Process and equipment for purifying dilute acetic acid solution

A technology of solution purification and dilute acetic acid, applied in the field of purification technology, can solve problems such as unsatisfactory treatment effect and secondary pollution, and achieve the effects of shortening the solvent recovery process, reducing steam consumption and reducing secondary pollution

Inactive Publication Date: 2012-05-02
ANQIU LUAN PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the extraction and rectification method has a good effect on the treatment of acetic acid solutions with a mass fraction between 10% and 50%, but it is not ideal for low-concentration acetic acid solutions (<10%).
[0006] For acetic acid solutions with a concentration lower than 5%, the extraction method is usually used, especially the complex extraction method, but the extractant will be partially dissolved in the aqueous solution, which is likely to cause secondary pollution

Method used

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  • Process and equipment for purifying dilute acetic acid solution

Examples

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Embodiment 1

[0025] A kind of dilute acetic acid solution purification technique, described dilute acetic acid solution is the acetic acid solution that massfraction is 6%, and described technique comprises the following steps:

[0026] (1) Extraction: Dilute acetic acid solution enters the upper part of the extraction tower, and the organic phase isopropyl acetate from the decanter enters the lower part of the extraction tower as an extraction agent. In the extraction tower, the extraction agent extracts the acetic acid in the dilute acetic acid solution to in the extraction phase;

[0027] (2) Phase separation: After extraction, the raffinate phase water contains a small amount of isopropyl acetate, which is pumped into the stripping tower; the extract phase containing a small amount of water is pumped into the azeotropic distillation tower; The top temperature is controlled at 98°C, the temperature of the tower is controlled at 100°C and normal pressure, the water obtained from the towe...

Embodiment 2

[0033] A kind of dilute acetic acid solution purification technique, described dilute acetic acid solution is the acetic acid solution that massfraction is 5%, and described technique comprises the following steps:

[0034] (1) Extraction: Dilute acetic acid solution enters the upper part of the extraction tower, and the organic phase isopropyl acetate from the decanter enters the lower part of the extraction tower as an extraction agent. In the extraction tower, the extraction agent extracts the acetic acid in the dilute acetic acid solution to in the extraction phase;

[0035] (2) Phase separation: After extraction, the raffinate phase water contains a small amount of isopropyl acetate, which is pumped into the stripping tower; the extract phase containing a small amount of water is pumped into the azeotropic distillation tower; The top temperature is controlled at 98.6°C, the tower temperature is controlled at 100.3°C and normal pressure, the water obtained from the tower i...

Embodiment 3

[0041] A kind of dilute acetic acid solution purification technique, described dilute acetic acid solution is the acetic acid solution that massfraction is 4%, and described technique comprises the following steps:

[0042] (1) Extraction: The dilute acetic acid solution enters the upper part of the extraction tower, and the organic phase isopropyl acetate from the decanter enters the lower part of the extraction tower as an extraction agent. In the extraction tower, the extraction agent extracts the acetic acid in the dilute acetic acid solution to in the extraction phase;

[0043](2) Phase separation: After extraction, the raffinate phase water contains a small amount of isopropyl acetate, which is pumped into the stripping tower; the extract phase containing a small amount of water is pumped into the azeotropic distillation tower; The top temperature is controlled at 99°C, the tower temperature is controlled at 100.5°C and normal pressure, the water obtained from the tower ...

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Abstract

The invention discloses a process and equipment for purifying a dilute acetic acid solution. The process comprises the following steps of: extraction, phase splitting, azeotropic distillation, vapor condensation and separation, extracting agent recovery, and the like. The equipment comprises an extraction tower, an azeotropic distillation tower, a stripping tower, a heat exchanger, an acid storage tank, a decanter and a wastewater tank. The invention has the advantages that: the dilute acetic acid solution is concentrated by an extraction process, and the concentrated solution is purified by an azeotropic distillation method, so that steam consumption is reduced, the solvent recovery process is shortened, and the consumption and secondary pollution of a solvent are reduced; and the concentration of acetic acid after separation is more than or equal to 99.0 percent, the concentration of the acetic acid in the discharged water is less than 0.2 percent, the recovery rate of the acetic acid is more than or equal to 95 percent, the consumption of an extracting agent is less than or equal to 0.15 percent, and the steam consumption is less than or equal to 4t/h.

Description

technical field [0001] The present invention relates to a purification process, in particular to a dilute acetic acid solution purification process and equipment, in particular to a process and equipment for purifying dilute acetic acid solution with a mass fraction of about 5% to over 99%, which belongs to the field of acetic acid purification . Background technique [0002] Paracetamol tablets are obtained by acetylation of p-aminophenol. During the production process, by-products will be obtained—dilute acetic acid solution with a mass fraction of about 5%, and the rest is water. The usual treatment method for this by-product is to flow into the sewer, underground or enter the urban sewage treatment plant. However, these methods will cause environmental pollution. Entering the urban sewage treatment plant will cause too high COD and are difficult to biodegrade. If it is used in industrial production again, the acetic acid content is too low, and the transportation cost i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/08C07C51/48C07C51/46
Inventor 栾汝兴李敏李庆文
Owner ANQIU LUAN PHARMA
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