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Method for extracting and separating ethyl acetate-ethanol system using ion liquid

A technology of ionic liquid and ethyl acetate, which is applied in the preparation of carboxylic acid esters, organic chemical methods, chemical instruments and methods, etc., can solve the problems of high production energy consumption, complicated rectification process, equipment corrosion, etc., so as to improve the purity, The process is simple and the effect of not corroding equipment

Inactive Publication Date: 2008-08-20
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of high production energy consumption in the existing extraction and purification ethyl acetate process, complicated rectification process, equipment corrosion and introduction of organic volatile substances, and proposes to use ionic liquid to extract and purify ethyl acetate-ethanol systematic approach

Method used

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  • Method for extracting and separating ethyl acetate-ethanol system using ion liquid
  • Method for extracting and separating ethyl acetate-ethanol system using ion liquid
  • Method for extracting and separating ethyl acetate-ethanol system using ion liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: [AMIM]Cl extraction separation ethyl acetate-ethanol system

[0021] (1) Stir the binary system of ethyl acetate-ethanol and an equal volume of ionic liquid to make it evenly mixed, and let it stand to form an upper phase ethyl acetate phase and a lower phase ionic liquid phase, and ethanol accounts for the molar fraction of the binary system 0.01-0.40.

[0022] (2) Separate the two phases, and use the rotary evaporator to steam the ethyl acetate phase to obtain pure ethyl acetate. The remainder of the rotary evaporator is the recovered ionic liquid, which can be recycled; the ionic liquid phase is used to steam the ethanol with a rotary evaporator And ethyl acetate, the rest of the rotary evaporator is the recovered ionic liquid, which can be recycled.

[0023] (3) the ethyl acetate that step (2) ethyl acetate phase evaporates can also be added in the separatory funnel again, add ionic liquid again, its technical condition is the same as step (1), adopt ...

Embodiment 2

[0031] Embodiment 2: [AMIM] Br extracts and separates ethyl acetate-ethanol system

[0032] According to the method of Example 1, but the mole fractions of the added ethanol in the binary system are 0.1064, 0.1571, 0.2362, 0.2942 respectively, and the added ionic liquid is [AMIM]Br, the distribution ratio and selectivity coefficient results of ethanol are listed in Table 2 .

[0033] Table 2 [AMIM]Br extraction separation of ethyl acetate-ethanol system distribution ratio and selectivity coefficient

[0034] Ethanol (mol fraction)

[0035] As can be seen from Table 2, with the increase of ethanol mole fraction, the distribution ratio and selectivity coefficient of ethanol have the same law as that of Example 1. When the mole fraction of ethanol is the same, [AMIM]Cl has higher distribution ratio and selectivity coefficient than [AMIM]Br.

Embodiment 3

[0036] Embodiment 3: [C 4 mim]Cl extraction and separation of ethyl acetate-ethanol system

[0037] According to the method of Example 1, but the ethanol that adds accounts for the mole fraction of binary system is respectively 0.0828, 0.1622, 0.2971, 0.3285, 0.4011, and the ionic liquid that adds is [C 4 mim]Cl, the distribution ratio and selection coefficient of ethanol are listed in Table 3.

[0038] Table 3 [C 4 Distribution Ratio and Selectivity Coefficient of Ethyl Acetate-Ethanol System Extracted and Separated by mim]Cl

[0039] Ethanol (mol fraction)

[0040] It can be seen from Table 3 that with the increase of ethanol mole fraction, the distribution ratio of ethanol increases, but the selectivity coefficient tends to decrease. When the mole fraction of ethanol is 0.4011, the distribution ratio of ethanol reaches 45.45, and the selectivity coefficient is 2.49. [C 4The range of the molar fraction of ethanol in the mim]Cl extraction system is less than 0.4...

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Abstract

The invention discloses an extracting separating technique of acetic ester-alcohol through ionic liquid, wherein the ionic liquid possesses alcohol to dissolve acetic ester and stratification property of acetic ester; the distribution rate of alcohol in the ionic liquid phase and acetic ester phase reaches 10, which obtain over 99% acetic ester; the ionic liquid needn't evaporating pressure, which can be regenerated simply.

Description

technical field [0001] The invention relates to a method for ionic liquid extraction and separation of ethyl acetate-ethanol system. Background technique [0002] Ethyl acetate is an important fine chemical raw material, which is widely used in the fields of spices, medicine, paints, coatings and adhesives. In recent years, the application of ethyl acetate at home and abroad has grown rapidly. With the further improvement of the environmental protection requirements of domestic coatings and adhesive products, ethyl acetate, as a non-toxic solvent, has been widely valued, so it will further promote the use of ethyl acetate. Esters market growth. In 2004, the total consumption of ethyl acetate in my country was 284,000 tons, but the total production capacity of ethyl acetate production enterprises in my country was 270,000 tons. It is expected that the demand for ethyl acetate will increase rapidly before 2010. [0003] In the industrial process of producing ethyl acetate, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07B63/00C07C67/58C07C29/86C07C31/08C07C69/14
Inventor 陈继邓岳锋张冬丽
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI