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Lithium hexafluorophosphate waste liquid recovery method

A technology for recycling lithium hexafluorophosphate and waste liquid, which can be used in lithium hexafluorophosphate, chemical instruments and methods, lithium compounds, etc., and can solve problems such as waste of organic solvents and waste of lithium hexafluorophosphate products.

Inactive Publication Date: 2021-03-09
MORITA NEW ENERGY MATERIALS ZHANGJIAGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this detection process, the more lithium hexafluorophosphate is detected, the more organic waste liquid is used for analysis. Generally, these organic solvents can only be incinerated by entrusting an external agency, which not only wastes the organic solvent, but also wastes the waste in the solvent. Lithium hexafluorophosphate products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Experimental raw materials: insoluble matter analysis waste liquid (DMC solution with a lithium hexafluorophosphate content of 85.5g / L), 99.9% potassium bistrifluoromethanesulfonimide

[0018] Specific steps are as follows:

[0019] (1), add 880g of potassium bistrifluoromethanesulfonimide to the above 5L analysis waste liquid, fully stir and react for 36 hours;

[0020] (2), centrifuge the reaction mother liquor, add 500ml of pure DMC during centrifugation, take out the solid, and the centrifugate is for use;

[0021] (3), the solid obtained by centrifugation was dried at 80° C. for 4 hours to obtain 458 g of potassium hexafluorophosphate, and the purity analysis result was 99.67%;

[0022] (4) Dry the centrifuge by rotary evaporation at 60°C, and dry it at 100°C for 8 hours after becoming solid to obtain crude bistrifluoromethanesulfonimide lithium, which is condensed and collected during the rotary evaporation to 4.8L solvent;

[0023] (5) The crude lithium bistri...

Embodiment 2

[0025] Experimental raw materials: insoluble matter analysis waste liquid (DMC solution with a lithium hexafluorophosphate content of 81g / L), 99.9% potassium bistrifluoromethanesulfonylimide

[0026] Specific steps are as follows:

[0027] (6) Add 500 g of potassium bistrifluoromethanesulfonimide to the above 3 L analysis waste liquid, and fully stir and react for 30 hours;

[0028] (7), centrifuge the reaction mother liquor, add 500ml of pure DMC during centrifugation, take out the solid, and the centrifugate is for use;

[0029] (8), the solid obtained by centrifugation was dried at 90° C. for 3 hours to obtain 263 g of potassium hexafluorophosphate, and the purity analysis result was 99.52%;

[0030] (9) Dry the centrifuge by rotary evaporation at 70°C, and dry it at 120°C for 6 hours after it becomes solid to obtain crude lithium bistrifluoromethanesulfonimide, which is condensed and collected during the rotary evaporation to 2.9L solvent;

[0031] (10) The crude lithiu...

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Abstract

The invention discloses a lithium hexafluorophosphate waste liquid recovery method which comprises the following steps: reacting potassium salt with lithium hexafluorophosphate in a solvent, precipitating the generated potassium hexafluorophosphate in a precipitation manner while still dissolving lithium salt in an organic solvent, carrying out solid-liquid separation and drying to obtain pure potassium hexafluorophosphate, carrying out rotary drying on the liquid to obtain lithium salt. and in the rotary drying process, collecting and recycling the organic solvent through condensation. By means of the lithium hexafluorophosphate waste liquid recycling method, potassium hexafluorophosphate with the purity of 99.5% or above and pure lithium salt with the purity of 99% or above can be obtained.

Description

technical field [0001] The present application relates to the field of waste liquid treatment of lithium hexafluorophosphate, in particular to a method for recovering waste liquid from lithium hexafluorophosphate analysis. Background technique [0002] Lithium hexafluorophosphate is used as the electrolyte of lithium-ion batteries and an important electrolyte salt of lithium-ion battery electrolytes. Its quality has a great impact on the overall performance of lithium-ion batteries. The content of insoluble impurities, mainly lithium fluoride, directly affects the quality of lithium batteries. This requires insoluble matter analysis and detection before using lithium hexafluorophosphate. The current mainstream detection and analysis method in the industry is to use organic solvents to dissolve lithium hexafluorophosphate, and then perform suction filtration to measure insoluble matter after fully dissolved. In this detection process, the more lithium hexafluorophosphate is d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00C01B21/086
CPCC01D15/005C01B21/086C01P2006/80
Inventor 堀尾博英
Owner MORITA NEW ENERGY MATERIALS ZHANGJIAGANG CO LTD
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