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A method for continuous extraction and rectification of mixed solvents to separate ethanol-toluene azeotrope

A technology of extractive distillation and mixed solvents, which is applied in the direction of distillation purification/separation, preparation of organic compounds, chemical instruments and methods, etc., and can solve problems such as equipment corrosion

Inactive Publication Date: 2017-03-08
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Extraction and rectification of raw materials by adding inorganic salts to organic solvents, compared with pure use of organic solvents, the separation efficiency is higher, but there are also disadvantages such as inorganic salts may corrode equipment, and ionic liquids can be well avoid this problem

Method used

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  • A method for continuous extraction and rectification of mixed solvents to separate ethanol-toluene azeotrope

Examples

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Comparison scheme
Effect test

Embodiment example 1

[0015] (1) A new process for extraction, rectification and separation of ethanol-toluene azeotrope, the process flow chart is as follows figure 1 shown. The theoretical plate number of extractive distillation column B1 is 80. With 90wt% N-methylpyrrolidone and 10wt% [Emim] [BF 4 ] As a mixed extractant, add from the 5th theoretical plate, the flow rate is 400kg / hr. The mixture of ethanol and toluene is added from the 42nd theoretical plate, the flow rate is 100kg / hr, the mass fraction of ethanol is 68%, B1 is operated under normal pressure, the top reflux ratio is 7:1, and the top temperature is 60 ~70°C, the temperature of the tower bottom is 160~180°C, the top product is analyzed by gas chromatography, and the ethanol product with a purity higher than 99.5% is obtained. (2) The contents of the bottom of the extractive distillation tower B1 enter the solvent recovery tower B2. The solvent recovery tower has 50 theoretical plates. ~200°C. The purity of the toluene obtaine...

Embodiment example 2

[0017] (1) The process flow of the two towers of the extractive distillation tower is the same as in Example 1. With 90wt% N-methylpyrrolidone and 10wt% [Bmim] [BF 4 ] Do mixed extractant, B1 theoretical plate number is 70, feeds from the 3rd theoretical plate, flow rate is 500kg / hr. The mixture of ethanol and toluene is added from the 65th theoretical plate, the flow rate is 100kg / hr, and the composition is the same as in Example 1. B1 operates at normal pressure with a reflux ratio of 8:1. At this time, the temperature at the top of the tower is 60-80°C, and the temperature at the bottom of the tower is 160-180°C. The top product is analyzed by gas chromatography to obtain an ethanol product with a purity higher than 99.5%. (2) The contents of the bottom of the extractive distillation tower B1 enter the solvent recovery tower B2. The solvent recovery tower has 40 theoretical plates. 180~200℃. The purity of the toluene obtained at the top of the tower is more than 99%, a...

Embodiment example 3

[0019] The two-tower flow process of the extractive distillation tower is the same as the implementation case 1, and the extractant is selected from 90wt% N-methylpyrrolidone, 5wt% [Bmim] [BF 4 ], and 5wt%[Emim][BF 4 ] Composition of the mixture.

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Abstract

The invention relates to a method for continuous extractive distillation and separation of ethanol-toluene azeotrope with a mixed solvent. Extractive distillation generally adopts a double-tower process, and the double towers comprise an extractive distillation tower and a solvent recovery tower. The production capacity of the extractive distillation tower needs a reasonable technological process and a tower structure and also has requirements on factors such as the dosage ratio of raw materials and an extraction agent and the feeding position. Aiming at the ethanol-toluene azeotrope system, the method adopts a mixed solution of N-methyl-2-pyrrolidone and ionic liquid [Emim] [BF4] and [Bmim][BF4] as an extracting agent, and finally the separation of ethanol and toluene is realized.

Description

technical field [0001] The invention relates to a method for continuous extraction and rectification of mixed solvents to separate ethanol-toluene azeotropes. A mixed liquid composed of ionic liquid and organic solvent is used as an extraction agent to realize rectification and separation of ethanol-toluene azeotropes. Background technique [0002] Ethanol and toluene are important organic solvents and chemical raw materials, but there is an azeotropic phenomenon in the mixture of the two, and ordinary distillation methods cannot be completely separated. Therefore, it is very necessary to realize the separation research of the two azeotropes. [0003] Ionic liquids refer to liquid salt compounds composed of organic cations and anions at room temperature. They have the advantages of low vapor pressure, low melting point, wide liquid range, easy operation, and good stability. Adding ionic liquids to solvents can enhance the relative volatility of the two azeotropic components...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/08C07C29/84C07C15/06C07C7/08
CPCC07C7/08C07C29/84C07C31/08C07C15/06
Inventor 姜占坤刘顺江孙国新
Owner UNIV OF JINAN