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Recycling treatment method for anilines intermediate production wastewater

A technology for the production of waste water and treatment methods, which is applied in the direction of neutralization water/sewage treatment, multi-stage water treatment, water/sewage treatment, etc. It can solve problems such as difficult removal of high-salt components in waste water, expensive resin, and difficult recovery of analytical solution , to achieve the effect of mild conditions, reduced dosage, and improved economic benefits

Inactive Publication Date: 2016-11-30
ZHEJIANG DIBANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Oxidation method can further degrade the toxic and harmful components in wastewater, increase the B / C value, and facilitate biodegradation. This method can be used as an auxiliary step in biological treatment, but it is difficult to remove high-salt components in wastewater, so it is difficult to treat anilines alone Intermediate wastewater
[0007] (3) Biological method: Biological treatment is generally divided into anaerobic and aerobic treatment. Through the metabolism of bacteria, part of the organic components in wastewater are used for self-synthesis, and part of them are converted into non-toxic and harmless substances, thereby realizing Comprehensive treatment of wastewater, but bacteria have less demand for salt, high-salt wastewater will cause bacteria to dehydrate and die, resulting in the collapse of the biochemical system, so it is impossible to use biological treatment alone to deal with high-salt, high-COD aniline intermediates waste water
[0008] The Chinese invention patent document with the publication number CN104803529A discloses a method for treating aniline intermediate waste water by using resin adsorption, multi-effect evaporation concentration and mixed treatment. This method can effectively treat aniline intermediate waste water, but because the resin is expensive, the adsorption The problems of low efficiency, poor regeneration efficiency, and difficult recovery of analytic solution greatly limit its application.
[0009] The Chinese invention patent document with the publication number CN1769206A discloses a method for using a synthetic macroporous polymer to immobilize microorganisms to strengthen SBR to treat aniline production wastewater. Adding substances to the bioreactor containing activated sludge can improve the removal rate of COD by biological treatment, but it is mainly aimed at low-concentration COD aniline wastewater, and it is not feasible for high-concentration COD aniline wastewater

Method used

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  • Recycling treatment method for anilines intermediate production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Collect respectively the mother liquor water (that is, cyanoethylaniline and benzyl chloride react to produce waste water containing sodium chloride under the action of soda ash) and washing water for the production of N-cyanoethyl-N-benzylaniline, wherein the washing water Back to the production of intermediates. The mass percent content of sodium chloride in the mother liquor water is 15%, the COD is 17400 mg / L, and the chromaticity is 1800 times.

[0054] The mother liquid water enters the flocculation tank, and the waste lye produced in industrial production is added to adjust the pH to 7-8. Under the condition of stirring, polyacrylamide aqueous solution is continuously added. The mass fraction of polyacrylamide aqueous solution is 0.2%, and the dosage is 0.1% by mass, after continuous stirring for 15 minutes, settle naturally for 1 hour, press filter, and recover the intermediate to obtain the precipitate I and the treatment solution I respectively.

[0055] ...

Embodiment 2

[0065] (1) Collect respectively the mother liquor water (that is, cyanoethylaniline and benzyl chloride react to produce waste water containing ammonium chloride under the action of ammonia) and washing water for the production of N-cyanoethyl-N-benzylaniline, wherein the washing water Back to the production of intermediates. The mass percent content of ammonium chloride in the mother liquor water is 18%, the COD is 16200 mg / L, and the chromaticity is 1700 times.

[0066] The mother liquid water enters the flocculation tank, and the waste lye produced in industrial production is added to adjust the pH to 7-8. Under the condition of stirring, polyacrylamide aqueous solution is continuously added. The mass fraction of polyacrylamide aqueous solution is 0.2%, and the dosage is 0.1% by mass, after continuous stirring for 15 minutes, settle naturally for 1 hour, press filter, and recover the intermediate to obtain the precipitate I and the treatment solution I respectively.

[006...

Embodiment 3

[0077] (1) collect respectively the mother liquor water (that is 2-amino-4-acetamidoanisole and allyl chloride under the action of ammonia water) of producing N, N-diallyl-2-methoxy-5-acetamidoaniline The reaction produces waste water containing ammonium chloride) and washing water, wherein the washing water is reused for the production of intermediates. The mass percent content of ammonium chloride in the mother liquor water is 12%, the COD is 10960 mg / L, and the chromaticity is 1500 times.

[0078] The mother liquid water enters the flocculation tank, and the waste lye produced in industrial production is added to adjust the pH to 7-8. Under the condition of stirring, polyacrylamide aqueous solution is continuously added. The mass fraction of polyacrylamide aqueous solution is 0.2%, and the dosage is 0.1% by mass, after continuous stirring for 15 minutes, settle naturally for 1 hour, press filter, and recover the intermediate to obtain the precipitate I and the treatment sol...

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Abstract

The invention provides a recycling treatment method for anilines intermediate production wastewater. The method includes the following steps of (1) flocculation: separately collecting and regulating the pH (potential of hydrogen) value of wastewater, adding flocculant for flocculation, and filtering to obtain precipitate I and treating fluid I; (2) oxidation: regulating the pH value of the treating fluid I, adding oxidizing agent, and performing adequate oxidation to obtain treating fluid II; (3) adsorption bleaching: regulating the pH value of the treating fluid II, adding adsorbent, and performing full adsorption prior to separation to obtain treating fluid III; (4) neutralization, concentration and crystallization: regulating pH value of the treating fluid III, entering a concentration device for concentration and crystallization, performing separation to obtain sodium chloride or ammonium chloride solid, returning mother fluid to the concentration device for continuous concentration and crystallization, and collecting condensate, namely treating fluid IV; (5) biological treatment: subjecting the treating fluid IV to treatment in a biological aerated filter to obtain treating fluid V, so as to finish treatment.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a resource treatment method for waste water produced by aniline intermediates. Background technique [0002] Aniline intermediates are important chemical raw materials for the synthesis of disperse dyes, and China is a major producer of aniline dye intermediates. However, with the increasing output of dye intermediates, dye intermediate wastewater has brought serious environmental pollution problems. It has brought tremendous pressure to the development of the dye intermediate industry. [0003] Aniline dye intermediates have the characteristics of complex structure, long synthesis process, and many side reactions, resulting in a large amount of wastewater with complex components and high concentration in the production process. This kind of dye intermediate wastewater is organic wastewater with high concentration, high chroma and high salt content, so it is relati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/048C02F1/281C02F1/283C02F1/32C02F1/5236C02F1/56C02F1/66C02F1/722C02F1/74C02F1/76C02F1/78C02F3/02C02F9/00C02F2101/308C02F2301/08C02F2303/16
Inventor 徐万福傅伟松王永唐智勇陈华祥陈栋超
Owner ZHEJIANG DIBANG CHEM
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