Method for dephenolization of phenolic wastewater through multi-stage mixed intensified separation

A technology for strengthening separation and phenol wastewater, applied in separation methods, chemical instruments and methods, solvent extraction, etc., can solve the problems of increasing energy consumption of extracting agent by stripping and recovering, large amount of extraction of raffinate phase, and difficult control of separation interface, etc. Achieve the effects of easy online analysis and automatic control, fast mass transfer balance, and avoidance of back-mixing

Active Publication Date: 2017-06-20
CCTEG CHINA COAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the extraction unit of phenol-containing wastewater in the industrial field is usually carried out in the extraction tower, mainly the packed extraction tower and the rotary disk extraction tower, both of which have relatively serious inter-sta

Method used

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  • Method for dephenolization of phenolic wastewater through multi-stage mixed intensified separation
  • Method for dephenolization of phenolic wastewater through multi-stage mixed intensified separation

Examples

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Example Embodiment

[0038] Example 1. Extraction and dephenolization of coal chemical wastewater containing phenol

[0039] according to figure 2 The process flow chart shown is the extraction and dephenolization of coal chemical wastewater containing phenol, the specific steps are as follows:

[0040] (1) The volume ratio of the extractant (methyl isobutyl ketone) and phenol-containing wastewater (total phenols 5750mg / L, polyphenols 1820mg / L, COD content 19340mg / L, pH value 8.0) are reversed. The direction is sent to the multi-stage extraction device with 5 high-gravity extractors in series for multi-stage countercurrent extraction (5 stages), and the final extraction phase (containing crude phenol and extractant) and the final raffinate phase (wastewater containing a small amount of extractant) are collected );

[0041] Each high-gravity extraction machine includes a mixing chamber (1) and an enhanced separation chamber (2). The extractant and content of the high-gravity extraction machine are pass...

Example Embodiment

[0044] Example 2: Extraction and dephenolization of phenol-containing wastewater from coal chemical industry

[0045] according to figure 2 The process flow chart shown is to extract phenol from coal chemical wastewater containing phenol. The specific steps are as follows:

[0046] (1) The volume ratio of the extractant (methyl isobutyl ketone) and phenol-containing wastewater (total phenols 5750mg / L, polyphenols 1820mg / L, COD content 19340mg / L, pH value 8.0) are reversed. The direction is sent to a multi-stage extraction device with 3 high-gravity extractors in series for multi-stage countercurrent extraction (stage 3), and the final extraction phase (containing crude phenol and extractant) and the final raffinate phase (wastewater containing a small amount of extractant) are collected );

[0047] Each high-gravity extraction machine includes a mixing chamber (1) and an enhanced separation chamber (2). The extractant and content of the high-gravity extraction machine are passed f...

Example Embodiment

[0050] Example 3 Extraction and dephenolization of phenol-containing wastewater from coal chemical industry

[0051] according to figure 2 The process flow chart shown is to extract phenol from coal chemical wastewater containing phenol. The specific steps are as follows:

[0052] (1) The volume ratio of the extractant (methyl isobutyl ketone) and phenol-containing wastewater (total phenols 5750mg / L, polyphenols 1820mg / L, COD content 19340mg / L, pH value 7.0) are reversed. The direction is sent to the multi-stage extraction device with 7 high-gravity extractors in series for multi-stage countercurrent extraction (7 stages), and the final extraction phase (containing crude phenol and extractant) and the final raffinate phase (wastewater containing a small amount of extractant) are collected );

[0053] Each high-gravity extraction machine includes a mixing chamber (1) and an enhanced separation chamber (2). The extractant and content of the high-gravity extraction machine are passed...

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Abstract

The invention discloses a method for dephenolization of phenolic wastewater through multi-stage mixed intensified separation. The method comprises the following steps: (1) conveying an extraction agent and phenolic wastewater into a multi-stage extraction device consisting of a plurality of supergravity extractors in an opposite direction, performing multi-stage counter-current extraction, and collecting a final extraction phase and a final raffinate; and (2) feeding the final raffinate into a solvent recycling tower, performing solvent recycling I so as to obtain crude phenol and an extraction agent I; feeding the final raffinate into a solvent steam stripping tower, performing solvent recycling II so as to obtain wastewater after dephenolization and an extraction agent II; continuously introducing the extraction agent I and the extraction agent II into the multi-stage extraction device, and performing multi-stage counter-current extraction with the phenolic wastewater. By adopting an extraction process, two-phase separation is achieved through supergravity, and good phase separation properties and large treatment capacities can be achieved; by adopting a powerless spiral or eddy mixer, rapid mass transfer balance of two phases can be achieved, the mass transfer efficiency is high, and the stage efficiency is approximate to 100%.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for extracting and removing phenols from phenol-containing wastewater with multistage mixing and enhanced separation. Background technique [0002] Phenolic substances in wastewater are toxic to organisms and inhibit the growth of microorganisms, resulting in unstable and efficient operation of biochemical systems. However, as chemicals, phenols can be recycled. At present, the commonly used method for phenol-containing industrial wastewater is to remove phenolic substances by solvent extraction to improve the biodegradability of wastewater. Using the principle of similar compatibility, most of the phenolic substances enter the extraction phase and obtain crude phenolic products through rectification separation. The extractant is recycled, and the extractant left in the raffinate phase is stripped and recycled by the solvent stripper. At present, the extr...

Claims

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Application Information

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IPC IPC(8): C02F1/26B01D11/04C02F101/34
CPCB01D11/0488B01D11/0492C02F1/26C02F2101/345
Inventor 陈贵锋高明龙董卫果杜松王吉坤段锋付楚芮贾媛田陆峰王亚强
Owner CCTEG CHINA COAL RES INST
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