Continuous production system of lithium hexafluorophosphate

A technology of lithium hexafluorophosphate and production system, which is applied to lithium hexafluorophosphate, lithium compounds, electrochemical generators, etc., can solve the problems of difficult production technology, large reagents, large amount of by-products, etc., to reduce the possibility of contact and reaction, The effect of reducing the free acid of the product and prolonging the residence time

Active Publication Date: 2020-01-14
SINOCHEM LANTIAN +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Lithium hexafluorophosphate has received a lot of attention, but it has not been able to form a large-scale production. The main reason is that the production technology is difficult
Overcome many unsafe factors in production, consume a large amount of reagents, and the process can corrode equipment, which puts forward high requirements for equipment anti-corrosion and production environment, and equipment investment is relatively high
Lithium hexafluorophosphate products are sensitive to moisture. It is extremely important to ensure anhydrous operation. Not only during the reaction process, but also during the product transfer process, strict sealing is required. The above factors have greatly increased the production cost of lithium hexafluorophosphate.
However, the highest yield of lithium hexafluorophosphate product in this patent application is only 98.5%, and pure phosphorus pentafluoride gas is used, which has a high cost. At the same time, the specific purity of lithium hexafluorophosphate product and how to improve the quality of lithium hexafluorophosphate product are not disclosed.
[0033] It can be seen that the traditional hydrofluoric acid solvent method to prepare lithium hexafluorophosphate is mostly an intermittent process, with low production efficiency, low purity, large amount of by-products and difficult to handle. The current improved process or device is only adjusted for a single-step reaction , the effect is limited, and it is urgent to provide a production system for lithium hexafluorophosphate to improve the purity of lithium hexafluorophosphate, improve the ease of operation, and reduce production costs

Method used

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  • Continuous production system of lithium hexafluorophosphate
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  • Continuous production system of lithium hexafluorophosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] In a dissolution tank with a cooling jacket and stirring, use a pump to transport HF, and add LiF through a solid feeding device while cooling. The speed of adding LiF should be controlled so that the temperature of HF is 0°C and the concentration of LiF is 5wt. %, at the same time, the PCl 5 It is sent to the phosphorus pentafluoride generator (2) that stores HF to generate PF 5gas. Under pressure, the HF solution dissolved in LiF and PF were pumped 5 The gas is delivered to microchannel reactor A (3). Reactant PF in microchannel reactor A (3) 5 The molar ratio to LiF is 2:1, the residence time of reactants is 30 seconds, and the reaction temperature is 15°C. The reactant enters the microchannel reactor A (3) in a continuous state, and the output material is output in a continuous state, and enters the gas-liquid separator A (4) for gas-liquid separation, and the separated liquid phase product is a composition containing lithium hexafluorophosphate. points, trans...

Embodiment 2

[0080] In a dissolution tank with a cooling jacket and stirring, use a pump to transport HF, and add LiF through a solid feeding device while cooling. The speed of adding LiF should be controlled so that the temperature of HF is 0°C and the concentration of LiF is 4wt. %, at the same time, the PCl 5 It is sent to the phosphorus pentafluoride generator (2) that stores HF to produce PF 5 gas. Under pressure, the HF solution dissolved in LiF and PF were pumped 5 The gas is delivered to microchannel reactor A (3). Reactant PF in microchannel reactor A (3) 5 The molar ratio to LiF is 2:1, the residence time of reactants is 30 seconds, and the reaction temperature is 15°C. The reactant enters the microchannel reactor A (3) in a continuous state, and the output material is output in a continuous state, and enters the gas-liquid separator A (4) for gas-liquid separation, and the separated liquid phase product is a composition containing lithium hexafluorophosphate. points, trans...

Embodiment 3

[0083] In a dissolution tank with a cooling jacket and stirring, use a pump to transport HF, and add LiF through a solid feeding device while cooling. The speed of adding LiF should be controlled so that the temperature of HF is 0°C and the concentration of LiF is 4wt. %, at the same time, the PCl 5 It is sent to the phosphorus pentafluoride generator (2) that stores HF to produce PF 5 gas. Under pressure, the HF solution dissolved in LiF and PF were pumped 5 The gas is delivered to microchannel reactor A (3). Reactant PF in microchannel reactor A (3) 5 The molar ratio to LiF is 2:1, the residence time of reactants is 30 seconds, and the reaction temperature is 15°C. The reactant enters the microchannel reactor A (3) in a continuous state, and the output material is output in a continuous state, and enters the gas-liquid separator A (4) for gas-liquid separation, and the separated liquid phase product is a composition containing lithium hexafluorophosphate. points, trans...

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Abstract

The invention relates to a continuous production system of lithium hexafluorophosphate. The continuous production system comprises a phosphorus pentafluoride generator (2), a micro-channel reactor A (3), a gas-liquid separator A (4), a micro-channel reactor B (6) and a gas-liquid separator B (7), the gas generated by the phosphorus pentafluoride generator (2) is introduced into the micro-channel reactor A (3), the material output by the micro-channel reactor A (3) enters the gas-liquid separator A (4), the gas separated by the gas-liquid separator A (4) enters the micro-channel reactor B (6),and is used as a reaction raw material so as to continuously react, the material output by the micro-channel reactor B (6) enters the gas-liquid separator B (7), and a liquid component is separated out by the gas-liquid separator B (7) and is conveyed into the micro-channel reactor A (3). According to the invention, the raw materials and the by-products are recycled, so that the conversion rate and the utilization rate of the raw materials are improved, and the cost is reduced.

Description

technical field [0001] The invention relates to a continuous production system of lithium hexafluorophosphate, in particular to a continuous production system of lithium hexafluorophosphate based on a microchannel reactor and a lithium hexafluorophosphate product prepared by applying the continuous production system. Background technique [0002] Lithium hexafluorophosphate is currently the most widely used electrolyte salt in commercial lithium-ion batteries. With the rapid development of the electronics industry and the continuous expansion of the new energy field in the future, the demand for high-performance batteries is increasing, and the market demand for lithium hexafluorophosphate will show a trend of rapid increase. Lithium hexafluorophosphate, English name: Lithium hexafluorophosphate, structural formula: LiPF 6 , is white crystal or powder, relative density 1.5, easy to absorb moisture and decompose when exposed to water or humid air, especially in the air due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00H01M10/0563
CPCC01D15/005C01P2006/80C01P2006/82H01M10/0563Y02E60/10
Inventor 任建纲张海兵马小红刘海岛杨青章琪陈慧闯
Owner SINOCHEM LANTIAN
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