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Method for extracting phenol-containing wastewater based on hydrophobic eutectic solvent

A deep eutectic solvent and hydrophobic technology, which is applied in the fields of extraction water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of high temperature and long preparation time for extraction of phenol-containing wastewater at preparation temperature , long processing cycle and other issues, to achieve the effect of short preparation time, short extraction time and low temperature

Inactive Publication Date: 2020-01-10
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation temperature of this kind of deep eutectic solvent and the temperature of extracting phenol-containing wastewater are relatively high, and the preparation time of this deep eutectic solvent is relatively long, requiring high energy consumption and long treatment cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 A method for extracting phenol-containing wastewater based on a hydrophobic deep eutectic solvent:

[0021] Preparation of hydrophobic deep eutectic solvent: take 0.2mol menthol and place it in a vacuum drying oven at 80°C for 5 hours, then mix the dried menthol with 0.1mol myristic acid, and stir in an oil bath at 70°C After 10 minutes, a transparent and uniform hydrophobic deep eutectic solvent was obtained.

[0022] The guaiacol aqueous solution with a concentration of 17000 mg / L and the hydrophobic deep eutectic solvent prepared above were added into the container according to the mass ratio of 1:1, stirred vigorously at 40°C water bath temperature for 4 hours, and then stood to separate into The upper organic phase and the lower aqueous phase were allowed to stand for 24 hours to completely separate the organic-water two phases; the lower aqueous phase was analyzed by ultraviolet spectroscopy, and the removal rate of guaiacol was 93.6%.

Embodiment 2

[0023] Example 2 A method for extracting phenol-containing wastewater based on a hydrophobic deep eutectic solvent:

[0024] Preparation of hydrophobic deep eutectic solvent: take 0.2mol menthol and place it in a vacuum drying oven at 80°C for 5 h, then mix the dried menthol with 0.1mol myristic acid, and place in an oil bath at 70°C Stir for 10 min to obtain a transparent and uniform hydrophobic deep eutectic solvent.

[0025] The guaiacol aqueous solution with a concentration of 170 mg / L and the hydrophobic deep eutectic solvent prepared above were added into the round bottom flask according to the mass ratio of 1:1, vigorously stirred at 40 °C water bath temperature for 4 h, and then allowed to stand The stratification was divided into upper organic phase and lower aqueous phase, and the stratification time was 24 h to completely separate the organic-aqueous two phases; the lower aqueous phase was analyzed by ultraviolet spectrum, and the removal rate of guaiacol was 93.5%....

Embodiment 3

[0026] Example 3 A method for extracting phenol-containing wastewater based on a hydrophobic deep eutectic solvent:

[0027] Preparation of hydrophobic deep eutectic solvent: Take 0.2mol menthol and place it in a vacuum drying oven at 80°C for 5 h, then mix the dried menthol with 0.1mol myristic acid, and place in an oil bath at 70°C After stirring for 10 min, a transparent and uniform hydrophobic deep eutectic solvent was obtained.

[0028] The phenol aqueous solution with a concentration of 8000 mg / L and the hydrophobic deep eutectic solvent prepared above were added into the container according to the mass ratio of 1:1, stirred vigorously at 40 °C water bath temperature for 4 h, and then stood to separate into the upper organic layer. phase and the lower water phase, and the separation time was 24 h to completely separate the organic-water two phases; the lower water phase was analyzed by ultraviolet spectroscopy, and the removal rate of phenol was 94.1%.

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Abstract

The invention discloses a method for extracting phenolic wastewater based on a hydrophobic eutectic solvent. The hydrophobic eutectic solvent is used for extracting phenolic substances in wastewater,and the hydrophobic eutectic solvent comprises a hydrogen bond acceptor and a hydrogen bond donor, wherein the hydrogen bond acceptor is menthol, the hydrogen bond donor is at least one of tetradecanoic acid, hexadecanoic acid and octadecanoic acid, and a molar ratio of the hydrogen bond acceptor to the hydrogen bond donor is (1-2):1. The method for extracting phenolic pollutants in the phenolic wastewater by using the hydrophobic eutectic solvent has the advantages of simplicity in operation, short extraction time, realization of obvious interface and easy separation of an organic phase and awater phase during standing after extraction, and high removal efficiency of the phenolic pollutants.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for extracting phenol-containing wastewater based on a hydrophobic deep eutectic solvent. Background technique [0002] Phenolic compounds are protoplasmic poisons that can invade the human body through mucous membranes and skin. High concentrations of phenols can cause protein coagulation and cell inactivation, causing tissue damage and necrosis until systemic poisoning. [0003] Since the 1950s, the development of the chemical industry has led to an increase in the types of artificially synthesized organic substances. As an important product and raw material, phenolic compounds have been widely used, such as explosives, pesticides, medicines and dyes, etc. In addition, there will be a large amount of phenolic compounds discharged in coking plants, oil refineries, etc. Some concentrations are as high as tens of thousands of milligrams per liter, and some a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/26C02F101/34
CPCC02F1/26C02F2101/345
Inventor 于凤文丁磊王芳琪王骏李翱计建炳
Owner ZHEJIANG UNIV OF TECH
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