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Method for treating aniline wastewater by utilizing tubular reactor

A tubular reactor and waste water technology, applied in chemical instruments and methods, chemical/physical/physicochemical fixed reactors, filtration treatment, etc., can solve the problem of biological treatment with large area, harsh reaction conditions, and test conditions Requirements and other issues, to achieve significant economic and environmental benefits, the method is simple and easy, and the effect of efficient treatment

Inactive Publication Date: 2018-11-27
杭州百合辉柏赫颜料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the extraction method is only a physical transfer process of pollutants, and the extraction agent may cause secondary pollution to the environment; although the membrane separation method has a good effect on wastewater treatment, it needs regular chemical cleaning and high operating costs; although the Fenton oxidation method is effective Obviously, but the reaction conditions are relatively harsh, the cost of the oxidant is high, and it is not convenient for storage and transportation; the biological treatment occupies a large area and is not suitable for treating high-concentration aniline wastewater, and the requirements for the test conditions are relatively harsh

Method used

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  • Method for treating aniline wastewater by utilizing tubular reactor
  • Method for treating aniline wastewater by utilizing tubular reactor

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Experimental program
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Effect test

Embodiment 1

[0046] Embodiment 1: As shown in the figure, in the present invention, after diazotizing the aniline substances in the aniline wastewater, it is coupled with the azo pigment wastewater containing active groups and dissolved, and the highly toxic aniline substances And other organic compounds are also precipitated from the wastewater, the aniline value and COD of the wastewater are significantly reduced, and the subsequent treatment pressure is greatly reduced. See the following examples for details.

[0047] Example 1:

[0048] Take 500ml of aniline waste water (aniline value 23650ppm, COD is 36500ppm) in a certain intermediate section of the workshop, add metered hydrochloric acid, and the material becomes a clear and transparent solution. Add ice to cool down to about 0°C, start adding metered sodium nitrite solution under the liquid, and control the adding speed of sodium nitrite solution until the diazotization reaction is basically complete. Add the above-mentioned diaz...

Embodiment 2

[0050] Under the condition of other conditions unchanged in Example 1, the diazotization reaction of aniline wastewater was carried out in the tubular reactor, the removal rate of aniline was 99.70%, and the removal rate of COD was 32.46%.

Embodiment 3

[0052] Under the same conditions in Example 1, the diazotization reaction of aniline wastewater and its coupling reaction with Pigment Yellow 74 wastewater were carried out successively in two continuous tubular reactors, and the removal rate of aniline was 99.69%. The removal rate of COD is 35.03%.

[0053] In summary, after diazotization of anilines in aniline wastewater, coupling with wastewater containing active groups and dissolved azo pigments, highly toxic anilines and other organic compounds were also precipitated from the wastewater , the aniline value and COD of wastewater are significantly reduced, and the subsequent treatment pressure is greatly reduced.

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Abstract

The invention relates to a method for treating aniline wastewater and in particular relates to a method for treating aniline wastewater by utilizing a tubular reactor. The method comprises the following steps: adding a certain amount of acid into aniline wastewater, and acidifying; pumping the acidified aniline wastewater and a sodium nitrite solution into the tubular reactor from different pipelines for performing diazotization, discharging the obtained diazonium salt from another outlet, coupling to azo pigment wastewater (containing a small amount of organic matters capable of being coupledto the diazonium salt), delivering the coupled fluid into a settling basin, performing separating treatment, discharging the filtrate into a sewage treatment plant to be further treated, and drying the filter residue for incineration disposal, wherein the aniline removal rate in the wastewater is 99% or higher, and the removal rate of COD (Chemical Oxygen Demands) is 30% or higher. The aniline wastewater problem in the production process of a pigment intermediate DATA (DTTA) (Di-p-Toluoyl-L-Tartaric Acid) is effectively solved, the aim of treating the wastewater with wastewater is achieved, the production cost is saved, and the method has significant economic benefits and environmental benefits.

Description

technical field [0001] The invention relates to a method for treating aniline wastewater, in particular to a method for treating aniline wastewater by using a tubular reactor, and relates to diazonium treatment of aniline wastewater produced in the production process of quinacridone intermediate DATA (DTTA). Chemical-coupling treatment. Background technique [0002] There are many ways to synthesize quinacridone compounds, which can be divided into halogenated terephthalic acid method, hydroquinone or p-benzoquinone method, diketene method, and succinic acid di A (b) ester method (DMSS method). The main method commonly used at present is the dimethyl (ethyl) succinate method (DMSS method), which can be subdivided into thermal closed-loop route (HTR) and acid closed-loop route (PPA) according to the closed-loop conditions, among which the most widely used What is the acid ring closure route (PPA). [0003] Acid ring-closing route (PPA route): the first step is to condense ...

Claims

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Application Information

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IPC IPC(8): C02F9/04B01J19/24C02F101/30C02F101/38
CPCB01J19/2415B01J19/242C02F1/001C02F1/38C02F1/52C02F1/66C02F9/00C02F2001/007C02F2101/308C02F2101/38C02F2209/08
Inventor 冯梦龙马引民黄卓李小华葛海洋彭敬慧万琪
Owner 杭州百合辉柏赫颜料有限公司