Method for separating ethanol-propyl formate azeotrope by continuous extractive rectification

A technology of extractive distillation and propyl formate, which is applied in the field of continuous extraction and distillation to separate ethanol-propyl formate azeotrope, which can solve the problems of incomplete separation and achieve the advantages of equipment protection and project investment

Inactive Publication Date: 2015-05-20
UNIV OF JINAN
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Problems solved by technology

[0002] Ethanol and propyl formate 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 of the azeotrope between the two

Method used

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  • Method for separating ethanol-propyl formate azeotrope by continuous extractive rectification

Examples

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Effect test

Embodiment example 1

[0015] (1) A method for continuous extraction and rectification to separate ethanol-propyl formate azeotrope, 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 formate is added from the 42nd theoretical plate, the flow rate is 100kg / hr, the mass fraction of ethanol is 40%, B1 is operated under normal pressure, the top reflux ratio is 7:1, and the top temperature The temperature is 75~80°C, the temperature of the tower bottom is 120~130°C, the top product is analyzed by gas chromatography, and the propyl formate product with a purity higher than 99% is obtained. (2) The bottom of the extractive distillation tower B1 enters the solvent recovery tower B2. The solvent recovery tower has 50 theoretical plates. The operating conditions ...

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% [Bmim] [BF 4 ] Do mixed extractant, B1 theoretical plate number is 70, feeds from the 3rd theoretical plate, flow rate is 300kg / hr. The mixture of ethanol and propyl formate is added from the 55th 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 75-80°C, and the temperature at the bottom of the tower is 120-125°C. The overhead product is analyzed by gas chromatography to obtain a propyl formate product with a purity higher than 99%. (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. ~200°C. The purity of the ethanol obtained at the top of the tower is over 9...

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% ethylene glycol, 5wt% [Bmim] [BF 4 ], 5wt% [Emim][BF 4 ] mixture.

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Abstract

The invention relates to a method for separating an ethanol-propyl formate azeotrope by continuous extractive rectification. The extractive rectification usually adopts a double-tower process which is composed of an extractive rectification tower and a solvent recovery tower. The productivity of the extractive rectification tower needs the reasonable technical process and tower structure, and has requirements for raw material/extractant ratio, feed position and many other factors. Aiming at the ethanol-propyl formate azeotropic system, the method adopts a ethylene glycol and a mixed solution of ionic liquids ([Emim][BF4] and [Bmim][BF4]) as extractants to finally separate the ethanol and propyl formate.

Description

technical field [0001] The invention relates to a method for continuously extracting and rectifying the separation of ethanol-propyl formate azeotrope. The mixed liquid composed of ionic liquid and organic solvent is used as an extraction agent to realize the rectification and separation of ethanol-propyl formate azeotrope. Background technique [0002] Ethanol and propyl formate 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 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 azeotropic componen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C27/32C07C29/84C07C31/08C07C67/54C07C69/06
CPCC07C67/54C07C29/84C07C69/06C07C31/08
Inventor 姜占坤刘顺江孙国新
Owner UNIV OF JINAN
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