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Method for producing high-purity lithium hexafluorophosphate

A lithium hexafluorophosphate, high-purity technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as improving detection indicators

Inactive Publication Date: 2012-06-27
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the detection index of the product still needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 442 grams of commercially available lithium fluoride solid to a 20-liter dissolution kettle made of SUS316 stainless steel, and dissolve it in 11,000 grams of hydrogen fluoride to form a solution for later use.

[0015] Add 4172 grams of commercially available phosphorus pentachloride solids to a 20-liter reactor made of SUS316 stainless steel, and slowly add 2400 grams of commercially available anhydrous hydrogen fluoride into the reactor to generate a mixed gas of phosphorus pentafluoride and hydrogen chloride. Pass the mixed gas into a washing device containing 800 grams of polytetrafluoroethylene ring and 2000 grams of liquid hydrogen fluoride, and wash and remove impurities at minus 50 degrees. Pass the above-mentioned treated mixed gas of phosphorus pentafluoride and spare lithium fluoride solution into the spray absorption reactor to react to generate lithium hexafluorophosphate solution. After the reaction was complete, 776 grams of lithium hexafluorophospha...

Embodiment 2

[0017] Add 442 grams of commercially available lithium fluoride solid to a 20-liter dissolution kettle made of SUS316 stainless steel, and dissolve it in 11,000 grams of hydrogen fluoride to form a solution for later use.

[0018] Add 4172 grams of commercially available phosphorus pentachloride solids to a 20-liter reactor made of SUS316 stainless steel, and slowly add 2400 grams of commercially available anhydrous hydrogen fluoride into the reactor to generate a mixed gas of phosphorus pentafluoride and hydrogen chloride. Pass the mixed gas into a washing device containing 1000 grams of high-purity graphite packing and 2500 grams of liquid hydrogen fluoride, and wash and remove impurities at minus 65 degrees. Pass the above-mentioned treated mixed gas of phosphorus pentafluoride and spare lithium fluoride solution into the graphite falling film absorber to react to generate lithium hexafluorophosphate solution. After the reaction was complete, 728 grams of lithium hexafluoro...

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Abstract

The invention discloses a method for producing high-purity lithium hexafluorophosphate, comprising the following steps: 1) reacting hydrogen fluoride with phosphorus pentachloride to prepare a mixed gas of phosphorus pentafluoride and hydrogen chloride, removing impurities by letting the mixed gas pass through a washing device; 2) dissolving lithium fluoride in hydrogen fluoride to form a hydrogen fluoride solution of lithium fluoride; and 3) reacting lithium fluoride solution with phosphorus pentafluoride in an absorption reactor to form a lithium hexafluorophosphate solution, carrying out crystallization, separating and drying to obtain a high-purity lithium hexafluorophosphate solid.

Description

technical field [0001] The invention belongs to the technical field of lithium hexafluorophosphate production for lithium ion battery electrolytes, and in particular relates to a method for producing high-purity lithium hexafluorophosphate. Background technique [0002] Electrolyte is one of the important raw materials in lithium-ion secondary batteries, which can affect various performances of batteries. Among them, the electrolyte lithium hexafluorophosphate is one of the most critical materials for the manufacture of the electrolyte. With the large-scale application of lithium-ion secondary batteries, its usage has also increased sharply. At present, there are mainly two production methods for lithium hexafluorophosphate. The first method is to react phosphorus compounds and the like with fluorine gas to generate phosphorus pentafluoride, and then react with lithium fluoride to obtain lithium hexafluorophosphate. CN 01115040.8, CN200910311224.3, JP 201042937, JP 2001122...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/455
Inventor 刘红光刘大凡周立山叶学海赵庆云郭西凤
Owner CHINA NAT OFFSHORE OIL CORP
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