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Coal chemical phenol-containing waste water dephenolization method

A technology for coal chemical wastewater and phenol wastewater, applied in extraction water/sewage treatment and other directions, can solve the problems of low extraction rate of crude benzene and medium oil, weak polyphenol extraction ability, secondary pollution, etc., and achieves low equipment investment and solvent The effect of recycling low energy consumption and reducing load

Inactive Publication Date: 2012-02-01
QINGDAO JUNYANG CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these extractants all have their obvious defects, such as the diisopropyl ether has weak extraction ability to polyphenols, the energy consumption of methyl isobutyl ketone is too high when solvent recovery is carried out, crude benzene and medium oil not only have low extraction rate, and only It can recover solvents by adopting back-extraction process with complex process and secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A set of coal gasification wastewater treatment device with a processing capacity of 80 tons / hour of wastewater has a total phenol content of 6200mg / L, pH 7.0, and COD 25000mg / L. Using the method of the present invention, the extractant is selected from methyl tert-amyl ether, The extraction equipment is an extraction tower. Pump waste water and extractant into the extraction tower from the top and bottom of the extraction tower respectively, and perform countercurrent extraction to obtain solvent phase and raffinate aqueous phase. The ratio is 1:7, and the number of extraction stages is 4.

[0018] Then the solvent phase is rectified to recover the solvent and crude phenol, and the raffinate water phase is recovered to the residual extraction solvent by distillation. The rectification process conditions are: the theoretical stages of the rectification tower are 15-25, the reflux ratio is 0.1-1, the operating pressure is 0.01-0.11MPa, the operating temperature at the t...

Embodiment 2

[0022] A set of coal gasification wastewater treatment device with a processing capacity of 130 tons / hour of wastewater, the total phenol content is 5900mg / L, pH 8.0, COD 22000mg / L, using the method of the present invention, the extraction agent is selected from methyl tert-amyl ether, The extraction equipment is a four-stage mixing clarifier in series. Add wastewater and extractant from the first and last mixing clarifiers respectively to obtain solvent phase and raffinate water phase. The extraction temperature is 55°C, the extraction pH is 8.0, and the volume ratio of extractant to wastewater containing phenol is 1 : 8, the number of extraction stages is 6. Then the solvent phase is rectified to recover the solvent and crude phenol, and the raffinate water phase is recovered to the residual extraction solvent by distillation. The process conditions are the same as in Example 1. The recovered extractant is recycled.

[0023] The total phenol content in the treated wastewat...

Embodiment 3

[0025] A set of coal gasification wastewater treatment device with a treatment capacity of 300 tons / hour of wastewater, with a total phenol content of 7600mg / L, pH 6.5, and COD of 19000mg / L, adopts the method of the present invention, and the extraction agent is selected from methyl tert-amyl ether, The extraction equipment is an extraction tower. Pump waste water and extractant into the extraction tower from the top and bottom of the extraction tower respectively, and perform countercurrent extraction to obtain solvent phase and raffinate aqueous phase. The ratio is 1:20, and the extraction stage is 1 stage. Then the solvent phase is rectified to recover the solvent and crude phenol, and the raffinate water phase is recovered to the residual extraction solvent by distillation. The process conditions are the same as in Example 1. The recovered extractant is recycled.

[0026] The total phenol content in the treated wastewater is about 280mg / L, and the COD is about 3000mg / L. ...

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Abstract

The invention discloses a coal chemical phenol-containing waste water dephenolization method, which comprises the following steps of: using tert-amyl methyl ether as a main extractant, extracting the coal chemical phenol-containing waste water and the extractant in an extraction tower or a multistage mixing clarifier to obtain a solvent phase and a raffinate phase; carrying out rectification on the solvent phase, and recovering a solvent and crude phenols; distilling the raffinate phase, and recovering a residual extraction solvent; and recycling the recovered extractant. In comparison with the prior art, the method provided by the invention has advantages of simple process flow, less equipment investment, low energy consumption of solvent recovery and high phenol recovery efficiency; in addition, petroleum hydrocarbon and tar pollutants can be simultaneously and efficiently removed. By the adoption of the method, subsequent biochemical load can be more effectively mitigated so as to guarantee standard discharge or reuse of waste water.

Description

technical field [0001] The invention relates to an extraction and dephenolization method for phenol-containing wastewater of coal chemical industry, which can efficiently remove and recover phenols in phenol-containing wastewater of coal chemical industry, and realize the harmlessness and resource utilization of such wastewater. It belongs to the field of waste water treatment. Background technique [0002] In the dry distillation, drying and gasification process of low-quality coal, a large amount of gasification wastewater will be produced, containing high concentrations of phenols and other pollutants. Phenols have strong biological toxicity and great harm. At the same time, phenols are also important chemical raw materials. Therefore, the efficient removal and recovery of phenolic substances in coal chemical wastewater is not only of environmental significance, but also of certain economic significance. [0003] At present, in industrial installations, liquid-liquid ex...

Claims

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Application Information

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IPC IPC(8): C02F1/26
Inventor 朱艳红
Owner QINGDAO JUNYANG CHEM TECH
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