A lithium hexafluorophosphate continuous synthesis apparatus

Abstract

The application relates to the technical field of lithium hexafluorophosphate production, and particularly discloses a lithium hexafluorophosphate continuous synthesis equipment which comprises a transversely arranged reaction bin, a gas inlet pipe and a liquid inlet pipe are arranged at the upper portion of the left end of the reaction bin, the gas inlet pipe extends and transversely penetrates through the whole reaction bin, the tail end of the gas inlet pipe finally extends out of the reaction bin from the upper portion of the right end of the reaction bin, a plurality of air pipes are connected to the gas inlet pipe in the reaction bin, a plurality of air holes are arranged on the air pipes, a liquid outlet pipe is connected to the right end of the reaction bin, and the liquid outlet pipe extends into a synthesis liquid storage tank. The reaction liquid directly enters the reaction bin through the liquid inlet pipe, the reaction gas flows into the reaction bin from various angles through the air holes of the air pipes and reacts with the reaction liquid, the reaction raw materials form a plug flow reaction in the reaction bin, the generated solution flows from the left end to the right end of the reaction bin, the reaction continuously proceeds, the reaction efficiency is improved, and the continuous reaction is promoted.

Description

Technical Field

[0001] This utility model relates to the field of lithium hexafluorophosphate production technology, specifically to a continuous synthesis equipment for lithium hexafluorophosphate. 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 current synthesis of lithium hexafluorophosphate mainly involves mixing lithium fluoride with a solvent, followed by the addition of phosphorus pentafluoride for reaction. However, the lithium fluoride needs to be mixed to a suspension state to ensure sufficient reaction during the phosphorus pentafluoride reaction. To facilitate control of the mixing state during and after mixing and improve subsequent reaction efficiency, Chinese utility model patent with publication number "CN221789284U" discloses a continuous synthesis device for lithium hexafluorophosphate, including a reactor; a primary mixing mechanism located at the top of the reactor, comprising a primary mixing tank with an observation window on its surface, a stirring mechanism extending into the tank from its upper end, feeding pipes on both sides of the tank, and a turbulence-inducing cylinder connected to the upper part of the tank, with turbulence holes on its surface and bottom. The mixing process utilizes a stirring mechanism and turbulence holes on the surface of a baffle cylinder to agitate the solution back and forth between the initial mixing tank and the baffle cylinder, improving stirring efficiency and facilitating rapid mixing of reactants into a suspension state. Real-time observation through a viewing window allows monitoring of the mixing status. Furthermore, a valve-pump integrated unit pressurizes the solution upon discharge via a spray pipe, further enhancing the pre-reaction mixing state. However, this device involves initial mixing of reactants in the initial mixing tank, with the baffle cylinder's surface turbulence causing the solution to flow back and forth between the tank and the baffle cylinder before finally spraying it into the reaction vessel. While this back-and-forth movement between the baffle cylinder and the initial mixing tank improves stirring efficiency, it also results in a discontinuous flow of the mixed reactants into the reaction vessel, reducing reaction efficiency and causing an intermittent reaction process. Utility Model Content

[0004] The purpose of this invention is to provide a continuous synthesis device for lithium hexafluorophosphate, so as to solve the problems of reduced reaction efficiency and discontinuous reaction progress in existing synthesis devices.

[0005] To solve the above-mentioned technical problems, the following technical solution is provided:

[0006] A continuous synthesis apparatus for lithium hexafluorophosphate includes a reaction chamber arranged laterally. An inlet pipe and a liquid inlet pipe are provided at the upper left end of the reaction chamber. The inlet pipe extends into the reaction chamber and bends laterally through the entire reaction chamber. The tail end of the inlet pipe bends upward and extends out of the reaction chamber from the upper right end. Several vent pipes are connected to the inlet pipe inside the reaction chamber. Several evenly arranged vent holes are provided on the vent pipes. A liquid outlet pipe is connected to the right end of the reaction chamber and extends into a synthesis liquid storage tank. The gas pressure flowing out of the inlet pipe is greater than the liquid pressure flowing out of the liquid inlet pipe.

[0007] The basic principle of the above technical solution is as follows: LiF and anhydrous HF solution enter the reaction chamber through the inlet pipe. PF5 and HCl gas first pass through the gas inlet pipe, and then flow into the reaction chamber from various angles through the vent holes of several vent pipes to react with LiF and anhydrous HF solution. The gas pressure flowing out of the gas inlet pipe is greater than the liquid pressure flowing out of the liquid inlet pipe, so that the liquid cannot flow back into the gas inlet pipe. The continuous introduction of reaction liquid and reaction gas forms a piston flow reaction in the reaction chamber, so that the generated solution flows from the left end to the right end of the reaction chamber, and finally flows into the synthesis liquid storage tank through the outlet pipe for storage. The generated tail gas flows out of the reaction chamber through the tail end of the gas inlet pipe.

[0008] The beneficial effects of the above technical solution are as follows: Compared with the existing method where the reaction raw materials are mixed uniformly by flowing back and forth between the turbulence chamber and the initial mixing chamber, the reaction liquid in this technical solution enters the reaction chamber directly through the inlet pipe. The reaction gas flows into the reaction chamber from various angles through the vent holes of several vent pipes to react with the reaction liquid. The vent holes of several vent pipes can uniformly mix the reaction gas and the reaction liquid and carry out the reaction. Furthermore, the reaction raw materials form a piston flow reaction in the reaction chamber, and the generated solution flows from the left end to the right end of the reaction chamber, so that the reaction can proceed continuously, improve the reaction efficiency, and promote the continuous progress of the reaction.

[0009] Furthermore, the end of the inlet pipe extending into the reaction chamber is equipped with an anti-impact plate, which is tapered from top to bottom. The tapering structure causes the cross-section of the anti-impact plate to gradually decrease from top to bottom, forming an effect similar to a "guide cone". When the fluid flows along the plate surface, it is guided by the tapering shape and gradually diffuses in all directions, avoiding the formation of a high-speed jet zone below the inlet pipe.

[0010] Furthermore, the plurality of vent pipes are evenly arranged above and below the inlet pipe, with an interval of 100-600mm between adjacent vent pipes. The diameter of the vent pipes is Φ25-150mm, the diameter of the vent holes is Φ2-20mm, and the length of the vent pipes is 300mm. The vent holes of the vent pipes evenly arranged above and below the inlet pipe allow the reaction gas to flow into the reaction chamber from various angles.

[0011] Furthermore, the reaction chamber is divided into three sections: the leftmost section, the middle section, and the rightmost section. The length of the middle section is between 3000-20000 mm, and its diameter is between Φ50-500 mm. Both the gas inlet pipe and the liquid inlet pipe extend into the reaction chamber from the leftmost section, while the tail end of the gas inlet pipe extends out of the reaction chamber from the rightmost section. The liquid and gas generated by the reaction flow from left to right, forming a piston flow pattern to prevent backflow.

[0012] Furthermore, the outlet pipe includes an upper outlet pipe and a lower outlet pipe. The upper outlet pipe is connected to the top of the rightmost section of the reaction chamber and extends downwards into the synthesis liquid storage tank. The lower outlet pipe is connected to the bottom of the rightmost section of the reaction chamber. When the height of the liquid generated by the reaction does not exceed the top of the reaction chamber, it flows from the lower outlet pipe into the synthesis liquid storage tank for storage. When the height exceeds the top of the reaction chamber, the liquid generated by the reaction flows simultaneously from both the upper and lower outlet pipes into the synthesis liquid storage tank, accelerating the amount of liquid generated flowing out of the reaction chamber and preventing the liquid generated from stagnating in the reaction chamber, which would affect the continuity of the reaction.

[0013] Furthermore, the leftmost, middle, and rightmost sections of the reaction chamber are connected by flange seals, and the ends of the leftmost and rightmost sections that are furthest from each other are sealed by flange plates. The flange connection facilitates disassembly for cleaning of the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the synthesis equipment of this utility model;

[0015] Figure 2 This is a schematic diagram of the venting tube.

[0016] The reference numerals in the accompanying drawings include: reaction chamber 1, air inlet pipe 2, liquid inlet pipe 3, anti-impact plate 4, vent pipe 5, vent hole 6, upper liquid pipe 7, lower liquid pipe 8, and synthesis liquid storage tank 9. Detailed Implementation

[0017] The following detailed description illustrates the specific implementation method:

[0018] The basic implementation examples are as follows: Figure 1-2 As shown:

[0019] A continuous synthesis apparatus for lithium hexafluorophosphate, such as Figure 1As shown, the reaction chamber 1 is arranged horizontally and is divided into three sections: the leftmost section, the middle section and the rightmost section. The leftmost section, the middle section and the rightmost section of the reaction chamber 1 are connected by a flange seal, and the ends of the leftmost section and the rightmost section that are far apart from each other are sealed by a flange. The middle section is 6000mm long and Φ820mm in diameter. An air inlet pipe 2 and a liquid inlet pipe 3 are located at the upper left of the reaction chamber 1. An anti-impact plate 4 is located at the end of the liquid inlet pipe 3 extending into the reaction chamber 1. The anti-impact plate 4 tapers from top to bottom. The air inlet pipe 2 extends into the reaction chamber 1 and bends laterally through the middle section of the entire reaction chamber 1. The tail end of the air inlet pipe 2 bends upward and extends out of the reaction chamber 1 from the upper right of the reaction chamber 1. Several vent pipes 5 are connected to the air inlet pipe 2 in the middle section of the reaction chamber 1. The vent pipes 5 are evenly arranged above and below the air inlet pipe 2, with a spacing of 330mm between adjacent vent pipes 5. The diameter of each vent pipe 5 is Φ57mm, and the length is 300mm. Figure 2 As shown, the vent pipe 5 is provided with several evenly arranged vent holes 6, the diameter of which is Φ5mm. The right end of the reaction chamber 1 is connected to a liquid outlet pipe, which includes an upper liquid outlet pipe 7 and a lower liquid outlet pipe 8. The upper liquid outlet pipe 7 is connected to the top of the rightmost section of the reaction chamber 1 and bends downward to extend into the synthesis liquid storage tank 9. The lower liquid outlet pipe 8 is connected to the bottom of the rightmost section of the reaction chamber 1 and extends into the synthesis liquid storage tank 9. The gas pressure flowing out of the air inlet pipe 2 is greater than the liquid pressure flowing out of the liquid inlet pipe 3.

[0020] The specific implementation process is as follows:

[0021] LiF and anhydrous HF solution enter the reaction chamber 1 through the inlet pipe 3. PF5 and HCl gas first pass through the inlet pipe 2, and then through the vents 6 of several vent pipes 5, flowing into the reaction chamber 1 from various angles to react with LiF and anhydrous HF solution. The gas pressure flowing out of the inlet pipe 2 is greater than the liquid pressure flowing out of the inlet pipe 3, preventing the liquid from flowing back into the inlet pipe 2. This does not affect the gas delivery into the reaction chamber 1 through the vents 6. The continuous flow of reaction liquid and reaction gas forms a piston flow reaction in the reaction chamber 1, causing the generated solution to flow from the left end to the right end of the reaction chamber 1. Finally, it flows through the outlet pipe into the synthesis liquid storage tank 9 for storage. The generated tail gas flows out of the reaction chamber 1 through the tail end of the inlet pipe 2. The reaction liquid enters the reaction chamber 1 directly through the inlet pipe 3. The reaction gas flows into the reaction chamber 1 from various angles through the vent holes 6 of several vent pipes 5 to react with the reaction liquid. The vent holes 6 of several vent pipes 5 can evenly mix the reaction gas with the reaction liquid and carry out the reaction. The reaction raw materials form a piston flow reaction in the reaction chamber 1. The generated solution flows from the left end to the right end of the reaction chamber 1, so that the reaction can proceed continuously, improve the reaction efficiency, and promote the continuous progress of the reaction.

[0022] 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 continuous synthesis apparatus for lithium hexafluorophosphate, comprising a reaction chamber, characterized in that: The reaction chamber is arranged horizontally. An air inlet pipe and a liquid inlet pipe are provided at the upper left end of the reaction chamber. The air inlet pipe extends into the reaction chamber and bends horizontally through the entire reaction chamber. The tail end of the air inlet pipe bends upward and extends out of the reaction chamber from the upper right end. Several vent pipes are connected to the air inlet pipe inside the reaction chamber. Several evenly arranged vent holes are provided on the vent pipes. A liquid outlet pipe is connected to the right end of the reaction chamber and extends into the synthesis liquid storage tank. The gas pressure flowing out of the air inlet pipe is greater than the liquid pressure flowing out of the liquid inlet pipe.

2. The continuous synthesis equipment for lithium hexafluorophosphate according to claim 1, characterized in that: The end of the liquid inlet pipe that extends into the reaction chamber is equipped with an anti-impact plate, which is designed to taper from top to bottom.

3. The continuous synthesis equipment for lithium hexafluorophosphate according to claim 2, characterized in that: The plurality of vent pipes are evenly arranged above and below the air inlet pipe, with an interval of 100-600mm between adjacent vent pipes, a diameter of Φ25-150mm for the vent pipes, a diameter of Φ2-20mm for the vent holes, and a length of 300mm for the vent pipes.

4. The continuous synthesis equipment for lithium hexafluorophosphate according to claim 3, characterized in that: The reaction chamber is divided into three sections: the leftmost section, the middle section, and the rightmost section. The length of the middle section is between 3000-20000 mm, and the diameter of the middle section is between Φ50-500 mm. The air inlet pipe and the liquid inlet pipe both extend into the reaction chamber from the leftmost section, and the tail end of the air inlet pipe extends out of the reaction chamber from the rightmost section.

5. The continuous synthesis equipment for lithium hexafluorophosphate according to claim 4, characterized in that: The liquid outlet pipe includes an upper liquid pipe and a lower liquid pipe. The upper liquid pipe is connected to the top of the rightmost section of the reaction chamber and bends downward to extend into the synthesis liquid storage tank. The lower liquid pipe is connected to the bottom of the rightmost section of the reaction chamber.

6. The continuous synthesis equipment for lithium hexafluorophosphate according to claim 5, characterized in that: The leftmost, middle, and rightmost sections of the reaction chamber are connected by a flange seal, and the ends of the leftmost and rightmost sections that are far apart from each other are sealed by a flange.

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