Complexation extraction dephenolization method of semi coke wastewater containing phenol

A technology for phenol wastewater and extraction, which is applied in chemical instruments and methods, extraction water/sewage treatment, water pollutants, etc. It can solve the problems of high treatment cost, unsatisfactory treatment effect and large loss of chemical precipitation method and advanced oxidation method

Inactive Publication Date: 2012-08-22
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these methods, the industrial application of membrane separation method is relatively difficult, and the treatment cost of chemical precipitation method and advanced oxidation method is relatively high
Therefore, the current research on high-concentration phenol-containing wa

Method used

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  • Complexation extraction dephenolization method of semi coke wastewater containing phenol
  • Complexation extraction dephenolization method of semi coke wastewater containing phenol

Examples

Experimental program
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Effect test

Embodiment 1

[0014] As shown in the accompanying drawing, a method for complex extraction dephenolization of blue charcoal phenol-containing wastewater, the steps are as follows:

[0015] 1) Prepare the extractant, which is composed of complexing agent + diluent, wherein tributyl phosphate is the complexing agent, toluene is the diluent, and the volume ratio of the extractant is that the complexing agent accounts for 20%, and the rest is the diluent. Mix complexing agent and diluent evenly at room temperature for later use.

[0016] 2) Adjust the pH of the semi-charcoal-containing phenolic wastewater to 8, mix the extractant and semi-charcoal-containing phenolic wastewater in a volume ratio of 1:1, and place it in a constant temperature water bath to shake for 50 minutes at a temperature of 25°C.

[0017] 3) Put the above mixed solution at room temperature for phase separation to obtain a solvent phase and a raffinate aqueous phase.

[0018] 4) Using 10% sodium hydroxide solution as a str...

Embodiment 2

[0022] 1) Prepare the extractant, which is composed of complexing agent + diluent, wherein tributyl phosphate is the complexing agent, toluene is the diluent, and the volume ratio of the extractant is that the complexing agent accounts for 20%, and the rest is the diluent. Mix complexing agent and diluent evenly at room temperature for later use.

[0023] 2) Adjust the pH of the semi-charcoal phenol-containing wastewater to 8, mix the extraction agent and the semi-charcoal-containing phenol-containing wastewater evenly at a volume ratio of 1:10, and place them in a constant temperature water bath and shake for 50 minutes at a temperature of 25°C.

[0024] 3) Put the above mixed solution at room temperature for phase separation to obtain a solvent phase and a raffinate aqueous phase.

[0025] 4) Using 10% sodium hydroxide solution as a stripping agent to strip and regenerate the solvent phase rich in phenols. In the stripping operation, the operating volume ratio range is lye / ...

Embodiment 3

[0029] 1) Prepare the extractant, which is composed of complexing agent + diluent, wherein tributyl phosphate is the complexing agent, toluene is the diluent, and the volume ratio of the extractant is that the complexing agent accounts for 20%, and the rest is the diluent. Mix complexing agent and diluent evenly at room temperature for later use.

[0030] 2) Adjust the pH of the semi-charcoal-containing phenolic wastewater to 8, mix the extractant and semi-charcoal-containing phenolic wastewater at a volume ratio of 1:20, and place it in a constant temperature water bath for 50 minutes at a temperature of 25°C.

[0031] 3) Put the above mixed solution at room temperature for phase separation to obtain a solvent phase and a raffinate aqueous phase.

[0032] 4) Using 10% sodium hydroxide solution as a stripping agent to strip and regenerate the solvent phase rich in phenols. In the stripping operation, the operating volume ratio range is lye / solvent phase of 1:1, and then the m...

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Abstract

The invention relates to a complexation extraction dephenolization method of a semi coke wastewater containing phenol. An extractant and semi coke wastewater containing phenol are arranged in a thermostat water bath to be shaken, and stand still at a normal temperature to be subject to split phase so as to obtain a raffinate water phase and a solvent phase rich in phenols, the obtained solvent phase rich in the phenols is reextracted with back-extractant sodium hydroxide, the obtained regenerated extractant is recycled, and the obtained phenol resources are recovered. A complexation extraction method is adopted for the dephenolization process of the semi coke wastewater containing phenol, tributyl phosphate is used as a complexing agent, toluene is used as a diluent, and due to a special complexation extraction mechanism, a distribution coefficient of the complexation extraction dephenolization method is higher, the extracting power is strong, a complexation extractant has the advantage of reuse after being reextracted with alkali liquor, and valent matters in the wastewater are enriched, separated and recycled with the alkali liquor so as to realize the efficient treatment and resource recycling of phenols.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a complex extraction and dephenolization method for blue charcoal phenol-containing wastewater. Background technique [0002] Semi-coke wastewater is often produced in the process of low-temperature dry distillation of raw coal, gas purification and refining of chemical products. The composition of the wastewater is complex and contains a large number of pollutants that have not been oxidized by high temperature. Compared with coking wastewater, the COD of semi-coke wastewater is about 10 times higher, and the concentration of phenols and ammonia nitrogen in this wastewater is also much higher than that of coking wastewater. It can be seen that semi-coke wastewater is a typical refractory organic wastewater, which is difficult to treat and has become an urgent problem in the field of environmental protection. The phenol content of semi-charcoal wastewater is 3000m...

Claims

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Application Information

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IPC IPC(8): C02F1/26C02F101/34
Inventor 薛娟琴毕强郭莹娟李国平汪丛
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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