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Synthetic process of lithium hexafluorophosphate

A technology of lithium hexafluorophosphate and synthesis process, which is applied to phosphorus compounds, non-metallic elements, chemical instruments and methods, etc., can solve the problems of slow reaction speed and low mixing efficiency, and achieves fast reaction speed, high gas-liquid mixing efficiency and high purity. Effect

Inactive Publication Date: 2009-05-06
张家港市亚源高新技术材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional gas-liquid synthesis method utilizes the mixed reaction of the gas-liquid interface in the reactor, which has low mixing efficiency and slow reaction speed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In this embodiment, the micro-bubble generating device is arranged inside the kettle-type reaction device, and 50 liters of anhydrous hydrogen fluoride solution of lithium fluoride with a weight concentration of 15% are added to the kettle-type reaction device in advance, and the ultra-micro-bubble generating device is started. Into the ultra-fine bubble generating device, the phosphorus pentafluoride gas is introduced to generate bubbles with a diameter of about 10 μm. The bubbles enter the anhydrous hydrogen fluoride solution of lithium fluoride and react to generate crude lithium hexafluorophosphate. During this process, the reactor reactor is controlled. The volume ratio of liquid to gas in the medium is 9:1, the crude product is cooled to -15°C, and then separated by a solid-liquid separation device, the mother liquor can be transferred to a tank-type reaction device, and the next batch of reactions is continued, and the solid is transferred to a drying device Dryin...

Embodiment 2

[0020] In this embodiment, the micro-bubble generating device is arranged outside the tubular reaction device, and 80 liters of anhydrous hydrogen fluoride solution of lithium fluoride with a weight concentration of 20% are pre-added in the tubular reaction device, the ultra-micro-bubble generating device is started, and Into the micro-bubble generating device, the phosphorus pentafluoride gas is introduced to generate bubbles with a diameter of about 10 μm, and the bubbles enter the anhydrous hydrogen fluoride solution of lithium fluoride in the tubular reaction device, and react to produce crude lithium hexafluorophosphate. Here In the project, the volume ratio of liquid and gas in the tubular reaction device is controlled to be 8:3, the crude product is cooled to -28°C, and then separated by the solid-liquid separation device, and the mother liquor can be transferred to the tubular reaction device 2 for the next step. Batch reaction, the solid product was transferred to a dr...

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Abstract

The invention discloses a synthesis process of a lithium hexafluorophosphate non-aqueous solvent method. The gas-phase phosphorus pentafluoride is arranged in a super-micro bubble generation device to generate micro-bubbles with the diameter of 0.1-2000 microns; subsequently, the phosphorus pentafluoride reacts with lithium fluoride which is dissolved in anhydrous hydrogen fluoride in advance in a reaction unit to generate a lithium hexafluorophosphate crude product which is frozen and then separated by a solid liquid separation device; the solid gained by separation is transferred to a drying device and dried, thus gaining the lithium hexafluorophosphate solid. The process has the advantages that the interface mixing efficiency is high, the reaction speed is high, the jamming phenomenon of solid outcome is not generated, the continuous production is easy to achieve, and the generated solid has uniform granularity and high purity.

Description

technical field [0001] The invention relates to a synthesis process of lithium hexafluorophosphate, and more specifically relates to a process technology for synthesizing lithium hexafluorophosphate by using a non-aqueous solvent method. Background technique [0002] Since the advent of lithium-ion batteries in the 1980s, they have become the preferred high-performance secondary batteries because of their many superior properties, such as large specific energy, low self-discharge, long cycle life, fast charge and discharge, and no memory effect. [0003] Lithium salts known to be useful as electrolytes for secondary Li-ion batteries include LiAsF 6 、LiPF 6 、LiBF 4 , LiClO 4 、LiCF 3 SO 3 , Li(CF 3 SO 3 ) 2 N et al. Among them, lithium hexafluorophosphate has been widely used commercially due to its good comprehensive performance, and its output is increasing day by day. [0004] Lithium hexafluorophosphate has a variety of synthesis methods, including gas-solid react...

Claims

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Application Information

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IPC IPC(8): C01B25/455
Inventor 袁翔云
Owner 张家港市亚源高新技术材料有限公司
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