Preparation method of vinylene carbonate

A technology of vinylene carbonate and ethylene carbonate, which is applied in the field of preparation of vinylene carbonate, can solve the problems of hydrogen generation, high reaction temperature, and negative impact of safety protection measures required by equipment, and achieve high yield and simple separation and purification , to overcome the effect of bad influence

Active Publication Date: 2017-12-22
SUZHOU HUAYI NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent avoids the hydrogen chloride, solid waste of salts and coking residues produced during the elimination reaction after the usual use of chlorination, it still produces hydrogen, and the reaction temperature is very high (200°C~600°C), which will Have a great negative impact on the equipment requirements and safety protection measures in the actual production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Vacuumize the 1L four-necked bottle connected with the water separator, and replace it with nitrogen for 3 times. Under nitrogen atmosphere, add 352g of benzene, 176g of ethylene carbonate, and 333g of selenium dioxide; then heat to reflux and divide water for 36 hours, and the reaction ends After cooling to room temperature, suction filtration under reduced pressure, the filter cake was washed with a small amount of benzene, the filtrate and washing liquid were combined, then the benzene was evaporated at normal pressure, and the product vinylene carbonate was obtained by rectification under reduced pressure, with a yield of 43.4%, a purity of 99.93%.

Embodiment 2

[0027] Vacuumize the 1L four-necked bottle connected with the water separator, and replace it with nitrogen for 3 times. Under nitrogen atmosphere, add 352g of benzene, 176g of ethylene carbonate, 333g of selenium dioxide and 0.24g of glacial acetic acid, heat to reflux and divide water for 30 hour, after the end of the reaction, cool to room temperature, filter under reduced pressure, wash the filter cake with a small amount of benzene, combine the filtrate and washing liquid, then steam the benzene at normal pressure, and rectify under reduced pressure to obtain the product vinylene carbonate, the yield 44.1%, purity 99.95%.

Embodiment 3

[0029] Vacuumize the 1L four-necked bottle connected with the water separator, and replace it with nitrogen three times. Under nitrogen atmosphere, add 352g of benzene, 176g of ethylene carbonate, 333g of selenium dioxide and 0.3g of glacial acetic acid, and heat to reflux for 24 hour, after the end of the reaction, cool to room temperature, filter under reduced pressure, wash the filter cake with a small amount of benzene to combine the filtrate and washing liquid, then steam the benzene under normal pressure, and rectify under reduced pressure to obtain the product vinylene carbonate, the yield is 45.1 %, purity 99.95%.

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Abstract

The invention discloses a preparation method of vinylene carbonate, which includes a step of performing a reaction to ethylene carbonate and SeO2 in a solvent under a protective gas atmosphere to prepare the vinylene carbonate, molar ratio of the SeO2 to the ethylene carbonate being 1.1-4:1. The preparation method has simple operation and gentle reaction conditions, is free of byproducts, such as waste gas and solid waste, which cause environment pollution, and has significant advantages.

Description

technical field [0001] The invention belongs to the field of organic film-forming additives and / or overcharge protection additives for lithium-ion battery electrolytes, and in particular relates to a preparation method of vinylene carbonate. Background technique [0002] With the continuous expansion of the use of lithium-ion batteries, the technology of lithium-ion batteries is also improving. Adding some additives to the electrolyte as the "blood" of lithium-ion batteries can improve many performances of the battery. Among them, vinylene carbonate is an organic film-forming additive and overcharge protection additive in the electrolyte, which has good high and low temperature performance and anti-flat function, can increase the stability of the solvent, and effectively inhibit the decomposition of the solvent. Promote the formation of a good SEI film on the graphite negative electrode and improve the cycle performance of the battery. [0003] Vinylene carbonate (VC, Vinyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/40
CPCC07D317/40
Inventor 周龙王小龙顾乃刚汪许诚陆觉明卢正
Owner SUZHOU HUAYI NEW ENERGY TECH CO LTD
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