High-efficiency reaction kettle for lithium hexafluorophosphate production

Abstract

This application relates to the field of lithium hexafluorophosphate production technology, specifically disclosing a high-efficiency reactor for lithium hexafluorophosphate production. The reactor includes a reactor body and a stirring shaft positioned at the center of the reactor body. A motor is fixedly connected to the top of the stirring shaft. A circular opening is formed at the center of the top of the reactor body, and a flange seal connects to an air inlet cylinder extending into the reactor body. A channel is formed at the center of the top of the air inlet cylinder, through which the stirring shaft extends into the bottom of the reactor body, forming an air inlet chamber between the stirring shaft and the air inlet cylinder. An air inlet pipe is provided at the top of the reactor body, extending into the reactor body, with its end penetrating the air inlet cylinder and communicating with the air inlet chamber. Gas is transported from top to bottom along the air inlet chamber into the reactor to participate in the reaction, resulting in a long residence time of the reactant gas in the reactor, thus ensuring that most of the gas participates in the reaction and improving reaction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of lithium hexafluorophosphate production technology, specifically to a high-efficiency reaction vessel for lithium hexafluorophosphate production. Background Technology

[0002] Lithium hexafluorophosphate (LiPF6) is currently the most widely used electrolyte salt in commercial lithium-ion batteries. With the rapid development of the electronics industry and the continued expansion of the new energy field, the demand for high-performance batteries is increasing, and the market demand for LiPF6 will show a rapid growth trend. Its chemical formula is LiPF6. It is a white crystal or powder, easily soluble in water, and also soluble in low-concentration organic solvents such as methanol, ethanol, acetone, and carbonates.

[0003] The existing production method for lithium hexafluorophosphate involves first introducing an anhydrous HF solution of LiF or an organic solvent suspension of LiF into a reactor, then introducing PF5 gas into the reactor for stirring and reaction. Subsequent processes include crystallization, separation, and drying to obtain the LiPF6 product. To improve the efficiency of the gas-liquid reaction, Chinese utility model patent CN218901840U discloses a reactor with an air inlet device. By setting an air inlet channel on the stirring device that connects external air to the interior of the reactor body, external air is introduced while the stirring device is stirring the reaction inside the reactor body. This allows oxygen in the air to fully contact the reaction liquid and undergo an oxidation reaction, further improving the efficiency of the oxidation reaction. Because the stirring shaft of this reactor is hollow and serves as an air inlet, and the stirring paddle is mounted on the main shaft with several air outlets, when this reactor is used to prepare lithium hexafluorophosphate, the introduced LiF, HF, and PF5 are corrosive. The interior of the stirring shaft and paddle will be in direct contact with the material. When performing anti-corrosion treatment, the entire stirring shaft and paddle must be disassembled, and the interior of the stirring shaft and paddle must be flushed and maintained. The internal space of the stirring shaft is small, and there are many blind spots for cleaning inside the paddle, which makes the operation complicated and costly. Moreover, the hollow structure may weaken the strength and rigidity of the stirring shaft, increasing the risk of deformation and breakage when it is rotating at high speed or under heavy load, thus shortening the service life of the stirring shaft. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency reactor for lithium hexafluorophosphate production, which solves the problems of complex and costly disassembly and cleaning of existing high-efficiency reactors during anti-corrosion treatment, and the hollow structure weakening the strength and rigidity of the stirring shaft, thus shortening its service life.

[0005] To address the above issues, the following technical solution is provided:

[0006] A high-efficiency reactor for lithium hexafluorophosphate production includes a reactor body and a stirring shaft located in the center of the reactor body. A motor is fixedly connected to the top of the stirring shaft. A circular opening is provided at the center of the top of the reactor body. An air inlet cylinder extending into the reactor body is flange-sealed at the circular opening. A channel is provided at the center of the top of the air inlet cylinder. The stirring shaft extends into the bottom of the reactor body through the channel. An air inlet chamber is formed between the stirring shaft and the air inlet cylinder. An air inlet pipe is provided at the top of the reactor body and extends into the reactor body. The end of the air inlet pipe extending into the reactor body passes through the air inlet cylinder and communicates with the air inlet chamber.

[0007] The basic principle of the above technical solution is as follows: the reaction gas for preparing lithium hexafluorophosphate is transported into the gas inlet chamber through the gas inlet pipe, and the gas is transported from top to bottom into the reaction vessel to participate in the reaction. At the same time, the stirring shaft is driven by the motor to stir.

[0008] The beneficial effects of the above technical solution are as follows:

[0009] 1. Compared with the existing reactors that have a hollow stirring shaft and use the stirring shaft as an air inlet, this technical solution has an air inlet cylinder on the outer periphery of the stirring shaft. When performing anti-corrosion treatment, the air inlet cylinder can be directly removed from the reactor for rinsing. The air inlet cylinder has a large internal space and no blind spots for cleaning, which is convenient for cleaning and saves water.

[0010] 2. An air intake chamber is formed between the air intake cylinder and the stirring shaft to transport the reaction gas, preventing the inside of the stirring shaft from coming into contact with the reaction gas and thus being rapidly corroded, thereby extending the service life of the stirring shaft.

[0011] 3. The gas is transported from top to bottom along the gas inlet chamber into the reactor to participate in the reaction, which makes the gas stay in the reactor for a long time, so that most of the gas can participate in the reaction and improve the reaction efficiency.

[0012] Furthermore, the intake pipe is divided into multiple branch pipes, each with its end connected to the intake chamber in a different direction. These branch pipes can deliver reactant gases into the intake chamber from multiple directions, allowing the reactant gases to rapidly diffuse within the chamber and participate in the reaction within the reactor.

[0013] Furthermore, the air inlet end of the air inlet pipe is connected to a defoaming device. The reaction gas introduced into the air inlet pipe will first be filtered by the defoaming device to prevent the reaction gas from carrying bubbles, which would affect the reaction efficiency.

[0014] Furthermore, the inner wall of the air inlet cylinder is provided with several guide plates, which are evenly arranged from top to bottom on the inner wall of the air inlet cylinder. The guide plates can add and guide the reaction gas in the gas chamber to the lower part of the reaction vessel to participate in the reaction.

[0015] Furthermore, a spiral stirring blade is fixedly connected to the stirring shaft below the air inlet cylinder, and the spiral stirring blade has several evenly arranged through holes. The rotation of the stirring shaft drives the spiral stirring blade to rotate, stirring the reactants. The through holes on the spiral stirring blade can break the single rotation mode of the fluid around the stirring blade and guide the fluid to form a more complex flow path. This helps to reduce eddies and dead zones in the reactor, ensuring that the materials are mixed more evenly in the reactor.

[0016] Furthermore, an upwardly curved, arc-shaped stirring claw is fixedly connected to the bottom of the stirring shaft. When rotating, the upwardly curved arc-shaped stirring claw can more effectively push the material to form an axial flow along the stirring shaft. This flow pattern helps to break the stratification of the material at the bottom of the reactor, avoid the accumulation of material at the bottom of the reactor, and achieve more uniform mixing and more efficient reaction. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram of the reaction vessel of this utility model.

[0018] The reference numerals in the accompanying drawings of the instruction manual include: 1. Reactor body; 2. Stirring shaft; 3. Motor; 4. Air inlet; 5. Air chamber; 6. Drain plate; 7. Air inlet pipe; 8. Defogging device; 9. Branch pipe; 10. Spiral stirring blade; 11. Through hole; 12. Stirring claw; 13. Feed inlet; 14. Air outlet; 15. Discharge outlet. Detailed Implementation

[0019] The following detailed description illustrates the specific implementation method:

[0020] The basic implementation examples are as follows: Figure 1 As shown:

[0021] A high-efficiency reactor for lithium hexafluorophosphate production, such as Figure 1As shown, the reactor includes a reactor body 1 and a stirring shaft 2 located in the center of the reactor body 1. A motor 3 is fixedly connected to the top of the stirring shaft 2. A circular opening is provided in the center of the top of the reactor body 1. An air inlet cylinder 4 extending into the reactor body 1 is connected to the circular opening by a flange seal. A channel is provided in the center of the top of the air inlet cylinder 4. The stirring shaft 2 extends into the bottom of the reactor body 1 through the channel. An annular sealing ring is embedded between the stirring shaft 2 and the channel. The sealing ring can ensure the sealing of the connection between the stirring shaft 2 and the air inlet cylinder 4 and prevent air leakage from the top of the air inlet cylinder 4. An air inlet chamber 5 is formed between the stirring shaft 2 and the air inlet cylinder 4. Several guide plates 6 are provided on the inner wall of the air inlet cylinder 4. The several guide plates 6 are evenly arranged from top to bottom on the inner wall of the air inlet cylinder 4. The reactor body 1 has an air inlet pipe 7 at its top, with a defoaming device 8 connected to the inlet end of the air inlet pipe 7. The outlet 14 of the air inlet pipe 7 splits into two branch pipes 9, which extend into the reactor body 1. The ends of the two branch pipes 9 pass through the air inlet cylinder 4 from the left and right directions, respectively, and connect to the air inlet chamber 5. A spiral stirring blade 10 is welded onto the stirring shaft 2, located below the air inlet cylinder 4. Several evenly arranged through holes 11 are formed on the spiral stirring blade 10. An upwardly curved, arc-shaped stirring claw 12 is welded to the bottom of the stirring shaft 2. The reactor body 1 has a feed inlet 13 and an air outlet 14 at its top, and a discharge outlet 15 at its bottom. Both the feed inlet 13 and the discharge outlet 15 are equipped with valves.

[0022] The specific implementation process is as follows:

[0023] The reaction gas for preparing lithium hexafluorophosphate is transported into the inlet chamber 5 through the inlet pipe 7. The gas then flows downwards through the inlet chamber 5 into the reactor to participate in the reaction, while the stirring shaft 2 is driven by the motor 3 for stirring. An inlet cylinder 4 is installed around the stirring shaft 2. For corrosion protection, the inlet cylinder 4 can be directly removed from the reactor for rinsing. The inlet cylinder 4 has a large internal space and no blind spots for cleaning, making cleaning convenient and water-saving. The inlet chamber 5, formed between the inlet cylinder 4 and the stirring shaft 2, transports the reaction gas, preventing the inside of the stirring shaft 2 from contacting the reaction gas and thus avoiding rapid corrosion, extending the service life of the stirring shaft 2. The reaction gas flows downwards through the inlet chamber 5 into the reactor to participate in the reaction. Because the inlet cylinder 4 surrounds the reaction gas, the gas remains in the reactor for a long time, preventing it from rapidly escaping from the reaction liquid and flowing out of the outlet. This ensures that most of the gas participates in the reaction, improving reaction efficiency.

[0024] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A high-efficiency reactor for the production of lithium hexafluorophosphate, comprising a reactor body and a stirring shaft disposed at the center of the reactor body, wherein a motor is fixedly connected to the top of the stirring shaft, characterized in that: The reactor body has a circular opening at the top center, and a flange seal is connected to an air inlet cylinder extending into the reactor body. The air inlet cylinder has a channel at the top center, through which the stirring shaft extends into the bottom of the reactor body. An air inlet chamber is formed between the stirring shaft and the air inlet cylinder. The reactor body has an air inlet pipe at the top end that extends into the reactor body, and the end of the air inlet pipe that extends into the reactor body passes through the air inlet cylinder and communicates with the air inlet chamber.

2. The high-efficiency reaction vessel for lithium hexafluorophosphate production according to claim 1, characterized in that: The intake pipe is divided into multiple branch pipes, and the ends of the multiple branch pipes are connected to the intake chamber in different directions.

3. The high-efficiency reaction vessel for lithium hexafluorophosphate production according to claim 2, characterized in that: The air inlet end of the air inlet pipe is connected to a defoaming device.

4. The high-efficiency reaction vessel for lithium hexafluorophosphate production according to claim 3, characterized in that: The inner wall of the air intake cylinder is provided with several guide plates, which are evenly arranged from top to bottom on the inner wall of the air intake cylinder.

5. The high-efficiency reaction vessel for lithium hexafluorophosphate production according to claim 4, characterized in that: The stirring shaft is fixedly connected to a spiral stirring blade located below the air inlet cylinder, and the spiral stirring blade has several evenly arranged through holes.

6. The high-efficiency reaction vessel for lithium hexafluorophosphate production according to claim 5, characterized in that: The bottom of the stirring shaft is fixedly connected to an upwardly curved, arc-shaped stirring claw.

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