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A kind of extraction agent and extraction method with high partition coefficient for polyphenols in phenolic wastewater

A technology of distribution coefficient and extraction agent, which is applied in chemical instruments and methods, extraction of water/sewage treatment, water pollutants, etc., can solve the problem of low polyphenol distribution coefficient, failure to achieve node control indicators, and difficulty in stable operation of biochemical treatment processes, etc. problem, to achieve the effect of wide ratio range, easy control and good extraction effect

Active Publication Date: 2020-11-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extraction effect of methyl isobutyl ketone on phenol is better than that of diisopropyl ether, but its distribution coefficient for highly toxic polyphenols is still low, making it difficult for the biochemical treatment process to run smoothly and fail to reach the node of the subsequent near-zero emission process control index

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] According to the volume ratio, 50% methyl n-propyl ketone and 50% tert-amyl alcohol are formulated into a composite extractant; the total phenol content is 3000 mg / L, wherein the unit phenol content is 1400 mg / L, and the polyphenol content is 1600 mg / L of phenol-containing wastewater is controlled at 25°C, and the pH value is adjusted to 7; then, the above-mentioned composite extractant and phenol-containing wastewater are subjected to two-stage countercurrent extraction in two separatory funnels at a volume ratio of 1:5, wherein Mix for 30 minutes and let stand for 15 minutes to obtain the extract phase and the raffinate phase.

[0031] The content of total phenols in the raffinate phase was detected to be 108 mg / L, wherein the contents of unit phenols and polyphenols were 18 mg / L and 90 mg / L respectively.

Embodiment 2

[0033] 60% methyl n-propyl ketone and 40% tert-amyl alcohol are formulated into a composite extractant by volume ratio; the total phenol content is 15000mg / L, wherein the unit phenol content is 7000mg / L, and the polyphenol content is 8000mg The temperature of phenol-containing wastewater per L was controlled at 25°C, and the pH value was adjusted to 7; then, the above-mentioned composite extractant and phenol-containing wastewater were subjected to three-stage countercurrent extraction in three separatory funnels at a volume ratio of 1:4, wherein Mix for 30 minutes and let stand for 15 minutes to obtain the extract phase and the raffinate phase.

[0034] The content of total phenols in the raffinate phase was detected to be 56 mg / L, wherein the contents of unit phenols and polyphenols were 8 mg / L and 48 mg / L, respectively.

Embodiment 3

[0036] According to the volume ratio, 70% methyl n-propyl ketone and 30% tert-amyl alcohol are formulated into a composite extractant; the total phenol content is 15000mg / L, wherein the unit phenol content is 7000mg / L, and the polyphenol content is 8000mg The temperature of the phenol-containing wastewater per L is controlled at 25°C, and the pH value is adjusted to 7; then, the above-mentioned composite extractant and phenol-containing wastewater are subjected to three-stage countercurrent extraction in three separating funnels at a volume ratio of 1:5, wherein Mix for 30 minutes and let stand for 15 minutes to obtain the extract phase and the raffinate phase.

[0037] The content of total phenols in the raffinate phase was detected to be 64 mg / L, and the contents of unit phenols and polyphenols were 10 mg / L and 54 mg / L respectively.

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Abstract

The invention belongs to the technical field of sewage treatment and discloses an extractant with high distribution coefficient for polyhydric phenol in phenolic wastewater and an extraction method. The method comprises the following steps: using 30-99% by volume of methyl n-propyl ketone as a main extractant and 1-70% by volume of tert-amyl alcohol as a synergistic extractant to obtain a composite extractant; and carrying out multi-stage counter-current extraction on phenolic wastewater by the use of the composite extractant so as to obtain an extract phase and a raffinate. Removal efficiencyof polyhydric phenol in phenolic wastewater by the composite extractant is greatly raised, and the composite extractant has low boiling point and low recycling energy consumption. The composite extractant has wide range of volume ratio, is simple for industrial operation, and has a good prospect in actual industrial application.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an extraction agent and an extraction method with a high distribution coefficient for polyphenols in phenol-containing wastewater. Background technique [0002] A large amount of phenol-containing wastewater produced in the cooling and washing processes of the fixed-bed coal gasification process has strong toxicity and high content of unit phenols and polyphenols, which is not only difficult to biochemically treat, but also inhibits biological activity. The current main method for the treatment of phenolic wastewater is extraction. The acid gas and ammonia are removed first, the pH of the wastewater is reduced to 7-8, and then solvent extraction is carried out. The extractants used in industrially successful devices include diisopropyl ether and methyl isobutyl ketone. The extraction effect of methyl isobutyl ketone on phenol is better than that of diisoprop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26C02F101/34
Inventor 杨思宇张银双谭扬通
Owner SOUTH CHINA UNIV OF TECH
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