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Efficient dephenolizing extractant and extraction and dephenolization method thereof

An extraction agent and extraction technology, applied in chemical instruments and methods, extraction water/sewage treatment, water pollutants, etc., can solve the problems of low extraction rate of refractory phenols, large back extraction loss, high price, etc. Layer time, the effect of reducing extraction cost

Inactive Publication Date: 2018-05-18
CCTEG CHINA COAL RES INST
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  • Claims
  • Application Information

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Problems solved by technology

The extraction agent has the problems of complicated preparation process, complicated extraction and back-extraction process, low extraction rate of refractory phenols and large back-extraction loss
[0006] (3) In the high-concentration phenol ammonia wastewater treatment method disclosed by CN103496812A, CN103496757A, CN103466873A, and CN103466874A, n-butyl acetate is used as the extraction agent, and the extraction agent has the problems of low extraction rate of refractory phenol and high energy consumption of back extraction
[0007] (4) The extraction agent used in the method for dephenolizing coal chemical industry wastewater disclosed in CN104276618A is composed of sec-butyl acetate, phenetole and crown ether compounds. The extraction agent has the problems of high price and serious extraction loss

Method used

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  • Efficient dephenolizing extractant and extraction and dephenolization method thereof
  • Efficient dephenolizing extractant and extraction and dephenolization method thereof
  • Efficient dephenolizing extractant and extraction and dephenolization method thereof

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Experimental program
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Effect test

Embodiment 1

[0045] Embodiment 1: the removal effect investigation of different extractants

[0046] The extraction conditions are as follows: pH value is 6, temperature is 25°C, ratio (that is, the volume ratio of extractant to waste water, the same below) is 1:1, and the extraction time is 15 minutes.

[0047] Extractant 1: tricresyl phosphate;

[0048] Extractant 2: a mixed extractant of tricresyl phosphate + diesel oil (the volume ratio of tricresyl phosphate to diesel is 1:1);

[0049] Extractant 3: a mixed extractant of tricresyl phosphate + kerosene (the volume ratio of tricresyl phosphate to kerosene is 1:1);

[0050] Extractant 4: a mixed extractant of tricresyl phosphate + kerosene + trioctylamine (the volume ratio of tricresyl phosphate, kerosene and trioctylamine is 1:3:0.5);

[0051] Wherein, the preparation method of extractant 4 is to add tricresyl phosphate into kerosene, stir fully, dissolve and mix uniformly, then add trioctylamine, and stir again uniformly, thereby obt...

Embodiment 2

[0056] Embodiment 2: The removal effect investigation of different amine extractants

[0057] The present embodiment was carried out according to the same method as in the above-mentioned embodiment 1, and the only difference is that the "trioctylamine" in the extractant 4 is respectively tripropylamine and tetraethylammonium chloride in equal amounts, that is, the following corresponding relation:

[0058] Extractant 5: tricresyl phosphate + kerosene + tripropylamine

[0059] Extractant 6: tricresyl phosphate + kerosene + tetramethylammonium chloride

[0060] Extractant 7: tricresyl phosphate + kerosene + tetraethylammonium chloride

[0061] The contents of volatile phenols, low-volatile phenols and total phenols in the wastewater after extraction treatment were measured and the corresponding extraction rates were calculated and listed in Table 3.

[0062] Table 3. Various phenol contents and extraction rates after treatment

[0063]

[0064] As can be seen from Table ...

Embodiment 3

[0065] Embodiment 3: the investigation of tricresyl phosphate and kerosene dosage ratio in extractant 3

[0066] Use extraction agent 3, carry out this embodiment according to the same method of above-mentioned embodiment 1, difference is only to change the volume ratio of tricresyl phosphate and kerosene, specific volume ratio and the volatile phenol in the waste water after treatment, difficult volatile phenol And the content of total phenols is measured and the corresponding extraction rate is calculated and listed in Table 4.

[0067] Table 4. Various phenol contents and extraction rates after treatment

[0068]

[0069] It can be seen from Table 4 that when the extractant is a mixture of tricresyl phosphate and kerosene, the volume ratio of the two has a significant impact on the removal effect, and the volume ratio is preferably 1:1-1:3. When exceeding this range When, all will cause extraction rate to have significant reduction, find that the most preferably is 1:3 ...

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Abstract

The invention discloses an efficient dephenolizing extractant and an extraction and dephenolization method thereof. The extractant contains tricresyl phosphate as an active ingredient and further contains coal oil and amino compounds. A mixture of tricresyl phosphate, coal oil and the amino compounds is taken as the extractant. The complex extraction and dephenolization method adopts a special complex extraction mechanism, distribution coefficient is relatively high, extraction capacity is high, besides, the complex extractant has the advantage of being reusable after reextraction by alkali liquor, and the alkali liquor enriches, separates and recovers valuable substances in waste water, so that efficient treatment and resource recycling of phenols are realized.

Description

technical field [0001] The invention belongs to the field of coal chemical wastewater treatment, and relates to a high-efficiency dephenol extraction agent and an extraction and dephenol extraction method. Background technique [0002] With the large-scale development of my country's coal chemical industry, a large amount of toxic and harmful phenolic wastewater with high concentration and difficult to degrade has been produced. The wastewater has complex water quality and contains high concentrations of phenols, ammonia nitrogen, petroleum, cyanide, SS and heterocyclic compounds. Wait. Phenolic substances in wastewater are toxic to organisms and inhibit the growth of microorganisms, resulting in unstable and efficient operation of biochemical systems. However, as chemicals, phenols can be recycled. At present, the common method of phenol-containing industrial wastewater is to remove phenolic substances by solvent extraction to improve the biodegradability of wastewater. Usi...

Claims

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Application Information

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IPC IPC(8): C02F1/26C02F101/34
CPCC02F1/26C02F2101/345
Inventor 高明龙泡利鲍曼陈贵锋董卫果王吉坤付楚芮段锋杜松王亚强田陆峰姚汝强张深郑陈晨
Owner CCTEG CHINA COAL RES INST
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