Ortho-aminophenol wastewater treatment method

A technology for o-aminophenol and wastewater treatment, which is applied in multi-stage water treatment, special compound water treatment, extraction water/sewage treatment, etc. It can solve the problem of not finding o-aminophenol production wastewater recycling, serious three-waste pollution, and poor biodegradability. and other problems, to achieve the effect of good effect, huge economic and social benefits, and low cost

Inactive Publication Date: 2015-02-18
ZHENGZHOU UNIVERSITY OF AERONAUTICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because it contains benzene ring, it is highly toxic, and the biodegradability of wastewater discharged during production is poor, causing great harm to the environment.
The traditional synthesis method is to use o-nitrochlorobenzene as raw material, hydrolyze and reduce iron powder to make it. The three wastes ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In concrete implementation, the present invention can be realized by the following steps:

[0021] (1) Wastewater pretreatment:

[0022] Filter the o-aminophenol wastewater to remove suspended solids and solid impurities, and adjust the pH value to 6-8 with sodium hydroxide or sulfuric acid;

[0023] (2), preparation of compound extractant:

[0024] The compound extractant is composed of bis(2-ethylhexyl) phosphate, tri(octyl-decyl)alkyl tertiary amine and diluent, wherein, bis(2-ethylhexyl)phosphate and tri(octyl-decyl) Decyl) alkyl tertiary amines are mixed together in a weight ratio of 1:2-4 to form a mixture, the mixture is dissolved in the diluent, and the weight ratio of the mixture to the diluent is 1:6-8;

[0025] (3), extraction reaction:

[0026] Add the composite extractant to the inlet of the wastewater pump, and enter the cyclone air flotation extractor together with the pretreated o-aminophenol wastewater. At the same time, air or nitrogen is introduced...

Embodiment 2

[0031] The present invention can also be realized by the following steps in concrete implementation:

[0032] (1) Wastewater pretreatment:

[0033] Filter the o-aminophenol wastewater to remove suspended solids and solid impurities, and adjust the pH value to 6-8 with sodium hydroxide or sulfuric acid;

[0034] (2), preparation of compound extractant:

[0035] The compound extractant is composed of bis(2-ethylhexyl) phosphate, tri(octyl-decyl)alkyl tertiary amine and diluent, wherein, bis(2-ethylhexyl)phosphate and tri(octyl-decyl) Decyl) Alkyl tertiary amines are mixed together in a weight ratio of 1:3 to form a mixture, the mixture is dissolved in octanol or kerosene, and the weight ratio of the mixture to octanol or kerosene is 1:7.5;

[0036] (3), extraction reaction:

[0037] Add the composite extractant to the inlet of the wastewater pump, and enter the cyclone air flotation extractor together with the pretreated o-aminophenol wastewater. At the same time, air or nitr...

Embodiment 3

[0042] In specific implementation, the present invention can also be realized by the following steps:

[0043] (1) Wastewater pretreatment:

[0044] Filter the o-aminophenol wastewater to remove suspended solids and solid impurities, and adjust the pH value to 6-8 with sodium hydroxide or sulfuric acid;

[0045] (2), preparation of compound extractant:

[0046] The compound extractant is composed of bis(2-ethylhexyl) phosphate, tri(octyl-decyl)alkyl tertiary amine and diluent, wherein, bis(2-ethylhexyl)phosphate and tri(octyl-decyl) Decyl) alkyl tertiary amines are mixed together in a weight ratio of 1:2 to form a mixture, the mixture is dissolved in chloroform, and the weight ratio of the mixture to chloroform is 1:6;

[0047] (3), extraction reaction:

[0048] Add the composite extractant to the inlet of the wastewater pump, and enter the cyclone air flotation extractor together with the pretreated o-aminophenol wastewater. At the same time, air or nitrogen is introduced. U...

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PUM

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Abstract

The invention relates to an ortho-aminophenol wastewater treatment method which effectively solves the problems of treatment for ortho-aminophenol wastewater and implementation of wastewater recovery. The method comprises the following steps: filtering the ortho-aminophenol wastewater, and regulating the pH value to 6-8; preparing a composite extractant from bis(2-ethylhexyl) phosphate, tri(octyl-deca)alkyl tertiary amine and a diluter, sending the composite extractant and ortho-aminophenol wastewater into a cyclone floatation extraction apparatus, introducing air or nitrogen, reacting for 0.3-1.5 hours, transferring the ortho-aminophenol from the wastewater phase into the oil phase, sending the wastewater into an ozone reaction tower, and adding H2SO4 or HCl into the cyclone floatation extraction apparatus, wherein the composite extractant in the cyclone floatation extraction apparatus is regenerated and recovered by utilizing the H2SO4 or HCl; and introducing ozone from the bottom of the ozone reaction tower, adding a catalyst into the wastewater to remove the residual micromolecule organic pollutants, and directly recovering the wastewater. The method is simple to operate, has the advantages of low cost, favorable effect and high recovery rate of ortho-aminophenol (up to 99% above), improves the environment and saves the resources.

Description

technical field [0001] The invention relates to wastewater treatment, in particular to a method for treating o-aminophenol wastewater. Background technique [0002] With the development of modern industry, the pharmaceutical and dye industry is playing an increasingly important role, and it is also an area that has received a lot of attention, because in the production process of pharmaceuticals and dyes and their intermediates, there are a large number of inorganic raw materials and The organic raw materials are transferred to the wastewater, so that the wastewater has high pollutant concentration, deep color, high salt content, high toxicity, and is difficult to treat. However, most of the technologies used in the production of aminophenol in my country are relatively backward, resulting in a large amount of wastewater. polluted environment. If it is not recycled and handled properly, it will not only cause economic losses, but also pollute the environment. [0003] O-amin...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/38
CPCC02F1/001C02F1/26C02F1/66C02F1/78C02F9/00C02F2101/38C02F2301/08C02F2305/02
Inventor 崔节虎杜秀红段显英李春光陶贺郑宾国
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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