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Efficient preparation method of ionic liquid

An ionic liquid and high-efficiency technology, applied in organic chemistry and other fields, can solve the problems of high production cost, slow product conversion efficiency, and inability to scale production, and achieve the effects of increasing yield, saving reaction time, and improving product conversion rate

Inactive Publication Date: 2017-05-10
北京市合众创能光电技术有限公司
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  • Application Information

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Problems solved by technology

[0003] In order to overcome the existing shortcomings of slow product conversion efficiency, high production cost and incapable of large-scale production, the present invention provides a high-efficiency preparation method of ionic liquid, which solves the problem by ultrasonic cavitation and constant temperature water bath heating

Method used

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Embodiment Construction

[0014] A kind of efficient preparation method of ionic liquid, add EMImBr and LIFSI of molar ratio 1:1.5 in the beaker, EMImBr is 1-ethyl-3-methylimidazole bromide, LiFSI is lithium salt of bisfluorosulfonimide, add phase After the ultrapure water corresponding to 25 times the weight is dissolved, ultrasonic stirring is used to form a high-temperature and high-pressure environment inside the liquid by ultrasonic cavitation to reduce the size of particles in the liquid. The ultrasonic frequency is 26KHz~30KHz, the stirring speed is 400r / min, and the time is 2h. After the stirring is completed, the yield of the oily ionic liquid in the lower layer is 75%. Continue stirring in a constant temperature oil bath with a set temperature range of 65°C~80°C. Step liquid, stirring speed 400r / min, time 4~6h, the volume of the ionic liquid in the oil phase increases significantly after this step, this is because the heating increases the activation energy of microchemical reaction molecules,...

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Abstract

The invention relates to the technical field of preparation of an ionic liquid, and particularly relates to an efficient preparation method of an ionic liquid. The preparation method comprises the following steps: 1, ultrasonic reaction: adding EMImBr and LIFSI into a beaker according to a mole ratio 1:1.5, then adding corresponding 25 times by weight of ultrapure water, dissolving, and performing ultrasonic stirring; 2, thermostatic water bath heating: further stirring the liquid in the step 1 in a constant temperature oil bath at a preset temperature range of 65-80 DEG C; and 3, ionic liquid purification: dissolving the oil phase at the bottom of the beaker with dichloromethane with a volume being two times that of the oil phase product, washing the oil phase with 500ml of ultrapure water, removing excessive halogen in the ionic liquid, and then separating the dichloromethane and ionic liquid mixed solution from the water phase with a separating funnel. According to the invention, ultrasonic cavitation action and thermostatic water bath heating are adopted, so that the reaction efficiency is improved, the product conversion rate is greatly increased, the purification effect is favorable, and the imidazole ionic liquid yield is greatly increased; and the reaction time is saved, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of ionic liquid preparation, in particular to an efficient preparation method of ionic liquid. Background technique [0002] Ionic liquids have become a research hotspot in the field of green solvents in recent years because of their extremely low vapor pressure, high solubility for organic, inorganic, and polymer compounds, wide electrochemical window, and high thermal stability. At present, many studies have shown that the one-step synthesis method has a yield of only 50% to 60% for the yield of ionic liquids, and the product conversion efficiency is slow, which leads to problems such as high production costs and inability to scale production. Contents of the invention [0003] In order to overcome the existing shortcomings of slow product conversion efficiency, high production cost and incapable of large-scale production, the present invention provides a high-efficiency preparation method of ionic liqui...

Claims

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Application Information

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IPC IPC(8): C07D233/58
CPCC07D233/58
Inventor 赵辰顾生刚胡盛华
Owner 北京市合众创能光电技术有限公司