A kind of method that microchannel reaction prepares vinylene carbonate

Abstract

The invention provides a method for preparing vinylene carbonate through micro channel reaction. The method comprises the following steps: (1) preparing equipment, including an enhanced mass transfer micro channel reactor, a metering pump I, a metering pump II and a micro filter, wherein the enhanced mass transfer micro channel reactor comprises a preheater I, a preheater II, an ultrasonic device and a micro channel module; (2) uniformly mixing chloroethylene carbonate with an ester solvent so as to obtain a mixed liquid, synchronously inputting the preheated mixed liquid and triethylamine into a micro channel, heating, mixing, performing reaction, discharging a product obtained after the reaction is completed from a discharge valve, filtering so as to obtain a crude product, and rectifying the crude product into a rectifying still, so as to obtain the vinylene carbonate, wherein the mole ratio of the chloroethylene carbonate to the triethylamine is 1:(1.5-2.0). The method is simple, convenient and safe to operate, relatively small in quantity of byproducts, small in single solvent consumption, low in moisture content, relatively high in product purity and yield, small in environment pollution and applicable to industrial large-scale production, and continuous production can be achieved.

Description

technical field [0001] The invention relates to a preparation method for preparing vinylene carbonate, in particular to a method for preparing vinylene carbonate by microchannel reaction. Background technique [0002] Lithium-ion battery is a new type of green energy, which is widely used in energy storage products such as communications, household appliances, electric tools, electric bicycles, electric vehicles, solar energy, and wind power generation, and has broad development prospects. Adding some additives to lithium-ion batteries can improve the performance of the battery in all aspects. As an organic film-forming additive and overcharge protection additive for lithium-ion battery electrolyte, vinylene carbonate has good high and low temperature performance and anti-flatulence function. At the same time, vinylene carbonate can form a dense electrolyte film between the positive and negative electrodes of the lithium battery, thereby improving the charge and discharge ef...

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Problems solved by technology

[0003] At present, the preparation method of vinylene carbonate, such as CN201510922630.9 and CN201410546929.4, belongs to the traditional process. The general process is to dechlorinate chloroethylene carbonate to obtain a crude product, and then refine the crude product to obtain the final product vinylene carbonate. , the existing problem is that the preparation process is complex and cumbersome, the by-products are more, and the moisture is higher, resulting in a low yield of the crude product, and the yield of the crude product will be lower after refining (especially the recrystallization process), and the unit consumption is more. lead to high cost

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