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Method for reclaiming acetic acid from waste water containing dilute acetic acid

A recovery method and technology of dilute acetic acid, applied in separation methods, separation/purification of carboxylic acid compounds, adsorption water/sewage treatment, etc., can solve the problems of unsatisfactory effect, uneconomical, low recovery rate, etc., and achieve high recovery rate , the effect of reducing pollution and low investment

Active Publication Date: 2010-07-14
SINOPEC YIZHENG CHEM FIBER
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Problems solved by technology

Rectification is generally applicable to the recovery of high-concentration acetic acid. For low-concentration acetic acid solutions, it is uneconomical to adopt rectification; solvent extraction and esterification are unsatisfactory for the recovery of low-concentration acetic acid, and the recovery rate is low. Low

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  • Method for reclaiming acetic acid from waste water containing dilute acetic acid
  • Method for reclaiming acetic acid from waste water containing dilute acetic acid

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Embodiment Construction

[0015] The invention combines the electrodialysis method and the resin adsorption method, and first uses the electrodialysis method to reduce the acetic acid content in the waste water, and then uses the anion resin adsorption method to further remove the remaining acetic acid, so that the recovery rate of the acetic acid is increased and the power consumption is greatly reduced.

[0016] Specifically, the weight percentage of acetic acid in wastewater containing dilute acetic acid is generally not more than 5%. The present invention uses electrodialysis to treat and recycle the acetic acid in this type of wastewater to reduce the concentration of acetic acid to below 1000ppm, and then use anion The resin adsorption method further removes the remaining acetic acid, which can reduce the concentration of acetic acid in the final discharged wastewater to below 50ppm.

[0017] According to the technical scheme of the present invention, the liquids on the diluting side and concentra...

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Abstract

The invention relates to a method for recovering acetic acid from dilute acetic acid containing waste water and belongs to the technical field of chemical production. The invention is characterized in that electrodialysis is firstly used for treatment and reclamation of dilute acetic acid containing waste water to get an extremely dilute acetic acid solution with a concentration lower than 1,000ppm, and then anion exchange resin adsorption is employed to further remove and recover residual acetic acid in the extremely dilute solution so that the concentration of acetic acid in the finally discharged waste water is lower than 50ppm. The method combines electrodialysis and desorption, overcoming not only the shortcoming of high power consumption during electrodialysis due to low conductivity of the extremely dilute acetic acid solution but also the defect of huge equipment volume because of low resin adsorption capacity in the process of adsorption. The method has the advantages of low investment, low energy consumption, high recovery, etc., and can fully recover usable resources in waste water and reduce pollution of waste water to the environment.

Description

technical field [0001] The invention relates to the recovery of dilute acetic acid and belongs to the technical field of chemical production. Background technique [0002] Acetic acid is an important chemical raw material, widely used in chemical industry, light textile, medicine, dyestuff and other industrial fields. A considerable amount of acetic acid consumed or generated in industrial production is discharged with wastewater. For example, a small amount of acetic acid is discharged from tower top wastewater in the process of acetic acid rectification and dehydration. In the production of furfural, the annual acetic acid discharged with wastewater in the country is about There are about 10,000 tons. This not only loses a lot of useful resources, but also pollutes the environment. Therefore, recovering acetic acid from dilute acetic acid aqueous solution not only has significant economic benefits, but also has significant environmental benefits. [0003] The methods of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/08C07C51/42C07C51/47C02F1/469C02F1/28
Inventor 陈达魏家瑞吴燕翔吴华志邱挺
Owner SINOPEC YIZHENG CHEM FIBER
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