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Ion liquid of quaternaries of naphthenic acid

A technology of ionic liquids and quaternary ammonium salts, applied in the field of chemical industry, can solve the problems of difficult purification of ionic liquid products and unfriendly environment

Inactive Publication Date: 2007-10-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of the two-step synthesis method is that it is universal, but the biggest problem in the synthesis is that the anion exchange reaction will produce inorganic salt by-products, which are not environmentally friendly during the preparation process.
At the same time, it is unavoidable that a small amount of inorganic salt impurities are difficult to measure and remove, which causes certain difficulties in the purification of ionic liquid products.

Method used

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  • Ion liquid of quaternaries of naphthenic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Accurately weigh 2.563 g of 0.02 mol of cyclohexane carboxylic acid, put it into a round bottom flask, then add 10 ml of ethanol therein as a reaction medium, and stir sufficiently to completely dissolve the cyclohexane carboxylic acid to obtain a clear and transparent homogeneous solution. Then, under the condition of stirring, 5.246 g of 45 wt % choline solution was slowly added dropwise therein. Reaction at room temperature for 18h. The reactants were evaporated in vacuum at 50°C for 90 minutes to remove most of the ethanol, and then the obtained liquid was dried in a vacuum oven at 50°C for 48 hours to finally obtain 4.367 g of a colorless, viscous liquid product.

Embodiment 2

[0012] Accurately weigh 2.763g of salicylic acid, put it into a round bottom flask, add 10ml of ethanol therein as a reaction medium, and stir fully to completely dissolve the salicylic acid to obtain a clear and transparent homogeneous solution. Then, under the condition of stirring, 5.306 g of 45 wt % choline solution was slowly added dropwise therein. The reaction was carried out for 20 h at a temperature of 25°C. The reactant was evaporated in vacuo at 50°C for 60 minutes to remove most of the ethanol, and then the obtained liquid was dried in a vacuum oven at 50°C for 48 hours to finally obtain 4.526 g of a light yellow, viscous liquid product.

Embodiment 3

[0014] Accurately weigh 2.585 g of cyclohexane carboxylic acid, put it into a round bottom flask, then add 5 ml of methanol as the reaction medium, and stir fully to completely dissolve the cyclohexane carboxylic acid to obtain a clear and transparent homogeneous solution. Then, under the condition of stirring, 8.401 g of methanol solution of 40 wt % benzyltrimethylammonium hydroxide was slowly added dropwise thereto. Under the temperature condition of 20 ℃, react for 22h. The reactants were evaporated in vacuo at 40°C for 90 minutes to remove most of the methanol, and then the obtained product was dried in a vacuum oven at 50°C for 48 hours to finally obtain 5.210 g of the product.

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Abstract

This invention discloses a method for preparing naphthenic acid quaternary ammonium salt ionic liquid. The method adopts one of naphthenic acid compounds as the anion donor, one of tertiary amine or quaternary ammonium alkali compounds as the cation donor, and one or more of water, methanol, ethanol, isopropanol, acetone and cyclohexane as the reaction medium. At normal temperature and pressure, the anion donor and the cation donor at a mol. Ratio of 1:1 are subjected to one-step neutralization reaction to obtain naphthenic acid quaternary ammonium salt ionic liquid. The method has such advantages as easy operation, high efficiency and no byproducts. The obtained naphthenic acid quaternary ammonium salt ionic liquid has such advantages as high electric conductivity, high heat resistance and wide electrochemical stable range.

Description

[0001] Field of the invention: the present invention relates to the synthesis of a naphthenic acid quaternary ammonium salt ionic liquid in the field of chemistry and chemical engineering. Background of the invention: [0002] Ionic liquids are compounds composed of organic cations and inorganic or organic anions that are liquid at room temperature and adjacent temperatures. [0003] Compared with traditional organic solvents and electrolytes, ionic liquids have a series of outstanding advantages: (1) almost no vapor pressure at room temperature, non-volatile, can be used for reactions under high vacuum conditions, and can reduce the environment caused by volatilization Pollution problem; (2) has good chemical, thermodynamic stability and suitable viscosity, can be used as the stationary phase of liquid chromatography; (3) has high designability, can change the size of anion and cation, the length of alkyl chain Adjust its polarity, pH and its solubility to inorganic substance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/62C07F9/44
Inventor 张锁江于英豪姚宏玮
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI