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Comprehensive treatment method for 1,4-dihydroxy anthraquinone production wastewater

A dihydroxyanthraquinone, comprehensive treatment technology, applied in natural water treatment, chemical instruments and methods, heating water/sewage treatment, etc. High problems, to achieve the effect of low cost, no solvent entrainment, and high partition coefficient

Active Publication Date: 2016-01-27
BLUESTAR LEHIGH ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the method of resin adsorption, phthalic acid in wastewater can be recycled, but the concentration of pollutants in wastewater is high, the resin adsorption saturation time is short, the resin is fragile, and regeneration is difficult; Concentration of sodium sulfate is not separated, can not meet the discharge or reuse requirements

Method used

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  • Comprehensive treatment method for 1,4-dihydroxy anthraquinone production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, with reference to figure 1 , a comprehensive treatment method for 1,4-dihydroxyanthraquinone production wastewater, the steps are as follows:

[0023] (1) Extraction: Adjust the pH value of 1,4-dihydroxyanthraquinone production wastewater to 0.7 with an inorganic base and filter to remove mechanical impurities. Under normal temperature and pressure, fully mix with the extractant at a ratio of 1:1 to oil and water for 5 minutes. The raffinate phase after stratification is sent to the evaporation process after extraction, and the extraction phase is loaded with extractant and sent to the stripping process for regeneration;

[0024] (2) Stripping: take the above extraction phase and mix it with alkali solution at 40°C for 20 minutes under normal pressure. ; The regenerated extractant is recycled for the extraction process;

[0025] (3) Acidification: Stir the above stripping solution and add inorganic acid, adjust the pH value of the material to 0.7, filter...

Embodiment 2

[0027] Embodiment 2, with reference to figure 1 , a comprehensive treatment method for 1,4-dihydroxyanthraquinone production wastewater, the steps are as follows:

[0028] (1) Extraction: adjust the pH value of the 1,4-dihydroxyanthraquinone production wastewater to 1.5 with an inorganic base and filter to remove mechanical impurities. Under normal temperature and pressure, fully mix with the extractant at a ratio of 5:1 to oil and water for 3 minutes. The raffinate phase after stratification is sent to the evaporation process after extraction, and the extraction phase is loaded with extractant and sent to the stripping process for regeneration;

[0029] (2) Stripping: take the above extraction phase and mix it with alkali solution at 80°C for 10 minutes under normal pressure. ; The regenerated extractant is recycled for the extraction process;

[0030] (3) Acidification: Stir the above stripping liquid and add inorganic acid, adjust the pH value of the material to 1.5, filt...

Embodiment 3

[0032] Embodiment 3, with reference to figure 1 , a comprehensive treatment method for 1,4-dihydroxyanthraquinone production wastewater, the steps are as follows:

[0033] (1) Extraction: Adjust the pH value of 1,4-dihydroxyanthraquinone production wastewater to 1.20 with an inorganic base and filter it. Under normal temperature and pressure, it is fully mixed with the extraction agent at a ratio of 3:1 to oil and water for 4 minutes. The raffinate phase means that the water after extraction is sent to the evaporation process, and the extraction phase is the loaded extractant and sent to the stripping process for regeneration;

[0034] (2) Stripping: Take the above extraction phase and mix it with lye at 65°C for 15 minutes under normal pressure. The amount of alkali added for stripping is based on controlling the pH end point value at 9.0. After stratification, the stripping solution is sent to the acidification recovery system; The regenerated extractant is recycled for the...

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Abstract

The invention provides a comprehensive treatment method for 1,4-dihydroxy anthraquinone production wastewater. The method comprises the steps of extraction, back extraction, acidification, evaporation and the like. After the pH value of the 1,4-dihydroxy anthraquinone production wastewater is regulated with alkali and filtration treatment is performed, acidic substances in the wastewater are complexly extracted, back extraction is performed with alkali liquor on a load extraction agent, the extraction agent is recycled after being regenerated, strip liquor is acidized and filtered to recycle phthalic acid, and filtrated stock returns to an extraction system; raffinate is transferred into an with alkali liquor system and processed through evaporation separating to obtain a sodium sulfate by-product, and evaporation condensate water is processed through oxidation treatment to be drained or recycled after reaching the standard. According to the method, not only is the 1,4-dihydroxy anthraquinone production wastewater treated, but also resource utilization and comprehensive treatment of the wastewater are achieved.

Description

technical field [0001] The invention relates to a method for treating waste water from chemical product production. Specifically, it uses a complex extraction method to recycle phthalic acid in 1,4-dihydroxyanthraquinone production waste water and comprehensively treat the waste water. Background technique [0002] 1,4-Dihydroxyanthraquinone is an important intermediate in organic synthesis, which itself is disperse brown GL. Used in the manufacture of disperse blue SR, disperse blue B, disperse dark blue RB, acid anthraquinone blue R, weak acid brilliant blue RAN, weak acid green GS, reduced gray BG, reduced brown BR, and for the production of intermediate l, 4-diamino Anthraquinone. At present, the domestic industrial production generally adopts the synthesis route of hydroquinone or p-chlorophenol as raw materials. To produce 1 ton of 1,4-dihydroxyanthraquinone product, more than 60 tons of reddish-brown wastewater will be discharged, and its COD Cr Up to 10,000-25,000 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/26C02F1/02C02F1/66C02F101/34C02F103/34
Inventor 董自斌赵焰王克云杨志林王开春郭涛李学字刘德敏
Owner BLUESTAR LEHIGH ENG INST CO LTD
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