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Synthetic method of functionalized ionic liquid

A technology of ionic liquid and synthesis method, which is applied in the field of synthesis of functional ionic liquid, can solve problems such as equipment decay, water and air instability, easy decomposition, etc., and achieve easy separation, easy recycling and reuse, and high catalytic performance Effect

Inactive Publication Date: 2016-12-14
天津梦龙新能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the 1960s, ionic liquids with better electrochemical stability were produced and gradually used in organic synthesis. Such ionic liquids have good conductivity and properties similar to inorganic salts, but they are unstable to water and air and easily decomposed. , easy to cause corrosion of equipment

Method used

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  • Synthetic method of functionalized ionic liquid

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Experimental program
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Effect test

Embodiment 1

[0013] Add 0.15 mol of N-methylimidazole into a 100 mL three-neck flask equipped with a thermometer and a magnet, add 0.15 mol of concentrated sulfuric acid dropwise under ice bath, and react with magnetic stirring in an oil bath at 80°C for 8 hours under the protection of nitrogen to obtain ions liquid. Wash 3 times with ethyl acetate, and after rotary evaporation, vacuum-dry for 24h to obtain N-methylimidazolium bisulfate [Hmim]HSO 4 , a colorless viscous liquid. The crude product of the ionic liquid is firstly removed by rotary evaporation to remove most of the water, then washed with ethyl acetate, then rotary evaporated, and vacuum-dried to obtain relatively pure N-methylimidazolium bisulfate [Hmim]HSO 4 .

Embodiment 2

[0015] Add 0.15 mol of 2-pyrrolidone into a 100 mL three-necked flask equipped with a thermometer and a magnet, add 0.15 mol of concentrated sulfuric acid dropwise under ice bath, and react with magnetic stirring in an oil bath at 80°C for 4 h under the protection of nitrogen to obtain an ionic liquid. Wash 3 times with ethyl acetate, and after rotary evaporation, vacuum-dry for 24h to obtain 2-pyrrolidone bisulfate [Hnhp]HSO 4 , a colorless viscous liquid. The crude product of the ionic liquid is firstly removed by rotary evaporation to remove most of the water, then washed with ethyl acetate, then rotary evaporated, and dried in vacuum to obtain relatively pure 2-pyrrolidone bisulfate [Hnhp]HSO 4 .

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Abstract

The invention belongs to the technical field of ionic liquid materials, and more specifically relates to a synthetic method of functionalized ionic liquid. The functionalized ionic liquid is prepared by reaction of methylimidazole (or other ionic liquid with the same anions) and concentrated sulfuric acid of the same amount in a certain condition. The method is advantageous in that the synthesized functional ionic liquid has the advantages of high catalysis performance, easy separation of the product, easy recovery, reuse, usage convenience, and the like; the liquid is an ideal substitute of traditional volatile solvents and catalysts, and is a green material or medium; the liquid provides a new opportunity for material chemists to develop new 'soft' function material, and has wide application prospects for chemical industries, pharmaceutical industries, and other respects.

Description

technical field [0001] The invention belongs to the technical field of ionic liquid materials, and in particular relates to a synthesis method of functionalized ionic liquids. Background technique [0002] Ionic Liquids, also known as room temperature ionic liquids, are salts that are liquid at room temperature or low temperature (100°C). It is generally composed of relatively large and asymmetric organic cations and relatively small inorganic anions. Since the number of anions and cations is equal, the overall charge is neutral. Ionic liquids have excellent physical and chemical properties and can be modified and tuned anion and cation structures. The use of ionic liquids as solvents or catalysts in reaction systems has the advantages of no vapor pressure, wide liquid temperature range, easy separation, high efficiency of homogeneous catalysis, easy separation of heterogeneous catalysis, and can be recycled. extensive attention of scholars in the field. The synthesis of ...

Claims

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Application Information

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IPC IPC(8): C07D233/58C07D207/26
CPCY02P20/582C07D233/58C07D207/26
Inventor 张志敏
Owner 天津梦龙新能源技术有限公司