Preparation method of vinylene carbonate

Abstract

The invention belongs to the field of synthesis of vinylene carbonate, and particularly relates to a preparation method of vinylene carbonate. The method comprises the following steps: 1) carrying out hydrogen chloride elimination reaction on chloroethylene carbonate and excessive triethylamine in the presence of a polymerization inhibitor without a solvent, and carrying out solid-liquid separation to obtain a reaction solution containing triethylamine; and 2) distilling the reaction solution containing triethylamine, and separating out unreacted triethylamine and vinylene carbonate in sequence. According to the preparation method of the vinylene carbonate, the hydrogen chloride elimination reaction is carried out under the solvent-free condition, so that the subsequent solvent removal is reduced; the reaction solution containing triethylamine is a vinylene carbonate crude product, the unreacted triethylamine and the product can be obtained through distillation, rectification is not needed, and the yield and the purity of the product are high. The whole process is low in environmental pollution, high in operability, high in production safety, low in input cost and very suitable for industrial production.

Description

technical field [0001] The invention belongs to the synthesis field of vinylene carbonate, and in particular relates to a preparation method of vinylene carbonate. Background technique [0002] Vinylene carbonate, also known as 1,3-dioxol-2-one or ethylene carbonate, is a colorless and transparent liquid, an important intermediate in organic synthesis, and an electrolyte for lithium-ion batteries Additives can significantly prolong the cycle life of lithium-ion batteries and improve the storage resistance of batteries. [0003] At present, the main methods of producing vinylene carbonate are as follows: [0004] The first: take ethylene carbonate and thionyl chloride as raw materials, carbon tetrachloride as a solvent, trigger under light to prepare chloroethylene carbonate, and then use chloroethylene carbonate and triethylamine as raw materials, Ester solvents are used as solvents to prepare vinylene carbonate. The disadvantage of this method is that carbon tetrachlorid...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that carbon tetrachloride is an internationally prohibited reagent, does not meet the requirements of green production, and cannot be used for industrialized production;

[0007] The third method: gas-phase ethylene carbonate is prepared by high-temperature cracking. The disadvantage of this method is that the reaction conditions are harsh, the yield is low, and the requirements for equipment are very high, which is not conducive to industrial production;

[0008] The fourth type: gas-phase ethylene carbonate is prepared by oxidation at high temperature. The disadvantages of this method are low yield, high equipment requirements, poor controllability and repeatability