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Technique for reclaiming waste water of azoic dye production

An azo dye and wastewater recycling technology, which is applied in the fields of neutralization water/sewage treatment, aerobic and anaerobic process treatment, natural water treatment, etc. It can solve the problems of polluted environment, unrecycled wastewater, and damage to the ecological environment of water bodies.

Inactive Publication Date: 2009-04-22
SHANGYU JINGUAN CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Usually, in the synthetic production of dyestuffs, a large amount of mother liquor wastewater and washing wastewater will be produced. Because of their high COD value and chromaticity, if they are discharged directly without treatment, it will cause damage to the ecological environment of the water body and seriously pollute the environment.
At present, there have been many reports on the treatment technologies of dye production wastewater, such as adsorption decolorization method, catalytic oxidation method, biochemical method, iron-carbon micro-electrolysis method, etc. These methods have achieved certain effects on the treatment of dye wastewater. However, the wastewater has not been recycled; in addition, there are also studies on the application of dyestuffs to the wastewater generated in the textile fiber dyeing process and then reuse them in the dyeing process, such as "Decolorization and Reuse of Disperse Dyeing Wastewater", but the production of dyestuff itself There is no systematic report on the waste water generated in the process and then recycled

Method used

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  • Technique for reclaiming waste water of azoic dye production
  • Technique for reclaiming waste water of azoic dye production
  • Technique for reclaiming waste water of azoic dye production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Preparation of C.I. Disperse Blue 291

[0016] Add 1176kg of 98% sulfuric acid and 280kg of nitrosyl sulfuric acid solution into the reactor, and slowly add 524kg of sulfuric acid. 2,4-Dinitro-6-bromoaniline, stir to dissolve, control the temperature at about 25°C for reaction, use starch potassium iodide test paper to indicate the end point to prepare diazonium salt. The above-prepared diazonium salt is slowly added to the 473kg 2-methoxy-5-acetamido-N,N-diethylaniline suspension for coupling reaction, and the coupling temperature is controlled to 0~ The coupling reaction was carried out at 5°C. After the reaction was completed, the coupling liquid was suction filtered, and at the same time, about 85 tons of fresh water was used to wash to neutrality, and the material was discharged to obtain CI Disperse Blue 291 filter cake.

[0017] (2) Treatment and recovery of mother liquor water and washing water

[0018] Collect the mother liquor water of the CI Disperse Blue 291...

Embodiment 2

[0025] According to the preparation method described in Example 1, the difference is:

[0026] In step (1), replace 473 kg of 2-methoxy-5-acetamido-N,N-diethylaniline suspension with 413 kg of 3-acetamido-N,N-diethylaniline suspension. 70 tons of fresh water replaces 85 tons of fresh water to wash the dye filter cake;

[0027] In step (2), replace C.I. Disperse Blue 291 with C.I. Disperse Violet 93;

[0028] In step (3), 12 tons of fresh water and 58 tons of recycled water were used instead of 70 tons of fresh water in step (1) of Example 2 to wash the filter cake to neutrality to obtain a C.I. Disperse Violet 93 filter cake.

Embodiment 3

[0030] (1) Preparation of C.I. Disperse Orange 73

[0031] Add 1225 kg of 98% sulfuric acid solution and 333 kg of nitrosyl sulfuric acid solution into the reaction kettle, slowly add 345 kg of p-nitroaniline, stir to dissolve, and control the temperature at about 15°C for reaction. Use starch potassium iodide test paper to indicate the end point. Get p-nitroaniline diazonium salt. Slowly add the prepared diazonium salt to 735kg N-cyanoethyl-N-benzoyloxyethylaniline suspension, control the coupling temperature below 15°C, and stir for about 6 hours, then The temperature was raised to about 60°C, and the temperature was kept stirring for 2 hours. The coupling mother liquor was press-filtered, and the coupling material was washed to neutrality with 80 tons of fresh water, and the material was discharged to obtain the dye CI dispersion orange 73 filter cake.

[0032] (2) Treatment and recovery of mother liquor water and washing water

[0033] Collect the mother liquor water of the CI...

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Abstract

The invention provides a wastewater recycling process in coupling dye production. The process comprises the steps of treating a large amount of mother solution wastewater and washing wastewater produced during dye production for washing of filter cakes. By using the wastewater recycling process, on the whole processes of dye filter cake production, only bottom water and ice for coupling are newly increased sewage sources; the dye filter cakes are washed by recycled sewage after oxidation treatment, so sewage drainage can be reduced by more than 80 percent in comparison with the prior art; and indexes such as intensity, chromatic light and the like of dye washed by recycled wastewater are approximate to the indexes of the dye washed by tap water.

Description

(1) Technical field [0001] The invention relates to a process for recycling waste water in the production of azo dyes, and in particular to a process method for processing and recycling waste water from the filtration and washing part of the production of azo dyes. (2) Background technology [0002] Generally, in the synthetic production of dyes, a large amount of mother liquor wastewater and washing wastewater will be produced. Because of its high COD value and chromaticity, if it is discharged directly without treatment, it will cause damage to the ecological environment of the water body and seriously pollute the environment. At present, many documents have reported on the treatment technology of dye wastewater, such as adsorption decolorization method, catalytic oxidation method, biochemical method, iron-carbon micro-electrolysis method, etc. These methods have achieved certain effects on the treatment of dye wastewater. However, the wastewater is not recycled and applied; in...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30C02F1/52C02F1/72C02F1/66C02F103/36
Inventor 欧其童海祥
Owner SHANGYU JINGUAN CHEM IND
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