Method for ionic liquid extractive rectification and removal of acid and water simultaneously

A technology of ionic liquid and extractive distillation, which is applied in the field of separation and purification, can solve the problems of easily damaged deacidification and dehydration medium, low production capacity, complicated equipment, etc., to avoid high energy consumption and environmental pollution, reduce industrial costs, and simple equipment Effect

Inactive Publication Date: 2017-12-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there are the following problems: due to the water solubility of the acid, the acid carried in the crude ester enters the water layer when the crude ester is dehydrated, causing an increase in the consumption of raw material acid; It will also be lost with the water layer of the phase separator, resulting in acid loss; multiple rectification towers consume a lot of steam, increasing energy consumption; the entire process is complex and costly; a large amount of waste water is generated during alkali washing and water washing, causing environmental pollution
In addition, there are many other deacidification and dehydration metho...

Method used

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  • Method for ionic liquid extractive rectification and removal of acid and water simultaneously

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Experimental program
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Effect test

Embodiment 1

[0015] Such as figure 1 The extractive distillation process shown. The operating conditions of the extractive distillation tower are: temperature 25°C, pressure 1atm, theoretical tower number 20, reflux ratio 2, tower top reflux flow 895kg / h, a stream of industrial materials (water, ethanol, acetic acid, Ethyl acetate mass fraction is respectively 1%, 32%, 5%, 62%) is fed from the middle part of rectification column, mass flow is controlled at 1000kg / h, ionic liquid [EMIM] + [BF 4 ] - (1-ethyl-3-methylimidazolium tetrafluoroboric acid) is added from the top of the extractive distillation tower as an extractant, and the mass flow rate is 800kg / h. At this time, the water content of the tower top material is 334ppm, and the acetic acid content is 203ppm. The ionic liquid extractive distillation technology can significantly remove water and acid in the material at the same time. The ionic liquid rich in water and acetic acid at the bottom of the rectification tower enters the f...

Embodiment 2

[0023] The extractive distillation process is shown in the figure. The operating conditions of the extractive distillation tower are: temperature 25°C, pressure 1atm, theoretical tower number 20, reflux ratio 2, tower top reflux flow 895kg / h, a stream of industrial materials (water, ethanol, acetic acid, Ethyl acetate mass fraction is respectively 1%, 32%, 5%, 62%) is fed from the middle part of rectification column, mass flow is controlled at 1000kg / h, ionic liquid [EMIM] + [BF 4 ] - (1-ethyl-3-methylimidazolium tetrafluoroboric acid) is added from the top of the extractive distillation tower as an extractant, and the mass flow rate is 800kg / h. At this time, the water content of the tower top material is 642ppm, and the acetic acid content is 514ppm. The ionic liquid extractive distillation technology can significantly remove water and acid in the material at the same time. The ionic liquid rich in water and acetic acid at the bottom of the rectification tower enters the fl...

Embodiment 3

[0029]The extractive distillation process is shown in the figure. The operating conditions of the extractive distillation tower are: temperature 25°C, pressure 1atm, theoretical tower number 20, reflux ratio 2, tower top reflux flow 895kg / h, a stream of industrial materials (water, ethanol, acetic acid, Ethyl acetate mass fraction is respectively 1%, 32%, 5%, 62%) is fed from the middle part of rectification column, mass flow is controlled at 1000kg / h, ionic liquid [EMIM] + [Tf 2 N] - (1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide) is added from the top of the extractive distillation tower as an extractant, and the mass flow rate is 800kg / h. At this time, the water content of the tower top material was 548ppm, and the acetic acid content It was 162ppm, indicating that the use of ionic liquid extractive distillation technology can significantly remove water and acid in the material at the same time. The ionic liquid rich in water and acetic acid at the bottom of th...

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Abstract

Belonging to the technical field of separation and purification, the invention relates to a method for ionic liquid extractive rectification and removal of acid and water simultaneously. The method includes the step of: sending an industrial material containing certain acid and water into an extractive rectification tower through a pipeline, and the operation conditions of the rectification tower include: a temperature of 20-100DEG C, a pressure of 1-5atm, a number of theoretical plates of 10-40, and a solvent ratio of 0.5-5. The industrial material has a water content of 0.1%-5% (mass fraction, the same below), an acid content of 0.1%-5%, a tower top material water content of less than 2000ppm, and an acid content of less than 2000ppm. The operation conditions of high temperature flash tank are: a temperature of 100-200DEG C and a pressure of 0.01-0.9atm, and the ionic liquid extracted from the bottom of the flash tank can be recycled. When the ionic liquid is employed for extractive rectification and removal of acid and water simultaneously, the acid content and water content of the final material can both reach the ppm level, and the acid in the material can be recovered through the flash tank.

Description

technical field [0001] The invention relates to a method for simultaneous deacidification and dehydration by ionic liquid extraction and rectification. The extractant can be a single ionic liquid or a mixed solution of two ionic liquids. The cations of the ionic liquids can be imidazoles, pyridines, quaternary ammonium salts, etc., and the anions can be bistrifluoromethanesulfonimide, tetrafluoroborate, Hexafluorophosphate, acetate, diethyl sulfate, etc. It belongs to the technical field of separation and purification. Background technique [0002] In industrial production, materials containing acid and water are often produced, which must be deacidified and dehydrated to prevent corrosion and blockage of pipes and equipment by acidic materials. In addition, when the acid in the material is used as a reactant in the system, it needs to be recovered and returned to the reaction system for further conversion. Taking various ester compounds as an example, in the production p...

Claims

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Application Information

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IPC IPC(8): C07C67/54C07C69/06C07C69/14
CPCC07C67/54C07C69/14C07C69/06Y02P20/54
Inventor 雷志刚隋晓慧代成娜
Owner BEIJING UNIV OF CHEM TECH
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