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Method and device for rapidly preparing ionic liquid by using microwaves to promote synthesis

A technology for ionic liquids and synthetic reactions, which is applied in the field of rapidly manufacturing ionic liquids and obtaining high-yield ionic liquids, and can solve problems such as hindering the application of ionic liquids, long reaction time, and high cost

Inactive Publication Date: 2012-03-14
KUN SHAN UNIVERSITY
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Problems solved by technology

[0005] However, the existing ionic liquids are using traditional chemical synthesis methods, and the high cost of methylimidazole raw materials is the main reason hindering the application of ionic liquids, and then the chemical synthesis requires a long reaction time (24 to 72 hours). And problems such as excessive use of alkanes

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  • Method and device for rapidly preparing ionic liquid by using microwaves to promote synthesis
  • Method and device for rapidly preparing ionic liquid by using microwaves to promote synthesis
  • Method and device for rapidly preparing ionic liquid by using microwaves to promote synthesis

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Embodiment Construction

[0038] In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific examples.

[0039] Please refer to Figure 1 to Figure 3 shown, where figure 1 It is a schematic flow chart of the steps of the present invention. It includes the following steps, which are described in detail below:

[0040] a. Methylimidazole and butyl bromide are dropped into the synthesis reaction flask 4, the electronic stirring bar 2 of the reactant is stirred and mixed and the cooling port reflux device 3 is cooled and recovered;

[0041] b. Using a microwave reactor 1 to promote the rapid synthesis of an ionic liquid from the above reactants, the reaction time is 1 to 5 minutes, and the microwave power is 240W;

[0042] c. Put the above-mentioned ionic liquid into a static separation tank 5 and let it stand for about 5 to 10 minutes to separate it into an upper layer unreacted substance and a lower layer reactan...

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Abstract

The invention discloses a method and device for rapidly preparing an ionic liquid by using microwaves to promote synthesis. According to the invention, after mixing methylimidazole and bromobutane, in the first stage, promoting the synthesis of methylimidazole and bromobutane by using microwaves, when the molar ratio of methylimidazole to bromobutane is 1:1, a first stage ionic liquid can be prepared by the synthesis of methylimidazole and bromobutane in only 2 minutes with the yield of 86-99 %, and the time is 1 / 720 of the required time in traditional technology; in the second stage, after mixing the first stage ionic liquid with potassium hexafluoro hydrogen phosphate, an anion-replacement reaction is carried out, a second stage ionic liquid can be prepared in 2.5 minutes with the yield of 90 %, and the time is 1 / 576 of the required time in traditional technology. The use of the invention can rapidly synthesized the first stage ionic liquid, and simultaneously can carry out anion-replacement on the first stage ionic liquid rapidly to obtain the second stage ionic liquid, and after the total reaction time of 4.5 minutes, the yield of the ionic liquid can reach to more than 90 %.

Description

technical field [0001] The invention relates to a method and equipment for promoting the synthesis reaction of methylimidazole and bromobutane by using two-stage microwaves, which are mainly used for rapidly producing ionic liquids and obtaining high-yield ionic liquids. Background technique [0002] Ionic liquids are widely used in chemistry because of their extremely low vapor pressure, low melting point, high polarity, non-flammability, strong acid resistance, high thermal stability, high electrical conductivity, good electrochemical properties and wide liquid temperature range (-96~400°C) and other special properties, so it can replace the commonly used volatile organic solvents (Volatile Organic Compounds, VOCs) and be used in chemical synthesis. [0003] Ionic liquids can be operated under normal pressure, which can not only reduce operating costs, but also eliminate the pollution of volatile organic solvents to the environment, avoid the risk of operators being expose...

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Application Information

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IPC IPC(8): C07D233/56B01J19/12
Inventor 萧明谦郭鼎楠
Owner KUN SHAN UNIVERSITY
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