Preparation method of ionic liquid

A technology of ionic liquids and intermediates, applied in the field of preparation of ionic liquids, to achieve the effects of improved application prospects, wide electrochemical window, good ionic conductivity and thermal conductivity

Inactive Publication Date: 2015-12-09
侯颖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are relatively few reports and studies on the preparation methods of ionic liquids in the field of electrochemistry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Add 1 mol of N-methylimidazole to a three-necked flask under nitrogen protection, heat the three-necked flask to 70°C, keep the temperature constant, and turn on magnetic stirring at a stirring speed of 100rpm;

[0017] 2) Slowly add 1 mol of n-bromobutane dropwise within 15 hours by the constant pressure funnel method, and use a spherical condenser tube to condense and reflux during the reaction process;

[0018] 3) After the reaction time is up, oily crystals are obtained, which are filtered and washed with ethyl acetate solvent to obtain a reaction intermediate;

[0019] 4) Add the reaction intermediate to the three-necked flask, add 150ml of distilled water, and stir until the above reaction intermediate is completely dissolved;

[0020] 5) Add 1.1 mol of ammonium hexafluorophosphate to the three-necked flask, mechanically stir for 4 hours at 25°C, let stand to separate layers, wash the lower organic phase with distilled water for 4 times, and then dry it;

[00...

Embodiment 2

[0024] 1) Add 1.5mol of N-ethylimidazole to a three-necked flask under nitrogen protection, heat the three-necked flask to 60°C, keep the temperature constant, and turn on magnetic stirring at a stirring speed of 120rpm;

[0025] 2) Slowly add 1.5 mol of n-pentane bromide dropwise within 20 hours through the constant pressure funnel method, and use a spherical condenser tube to condense and reflux during the reaction process;

[0026] 3) After the reaction time is up, oily crystals are obtained, which are filtered and washed with butyl acetate solvent to obtain a reaction intermediate;

[0027] 4) Add the reaction intermediate to the three-necked flask, add 240ml of distilled water, and stir until the above reaction intermediate is completely dissolved;

[0028] 5) Add 1.8 mol of ammonium hexafluorophosphate into the three-necked flask, mechanically stir for 5 hours at 25°C, let stand to separate layers, wash the lower organic phase with distilled water for 6 times, and then d...

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PUM

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Abstract

The invention mainly relates to a preparation method of ionic liquid. According to the method, imidazole and chloralkane serve as raw materials, intermediates are generated under the protection of nitrogen, then ammonium hexafluorophosphate is utilized for performing an ion exchange reaction, products are generated, and finally after the products are purified, the finished ionic liquid can be obtained. The ionic liquid prepared through the method has good ionic conductivity and thermal conductivity, and particularly because an electrochemical window is wide, the application prospects of the ionic liquid in an electrochemical reaction are substantially improved.

Description

field of invention [0001] The invention relates to the field of synthesis of ionic liquids, in particular to a method for preparing ionic liquids capable of significantly improving the electrochemical reaction window. Background technique [0002] Ionic liquid refers to a liquid composed entirely of ions, a substance composed of ions that is liquid at room temperature or near room temperature, called room temperature ionic liquid, room temperature molten salt. In ionic compounds, the force between anions and cations is the Coulomb force, and its magnitude is related to the charge quantity and radius of the anions and cations. The larger the ionic radius, the smaller the force between them, and the higher the melting point of the ionic compound. Low. The anions and cations of some ionic compounds are bulky and loose in structure, resulting in low force between them, so that the melting point is close to room temperature. In the ionic liquids studied at home and abroad, the ...

Claims

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Application Information

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IPC IPC(8): C07D233/58
CPCC07D233/58
Inventor 侯颖
Owner 侯颖
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