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Vinylene carbonate preparation method

A technology of vinylene carbonate and ethylene carbonate, which is applied in the field of preparation of vinylene carbonate, can solve the problems of unavailable, unstable results, difficult to repeat, etc., to facilitate removal, stable reaction results, and prevent polymerization Effect

Inactive Publication Date: 2007-12-05
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] When using the above method, in the chlorination process, the system contains oxygen and cannot obtain the corresponding product; in the process of preparing vinylene carbonate from monochloroethylene carbonate dehydrochlorination, the result is very unstable and difficult to repeat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Synthesis of monochloroethylene carbonate:

[0022] Take 400g of ethylene carbonate and put it into a cylindrical reactor (diameter 400mm, height 1000mm), add CCl 4 Solvent 800ml, use pure nitrogen to remove the air, under the irradiation of 20W ultraviolet light, in 65 ℃ water bath, pass chlorine gas for 6 hours, consume 400g of chlorine gas in total, and pass pure nitrogen gas at the same time to stir (flow rate 2 liters / min·400g sulfite Vinyl ester) After the reaction was completed, the solvent was reclaimed by atmospheric distillation to obtain 588g of crude product, gas chromatography analysis results: monochloride content 77.12%, dichloride 8.66, ethylene carbonate 8.84%, solvent 4.65%, the crude product was decompressed (20mmHg) distillation, get the front cut (70~90 ℃) 48g, gas chromatography analysis result: monochloride content 42.61%, dichloride 49.58%, ethylene carbonate 2.98%, solvent 4.43%; Get back cut ( 95°C) 499g.

[0023] Gas chromatography analy...

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PUM

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Abstract

The invention provides a process for preparing ethylene carbonate which comprises the steps of synthesis of ethylene carbonate chloride and synthesis of ethylene carbonate, wherein the synthesis of ethylene carbonate chloride comprises purging nitrogen to avoid air disturbance, charging activated carbon catalyst into the hydrogen chloride removing reaction of chlorides, and dripping ethylene carbonate chloride into triethylamine ether solution.

Description

technical field [0001] The present invention relates to the preparation method of vinylene carbonate. Background technique [0002] Vinylene carbonate is a monomer for preparing polyvinylene carbonate, and its polymer can be hydrolyzed to generate polyhydroxymethylene (Polymer Science, 58, 533 (1962), N.P.Field and J.R.Schaefgen, J.PolymerSci.58, 533 (1962)). Both polymers form a film. Utilizing its film-forming properties, vinylene carbonate can be used as an electrolyte additive for lithium-ion batteries. Vinylene carbonate (VC for short) is the organic film-forming additive with the most in-depth research and ideal effect. Actual observations show that VC undergoes free radical polymerization on the surface of the carbon negative electrode to form polyalkyllithium carbonate, thereby effectively inhibiting the co-insertion reaction of solvent molecules, while having no side effects on the positive electrode (Acta Electrochemical Sinica, 47(9), 1423(2002) , b. Aubach, K...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D317/40
Inventor 陈学思胡翼飞赵超黄景琴庄秀丽项盛陈文启
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES