The new liquid–liquid extraction method for separation of phenolic compounds from coal tar

Isolation of phenols from the middle oil fraction(170-230°C) of tar produced in the multi-cogeneration system has been investigated for the purpose of recovering valuable pure phenols, such as phenol, cresols, xylenol and ethyl-phenol. Phenolic compounds were separated from the middle oil by liquid-liquid extraction using alkali and sulfuric acid. The yield of phenolic fraction from the middle oil (170-230°C) is up to 37%, which is much higher compared with those of metallurgical coke plants. Chromatography-mass spectrometry was used to analyse phenolic compounds. The result shows that the phenol content is less than 2%, and main compounds are cresol(14%), xylenol(20%) . Phenols of the middle oil fraction(230-280°C) was also analysed, which main contain methyl naphthol(20%).

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Efficient separation of phenols from coal tar with aqueous solution of amines by liquid-liquid extraction

Chinese Journal of Chemical Engineering ◽

10.1016/j.cjche.2021.01.008 ◽

2021 ◽

Author(s):

Yonglin Li ◽

He'an Luo ◽

Qiuhong Ai ◽

Kuiyi You ◽

Wenlong Xiao

Keyword(s):

Aqueous Solution ◽

Coal Tar ◽

Liquid Extraction ◽

Efficient Separation ◽

Liquid Liquid Extraction

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Development of a rotatory and continuous liquid–liquid extraction technique for phenolic compounds in wine

The Analyst ◽

10.1039/an9962100297 ◽

1996 ◽

Vol 121 (3) ◽

pp. 297-302 ◽

Cited By ~ 10

Author(s):

E. R. Brú ◽

C. G. Barroso ◽

R. Cela ◽

J. A. Pérez-Bustamante

Keyword(s):

Phenolic Compounds ◽

Liquid Extraction ◽

Extraction Technique ◽

Liquid Liquid Extraction

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Homogeneous Liquid-Liquid Extraction Method for Selective Separation and Preconcentration of Trace Amounts of Palladium

E-Journal of Chemistry ◽

10.1155/2009/564276 ◽

2009 ◽

Vol 6 (4) ◽

pp. 1077-1084 ◽

Cited By ~ 5

Author(s):

Mohammad Reza Jamali ◽

Yaghoub Assadi ◽

Reyhaneh Rahnama Kozani ◽

Farzaneh Shemirani

Keyword(s):

Extraction Method ◽

Limit Of Detection ◽

Liquid Extraction ◽

Selective Separation ◽

Complexing Agent ◽

Homogeneous Liquid ◽

Liquid Liquid Extraction ◽

Relative Standard ◽

Separation And Preconcentration ◽

Ternary Component System

A simple and effective homogeneous liquid-liquid extraction method for selective separation, preconcentration and spectrophotometric determination of palladium(II) ion was developed by using a ternary component system (water / tetrabutylammonium ion (TBA+) / chloroform). The phase separation phenomenon occurred by an ion–pair formation of TBA+and perchlorate ion. Thio-Michler’s ketone (TMK), 4, 4ˊ-bis (dimethylamino) thiobenzophenone, was used as a complexing agent. After optimization of complexation and extraction conditions ([TMK]=5.0x10-2mol L-1, [TBA+] = 2.0×10-2mol L-1, [CHCl3] = 60.0 µL, [ClO4-] = 2.5×10-2mol L-1and pH= 3.0), a preconcentration factor 10 was obtained for 10 mL of sample. The analytical curve was linear in the range of 2-100 ng mL-1and the limit of detection was 0.4 ng mL-1. The relative standard deviation was 3.2% (n=10). Accuracy and application of the method was estimated by using test samples of natural and synthetic water spiked with different amounts of palladium(II) ion. The method is very simple and inexpensive.

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Recovery and Elimination of Phenolic Pollutants from Water Using [NTf2] and [Nf2]-Based Ionic Liquids

Applied Sciences ◽

10.3390/app9204321 ◽

2019 ◽

Vol 9 (20) ◽

pp. 4321

Author(s):

Sas ◽

Domínguez ◽

González

Keyword(s):

Ionic Liquids ◽

Phenolic Compounds ◽

Extraction Yield ◽

Liquid Extraction ◽

Industrial Growth ◽

Extraction Solvent ◽

Phenolic Pollutants ◽

Liquid Liquid Extraction ◽

Volatile Organic ◽

Extraction Solvents

At present, pollution is one of the most important problems worldwide. Industrial growth makes it necessary to develop techniques to remove pollutant substances from water, since water is an important natural source for life. One of these techniques is liquid–liquid extraction, which is used to remove phenolic compounds from wastewaters. Volatile organic compounds are used as common extraction solvents in liquid–liquid extractions; nevertheless, some of their properties, such as toxicity and volatility, make it necessary to replace them with other less toxic solvents. In this work, the capability of four ionic liquids, based on bis(trifluoromethylsulfonyl)imide [NTf2] and bis(fluorosulfonyl)imide [Nf2] anions and different cations to remove phenolic compounds from water was studied. The phenolic compounds used in this study were phenol, o-cresol, and 2-chlorophenol, and the effects of the extraction solvent and phenol structures were analyzed. For that, a liquid–liquid extraction was carried out, and the extraction yield was determined. In general, high extraction efficiencies were obtained for all studied systems, obtaining the highest extraction efficiencies using the pyrrolidinium cation-based ionic liquids.

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