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Method for extraction dephenolization of high-concentration chemical wastewater containing phenol ammonia coals

A coal chemical wastewater, high-concentration technology, applied in chemical instruments and methods, extraction water/sewage treatment, water pollutants, etc., can solve the problems of low extraction rate and excessive phenol content, and achieve high extraction rate, cost saving, Guarantee the effect of up-to-standard discharge

Inactive Publication Date: 2014-01-08
HENAN DRAGON INTO COAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The change in the plan uses isopropyl ether for phenol extraction, and the extraction rate is low, so that the phenol content in the discharged wastewater exceeds the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A set of extraction and dephenolization equipment with a treatment capacity of 80 t / h for high-concentration phenol ammonia-containing coal chemical wastewater, with a total phenol content of 5000 mg / L and a COD of 40000 mg / L.

[0046] Using the method for extraction and dephenolation of high-concentration phenolic ammonia-containing coal chemical wastewater of the present invention, butyl acetate and high-concentration phenolic ammonia-containing coal chemical wastewater are pumped into the top and bottom of the extraction tower at a volume ratio of 1:10, and contacted in countercurrent , the extraction temperature is 25°C, the extraction pH is 3.0, and the extraction stage is 1 stage to obtain the extract phase and the raffinate phase;

[0047] Then in the rectification tower, the extraction phase is processed by rectification. The number of rectification towers is 8, the reflux ratio is 0.3, the operating pressure is 0.01 MPa, the operating temperature at the top of t...

Embodiment 2

[0052] A set of extraction and dephenolization equipment with a treatment capacity of 130 t / h of high-concentration phenol ammonia-containing coal chemical wastewater, with a total phenol content of 16320 mg / L, pH=6.0, and COD 32500 mg / L.

[0053] Using the method for extraction and dephenolation of high-concentration phenol ammonia-containing coal chemical wastewater of the present invention, butyl acetate and high-concentration phenol ammonia-containing coal chemical wastewater are pumped from the top and bottom of the extraction tower at a volume ratio of 1:15, and contacted in countercurrent , the extraction temperature is 35°C, the extraction pH=4.0, and the number of extraction stages is 5, to obtain the extract phase and the raffinate phase;

[0054] The extraction phase is rectified, the number of rectification towers is 15, the reflux ratio is 0.4, the operating pressure is 0.04 MPa, the operating temperature at the top of the rectifying tower is controlled at 60°C, an...

Embodiment 3

[0059] A set of extraction and dephenolization equipment with a treatment capacity of 200 t / h for high-concentration phenol ammonia-containing coal chemical wastewater has a total phenol content of 12,800 mg / L, pH=8.7, and COD 37,000 mg / L.

[0060] Using the method for extracting and dephenolizing high-concentration phenolic ammonia-containing coal chemical wastewater of the present invention, butyl acetate and high-concentration phenolic ammonia-containing coal chemical wastewater are pumped into the top and bottom of the extraction tower at a volume ratio of 1:25, and contacted in countercurrent , the extraction temperature is 65°C, the extraction pH=6.0, and the number of extraction stages is 8, to obtain the extract phase and the raffinate phase;

[0061] The extraction phase is rectified, the number of rectification towers is 20, the reflux ratio is 0.4, the operating pressure is 0.07 MPa, the operating temperature at the top of the rectifying tower is controlled within 90...

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Abstract

The invention discloses a method for extraction dephenolization of high-concentration chemical wastewater containing phenol ammonia coals. According to the method, the high-concentration chemical wastewater containing the phenol ammonia coals is in countercurrent contact with butyl acetate in an extraction tower, an extraction phase is obtained at the top of the tower, and an extraction residual phase is obtained at the bottom of the tower; the extraction phase is subjected to rectification to recover an extracting agent and a product of crude phenol, the extracting agent is recycled, and the crude phenol is sold or refined. Compared with an extraction technology related in the prior art, the recovery energy consumption of butyl acetate is lower, the process flow of the method disclosed by the invention is simple, and the extraction rate of phenol is high. By using the extracting agent in the method, the burden of follow-up biochemical treatment of wastewater can be reduced more effectively, the cost can be saved, and the recycling and up-to-standard release of wastewater are ensured.

Description

technical field [0001] The invention relates to the technical field of extracting and dephenolizing coal chemical wastewater, in particular to a method for extracting and dephenolizing coal chemical wastewater containing high concentration of phenol and ammonia. Background technique [0002] Coal chemical production will produce a large amount of wastewater containing phenol and ammonia, with complex components, and direct discharge will seriously pollute the environment. At the same time, phenols are also important chemical raw materials, which can be recycled as resources. 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, for coal chemical wastewater, commonly used extractants include isopropyl ether, methyl isobutyl ketone, methyl tert-amyl ether, heavy benzene, N503, etc. But these extractants all have their obvious d...

Claims

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Application Information

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IPC IPC(8): C02F1/26C02F101/34
Inventor 白太宽王洪博周景龙杨孔林徐丹
Owner HENAN DRAGON INTO COAL TECH CO LTD
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