Method for extracting and enriching aromatic compounds in water by double water-phase

An extraction, enrichment, and aromatic technology, which is used in extraction water/sewage treatment, liquid solution solvent extraction, etc., can solve the problems of complex process, low recovery rate and high cost, and achieve improved extraction rate, energy saving and working conditions. mild effect

Inactive Publication Date: 2009-07-29
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of high separation difficulty, low recovery rate, complicated process and high cost in the enrichment and recovery of aromatic compounds in the existing wastewater, and propose to use ionic liquid-salt two-phase system to extract aromatic compounds in wastewater craft

Method used

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  • Method for extracting and enriching aromatic compounds in water by double water-phase
  • Method for extracting and enriching aromatic compounds in water by double water-phase
  • Method for extracting and enriching aromatic compounds in water by double water-phase

Examples

Experimental program
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Embodiment 1

[0025] (1) Take 5 parts of 500 μg / mL phenol aqueous solution and 2 mL phenol aqueous solution, and add 1.51 g of ionic liquid [C 4 mime + ]Cl; add 0.69g, 0.83g, 0.97g, 1.10g and 1.24g K to the above liquid respectively 2 CO 3 Solids, mix them uniformly respectively, let stand to separate phases separately, the two-phase aqueous system is [C 4 mime + ]Cl-K 2 CO 3 system, the aromatic compounds were enriched in the ionic liquid phase of the upper phase, and an enrichment extraction was performed. Calculate the extraction rate according to formula 1, the result is as follows figure 1 shown.

[0026] (2) Take the ionic liquid phase liquid, and use a rotary evaporator to evaporate the aromatic compound, and the ionic liquid is recovered and recycled;

[0027] In order to improve the extraction rate of aromatic compounds, a secondary extraction is used to enrich the aromatic compounds in the aqueous solution. Then take steps (3) and (4):

[0028] (3) The aqueous solution o...

Embodiment 2

[0032] According to the method of Example 1, except that the 500 μg / mL aniline aqueous solution was used, an enrichment extraction was performed. Calculate the extraction rate according to formula 1, the result is as follows figure 1 shown.

Embodiment 3

[0034] According to the method of Example 1, but taking 500 μg / mL nitrobenzene aqueous solution, one enrichment extraction was performed. Calculate the extraction rate according to formula 1, the result is as follows figure 1 shown.

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Abstract

The invention relates to a method for two-phase extraction and enrichment of aromatic compounds in water. A hydrophilic ionic liquid-salt two-phase system is used to extract and recover aromatic compounds in aqueous solution to achieve the purpose of enriching and recovering aromatic compounds from wastewater. The extracted ionic liquid phase can recover aromatic compounds by distillation or vacuum distillation, and the ionic liquid can be enriched and recovered by adding salt for recycling. For general compounds such as p-nitrophenol or phenol, the extraction rate can reach more than 75% after one enrichment, and for some compounds such as nitrobenzene, the extraction rate can reach 90% after one enrichment.

Description

technical field [0001] The invention relates to a method for two-phase extraction and enrichment of aromatic compounds in water. Background technique [0002] Aromatic compounds are important raw materials and organic solvents for organic synthesis, but they are also a class of pollutants that are extremely harmful to the environment. They have a certain degree of volatility, exist for a long time, and are difficult to degrade; they are insoluble or slightly soluble in water, and are not easy to be decomposed; they are not easy to degrade in the environment, and they last for a long time. They can affect regions and countries through the atmosphere and water. In the global environment, it is easy to accumulate and stay in organisms, and generally has good fat solubility, leading to canceration, distortion and feminization of humans and animals. It is difficult to deal with with existing environmental technologies, thus causing long-term harm. Aromatic compounds in the envir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26B01D11/04
Inventor 陈继张冬丽邓岳锋
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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