Solvent extraction study of a whole, low‐temperature tar

Ahmed, Madiha; Vahrman, M.

doi:10.1002/jctb.5010160401

Cited by 4 publications

(1 citation statement)

References 4 publications

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“…In fact, the molecular compositions of neutral heteroatom compunds in coal tar have not been thoroughly defined. Although infrared (IR) spectroscopy , and nuclear magnetic resonance (NMR) were used to analyze LTCT, they were inadequate to show the molecular compositions of neutral heteroatom compounds. Other analytical tools, such as gas chromatography (GC) ,, and GC–mass spectroscopy (GC–MS) , could provide molecular composition information, but the chromatographic peaks of various compounds overlapped because of the complexity and structural similarity of the components in coal tar.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Middle-Temperature Gasification Coal Tar. Part 2: Neutral Fraction by Extrography Followed by Gas Chromatography–Mass Spectrometry and Electrospray Ionization Coupled with Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

et al. 2012

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A commercial lignite gasification-derived middle-temperature coal tar (MTCT) was subjected to acid−base extraction to obtain acidic, basic, and neutral fractions. The neutral fraction was characterized by mass spectrometry (MS) for hydrocarbon-group-type analysis and further fractionated by extrography into six subfractions, which were characterized by gas chromatography−mass spectrometry (GC−MS). Saturate, aromatic, and resin fractions of the neutral fraction accounted for 16.4, 47.6, and 36.0 wt %, respectively. The GC−MS analysis showed that the first neutral subfraction (15.7 wt %) contained alkanes, alkenes, and cycloalkanes; the second subfraction (52.0 wt %) contained 1−6-ring aromatics; the third subfraction (4.6 wt %) contained neutral nitrogen compounds, such as indoles, carbazoles, and benzocarbazoles; the fourth subfraction (8.2 wt %) contained neutral polar compounds, such as C 8 −C 28 alkyl nitriles and aliphatic and aromatic ketones, such as 4-, 5-, and 6-ketones and phenyl ketones, derived from a series of propiophenone to decanophenone; the fifth subfraction (14.9 wt %) contained 2-ketones and aromatic ketones, such as acetophenones, indanones, and acetonaphthones; and most of the sixth subfraction (1.3 wt %) cannot be eluted from GC. Electrospray ionization (ESI) coupled with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) was used to analyze the third neutral subfraction, which was enriched with neutral nitrogen compounds. In addition to indoles, carbazoles, and benzocarbazoles, FT-ICR MS analysis showed that dibenzocarbazoles and tribenzocarbazoles with various carbon numbers were present in the third neutral subfraction.

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Section: Introductionmentioning

confidence: 99%

Characterization of Middle-Temperature Gasification Coal Tar. Part 2: Neutral Fraction by Extrography Followed by Gas Chromatography–Mass Spectrometry and Electrospray Ionization Coupled with Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

et al. 2012

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Aliphatic hydrocarbons in a low‐temperature tar

Spence

Vahrman

1967

J. Appl. Chem.

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The total aliphatic hydrocarbons from a low‐temperature tar were separated into four groups, each consisting of a similarly wide range of molecules (approximate boiling range of each, 175°–500°): (a) n‐alkanes; (b) branched‐chain alkanes and cycloalkanes; (c) straight‐chain alkenes; and (d) branched‐chain alkenes and cycloalkenes. In (a), n‐alkanes, and in (c), alk‐1‐enes, trans‐alk‐2‐enes and cis‐alk‐2‐enes from C10 to C37 were identified and quantitatively estimated. Group (b) contained pristane and phytane among the few predominant branched‐chain species present, and molecules with isopropyl groups and single and condensed saturated rings. Group (d) was predominantly mono‐olefinic, the double bonds probably being in the terminal position in alkyl chains; isopropyl groups were also present.

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Distribution of aliphatic and aromatic carbons in H-Coal liquids by quantitative 13C FT-n.m.r. spectroscopy

Joseph

Wong

1980

Fuel

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Solvent extraction study of a whole, low‐temperature tar

Cited by 4 publications

References 4 publications

Characterization of Middle-Temperature Gasification Coal Tar. Part 2: Neutral Fraction by Extrography Followed by Gas Chromatography–Mass Spectrometry and Electrospray Ionization Coupled with Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Characterization of Middle-Temperature Gasification Coal Tar. Part 2: Neutral Fraction by Extrography Followed by Gas Chromatography–Mass Spectrometry and Electrospray Ionization Coupled with Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Aliphatic hydrocarbons in a low‐temperature tar

Distribution of aliphatic and aromatic carbons in H-Coal liquids by quantitative 13C FT-n.m.r. spectroscopy

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