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Method for treating solid wastes of fluoroethylene carbonate ester

A fluoroethylene carbonate and waste residue technology, which is applied in the purification of alkali metal chlorides and alkali metal halides, etc., can solve the problems of slow heating speed, uneven heating, and difficulty in cleaning, and achieves fast heating speed, uniform heating, The effect of reducing processing steps

Active Publication Date: 2020-02-11
江苏瀚康新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of organic matter and other substances in solid waste, this process often leads to uneven heating, slow heating speed, extremely easy to produce agglomerates attached to the equipment wall, difficult to clean, and requires multiple crystallization and decolorization, the process is too cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take a crucible with a net weight of 107.8g, add 70g of fluoroethylene carbonate waste residue, put it into a 300°C far-infrared device for thermal decomposition for 2 hours, the fluoroethylene carbonate waste residue turns from brown to black, take out the black residue and weigh 58.9g , add 104g of 80°C hot water (containing 5.9g of potassium hydroxide), stir for 0.5h, concentrate the mother liquor after suction filtration, crystallize at room temperature, and obtain 45.2g of wet crystals, put them into far-infrared equipment for drying, and obtain dry 36.1 g of crystals, slightly yellowish in color. Add the crystals to 15g of hot water at 75°C, stir and dissolve for 0.5h, cool to room temperature to crystallize, and then wash with cold water to obtain 30.5g of wet crystals, put them into a small far-infrared equipment and dry them to obtain 24.4g of dry crystals, which is a qualified by-product Potassium chloride (99.94% pure).

Embodiment 2

[0021] Take a crucible with a net weight of 210.6g, add 100g of fluoroethylene carbonate waste residue, put it into a 310°C far-infrared device for thermal decomposition for 1.5h, the fluoroethylene carbonate waste residue turns from brown to black, take out the black residue and weigh 85.5 g, add 145g of 80°C hot water (containing 9.5g of potassium hydroxide), stir for 1 hour, concentrate the mother liquor after suction filtration, crystallize at room temperature, and obtain 66.2g of wet crystals, put them into far-infrared equipment for drying, and obtain dry 53.0 g of crystals, slightly yellowish in color. Add 25g of hot water at 80°C to the crystals, stir and dissolve for 1 hour, cool to room temperature to crystallize and wash with cold water to obtain 45.7g of wet crystals, put them into a small far-infrared equipment and dry them to obtain 36.3g of dry crystals, which is the qualified by-product chlorine Potassium chloride (99.95% pure).

Embodiment 3

[0023] Take a crucible with a net weight of 215.3g, add 140g of fluoroethylene carbonate waste residue, put it into a 320°C far-infrared device for thermal decomposition for 1 hour, the fluoroethylene carbonate waste residue turns from brown to black, take out the black residue and weigh 122.7g , add 192g of hot water at 80°C (containing 12.3g of potassium hydroxide), stir for 1 hour, concentrate the mother liquor after suction filtration, and crystallize at room temperature to obtain 106.2g of wet crystals, which are dried in far-infrared equipment to obtain dry crystals 85.8g, slightly yellowish in color. Add 40g of hot water at 70°C to the crystals, stir and dissolve for 1 hour, cool to room temperature to crystallize and wash with cold water to obtain 78.6g of wet crystals, put them into a small far-infrared equipment and dry them to obtain 62.9g of dry crystals, which is the qualified by-product chlorine Potassium chloride (99.96% pure).

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PUM

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Abstract

The invention discloses a method for treating solid wastes of fluoroethylene carbonate ester. The method comprises the following steps: 1) heating and decomposing fluoroethylene carbonate ester drogsin infrared equipment at a certain temperature; 2) adding a proper amount of hot water with a certain amount of potassium hydroxide into the decomposed drogs, performing stirring dissolution, performing concentration, and performing primary crystallization in a normal-temperature environment; 3) draining off water of a primary crystal, adding the primary crystal into clean water, performing heating to a certain temperature, performing stirring dissolution, performing concentration, and performing secondary crystallization in a normal-temperature environment; and 4) drying a secondary crystal in the infrared equipment at a certain temperature, so as to obtain a byproduct potassium chloride. By adopting the method for treating solid wastes of fluoroethylene carbonate ester, the infrared equipment is adopted for preheating, uniform heating can be implemented, the heating speed is rapid, organic matter in the solid drogs can be removed, caking is not easily caused, in addition, crystallization times can be reduced, treatment steps can be reduced, and the treatment cost can be correspondingly reduced.

Description

technical field [0001] The invention relates to the field of electrolyte additives for lithium-ion batteries, in particular to the purification and production efficiency of potassium chloride, a by-product of lithium-ion battery additives. Background technique [0002] Fluoroethylene carbonate (FEC) is an important electrolyte additive for lithium-ion batteries, which can improve the low-temperature performance of the electrolyte. Potassium chloride can be used in the inorganic industry, and is the basic raw material for the manufacture of various potassium salts such as potassium hydroxide, potassium sulfate, potassium nitrate, potassium chlorate, and potassium alum; in the pharmaceutical industry, it is used as a diuretic and for preventing and treating potassium deficiency drug. The dye industry is used to produce G salt, reactive dyes, etc.; in agriculture, it is a very effective potassium fertilizer with fast fertilizer efficiency. It can be directly applied to farmlan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C01D3/04
CPCC01D3/14C01D3/04C01P2006/80
Inventor 傅圣超姚双开陈宇孙西船朱会文孔令文
Owner 江苏瀚康新材料有限公司
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