Method for separating ethanol-propyl acetate azeotrope through continuous extractive rectification

A technology of extractive distillation and propyl acetate, which is applied in the direction of extractive distillation, carboxylate preparation, chemical instruments and methods, etc., can solve the problems of incomplete separation and achieve the advantages of equipment protection and project investment

Inactive Publication Date: 2015-05-13
UNIV OF JINAN
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] Ethanol and propyl acetate are important organic solvents and chemical raw materials, but the mixture of the two has an azeotropic phenomenon

Method used

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  • Method for separating ethanol-propyl acetate azeotrope through continuous extractive rectification

Examples

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Effect test

Embodiment example 1

[0015] (1) A new process of ethanol-propyl 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% ethylene glycol 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 propyl acetate is added from the 42nd theoretical plate, the flow rate is 100kg / hr, the mass fraction of ethanol is 85%, B1 is operated under normal pressure, the tower top reflux ratio is 5:1, and the tower top temperature The temperature is 78~81°C, the temperature of the tower bottom is 175~180°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. 190~195°C...

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% ethylene glycol and 10wt% [Mpy] [PF 6 ] 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 propyl 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 5:1. At this time, the temperature at the top of the tower is 78~82°C, and the temperature at the bottom of the tower is 178~184°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. 190~200℃. The purity of the propyl acetate obtained at the top of the tower is more th...

Embodiment example 3

[0019] The extraction and rectification twin-tower flow process is the same as in Example 1, and the extractant is selected from 90wt% ethylene glycol, 5wt%[Mpy][PF 6 ], 5wt%[Emim][BF 4 ].

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Abstract

The invention relates to a method for separating ethanol-propyl acetate azeotrope through continuous extractive rectification. The extractive rectification often adopts a double-tower process flow, and comprises an extractive rectifying tower and a solvent recycling tower; in order to realize the production capacity of the extractive rectifying tower, not only a reasonable process flow and a reasonable tower structure are needed, but also a dosage ratio of a raw material to an extractant, a feeding position and many other factors are required. Aiming at an azeotropic system of the ethanol and the propyl acetate, a mixed solution of ethanediol and ionic liquid [Emim][BF4] and [Mpy][PF6] is used as the extractant, and finally the ethanol and the propyl acetate are separated.

Description

technical field [0001] The invention relates to a method for continuous extraction and rectification of mixed solvents to separate ethanol-propyl acetate azeotrope. A mixed liquid composed of ionic liquid and organic solvent is used as an extraction agent to realize rectification and separation of ethanol-propyl acetate azeotrope. Background technique [0002] Ethanol and propyl acetate are important organic solvents and chemical raw materials, but the mixture of the two has azeotropic phenomenon, and ordinary distillation methods cannot be completely separated. Therefore, it is very necessary to realize the separation research of the azeotrope between the two. [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 az...

Claims

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Application Information

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IPC IPC(8): C07C31/08C07C29/84C07C69/14C07C67/54B01D3/40
CPCC07C29/84C07C67/54C07C31/08C07C69/14Y02P20/54
Inventor 姜占坤刘顺江孙国新
Owner UNIV OF JINAN
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