor that cannot enter the outlet in time will accumulate inside and at the top of the tank. Because the discharge efficiency of acetonitrile vapor is low, it will directly affect the subsequent formation efficiency of liquid acetonitrile. Utility Model Content

[0006] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an acetonitrile production and purification device, comprising a purification tank, a cover plate on the top of the purification tank, a stirring motor mounted on the cover plate, and a guide ring fitted on the top side of the purification tank; a fixed disc is provided in the inner cavity of the purification tank, and a collection pipe is connected in a ring at equal intervals in the inner cavity of the fixed disc, one end of the collection pipe is connected to a discharge pipe, the end of the discharge pipe away from the collection pipe is connected to the guide ring and a one-way valve is installed on the pipe body, a discharge pipe is connected to one side of the guide ring, a guide pipe is connected to one end of the discharge pipe, and the two ends of the guide pipe are respectively connected to a collection tank one and a collection tank two; heating plates are fixed in a ring at equal intervals on the inner wall of the purification tank, and an electric heating tube is provided inside each heating plate.

[0008] As a further embodiment of this utility model: a flow guiding cavity is provided in the inner cavity of the flow guiding ring, the end of the discharge pipe away from the collection pipe passes through the purification tank and the flow guiding ring in sequence and communicates with the flow guiding cavity, and the end of the collection pipe away from the discharge pipe passes through to the bottom of the fixed disc and communicates with the inner cavity of the purification tank.

[0009] As a further embodiment of this utility model: the power output shaft of the stirring motor movably passes through the cover plate and is fixed with a stirring rod; the power output shaft of the stirring rod movably passes through the fixed disc and is placed in the inner cavity of the purification tank; multiple stirring blades are fixed on the rod body; diversion ports are equidistantly opened on the stirring blades; and multiple diversion rods are equidistantly fixed on the inner wall of the diversion ports.

[0010] As a further embodiment of this utility model: the stirring rod and the multiple stirring blades are located inside the multiple heating plates.

[0011] As a further embodiment of this utility model: a solenoid valve is installed on the body of the discharge pipe, a condenser is connected to the end of the discharge pipe away from the guide ring, a liquid outlet pipe is connected to the output end of the condenser, a guide pipe is connected to the end of the liquid outlet pipe away from the condenser, and a solenoid valve is installed on the body of the guide pipe for controlling the liquid inlet of the second collection tank and a solenoid valve for controlling the liquid inlet of the first collection tank.

[0012] As a further embodiment of this utility model: four heating plates are provided in the inner cavity of the purification tank, and the bottom of the four heating plates is close to the inner bottom wall of the purification tank. The bottom of the purification tank is connected to a waste discharge pipe, and a valve is provided on the waste discharge pipe.

[0013] As a further embodiment of this utility model: the side wall of the purification tank is also connected to a feed pipe one and a feed pipe two. The end of the feed pipe one placed in the inner cavity of the purification tank is located between two heating plates, and the end of the feed pipe two placed in the inner cavity of the purification tank is also located between two heating plates.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] I. In this application, through the designed structure of guide ring, discharge pipe, guide pipe, collection tank one and collection tank two, the liquid acetonitrile purified in the purification tank can be collected by collection tank one and collection tank two respectively. The two do not affect each other. When one collection tank is replaced, the other collection tank can continue to work, thereby avoiding the decline in productivity due to downtime and maximizing the purification efficiency of acetonitrile.

[0016] Second, in this application, through the designed structure of fixed disc, multiple collection pipes, multiple discharge pipes, and guide ring, the acetonitrile vapor generated during the purification process can directly enter multiple collection pipes after rising, and then enter the guide ring through the collection pipes, and finally be quickly discharged through the guide ring. This method can accelerate the discharge speed of acetonitrile vapor, avoid the accumulation of acetonitrile vapor in the tank, and avoid the acetonitrile vapor re-mixing with the materials in the tank, thereby effectively improving the efficiency of subsequent liquid acetonitrile formation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0018] Figure 2 This is a side sectional view of the purification tank of this utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the heating plate of this utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of the stirring blade of this utility model;

[0021] Figure 5 This is a top sectional view of the purification tank of this utility model.

[0022] The reference numerals and names in the figure are as follows:

[0023] 1. Purification tank; 2. Cover plate; 3. Stirring motor; 301. Stirring rod; 302. Stirring blade; 3021. Diverter port; 3022. Diverter rod; 4. Guide ring; 401. Guide cavity; 5. Feed pipe one; 6. Feed pipe two; 7. Discharge pipe; 701. Solenoid valve one; 8. Condenser; 9. Liquid outlet pipe; 10. Guide pipe; 1001. Solenoid valve two; 1002. Solenoid valve three; 11. Collection tank one; 12. Collection tank two; 13. Fixed disc; 14. Heating plate; 15. Electric heating tube; 16. Collection pipe; 17. Discharge pipe; 18. Check valve. Detailed Implementation

[0024] 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.

[0025] Please see Figure 1-5 An acetonitrile production and purification device includes a purification tank 1. A cover plate 2 is provided on the top of the purification tank 1, and a stirring motor 3 is installed on the cover plate 2. A guide ring 4 is fitted onto the top side of the purification tank 1. A fixed disc 13 is provided in the inner cavity of the purification tank 1. A sealing structure, such as a rubber sealing ring, can be provided at the connection between the fixed disc 13 and the inner wall of the purification tank 1 to improve sealing. Collection pipes 16 are connected in a ring at equal intervals within the inner cavity of the fixed disc 13. One end of the collection pipe 16 is connected to a discharge pipe 17. The end of the discharge pipe 17 away from the collection pipe 16 is connected to the guide ring 4, and a one-way valve 18 is installed on the pipe. A one-way valve 18 is installed on the discharge pipe 17 to prevent the acetonitrile vapor entering the guide ring 4 from flowing back. One side of the guide ring 4 is connected to the discharge pipe 7, and one end of the discharge pipe 7 is connected to the guide pipe 10. The two ends of the guide pipe 10 are respectively connected to the first collection tank 11 and the second collection tank 12. The connection between the first collection tank 11, the second collection tank 12 and the guide pipe 10 can be butt joint, and a sealing ring is set at the joint to facilitate the subsequent removal of the first collection tank 11 or the second collection tank 12. Heating plates 14 are fixed in a ring at equal intervals on the inner wall of the purification tank 1. Each heating plate 14 is equipped with an electric heating tube 15 inside.

[0026] Please see Figure 1 and Figure 2 In this embodiment, a flow guide cavity 401 is provided in the inner cavity of the flow guide ring 4. The end of the discharge pipe 17 away from the collection pipe 16 passes through the purification tank 1 and the flow guide ring 4 in sequence and is connected to the flow guide cavity 401. The end of the collection pipe 16 away from the discharge pipe 17 passes through to the bottom of the fixed disc 13 and is connected to the inner cavity of the purification tank 1.

[0027] Specifically, the collection pipe 16 can be a flexible tube for easy bending, while the discharge pipe 17 can be a rigid tube for easy connection with the guide ring 4. A sealing structure, such as a rubber sealing ring or sealant, can be provided at the connection between the discharge pipe 17 and the guide ring 4 to ensure the sealing of the connection.

[0028] Please see Figure 1 , Figure 2 and Figure 4In this embodiment, the power output shaft of the stirring motor 3 movably passes through the cover plate 2 and is fixed with a stirring rod 301. The power output shaft of the stirring rod 301 movably passes through the fixed disc 13 and is placed in the inner cavity of the purification tank 1. Multiple stirring blades 302 are fixed on the rod body of the stirring rod 301. Diversion ports 3021 are equidistantly opened on the stirring blades 302. Multiple diversion rods 3022 are equidistantly fixed on the inner wall of the diversion ports 3021. The stirring rod 301 and the multiple stirring blades 302 are located inside the multiple heating plates 14.

[0029] Specifically, when the stirring motor 3 starts, it drives the stirring rod 301 to rotate through its power output shaft, thereby driving the multiple stirring blades 302 on the stirring rod 301 to rotate, thus agitating the materials in the tank and making them evenly mixed. The stirring blades 302 also have a diversion port 3021, which allows the materials to enter easily from the diversion port 3021 and dispersed by multiple diversion rods 3022, thereby avoiding material aggregation and improving the mixing efficiency of dichloromethane and crude acetonitrile.

[0030] Please see Figure 1 and Figure 2 In this embodiment, a solenoid valve 701 is installed on the body of the discharge pipe 7. The end of the discharge pipe 7 away from the guide ring 4 is connected to a condenser 8. The output end of the condenser 8 is connected to a liquid outlet pipe 9. The end of the liquid outlet pipe 9 away from the condenser 8 is connected to a guide pipe 10. A solenoid valve 1001 for controlling the liquid inlet of the collection tank 12 and a solenoid valve 1002 for controlling the liquid inlet of the collection tank 11 are installed on the body of the guide pipe 10.

[0031] Specifically, the discharge pipe 7 has a solenoid valve 701 to control the gas output, which can be easily adjusted according to the actual situation. The guide pipe 10 has a solenoid valve 1001 and a solenoid valve 1002. By opening or closing the solenoid valves 1001 and 1002, the flow direction of liquid acetonitrile can be specified, so that the collection tank 12 and the collection tank 11 can collect liquid acetonitrile respectively, which can facilitate the replacement of the collection tank 12 and the collection tank 11 without stopping the machine.

[0032] Please see Figure 1 and Figure 2 In this embodiment, four heating plates 14 are provided in the inner cavity of the purification tank 1. The bottom of each of the four heating plates 14 is close to the inner bottom wall of the purification tank 1. A waste discharge pipe is connected to the bottom of the purification tank 1, and a valve is provided on the waste discharge pipe.

[0033] Specifically, the four heating plates 14 can directly heat the material inside the tank, and when the material is stirred and flows inside the tank, it can continuously contact the heating plates 14, increasing the heating area and efficiency of the material, thereby accelerating the formation of acetonitrile vapor. The bottom of the purification tank 1 is connected to a waste discharge pipe, and a valve is installed on the waste discharge pipe to facilitate the subsequent discharge of waste materials from the purification tank 1.

[0034] Please see Figure 1 and Figure 2 In this embodiment, the side wall of the purification tank 1 is also connected to a feed pipe 5 and a feed pipe 6. The end of the feed pipe 5 located in the inner cavity of the purification tank 1 is located between two heating plates 14. The end of the feed pipe 6 located in the inner cavity of the purification tank 1 is also located between two heating plates 14.

[0035] Specifically, feed pipe 5 and feed pipe 6 are connected to the dichloromethane conveying equipment and the crude acetonitrile conveying equipment, respectively, which can conveniently convey the required dichloromethane and crude acetonitrile into the purification tank 1, making it convenient to use. Feed pipe 5 and feed pipe 6 are located between two different heating plates 14, which facilitates material discharge and avoids falling onto the heating plates 14.

[0036] When using:

[0037] Dichloromethane and crude acetonitrile are introduced into the purification tank 1 through feed pipe 5 and feed pipe 6 respectively. Then, the stirring motor 3 is started, and the stirring blade 302 is driven to rotate by the stirring motor 3 to fully stir the materials inside the purification tank 1.

[0038] The electric heating tube 15 activates the heating plate 14 to heat the material inside the purification tank 1. The resulting acetonitrile vapor rises and directly enters the collection pipe 16. Through multiple collection pipes 16, the acetonitrile vapor is guided into the guide ring 4, then discharged through the discharge pipe 7, and then enters the condenser 8 for condensation into liquid acetonitrile. It then enters the liquid outlet pipe 9 and the guide pipe 10. Since the second solenoid valve 1001 is closed and the third solenoid valve 1002 is open at this time, the liquid acetonitrile will enter the first collection tank 11. After a certain amount of liquid acetonitrile has been collected in the first collection tank 11, the third solenoid valve 1002 can be closed and the second solenoid valve 1001 can be opened, allowing the liquid acetonitrile to enter the second collection tank 12. The first collection tank 11 can then be removed from the guide pipe 10 for replacement. In this way, the first collection tank 11 and the second collection tank 12 can continuously collect liquid acetonitrile, avoiding downtime and ultimately improving the purification efficiency of acetonitrile.

[0039] It should be noted that the condenser 8 is a common device on the market that converts gas or vapor into liquid. It is a publicly available technical feature and has been described in the published patent with patent number CN202323200049.5. Therefore, it is not repeated in this specification.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An acetonitrile production and purification device, characterized in that, The purification tank (1) includes a top cover plate (2) and a stirring motor (3) installed on the top cover plate (2). A guide ring (4) is fitted on the top side of the purification tank (1). The purification tank (1) has a fixed disc (13) in its inner cavity. The fixed disc (13) has collection pipes (16) connected in a ring at equal intervals in its inner cavity. One end of the collection pipe (16) is connected to a discharge pipe (17). The end of the discharge pipe (17) away from the collection pipe (16) is connected to a guide ring (4) and a one-way valve (18) is installed on the pipe. One side of the guide ring (4) is connected to a discharge pipe (7). One end of the discharge pipe (7) is connected to a guide pipe (10). The two ends of the guide pipe (10) are respectively connected to a collection tank one (11) and a collection tank two (12). The inner wall of the purification tank (1) is fixed with heating plates (14) in a ring at equal intervals, and each heating plate (14) is equipped with an electric heating tube (15).

2. The acetonitrile production and purification equipment according to claim 1, characterized in that, The inner cavity of the guide ring (4) is provided with a guide cavity (401). The end of the discharge pipe (17) away from the collection pipe (16) passes through the purification tank (1) and the guide ring (4) in sequence and is connected to the guide cavity (401). The end of the collection pipe (16) away from the discharge pipe (17) passes through to the bottom of the fixed disc (13) and is connected to the inner cavity of the purification tank (1).

3. The acetonitrile production and purification equipment according to claim 1, characterized in that, The power output shaft of the stirring motor (3) movably passes through the cover plate (2) and is fixed with a stirring rod (301). The power output shaft of the stirring rod (301) movably passes through the fixed disc (13) and is placed in the inner cavity of the purification tank (1). Multiple stirring blades (302) are fixed on the rod body of the stirring rod (301). Diversion ports (3021) are equidistantly opened on the stirring blades (302). Multiple diversion rods (3022) are equidistantly fixed on the inner wall of the diversion port (3021).

4. The acetonitrile production and purification equipment according to claim 3, characterized in that, The stirring rod (301) and multiple stirring blades (302) are located inside the multiple heating plates (14).

5. The acetonitrile production and purification equipment according to claim 1, characterized in that, The discharge pipe (7) is equipped with a solenoid valve 1 (701). The end of the discharge pipe (7) away from the guide ring (4) is connected to a condenser (8). The output end of the condenser (8) is connected to a liquid outlet pipe (9). The end of the liquid outlet pipe (9) away from the condenser (8) is connected to a guide pipe (10). The guide pipe (10) is equipped with a solenoid valve 2 (1001) for controlling the liquid inlet of the collection tank 2 (12) and a solenoid valve 3 (1002) for controlling the liquid inlet of the collection tank 1 (11).

6. The acetonitrile production and purification equipment according to claim 1, characterized in that, Four heating plates (14) are provided in the inner cavity of the purification tank (1). The bottom of each of the four heating plates (14) is close to the inner bottom wall of the purification tank (1). The bottom of the purification tank (1) is connected to a waste discharge pipe, and a valve is provided on the waste discharge pipe.

7. The acetonitrile production and purification equipment according to claim 1, characterized in that, The side wall of the purification tank (1) is also connected to a feed pipe one (5) and a feed pipe two (6). The feed pipe one (5) is located between two heating plates (14) in the inner cavity of the purification tank (1). The feed pipe two (6) is also located between two heating plates (14) in the inner cavity of the purification tank (1).

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