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A compound extractant for extracting dihydric phenols and its preparation method and application

A composite extractant and dihydric phenol technology, applied in chemical instruments and methods, extraction water/sewage treatment, water pollutants, etc., can solve the problems of secondary pollution, high solubility and high energy consumption, and achieve improved treatment effect, Widen the range of options, avoid losses and the effect of secondary pollution

Active Publication Date: 2020-07-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the problems existing in the prior art, one of the purposes of the present invention is to use existing extractants such as diisopropyl ether and MIBK to extract and remove phenols when dealing with wastewater with high phenolic substance content in the prior art. Poor, solubility is big and the shortcoming of high energy consumption, provide a kind of extraction agent that handles dihydric phenol in phenolic wastewater, described extractant can avoid secondary pollution in wastewater, the removal rate of dihydric phenolic substance in phenolic wastewater is greater than 99%, creating favorable conditions for subsequent biochemical treatment

Method used

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  • A compound extractant for extracting dihydric phenols and its preparation method and application
  • A compound extractant for extracting dihydric phenols and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The extractant used for treating dihydric phenol in phenol-containing wastewater contains the following components by volume fraction: 70% of sec-octylone, 20% of ethyl acetate, and 10% of n-butanol. The prepared extractant and the prepared simulated wastewater were mixed at a volume ratio of 1:1 for 15 minutes, and then left to stand for 30 minutes to obtain the extract phase and the raffinate phase.

[0048] After testing, the content of phenol in the raffinate phase of gained is respectively: phenol is 259.2mg / L, and catechol is 97.5mg / L, and resorcinol is 89.2mg / L, and hydroquinone is 145.7mg / L. From this, it can be calculated that the wastewater containing phenol can be removed by one extraction: 93.52% for phenol, 90.25% for catechol, 91.08% for resorcinol, and 85.43% for hydroquinone.

Embodiment 2

[0050] The extractant used for treating dihydric phenol in phenol-containing wastewater contains the following components by volume fraction: 75% of sec-octylone, 15% of ethyl acetate, and 10% of n-butanol. The prepared extractant and the prepared simulated wastewater were mixed at a volume ratio of 1:1 for 15 minutes, and then left to stand for 30 minutes to obtain the extract phase and the raffinate phase.

[0051] After testing, the content of phenol in the raffinate phase of the gained is respectively: phenol is 237.6mg / L, catechol is 94.3mg / L, resorcinol is 81.0mg / L, hydroquinone is 136.9mg / L. From this, it can be calculated that the wastewater containing phenol can be removed by one extraction: 94.06% for phenol, 90.57% for catechol, 91.90% for resorcinol, and 86.31% for hydroquinone.

Embodiment 3

[0053] The extractant used for treating dihydric phenol in phenol-containing wastewater contains the following components by volume fraction: 80% of sec-octyl ketone, 15% of ethyl acetate, and 5% of n-butanol. The prepared extractant and the prepared simulated wastewater were mixed at a volume ratio of 1:1 for 15 minutes, and then left to stand for 30 minutes to obtain the extract phase and the raffinate phase.

[0054] After testing, the content of phenol in the raffinate phase of gained is respectively: phenol is 220mg / L, and catechol is 86.8mg / L, and resorcinol is 74.2mg / L, and hydroquinone is 115.8mg / L. From this, it can be calculated that the wastewater containing phenol can be removed by one extraction: 94.5% for phenol, 91.32% for catechol, 92.58% for resorcinol, and 88.42% for hydroquinone.

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Abstract

The invention relates to a compound extraction agent for extracting a diphenol substance as well as a preparation method and application thereof. The diphenol substance comprises any one or a combination of at least two of pyrocatechol or derivatives thereof, resorcinol or derivatives thereof and hydroquinone or derivatives thereof. The compound extraction agent is prepared from the following components in parts by volume: 70 to 90 parts of ketones solvent, 10 to 20 parts of esters solvent and 0 to 20 parts of alcohols solvent. The problem that the traditional extraction agent is poor in diphenol substance removal efficiency is solved, the removal rate of the diphenol substance of the compound extraction agent at least can reach 99%, an excellent distribution coefficient is realized on element phenol, and the phenolic wastewater treatment effect is obviously improved; a solvent recovery stage is more energy-saving; water-insoluble solvents are adopted, so that loss and secondary pollution caused by the solvents in an extracting stage can be avoided.

Description

technical field [0001] The invention relates to the technical field of water treatment and resource utilization, in particular to a composite extractant for extracting dihydric phenolic substances and its preparation method and application. Background technique [0002] Phenol-containing wastewater is industrial wastewater produced during coking, gas purification, and chemical product refining. It mainly contains volatile phenols, polycyclic aromatic hydrocarbons, and heterocyclic solvents such as oxygen, sulfur, and nitrogen. It is a kind of high COD, high phenol value, and high ammonia nitrogen. And it is difficult to treat industrial organic wastewater. The water quality of this type of wastewater varies greatly, the composition is complex, and biodegradation is difficult. The organic matter with a high content is phenolic substances, including unit phenols and polyphenols. Domestically, pretreatment to remove oil, air stripping to remove ammonia, extraction to remove ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26C02F101/34
CPCC02F1/26C02F2101/345C02F2103/12C02F2103/28C02F2103/30C02F2103/365C02F2103/38
Inventor 宁朋歌刘文昭李玉平曹宏斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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