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Isopropyl ether-isopropyl alcohol azeotrope distillation separation method based on choline chloride deep eutectic solvent

A technology of deep eutectic solvent and choline chloride, which is applied in ether separation/purification, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve problems that have not been seen, and achieve low equipment investment, flexible operation, and no waste The effect of pollution

Inactive Publication Date: 2015-08-26
UNIV OF JINAN
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Problems solved by technology

According to literature research, there is no literature report on the use of DES for the separation of isopropyl ether-isopropanol azeotrope

Method used

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  • Isopropyl ether-isopropyl alcohol azeotrope distillation separation method based on choline chloride deep eutectic solvent

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Embodiment 1

[0012] Embodiment 1: adopt batch extraction rectification device, drop into 500 L isopropyl ether-isopropanol azeotropic mixture (wherein isopropyl ether 80%, isopropanol 20%, are mass percent) in heating kettle, extraction agent is Choline chloride and ethylene glycol deep eutectic solvent, its composition molar ratio is 1:2, turn on the heat source of heating kettle and the cold source of condenser, wait for a period of time after the top reflux of extraction and rectification column, the temperature of the top of the column is stable, add extraction The feed position of the extractant is close to the top of the tower, the speed of adding the extractant is controlled to 300 L / h, and the total reflux operation is performed. When the temperature of the top of the extractive distillation tower is 68-69°C, the content of isopropyl ether in the distillate is ≥ 99% start to discharge, the reflux ratio is 3:1, and the discharge speed is 200 L / h. When the temperature at the top of t...

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Abstract

The invention relates to an isopropyl ether-isopropyl alcohol azeotrope distillation separation method based on a choline chloride deep eutectic solvent, and belongs to a separation technology of an isopropyl ether-isopropyl alcohol azeotropic mixture. According to the method, an extraction agent is a choline chloride and ethylene glycol low eutectic solvent, and a molar ratio of choline chloride to ethylene glycol is 1:2, operating conditions of an extractive distillation tower are as follows: a mass ratio of the extraction agent to an overhead product is (1:1)-(3:1), different temperatures and different reflux ratios of the extractive distillation tower top are controlled, and isopropyl ether, an isopropyl ether-isopropyl alcohol transition segment I and an isopropyl alcohol and an isopropyl alcohol-extraction agent transition segment II are extracted from the extractive distillation tower top respectively; when extraction agent composition of a tower pot meets the requirement, the extraction agent is pumped into a high-position storage tank for recycling. The method has the advantages as follows: the novel extraction agent is adopted to damage the isopropyl ether-isopropyl alcohol azeotropic system, so that high-purity isopropyl ether and isopropyl alcohol products are separated out; single-tower operation is adopted, thus, the operation is flexible, and the equipment cost is low; the extraction agent is recycled, and accordingly, waste pollution is prevented.

Description

technical field [0001] The invention relates to a method for intermittent extraction and rectification of isopropyl ether-isopropanol azeotrope mixture using choline chloride deep eutectic solvent as an extractant, which belongs to the separation technology of isopropyl ether-isopropanol azeotrope mixture. Background technique [0002] Isopropyl ether, also known as diisopropyl ether, has a boiling point of 68.5 °C. It is insoluble in water, but soluble in most organic solvents such as alcohol, ether, benzene, and chloroform. At the same time, isopropyl ether itself is also a good organic solvent. Diisopropyl ether is often used in industry. Isopropyl ether mixed with other solvents is used in the dewaxing process of paraffin-based oils. As a solvent, it is also used in pharmaceuticals, smokeless gunpowder, paint and paint cleaning, etc. Diisopropyl ether has high octane number and antifreeze performance, and can be used as a gasoline admixture. Isopropanol has a boiling po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/10C07C29/84C07C43/04C07C41/42
CPCC07C41/42C07C29/84C07C43/04C07C31/10
Inventor 姜占坤刘顺江孙国新
Owner UNIV OF JINAN
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