Y aromatic ligand ionic liquid and preparation method thereof

An ionic liquid and aromatic technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve the difficulty of product purification and is not suitable for large-scale industrial production applications , high cost of raw materials and other issues, to achieve the effect of low price, low cost and short reaction time

Inactive Publication Date: 2011-01-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing ionic liquid preparation methods have problems such as high cost of raw materials, difficulty in product purification, and unsuitability for large-scale industrial production applications. The cost of raw materials is generally more than twice that of commonly used organic solvents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of Y aromatic ligand-type ionic liquid: 3.395g (0.03mol) of caprolactam and 0.4239g (0.01mol) of lithium chloride are mixed and heated, heated to 120°C until a colorless, clear and transparent liquid is obtained and kept for 1.5h to obtain an ionic liquid Li[C 6 h 11 NO] 3 Cl. After testing, Li[C 6 h 11 NO] 3 The conductivity of Cl at 60°C is 0.31×10 3 μS / cm, the freezing point is 38°C. IP, v, cm-1: 3220, 2933, 2224, 1623, 1487, 1438, 1366, 1336, 1127. Because the boiling point of caprolactam is as high as 270°C, the ionic liquid prepared by this method can be used at high temperature.

Embodiment 2

[0020] A preparation method of Y aromatic ligand-type ionic liquid: 4.526g (0.04mol) of caprolactam and 0.4239g (0.01mol) of lithium chloride are mixed and heated, heated to 120°C until a colorless, clear and transparent liquid is obtained and kept for 1.5h to obtain an ionic liquid Li[C 6 h 11 NO] 4 Cl. After testing, Li[C 6 h 11 NO] 4 The conductivity of Cl at 60°C is 0.47×10 3 μS / cm, the freezing point is 46°C. IR, v, cm-1: 3220, 2933, 2224, 1630, 1481, 1438, 1366, 1336, 1127.

Embodiment 3

[0022] A method for preparing a Y aromatic ligand-type ionic liquid: 3.395 g (0.03 mol) of caprolactam and 0.8685 g (0.01 mol) of lithium bromide are mixed and heated, heated to 110 ° C until a colorless, clear and transparent liquid is obtained and kept for 2 hours to obtain an ionic liquid Li[C 6 h 11 NO] 3 Br. After testing, Li[C 6 h 11 NO] 3 The conductivity of Br at 60°C is 0.26×10 3 μS / cm, the freezing point is 54°C. IR, v, cm-1: 3220, 2933, 2231, 1618, 1493, 1438, 1366, 1336, 1127.

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Abstract

The invention discloses a Y aromatic ligand ionic liquid and a preparation method thereof. The ionic liquid has the structural formula of (Y-ligand)n.LiX, wherein Y-ligand is a Y aromatic compound selected from one of caprolactam, N,N-dimethyl acetamide, urea and thiocarbamide; X stands for Cl, Br or I; and n=2-5. The preparation method comprises the following steps: evenly mixing inorganic salt LiX and the Y aromatic compound in the mol ration of 1:2-5, heating to 70-150 DEG C, keeping for 1-4 hours, and cooling to obtain the Y aromatic ligand ionic liquid. The ionic liquid is hopeful to become a novel conducting material and be widely used for organic synthesis. The invention has the advantages of simple preparation technique, accessible raw material, low cost, no pollutant discharge in reaction, and no byproduct, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to an ionic liquid, in particular to a Y aromatic ligand-type ionic liquid and a preparation method thereof, belonging to the technical field of new chemical materials and their preparation. Background technique [0002] At present, domestic and foreign literature defines ionic liquids (Ionic Liquids) as salts that are completely composed of ions and are liquid at low temperatures (generally below 150 ° C), also known as low-temperature molten salts, which are generally composed of larger organic cations. and smaller inorganic anions. Cation such as: quaternary ammonium, quaternary phosphine, alkylimidazole, alkylpyrrole and alkylpyridine, etc.; anion such as: Cl - , SO 4 2- , NO 3 - 、Br - , BF 4 - 、PF 6 - , (CF 3 SO 2 ) 2 N - and CF 3 COO - Wait. According to this definition, ionic liquids should be pure compounds. But for some ionic liquids, such as the liquid generated by mixing anhydrous aluminum trichloride ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F1/02B01J31/22
Inventor 林鹿陈天明庄军平
Owner SOUTH CHINA UNIV OF TECH
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