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Method for separating phenols compounds from phenol-containing waste water

A technology for phenolic compounds and phenolic wastewater, which is applied in the preparation of organic compounds, chemical instruments and methods, and water pollutants, etc., can solve the problems of loss of ionic liquids, the inability of large-scale industrial application in the extraction process, and the entry of ionic liquids. The effect of improving extraction

Inactive Publication Date: 2008-07-02
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the biggest difficulty in using ionic liquids to extract organic matter from aqueous solutions is the loss of ionic liquids. No matter how small the solubility of ionic liquids in water is, the extraction process will cause a part of ionic liquids to enter the water phase. Due to the high price of ionic liquids and their Unknown toxicity to the environment makes the extraction process currently unsuitable for large-scale industrial application
[0006] Therefore, in the present invention, the method for extracting phenolic compounds in phenol-containing wastewater has been studied using amide ionic liquids as an extractant. This is a green chemical technology, which has not been reported yet.

Method used

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  • Method for separating phenols compounds from phenol-containing waste water
  • Method for separating phenols compounds from phenol-containing waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 30 milliliters of waste water (0.5 mg / mL) containing phenolic compounds and 15 milligrams of 1-methyl-3-propionamidoimidazolium hexafluorophosphate in a 50 milliliter reaction bottle, at pH=5 and 15°C Stir on a magnetic stirrer for 30 minutes, then separate the organic phase from the water phase, analyze the phenol content in the water phase after extraction by gas chromatography, calculate the concentration of phenol in the organic phase after extraction by subtraction method 0.11mg / mL, the extraction rate was 22%.

Embodiment 2

[0023] Put 30 milliliters of waste water (0.5 mg / mL) containing phenolic compounds and 30 milligrams of 1-methyl-3-propionamidoimidazolium hexafluorophosphate in a 50 milliliter reaction bottle, at pH=5 and 150°C Stir on a magnetic stirrer for 1 hour, then separate the organic phase from the water phase, analyze the phenol content in the water phase after extraction by gas chromatography, calculate the concentration of phenol in the organic phase after extraction by subtraction method 0.22mg / mL, the extraction rate was 44%.

Embodiment 3

[0025] 30 milliliters of waste water (0.5 mg / mL) containing phenolic compounds, 30 milligrams of 1-acetamido-3-hexanamidoimidazole hexafluorophosphate, were placed in a 50 milliliter reaction bottle, and the mixture was mixed at pH=9 and 50° C. Under the following conditions, stir on a magnetic stirrer for 50 hours, then separate the organic phase from the water phase, analyze the phenol content in the water phase after extraction by gas chromatography, calculate the concentration of phenol in the organic phase after extraction by subtraction method to 0.41mg / mL, extract The rate is 82%.

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Abstract

The invention discloses a method for extracting phenolic compound from the waste water containing phenol. The method adopts ionic liquid of hydroxyanilides as extracting agent; the hydroxyanilides ionic liquid shows as formula (I). In the formula, R<1>, R<2> are respectively C1-C10 of amide group or C1-C10 of alkyl; L<-> is one of BF4<->, PF6<->, OAC<->, CF3SO3<->, N (SO2CF3) 2<->. The phenolic compound is phenol and / or substituted phenol; the substituent of the substituted phenol can be halogen, hydroxyl, methyl, ethyl, formylphenyl, carboxyl, etc. The invention adopts ionic liquid of hydroxyanilides as the extracting agent for extracting phenolic compound from waste water, so as to improve extraction effect, the ion liquid can be recycled; therefore, the invention is safe and stable and causes no pollution to environment; the invention is an practical environment friendly technology.

Description

technical field [0001] The invention relates to a method for extracting phenolic compounds from phenolic waste water with amide ionic liquid as an extractant. Background technique [0002] In recent years, my country's chemical industry has developed rapidly, but the industrial wastewater has brought serious impact and great harm to the environment on which we live. The intake of a certain amount of phenolic wastewater by the human body will cause different degrees of damage to the human body. Therefore, the remediation of phenolic wastewater is an important research content. Liquid-liquid extraction separation is an effective separation method with a wide range of applications. The solvent that this method adopts is generally commonly used benzene, light oil, butyl acetate, methyl isobutyl ketone, isopropyl ether, tributyl phosphate, N, N-di(1 methylheptyl) acetamide and other extractants. However, ketone solvents have high water solubility, tributyl phosphate is easy to...

Claims

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Application Information

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IPC IPC(8): C07C37/72C07C39/04C02F1/26C02F101/34
Inventor 裴文计建炳姬登祥斯小阳
Owner ZHEJIANG UNIV OF TECH