Method for treating high-COD (Chemical Oxygen Demand) components in phenoxyalkanoic acid production wastewater

A technology for phenoxycarboxylic acids and waste water production, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, carboxylate preparation, etc., to reduce costs, solve environmental problems, and have good fluidity.

Active Publication Date: 2013-05-22
SHANDONG WEIFANG RAINBOW CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the present invention provides a method for treating high COD components in phenoxyca...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 4000L of 2,4-D mother liquid water to a 6300L enamel kettle, and the measured indicators are: density 1.27g / mL, pH=8.31; 2,4-D, 2,6-dichlorophenoxyacetic acid, 2 , the contents of 4,6-trichlorophenoxyacetic acid were 0.12%, 0.17%, and 0.04% respectively; the content of glycolic acid was 1.38%; the total phenols were 1.52% (calculated as 2,4-dichlorophenol); the mother liquor The COD of water is 34838mg / L. Add 30% concentrated hydrochloric acid to it at 0°C to adjust the pH ≤ 2, let it stand still, separate 72.4kg of the lower organic phase, and measure 2,4-D, 2,6-dichlorophenoxyacetic acid and The contents of 2,4,6-trichlorophenoxyacetic acid were 0.06%, 0.07%, and 0.01%, respectively, the total phenol was 0.26% (calculated as 2,4-dichlorophenoxyacetic acid), and the content of glycolic acid was 1.35%. Add 254kg of toluene to the upper water phase for extraction, then let it stand for stratification, separate the solvent phase of 273.7 kg, and measure the contents ...

Embodiment 2

[0031] Add 4000L 2,4-D acidified water to a 6300L enamel kettle, and the measured indicators are: density 1.06g / mL, pH=1.19; 2,4-D, 2,6-dichlorophenoxyacetic acid, 2 , The contents of 4,6-trichlorophenoxyacetic acid were 0.11%, 0.06%, and 0.02% respectively; the total phenol was 0.22% (calculated as 2,4-dichlorophenol); the COD of the acidified water was 5034mg / L. Add 282.7kg of tetrachlorethylene to the kettle for extraction, then let it stand for layering, separate the solvent phase of 290.3kg, and measure the content of 2,4-D and 2,6-dichlorophenoxyacetic acid in the water phase after extraction to be 0.002 %, 0.001%, 2,4,6-trichlorophenoxyacetic acid was not detected, the total phenol was 0.002% (based on 2,4-dichlorophenoxyacetic acid), and its COD was measured to be 55mg / L. COD has reached the standard and meets the emission standard. The obtained solvent was added with 50% potassium hydroxide solution to pH ≥ 9, and then the solvent was separated, and the residue was a...

Embodiment 3

[0034] Add 4000L 2,4-D washing water to a 6300L enamel kettle, and the measured indicators are: density 1.02g / mL, pH=2.56; 2,4-D, 2,6-dichlorophenoxyacetic acid, 2 , the contents of 4,6-trichlorophenoxyacetic acid were 0.16%, 0.03%, and 0.007% respectively; the total phenol was 0.16% (calculated as 2,4-dichlorophenol); the COD of the washing water was 4428mg / L. Add 98% concentrated sulfuric acid to the kettle at 20°C to pH ≤ 2, add 408kg of tetrachlorethylene for extraction, and then separate the solvent phase for 422.3kg, and measure 2,4-D, 2 , the content of 6-dichlorophenoxyacetic acid was 0.001%, 0.001% respectively, 2,4,6-trichlorophenoxyacetic acid was not detected, and the total phenol was 0.001% (based on 2,4-dichlorophenoxyacetic acid ), the measured COD is 21.9mg / L, the COD of the water has reached the standard and meets the discharge standard. The obtained solvent was added with 50% sodium hydroxide solution to pH ≥ 9, and then the solvent was separated. The residu...

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Abstract

The invention discloses a method for treating high-COD (Chemical Oxygen Demand) components in phenoxyalkanoic acid production wastewater. The method comprises the following steps: separating the high-COD components from the phenoxyalkanoic acid production wastewater; carrying out esterification reaction on the high-COD components and the alcohol, so as to obtain the ester product. According to the method, the wastewater generated in the production process of phenoxyalkanoic acid products is simply treated by extracting and separating and the like in order to separate the high-COD components such as phenoxy carboxylic acid and creosote from the wastewater, and then the way of generating the esters is carried out on the high-COD components; the produced ester product is high in mobility and free from crystallizing at normal temperature, and can be used as the fuel for combusting, and the heat of combustion is about 4800 to 5000 kilocalories per kilograms, and therefore, the problems that in the prior art, the high-COD components separated from the wastewater cannot be treated and bring high pollution to the environment can be solved, a certain economic efficiency is brought, and the cost of treating the wastewater is decreased.

Description

technical field [0001] The invention relates to a method for treating high COD components in phenoxycarboxylic acid production wastewater, and belongs to the technical field of wastewater treatment. Background technique [0002] Phenoxycarboxylic acid products are hormone-type systemic plant protection products, which have strong physiological activity on plants, promote plant growth at low concentrations, and inhibit the growth of dicotyledonous plants at high concentrations. Plants appear deformed and die. Because of its excellent characteristics of high efficiency, low toxicity, low residue, and no pollution to the environment, phenoxycarboxylic acids are widely used in plant protection. [0003] Phenoxycarboxylic acid plant protection products mainly include 2,4-D (2,4-dichlorophenoxyacetic acid), 2,4-DP (2-(2,4-dichlorophenoxy)-propionic acid), 2,4-DB (2,4-dichlorophenoxybutyric acid), MCPA (2-methyl-4 chlorophenoxyacetic acid), MCPP (2-(2-methyl-4 chlorophenoxy)-prop...

Claims

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Application Information

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IPC IPC(8): C02F9/04C07C67/08C07C69/712
Inventor 孙国庆侯永生张利国李志清刘强韩明磊唐丽莉王永申王友信田茂英吴清尧杨礼允吴秀改石金娜李丽王建霞赵倩倩谢亚姣胡立圆李建国
Owner SHANDONG WEIFANG RAINBOW CHEM
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