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Method for preparing battery grade anhydrous lithium acetate

A lithium acetate, battery-level technology, which is applied in the field of preparation of inorganic compound lithium acetate, can solve the problem of high moisture content, and achieve the effects of low impurity content, easy-to-obtain raw materials, and simple process

Active Publication Date: 2015-04-08
HUBEI BAIJIERUI ADVANCED MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main method for preparing lithium acetate is the neutralization method: using lithium hydroxide or lithium carbonate to react to obtain a lithium acetate solution, and then obtaining lithium acetate dihydrate crystals through concentrated crystallization, but the current anhydrous lithium acetate process has a high moisture content.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A preparation method of battery grade anhydrous lithium acetate, the steps are as follows:

[0015] 1. Add 250kg of industrial grade lithium hydroxide monohydrate into 500L of pure water, stir and dissolve until the solution is clear, then slowly add 360kg of glacial acetic acid under stirring conditions, adjust the pH value to 7.0 with glacial acetic acid after the addition, and the reaction is complete, After stabilizing for 10min, the pH value of the re-measured solution is between 7-7.5, and the obtained feed liquid is filtered to remove insoluble impurities to obtain a pure lithium acetate solution;

[0016] 2. Evaporate and concentrate the purified lithium acetate solution obtained in step 1 to about 1 / 2 of the original volume and the temperature is 110 ° C. It can be observed that a small amount of crystals are precipitated. After a little cooling, the material is poured into the stirring and drying equipment for Stir and dry, and the drying temperature is 110 ° ...

Embodiment 2

[0020] A preparation method of battery grade anhydrous lithium acetate, the steps are as follows:

[0021] 1. Add 200kg of industrial grade lithium hydroxide monohydrate into 400L of pure water, stir and dissolve until the solution is clear, then slowly add 290kg of glacial acetic acid under stirring conditions, adjust the pH value to 7.5 with glacial acetic acid after adding, and stabilize under stirring conditions 13min, the re-measured pH value is between 7-7.5, and the obtained feed liquid is filtered to remove insoluble impurities to obtain a pure lithium acetate solution;

[0022] 2. Evaporate and concentrate the purified lithium acetate solution obtained in step 1 to about 1 / 3 of the original volume, and control the temperature at the end of the evaporation to be 130 ° C. At this time, a large number of crystals have been precipitated, cool down a little, and put the material into the stirring and drying equipment Internal drying material, the drying temperature is 130 ...

Embodiment 3

[0026] A preparation method of battery grade anhydrous lithium acetate, the steps are as follows:

[0027] 1. Add 300kg of industrial grade lithium hydroxide monohydrate into 600L of pure water, stir and dissolve until the solution is clear, then add 430kg of glacial acetic acid under stirring, and measure the pH value after adding to 6.5-7.0, then add an appropriate amount of monohydrate hydroxide The pH of lithium is adjusted back to 7.5, and after stabilizing for 15 minutes, the pH value is re-measured between 7-7.5, and the obtained feed liquid is filtered to remove insoluble impurities to obtain a pure lithium acetate solution;

[0028] 2. Evaporate and concentrate the purified lithium acetate solution obtained in step 1 to about 1 / 3 of the original volume, and control the temperature of the evaporation end point to 120 ° C. If a small amount of crystals are found, directly inject the material into the stirring and drying equipment for further concentration. Evaporate, th...

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Abstract

The invention belongs to the technical field of the preparation of inorganic lithium acetate compounds and particularly discloses a method for preparing battery grade anhydrous lithium acetate. In the method, industrial lithium hydroxide monohydrate and glacial acetic acid are used as raw materials and are subjected to neutralization reaction so as to prepare lithium acetate net liquid; then, the net liquid is concentrated and dried twice to obtain the high-quality battery grade anhydrous lithium acetate. The method has the advantages of cheap and easily acquired raw materials, simple process, strong operability and high utilization rate of elements in the whole process. The yield rate of the product is higher than 95%, and no gases or waste resides which are harmful to environments are produced. Meanwhile, the water content of the obtained anhydrous lithium acetate is smaller than 500 ppm, and the impurity content is low.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic compound lithium acetate, in particular to a preparation method of battery grade anhydrous lithium acetate. Background technique [0002] Lithium acetate, an inorganic salt, colorless crystal, as a raw material for lithium batteries, is mainly used in the lithium battery industry mixed with other electrolytes such as polymers to improve the conductivity of lithium battery electrolytes. In addition, lithium acetate It is also often used as a catalyst in organic synthesis, and is widely used in the pharmaceutical industry, especially in biopharmaceuticals; the chemical indicators of lithium acetate are all required in the above uses; the 21st century, as the first year of the mobile Internet, with the With the rapid development of mobile terminals such as smartphones, the demand for high-quality lithium batteries continues to increase, which directly leads to an increase in the dema...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/10C07C51/41
CPCC07C51/412C07C53/10
Inventor 赵正红陈力纪东海
Owner HUBEI BAIJIERUI ADVANCED MATERIALS
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