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Method for preventing decomposition of chloroethylene carbonate

A technology of chlorinated ethylene carbonate and potassium bicarbonate, applied in the direction of organic chemistry, etc., can solve problems such as decomposition or polymerization of chlorinated ethylene carbonate

Active Publication Date: 2016-11-09
TIANJIN VOCATIONAL INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chloroethylene carbonate is difficult to control because the chlorination process is difficult to control during the synthesis and preparation process, which often leads to the presence of various impurities in the synthetic product, especially the existence of dichlorinated products and some acidic substances. The existence of these impurities can easily lead to chlorination. Ethylene carbonate decomposes or polymerizes during storage and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Add 1838g of 81% chloroethylene carbonate raw material into a 2000ml three-neck flask with magnetic stirring, add 30g of sodium bicarbonate to it at room temperature, and after stirring for 2h, filter the mixture, and purify the filtrate under reduced pressure. Distillation, collecting a total of 1520g at 100~110°C / 1~3kPa of the overhead fraction, the content of chloroethylene carbonate is 93% after analysis, and the product yield is 95% based on the pure product of chloroethylene carbonate.

[0012] Sampling analysis

[0013] The chloroethylene carbonate product that tower top obtains is packed in the glass bottle with cover, it is placed in the natural light of indoor non-direct sunlight, keeps room temperature, takes a sample analysis purity at regular intervals, and observes color change, the result as follows:

[0014] sampling time

Embodiment 2

[0016] Add 1838g of 81% chloroethylene carbonate raw material into a 2000ml three-necked flask with magnetic stirring, raise the temperature to 50°C, add 100g of potassium bicarbonate to it, stir for 2h, filter the mixture, and depressurize the filtrate Rectification, collecting tower top distillate 90~100 ℃ / 0.4~1kPa totals 1473g, through analysis chloroethylene carbonate content is 95%, calculates with chloroethylene carbonate pure product, product yield is 94%.

[0017] Sampling analysis

[0018] The chloroethylene carbonate product that tower top obtains is packed in the glass bottle with cover, it is placed in the natural light of indoor non-direct sunlight, keeps room temperature, takes a sample analysis purity at regular intervals, and observes color change, the result as follows:

[0019] sampling time

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PUM

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Abstract

The invention discloses a method for preventing decomposition of chloroethylene carbonate. The method includes steps: allowing contact of chloroethylene carbonate with solid inorganic base at 0-80 DEG C, filtering the mixture, subjecting filtrate to vacuum rectification, and collecting overhead fraction to obtain the required chloroethylene carbonate.

Description

technical field [0001] The invention relates to a method for preventing the decomposition of chloroethylene carbonate. Background technique [0002] Chloroethylene carbonate is an important intermediate of lithium battery additives, from which a variety of important additives can be derived. For example, fluoroethylene carbonate can be synthesized from chloroethylene carbonate, or it can be prepared under the action of an organic base vinylene carbonate. However, chloroethylene carbonate is difficult to control because the chlorination process is difficult to control during the synthesis and preparation process, which often leads to the presence of various impurities in the synthetic product, especially the existence of dichlorinated products and some acidic substances. The existence of these impurities can easily lead to chlorination. Ethylene carbonate decomposes or polymerizes during storage and use. Contents of the invention [0003] In order to prevent the decomposi...

Claims

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Application Information

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IPC IPC(8): C07D317/42
CPCC07D317/42
Inventor 张洪源胡兴兰王丽秀张楠郑家琪
Owner TIANJIN VOCATIONAL INST
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