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Method for separating alcohol-water system by extracting through using hydrophobic Fe-based ionic liquid

A technology of iron-based ionic liquid and water system, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of high energy consumption, inability to meet clean production, large investment, etc., and achieve recycling , low saturated vapor pressure and high extraction selectivity

Active Publication Date: 2013-08-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional chemical separation technology has large investment and high energy consumption, which accounts for a high proportion of the equipment investment and operating costs of chemical plants. With the continuous improvement of environmental protection requirements in recent years, traditional volatile organic solvents that are harmful to the environment and human body Can no longer meet the requirements of cleaner production

Method used

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  • Method for separating alcohol-water system by extracting through using hydrophobic Fe-based ionic liquid
  • Method for separating alcohol-water system by extracting through using hydrophobic Fe-based ionic liquid
  • Method for separating alcohol-water system by extracting through using hydrophobic Fe-based ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Chlorinated 1-butyl-3-methylimidazole ([bmim]Cl) and ferric chloride hexahydrate (FeCl) in a molar ratio of 1:2 3 ·6H 2 O) as a raw material, placed in an open environment and stirred for 24 hours, and removed the water phase after centrifugation to obtain the hydrophobic ionic liquid [bmim]FeCl 4 ([n-C 4 h 9 -C 3 h 3 N 2 -CH 3 ]FeCl 4 ), and dried in a vacuum oven at 343.2K for 24 hours before use.

[0046] Add 10 g of ionic liquid [bmim]FeCl to a jacketed mixing kettle 4 , 10g deionized water and 1g ethanol, control the system temperature to 273.2K±0.1K through an ice bath device, place the mixing kettle on a magnetic stirring device, stir magnetically for 2 hours and then let it stand to achieve phase equilibrium.

[0047] The system is divided into two layers, and the upper water-rich phase and the lower ionic liquid-rich phase are sampled and analyzed, and the upper and lower phase samples taken out are diluted with deionized water to ionic liquid [bmim]Fe...

Embodiment 2

[0057] Separation was carried out in a method similar to that of Example 1, except that the temperature of the system was controlled at 298.2K.

[0058] As a result, the hydrophobic ionic liquid [bmim]FeCl 4 The selectivity to ethanol is 6.47, and the distribution coefficient of ethanol in the upper and lower phases is 0.1047.

Embodiment 3

[0060] Separation was carried out in a method similar to that of Example 1, except that the temperature of the system was controlled at 313.2K.

[0061] As a result, the hydrophobic ionic liquid [bmim]FeCl 4 The selectivity to ethanol is 19.28, and the distribution coefficient of ethanol in the upper and lower phases is 0.1354.

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Abstract

The invention relates to a method for separating an alcohol-water system by extracting through using a hydrophobic Fe-based ionic liquid. The method comprises the following steps: 1, mixing the Fe-based ionic liquid with a C2-C4 alcohol-water solution system under stirring to obtain a mixed solution, wherein the mixed solution comprises 25-47.6mass% of the Fe-based ionic liquid, 4.76-50mass% of alcohol, and the balance; and 2, maintaining the temperature of the mixed solution constant in a range of 273.2-333.2K for dividing the mixed solution into two layers comprising a water phase and an alcohol-extracted Fe-based ionic liquid, and carrying out two-layer separation which means alcohol-water separation, wherein the Fe-based ionic liquid has a structure represented by [R-C3H3N2-R']FeCl4, R is a C4-C8 alkyl group, and R' is a methyl group. The method has the advantages of no need of the adjustment of the pH value of the system or the addition of an organic solvent, good separation effect, low energy consumption, and low saturated vapor pressure, difficult volatilization and harmlessness to the human body of the ionic liquid.

Description

technical field [0001] The invention relates to a method for separating an alcohol-water system, in particular to a method for extracting and separating an alcohol-water system by using a hydrophobic iron-based ionic liquid. Background technique [0002] On the one hand, efficient alcohol-water separation technology can increase the yield of alcohol to meet the growing demand of industrial production. Lower alcohols such as C2-C4 alcohols are important industrial raw materials. Absolute ethanol is an important basic chemical raw material and solvent, which is widely used in production, and its recycling is an important issue in industry. On the other hand, alcohols represented by n-butanol are commonly used recrystallization solvents in the pharmaceutical industry, and can be recycled only after dehydration treatment, so their recycling is an important issue in the pharmaceutical field. However, the traditional chemical separation technology has large investment and high e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/86C07C31/08C07C31/12
Inventor 余江解美莹彭超云
Owner BEIJING UNIV OF CHEM TECH
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