Method for using mixed solvent to separate ethyl alcohol-acetic acid isopropyl ester azeotrope by continuous extractive distillation

A technology of isopropyl acetate, extraction and rectification, which is applied in the field of continuous extraction and rectification of mixed solvents to separate ethanol-isopropyl acetate azeotrope, can solve problems such as equipment corrosion, and achieve the effect of low energy consumption and high purity

Inactive Publication Date: 2015-12-30
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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  • Method for using mixed solvent to separate ethyl alcohol-acetic acid isopropyl ester azeotrope by continuous extractive distillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0015] (1) A new process of ethanol-isopropyl acetate azeotrope extraction, rectification and separation, 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 isopropyl acetate is added from the 42nd theoretical plate, the flow rate is 100kg / hr, the mass fraction of ethanol is 50%, B1 is operated under normal pressure, the top reflux ratio is 7:1, the top The temperature is 70-80°C, the temperature of the tower bottom is 160-180°C, and the top product is analyzed by gas chromatography to obtain an ethanol product with a purity higher than 99.5%. (2) The bottom of the extractive distillation tower B1 enters the solvent recovery tower B2. The solvent recovery tower has 50 theoretical plates. ~200°C. The purity of the isopropyl acetate o...

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 80, feeds from the 3rd theoretical plate, flow rate is 500kg / hr. The mixture of ethanol and isopropyl acetate 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 6:1. At this time, the temperature at the top of the tower is 70-80°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 isopropyl acetate obtained at the top of the tower...

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 discloses a method for using a mixed solvent to separate an ethyl alcohol-acetic acid isopropyl ester azeotrope by continuous extractive distillation. The method comprises the following steps of adopting a mixture of an organic solvent and ionic liquid as an extraction agent; adopting a continuous extractive distillation method to separate the ethyl alcohol-acetic acid isopropyl ester azeotrope, wherein the operation condition of an extractive distillation tower is characterized in that the mass ratio of the extraction agent and incoming materials is 1-10:1, different temperatures and different reflux ratios of tower tops of the continuous extractive distillation tower and a solvent recovery tower are controlled, ethyl alcohol is extracted from the tower top of the extractive distillation tower, acetic acid isopropyl ester is extracted from the tower top of the solvent recovery tower, and the extraction agent on the tower bottom enters into the extractive distillation tower to be recycled. The invention has the advantage that the novel extraction agent is adopted to break an ethyl alcohol-acetic acid isopropyl ester azeotrope system, so that the high-purity ethyl alcohol and acetic acid isopropyl ester product is separated. The continuous distillation efficiency is high, the yield is large, and the solvent recovery is simple.

Description

technical field [0001] The invention relates to a method for continuous extraction and rectification of mixed solvents to separate ethanol-isopropyl acetate azeotrope, using a mixed liquid composed of ionic liquid and organic solvent as an extraction agent to realize the refinement of ethanol-isopropyl acetate azeotrope distillation separation. Background technique [0002] Ethanol is an organic substance, commonly known as alcohol, with a simplified structure CH 3 CH 2 OH, molecular formula C 2 h 6 O is a saturated monohydric alcohol with a hydroxyl group. It is a flammable and volatile colorless transparent liquid at normal temperature and pressure. Its aqueous solution has the smell of wine and has a slightly pungent smell. Ethanol has a wide range of uses. Ethanol can be used to make acetic acid, beverages, flavors, dyes, fuels, etc. Ethanol with a volume fraction of 70%-75% is also commonly used as a disinfectant in medical treatment. It is widely used in national ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/84C07C67/54C07C69/14
CPCC07C29/84C07C67/54C07C31/08C07C69/14Y02P20/54
Inventor 马守涛刘瑶瑶姜占坤孙国新崔玉
Owner UNIV OF JINAN
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