Disacidifying and dewatering method of fluoroethylene carbonate

A technology of fluoroethylene carbonate and acid scavenger, applied in the direction of organic chemistry, etc., can solve the problems of not meeting the requirements of high-quality battery grade, high free acid content and moisture content, meet the requirements, reduce free acid and moisture content The effect of simple content and method

Active Publication Date: 2010-06-02
ZHANGJIAGANG HUASHENG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the traditional production process, the free acid content and water content in fluoroethylene carbonate are too high, which cannot meet the requirements of high-quality battery grade

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Fluoroethylene carbonate, the purity is 99.5%, the water content is 100ppm, and the free acid is 120ppm. Get above-mentioned fluorinated ethylene carbonate 100g, add 3% magnesia, remove acid treatment at 20 ℃ for 2 hours, the free acid after treatment is 21ppm (using potentiometric titrator to measure). Add 2% activated carbon, and remove water at 20° C. for 5 hours, and the moisture after treatment is 23 ppm (measured by a Karl Fischer moisture meter).

Embodiment 2

[0014] Fluoroethylene carbonate, the purity is 99.8%, the water content is 80ppm, and the free acid is 95ppm. Take 100 g of the above-mentioned fluoroethylene carbonate, add 0.1% calcium oxide and silicon oxide mixture, and remove acid at 35° C. for 5 hours. After the treatment, the free acid is 28 ppm (measured by a potentiometric titrator). Add 5% aluminosilicate oxide, dewater at 35° C. for 30 hours, and the water content after treatment is 17 ppm (measured by Karl Fischer moisture meter).

Embodiment 3

[0016] Fluoroethylene carbonate, the purity is 99.9%, the water content is 69ppm, and the free acid is 53ppm. Take 100 g of the above-mentioned fluoroethylene carbonate, add 10% aluminum oxide, and remove acid at 25° C. for 0.5 hour. After the treatment, the free acid is 23 ppm (measured by a potentiometric titrator). 20% barium sulfate was added, and the water was removed at 25° C. for 10 hours, and the water content after treatment was 9 ppm (measured by a Karl Fischer moisture meter).

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PUM

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Abstract

The invention discloses a disacidifying and dewatering method of fluoroethylene carbonate, which has simple method and can effectively lower the content of free acid and water in the fluoroethylene carbonate. The method is characterized by comprising the following steps of: adding an acid scavenger which is not dissolved into the fluoroethylene carbonate but can react with the free acid in the fluoroethylene carbonate to generate a precipitate or a volatile substance and adding a dehydrator which is not dissolved into the fluoroethylene carbonate and can adsorb the water after finishing disacidifying, wherein the acid scavenger is at least one of oxides of calcium, magnesium, aluminum and silicon, and the adding quantity of the acid scavenger is 0.01-10% of the weight of the fluoroethylene carbonate. The dehydrator is aluminosilicate oxide, active carbon, silica gel, barium sulfate or activated alumina, and the adding quantity of the dehydrator is 2-20% of the weight of the fluoroethylene carbonate. The invention is suitable for lowering the content of the free acid and the water in the fluoroethylene carbonate.

Description

technical field [0001] The invention relates to a method for removing acid and water of fluoroethylene carbonate. Background technique [0002] Fluoroethylene carbonate is mainly used in the lithium ion electrolyte of high-power lithium batteries, which can effectively improve the low temperature resistance of lithium batteries and improve the flame retardancy of lithium batteries. The free acid in the electrolyte is too high. For example, hydrofluoric acid will form lithium fluoride with lithium ions. During the charging and discharging process, the negative electrode interface will form a barrier, which will increase the internal resistance of the battery and affect the insertion and deintercalation of lithium ions in the negative electrode of the battery. Affect the performance of the battery, usually the free acid content in the electrolyte is controlled within 100ppm or lower, and the water content is within 30ppm or lower. Therefore, the requirements for free acid and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/42
Inventor 沈锦良张先林杨志勇李伟锋张丽亚
Owner ZHANGJIAGANG HUASHENG CHEM CO LTD
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