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Preparation method of vinylene carbonate and method for converting the same to vinylene carbonate

A technology of vinylene carbonate and ethylene carbonate, applied to the preparation of ethylene monochlorocarbonate and its subsequent conversion into the field of vinylene carbonate, can solve problems such as insufficient purity

Inactive Publication Date: 2009-04-29
EVONIK DEGUSSA GMBH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, for some uses, the purity may still be insufficient

Method used

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  • Preparation method of vinylene carbonate and method for converting the same to vinylene carbonate
  • Preparation method of vinylene carbonate and method for converting the same to vinylene carbonate
  • Preparation method of vinylene carbonate and method for converting the same to vinylene carbonate

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Embodiment Construction

[0008] The reaction of ethylene carbonate (EC) with chlorine gas under ultraviolet light ("photochlorination") to form monochloroethylene carbonate (MCEC) is a radical substitution reaction and is described in Scheme 1 below.

[0009]

[0010] The following scheme 2 describes the conversion of ethylene monochlorocarbonate to vinylene carbonate (VC) by (ii) elimination of hydrogen chloride.

[0011]

[0012] Step (a) of the method of the present invention includes the reaction of ethylene carbonate and chlorine gas in a liquid phase under ultraviolet light irradiation. Step (b) involves adding a separate feed of inert gas to the liquid phase.

[0013] Preferably, steps (a) and (b) are performed sequentially, that is, step (b) is performed after step (a).

[0014] At the beginning of the reaction, molten ethylene carbonate typically constitutes the main part of the liquid phase, optionally combined with a suitable solvent as a diluent. Although the liquid phase of the method can...

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Abstract

The invention relates to a method for preparing ethylene carbonate monoxide, which comprises the following steps: (a) reacting ethylene carbonate with chlorine in a liquid phase under UV irradiation; and (b) introducing inert gas to the liquid phase for single feeding. The invention also relates to a method for converting the ethylene carbonate monoxide into vinylene carbonate subsequently.

Description

Technical field [0001] The present invention relates to a method for preparing ethylene monochlorocarbonate from ethylene carbonate, and also relates to a method including further converting ethylene monochlorocarbonate into vinylene carbonate. Background technique [0002] Vinylene carbonate is an important intermediate for synthetic drugs, plant protection agents, polymers, especially paints, and various other chemicals. An important use of vinylene carbonate is as an additive in solutions for batteries, especially lithium-ion batteries. Lithium ion batteries are used, for example, as storage batteries for hybrid electric vehicles. [0003] Generally, a tertiary amine, usually triethylamine, is used in an organic solvent to prepare vinylene carbonate from ethylene monochlorocarbonate by eliminating hydrogen chloride. Ethylene monochlorocarbonate used as a raw material in this elimination reaction is prepared by radical chlorination of ethylene carbonate. Examples of the chlorin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/38C07D317/42
Inventor M·勒姆J·洛茨K·施塔特米勒
Owner EVONIK DEGUSSA GMBH
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