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Separation method for acetic acid and water

A separation method, the technology of acetic acid, is applied in the field of chemical engineering to achieve the effect of improving extraction and separation, reducing solubility and reducing loss

Inactive Publication Date: 2017-12-12
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still contradictions in this method between the selectivity of the extractant and the water-carrying capacity of the entrainer, the sparse distribution and the limit concentration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dilute acetic acid with a mass concentration of 30% and CH 3 COOK mix, CH 3 The mass of COOK is 5% of the mass of dilute acetic acid solution. The dilute acetic acid solution containing salt is introduced into the extraction tower from the lower part, and the n-propyl acetate is introduced into the extraction tower from the upper part. twice the amount. The extraction phase flows out from the top of the extraction tower, and the content of acetic acid in the extraction phase is 75.2% (without extractant). The extraction phase and an appropriate amount of water are introduced into the azeotropic rectification tower, the amount of water is 40% (mass) of the extraction dose, the number of theoretical plates of the azeotropic rectification tower is 25, the reflux ratio is 4, and the reboiler temperature of the tower still is 118°C, the feed is on the 12th tray, and the azeotrope of n-butyl acetate and water is extracted from the top of the tower. After condensation and s...

Embodiment 2

[0021] Dilute acetic acid with a mass concentration of 30% and CH 3 COOK mix, CH 3 The mass of COOK is 5% of the mass of dilute acetic acid solution. The dilute acetic acid solution containing salt is introduced into the extraction tower from the lower part, and the n-propyl acetate is introduced into the extraction tower from the upper part. twice the amount. The extraction phase flows out from the top of the extraction tower, and the content of acetic acid in the extraction phase is 75.2% (without extractant). The extraction phase and an appropriate amount of water are introduced into the azeotropic rectification tower, the amount of water is 30% (mass) of the extraction dose, the number of theoretical plates of the azeotropic rectification tower is 25, the reflux ratio is 4, and the reboiler temperature of the tower still is 118°C, the feed is on the 12th tray, and the azeotrope of n-butyl acetate and water is extracted from the top of the tower. After condensation and s...

Embodiment 3

[0023] Dilute acetic acid with a mass concentration of 30% and CH 3 COOK mix, CH 3 The mass of COOK is 10% of the mass of dilute acetic acid solution. The dilute acetic acid solution containing salt is introduced into the extraction tower from the lower part, and the n-butyl acetate is introduced into the extraction tower from the upper part. twice the amount. The extraction phase flows out from the top of the extraction tower, and the content of acetic acid in the extraction phase is 77.2% (without extractant). The extraction phase and an appropriate amount of water are introduced into the azeotropic rectification tower, the amount of water is 40% (mass) of the extraction dose, the number of theoretical plates of the azeotropic rectification tower is 25, the reflux ratio is 4, and the reboiler temperature of the tower still is 118°C, the feed is on the 12th tray, and the azeotrope of n-butyl acetate and water is extracted from the top of the tower. After condensation and s...

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Abstract

The invention discloses a separation method for acetic acid and water, belonging to the field of chemical engineering. According to a technical scheme of the invention, the separation method comprises the following steps: adding soluble salt into a diluted acetic acid solution, then introducing the salt-containing diluted acetic acid solution and an extracting agent into an extraction tower, carrying out countercurrent extraction, and allowing an extraction phase to outflow from the top of the tower and a raffinate phase to outflow from the bottom of the tower; and introducing the extraction phase and water into an azeotropic distillation tower, and allowing the extracting agent and the water to outflow from the top of the distillation tower and the acetic acid to outflow from the bottom of the distillation tower. The method provided by the invention has simple process and easy operation, can extract acetic acid with a concentration of 95% or above from diluted acetic acid, can improve the separation effect of the extracting agent by adopting salt-adding extraction and concentration of the diluted acetic acid, reduces the loss of the extracting agent, and can effectively separate the extracting agent from the acetic acid by adopting an azeotropic distillation process.

Description

technical field [0001] The invention belongs to the field of chemical engineering, in particular to a production process for obtaining acetic acid from dilute acetic acid solution. Background technique [0002] Acetic acid is an important solvent in industrial production. During use, the concentration of acetic acid is gradually reduced from above 95% to below 40%. It is necessary to separate acetic acid from water to increase the concentration of acetic acid to above 95%, so as to reuse acetic acid. The methods for separating acetic acid and water in industry mainly adopt common rectification, azeotropic rectification, extraction and rectification combined method. Since the non-ideal behavior of the acetic acid-water system is very obvious, as the water content increases, the relative volatility of acetic acid-water tends to 1. Therefore, in order to achieve the final separation effect, ordinary rectification requires a higher reflux ratio and more Tray, higher energy cons...

Claims

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Application Information

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IPC IPC(8): C07C51/46C07C51/48C07C53/08
CPCC07C51/46C07C51/48C07C53/08
Inventor 汪洋袁浩胡维强刘宗健
Owner SINOPEC YANGZI PETROCHEM
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