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Technology for separating ethyl alcohol-water system by means of extractive distillation and flash coupling

A technology of extractive distillation and extractive distillation tower, which is applied in the field of chemical separation and purification, can solve the problems of affecting product quality, high cost of separation process, complicated process flow, etc., and achieves the reduction of solvent ratio, less addition amount, and increase of relative volatility Effect

Active Publication Date: 2017-02-22
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defects and deficiencies in the above-mentioned existing separation technology are: the influence of properties such as the viscosity and thermal stability of the ionic liquid on the production process is ignored; the cost of the separation process is relatively high; and the product quality is affected to a certain extent; the process complicated process
[0008] The development of green and high-efficiency separation technology for ethanol-water mixtures is of great significance. In the articles and patents related to the separation of ethanol-water mixtures, there is no published ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate and 1 -Ethyl-3-methylimidazolium dicyanamide salt is used as an extractant to conduct extractive distillation and flash evaporation coupled separation of ethanol-water system

Method used

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  • Technology for separating ethyl alcohol-water system by means of extractive distillation and flash coupling

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Example 1: The inner diameter of the extractive distillation tower is Φ500mm, the number of theoretical plates is 40, the operating pressure is 101.325kPa, the operating reflux ratio is 1.8, the temperature at the top of the tower is controlled at 77°C, the temperature at the bottom of the tower is 95°C, and the ions at 25°C The liquid 1-ethyl-3-methylimidazolium tetrafluoroborate enters from the sixth plate, and the mass fraction of 25°C is 20% ethanol-80% water mixture enters from the 34th plate at a flow rate of 1000kg / h. The mass ratio of the ionic liquid to ethanol-water is controlled to be 1:3, and the steam rising from the top of the tower is condensed by the condenser. The reflux liquid is refluxed from the top of the extractive distillation tower, and the production liquid is ethanol with a mass fraction of 99.5%. The tower kettle of the extractive distillation tower is a mixture of 1-ethyl-3-methylimidazolium tetrafluoroborate and water. The reflux liquid is r...

Embodiment 2

[0024] Example 2: The inner diameter of the extractive distillation tower is Φ400mm, the number of theoretical plates is 35, the operating pressure is 101.325kPa, the operating reflux ratio is 2.1, the temperature at the top of the tower is controlled at 77.8°C, the temperature at the bottom of the tower is 109°C, and the ions at 25°C The liquid 1-ethyl-3-methylimidazolium tetrafluoroborate enters from the 6th plate, and the mass fraction of 25°C is 30% ethanol-70% water mixture enters from the 29th plate with a flow rate of 1000kg / h. The mass ratio of ionic liquid to ethanol-water is controlled to be 1:2.5, and the steam rising from the tower top is condensed by the condenser. The reflux liquid is refluxed from the top of the extractive distillation tower, and the production liquid is ethanol with a mass fraction of 99.6%. The tower kettle of the extractive distillation tower is a mixture of 1-ethyl-3-methylimidazolium tetrafluoroborate and water. The reflux liquid is reboile...

Embodiment 3

[0025] Example 3: The inner diameter of the extractive distillation tower is Φ400mm, the number of theoretical plates is 35, the operating pressure is 101.325kPa, the operating reflux ratio is 2.6, the temperature at the top of the tower is controlled at 77.8°C, the temperature at the bottom of the tower is 107°C, and the ions at 25°C The liquid 1-ethyl-3-methylimidazolium tetrafluoroborate enters from the 6th plate, and the mass fraction of 25°C is 40% ethanol-60% water mixture enters from the 30th plate with a flow rate of 1000kg / h. The mass ratio of the ionic liquid to ethanol-water is controlled to be 1:2, and the steam rising from the top of the tower is condensed by the condenser. The reflux liquid is refluxed from the top of the extractive distillation tower, and the production liquid is ethanol with a mass fraction of 99.6%. The tower kettle of the extractive distillation tower is a mixture of 1-ethyl-3-methylimidazolium tetrafluoroborate and water, the reflux liquid i...

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Abstract

The invention discloses a technology for separating an ethyl alcohol-water system by means of extractive distillation and flash coupling. The technology comprises the steps that ionic liquid is adopted as an extracting agent, the relative volatility of ethyl alcohol for water can be improved, and the separating efficiency can be improved to obtain an ethyl alcohol product, wherein the ionic liquid is 1-ethyl-3-methylimidazolium tetrafluoroborate and 1-ethyl-3-methylimidazolium dicyanamide. The adopted ionic liquid extracting agent can improve the relative volatility of ethyl alcohol in the ethyl alcohol-water system, and the solvent ratio is decreased. The ethyl alcohol with the purity larger than 99.9% is obtained. According to the technological process for separating ethyl alcohol-water by means of extractive distillation and flash coupling, the stable and continuous ionic liquid can be recycled.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of separation and purification of chemical industry, and in particular relates to a process for separating ethanol-water system by extractive distillation and flash distillation. [0003] 【Background technique】 [0004] In the chemical and pharmaceutical industries, ethanol is an important solvent and raw material, and the demand continues to increase. Recycling high-purity ethanol in industrial production is of great economic significance to enterprises. Since ethanol and water will form an azeotrope with an azeotropic temperature of 78.15°C, it is difficult to effectively separate them by ordinary distillation methods. In recent years, due to the excellent properties of ionic liquids such as extremely low vapor pressure, low melting point, thermal stability, non-toxicity, non-corrosiveness, and designability, the research and development of extractive distillation using ionic liquids as extraction agents ha...

Claims

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Application Information

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IPC IPC(8): C07C29/76C07C29/80C07C29/84C07C31/08
CPCC07C29/76C07C29/80C07C29/84C07C31/08Y02P20/54
Inventor 朱兆友李英生贾慧刘薇王英龙
Owner QINGDAO UNIV OF SCI & TECH
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