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Extraction separation method for methacrylic acid by using ionic liquid

A methacrylic acid, ionic liquid technology, applied in the separation/purification of carboxylic acid compounds, organic chemistry and other directions, can solve the problems of low extraction capacity of methacrylic acid, environmental and safety problems, a large number of extractants, etc., to achieve strong extraction capacity , hazard reduction, high selectivity effect

Inactive Publication Date: 2015-10-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the extraction agents currently used are volatile organic solvents (VOC), which are volatile and may cause environmental and safety problems during use.
What is more critical is that these organic solvents have low extraction capacity for low-concentration methacrylic acid, and a large amount of extractant is required to completely recover methacrylic acid in water

Method used

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  • Extraction separation method for methacrylic acid by using ionic liquid
  • Extraction separation method for methacrylic acid by using ionic liquid
  • Extraction separation method for methacrylic acid by using ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Add 10 g of 1% methacrylic acid aqueous solution and 5 g of [C 6 MIM](CF 3 SO 2 ) 2 The N ionic liquid was heated by a circulating water bath, and the temperature was controlled at 298.15K. The glass kettle was placed on a magnetic stirrer, and after magnetic stirring for 20mim, the magnetic stirrer was turned off and left to stand. The system is divided into two layers, the upper layer is the water phase, and the lower layer is the ionic liquid phase. The water phase and the ionic liquid phase are sampled respectively, and the contents of methacrylic acid and ionic liquid in the sampling are analyzed by ultra-high liquid chromatography. 1 and x 2 , and then calculate the water content x in the two phases by the difference method 3 . The specific measurement results are: in the lower ionic liquid phase, in the upper aqueous phase x 2 W = 0 , x 3 ...

Embodiment 2

[0014] Take 2g mass fraction of 40% methacrylic acid aqueous solution and 1g [CH 3 -N-(C 8 h 17 ) 3 ]Cl ionic liquid is placed in a jacketed glass kettle, heated by a circulating water bath, and the temperature is controlled at 298.15K. The glass kettle is placed on a magnetic stirrer and stirred and mixed for 20mim, and then the magnetic stirrer is turned off to stand for stratification. The upper layer is ionic liquid phase, the lower layer is the water phase. The two phases are sampled respectively, and the content of methacrylic acid and ionic liquid in the sample is analyzed by ultra-high liquid chromatography to be x respectively 1 and x 2 , and then calculate the water content x in the two phases by the difference method 3 . The specific measurement results are: in the upper ionic liquid phase, x 1 I L = 0.41 , x 2 ...

Embodiment 3

[0016] Take 10g mass fraction of 1% methacrylic acid aqueous solution and 5g of [CH 3 -N-(C 8 h 17 ) 3 ]Cl ionic liquid is placed in a jacketed glass kettle, heated by a circulating water bath, and the temperature is controlled at 298.15K. The glass kettle is placed on a magnetic stirrer and stirred and mixed for 20mim, and then the magnetic stirrer is turned off to stand for stratification. The upper layer is ionic liquid phase, the lower layer is the water phase. The two phases are sampled respectively, and the content of methacrylic acid and ionic liquid in the sample is analyzed by ultra-high liquid chromatography to be x respectively 1 and x 2 , and then calculate the water content x in the two phases by the difference method 3 . The specific measurement results are: in the upper ionic liquid phase, x 1 I L = 0.022 , x 2 ...

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Abstract

This invention relates to an extraction separation method for a methacrylic acid(MAA)-water system by using a hydrophobic ionic liquid. The method comprises the following steps: separating methacrylic acid from an aqueous methacrylic acid solution by using an intermittent or continuous extraction method with the hydrophobic ionic liquid as an extraction agent at a temperature of 273.15 to 353.15 K, wherein a mass fraction of the methacrylic acid in the aqueous methacrylic acid solution is 0.1% to 50%; the usage amount of the extraction agent--the ionic liquid accounts for 10% to 100% of the mass of the aqueous methacrylic acid solution; and the ionic liquid as the extraction agent is a hydrophobic imidazole ionic liquid or a hydrophobic amine ionic liquid. The method in the invention has good separation effect; the extraction agent-the ionic liquid has strong extraction ability; meanwhile, regulation of a system pH value and addition of an organic solvent are not needed in separation process, so operation is simple; and the ionic liquid is insusceptible to volatilization and has low harm to the environment and human body.

Description

Technical field: [0001] The invention belongs to the field of acid-water system separation, in particular to a method for extracting and separating methacrylic acid-water system by using hydrophobic ionic liquid. Background technique: [0002] Methacrylic acid (MAA) is an important chemical product and an intermediate in organic synthesis. The synthesis of methacrylic acid from coal-based raw materials is a newly developed green process in recent years. In the production process of methacrylic acid, an aqueous solution of methacrylic acid is obtained. Separation of methacrylic acid and water, because methacrylic acid and water can form an azeotrope, they cannot be separated by simple rectification. In addition, the water content in the obtained methacrylic acid aqueous solution is between 60% and 80%. The separation of methacrylic acid and water consumes a lot of energy and is poor in economy, and methacrylic acid is easy to polymerize at high temperature. Therefore, it is ...

Claims

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Application Information

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IPC IPC(8): C07C51/48C07C51/44C07C57/07
CPCC07C51/48C07C51/44C07C57/04
Inventor 闫瑞一白银鸽张香平王蕾韩军兴张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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