Low-loss high-efficiency dephenolizing extractant for treating low-rank coal quality-divided conversion phenol-containing wastewater

A technology for dephenolizing extractant and phenol wastewater, which is applied in solvent extraction, extraction water/sewage treatment, liquid solution solvent extraction, etc., can solve the problems of unsatisfactory dephenolization effect of extractant, complex extraction process, secondary pollution, etc. To achieve the effect of shortening the phase equilibrium time, high extraction efficiency and small loss

Active Publication Date: 2021-04-06
ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the problems of complex extraction process, unsatisfactory dephenolization effect of the extractant, high price, large loss and easy to cause secondary pollution when the existing e

Method used

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  • Low-loss high-efficiency dephenolizing extractant for treating low-rank coal quality-divided conversion phenol-containing wastewater
  • Low-loss high-efficiency dephenolizing extractant for treating low-rank coal quality-divided conversion phenol-containing wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Extractant 1 is composed of dioctyl phosphate and kerosene, wherein the volume ratio of dioctyl phosphate to kerosene is 1:3.

Embodiment 2

[0041] The extractant 2 is composed of dioctyl phosphate, kerosene, and trialkylamine, wherein the volume ratio of dioctyl phosphate to kerosene is 1:3.5, the volume ratio of dioctyl phosphate to trialkylamine is 1:0.3, and the volume ratio of kerosene to kerosene is 1:0.3. The volume ratio of trialkylamine is 1:0.06.

Embodiment 3

[0043] The extractant 3 is composed of dioctyl phosphate, kerosene, trialkylamine and isomeric β-branched primary alcohol, wherein the volume ratio of dioctyl phosphate to isomeric β-branched primary alcohol is 1:0.1, diphosphoric acid The volume ratio of octyl ester to kerosene is 1:3.5, the volume ratio of dioctyl phosphate to trialkylamine is 1:0.4, the volume ratio of kerosene to trialkylamine is 1:0.1, and the volume ratio of kerosene to isomerized β-branched primary alcohol The volume ratio is 1:0.03, and the volume ratio of trialkylamine and isomeric β-branched primary alcohol is 1:0.25.

[0044] (2) Use of extractant

[0045] 1) Wastewater pretreatment

[0046] Use concentrated sulfuric acid to adjust the pH of low-rank coal fractionation to phenol-containing wastewater to 1.5, break the emulsion to remove oil and suspended matter, and take the supernatant after static precipitation.

[0047] The concentrations of volatile phenols, total phenols, and TOC in the pretr...

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Abstract

The invention discloses a low-loss high-efficiency dephenolizing extractant for treating low-rank coal quality-divided conversion phenol-containing wastewater. The extractant is composed of dioctyl phosphate, kerosene, trialkylamine and isomeric beta-branched chain primary alcohol. The use method of the extractant comprises the following steps: at normal temperature, regulating the pH value of the wastewater generated by low-rank coal quality-divided conversion to 1-6 by using acid, demulsifying to remove emulsified oil and suspended matters, adding the extractant provided by the invention, extracting to obtain an extraction phase (extractant) and a raffinate phase (extracted wastewater), treating the extraction phase by using alkali liquor to obtain a regenerated extractant, and recycling. The product effectively solves the problems of high equipment investment, complex operation, high operation cost and the like caused by complex extraction process, low dephenolization efficiency and large loss of the extractant in the existing extractant.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and relates to a low-loss and high-efficiency dephenol-removing extractant for treating low-rank coal fractionation and conversion of phenol-containing wastewater. Background technique [0002] The quality conversion process of low-rank coal is affected by many factors such as coal quality, furnace type (internal heat, external heat) and furnace temperature. Due to sufficient pyrolysis and other reasons, the waste water pollutant content is very high, especially phenolic substances. The total phenols are generally 3500-12000mg / L. The impact of the sewage treatment system is very large. Therefore, it is necessary to increase the pretreatment measures to improve the biodegradability of the wastewater and ensure the stable operation of the subsequent sewage treatment facilities. [0003] At present, solvent extraction is mainly used for the treatment or recovery of phenolic wastewater. Commonly used...

Claims

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Application Information

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IPC IPC(8): C02F1/26B01D11/04C02F101/34
CPCC02F1/26B01D11/0492C02F2101/345
Inventor 于永辉门枢孙承林王勇卫皇曌李泽峰王凯
Owner ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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