Upgrading of Wash Oil through Reduction of Nitrogen-Containing Compounds

As part of improving the quality of wash oil, the reduction of three kinds of nitrogen-containing compounds (NCs), including quinoline (QU), iso-quinoline (IQU), and indole (IN), found in wash oil was examined by liquid–liquid equilibrium extraction. The wash oil and an aqueous solution of formamide...

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Autor principal:	Su Jin Kim
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	coal tar wash oil nitrogen-containing compounds indole formamide equilibrium extraction Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/3d80740102d349af95af1c76d2bc5e30
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spelling	oai:doaj.org-article:3d80740102d349af95af1c76d2bc5e302021-11-25T18:49:55ZUpgrading of Wash Oil through Reduction of Nitrogen-Containing Compounds10.3390/pr91118692227-9717https://doaj.org/article/3d80740102d349af95af1c76d2bc5e302021-10-01T00:00:00Zhttps://www.mdpi.com/2227-9717/9/11/1869https://doaj.org/toc/2227-9717As part of improving the quality of wash oil, the reduction of three kinds of nitrogen-containing compounds (NCs), including quinoline (QU), iso-quinoline (IQU), and indole (IN), found in wash oil was examined by liquid–liquid equilibrium extraction. The wash oil and an aqueous solution of formamide were used as the raw material and the solvent, respectively. Increasing the volume fraction of water in the solvent in the initial state (y<sub>w,0</sub>) resulted in a decrease in the distribution coefficients of each NC, while inversely, the selectivity of each NC in reference to 2-methylnaphthalene increased. The selectivity ranges of QU, IQU and IN at y<sub>w,0</sub> = 0.05~0.3 were 19~57, 19~56 and 50~79, respectively. Through five stages of equilibrium extraction performed under the condition of y<sub>w,0</sub> = 0.05, the concentrations of QU and IQU contained in the raffinate oil recovered at the fifth stage were reduced by about 69% and 65% compared to those contained in the wash oil. The concentration of IN in particular, a useful compound in the chemical industry, which is a raw material for pharmaceuticals, dyes, and fragrances, was reduced by 93.4% through a five-stage extraction operation. The formamide extraction method of this study was highly efficient in reducing the NC present in the wash oil, showing the feasibility of this method.Su Jin KimMDPI AGarticlecoal tarwash oilnitrogen-containing compoundsindoleformamide equilibrium extractionChemical technologyTP1-1185ChemistryQD1-999ENProcesses, Vol 9, Iss 1869, p 1869 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	coal tar wash oil nitrogen-containing compounds indole formamide equilibrium extraction Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	coal tar wash oil nitrogen-containing compounds indole formamide equilibrium extraction Chemical technology TP1-1185 Chemistry QD1-999 Su Jin Kim Upgrading of Wash Oil through Reduction of Nitrogen-Containing Compounds
description	As part of improving the quality of wash oil, the reduction of three kinds of nitrogen-containing compounds (NCs), including quinoline (QU), iso-quinoline (IQU), and indole (IN), found in wash oil was examined by liquid–liquid equilibrium extraction. The wash oil and an aqueous solution of formamide were used as the raw material and the solvent, respectively. Increasing the volume fraction of water in the solvent in the initial state (y<sub>w,0</sub>) resulted in a decrease in the distribution coefficients of each NC, while inversely, the selectivity of each NC in reference to 2-methylnaphthalene increased. The selectivity ranges of QU, IQU and IN at y<sub>w,0</sub> = 0.05~0.3 were 19~57, 19~56 and 50~79, respectively. Through five stages of equilibrium extraction performed under the condition of y<sub>w,0</sub> = 0.05, the concentrations of QU and IQU contained in the raffinate oil recovered at the fifth stage were reduced by about 69% and 65% compared to those contained in the wash oil. The concentration of IN in particular, a useful compound in the chemical industry, which is a raw material for pharmaceuticals, dyes, and fragrances, was reduced by 93.4% through a five-stage extraction operation. The formamide extraction method of this study was highly efficient in reducing the NC present in the wash oil, showing the feasibility of this method.
format	article
author	Su Jin Kim
author_facet	Su Jin Kim
author_sort	Su Jin Kim
title	Upgrading of Wash Oil through Reduction of Nitrogen-Containing Compounds
title_short	Upgrading of Wash Oil through Reduction of Nitrogen-Containing Compounds
title_full	Upgrading of Wash Oil through Reduction of Nitrogen-Containing Compounds
title_fullStr	Upgrading of Wash Oil through Reduction of Nitrogen-Containing Compounds
title_full_unstemmed	Upgrading of Wash Oil through Reduction of Nitrogen-Containing Compounds
title_sort	upgrading of wash oil through reduction of nitrogen-containing compounds
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/3d80740102d349af95af1c76d2bc5e30
work_keys_str_mv	AT sujinkim upgradingofwashoilthroughreductionofnitrogencontainingcompounds
_version_	1718410641657561088

Upgrading of Wash Oil through Reduction of Nitrogen-Containing Compounds

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