Structural Comparison of Low-Molecular-Weight Extractable Compounds in Different Rank Coals Using Capillary Column Gas Chromatography

Chang, Huey-Ching K.; Bartle, Keith D.; Markides, Karin E.; Lee, Milton L.

doi:10.1007/978-1-4899-3671-4_7

Cited by 3 publications

(1 citation statement)

References 29 publications

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“…Conventional analytical techniques such as headspace gas chromatography and solvent extraction can only provide information for the gaseous (C 1-5 ) and heavy hydrocarbon (C 15+ ) constituents. 8,9 The C 6-14 fraction usually goes undetected because of volatility loss. In order to address this problem, a method for using supercritical CO 2 to extract the C 6-14 hydrocarbons from coal, followed by group-type separation of the extracts with packed capillary column supercritical fluid chromatography (SFC), was developed in this study.…”

Section: Introductionmentioning

confidence: 99%

Determination of Volatile Hydrocarbons in Coals and Shales Using Supercritical Fluid Extraction and Chromatography

Lazar

Wan

et al. 1997

Energy Fuels

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Conventional analytical techniques, such as headspace gas chromatography and Soxhlet extraction, can provide compositional information for the gaseous (C 1-5 ) and heavy (C 15+ ) hydrocarbon constituents, respectively. The volatile (C 6-14 ) hydrocarbons, if present, usually go undetected because of volatility fractionation and loss. In this study, supercritical CO 2 was used to extract the C 6 -C 14 volatile hydrocarbons from pulverized coal samples. Capillary column gas chromatography/mass spectrometry was used to identify the mixture components, and packed capillary column supercritical fluid chromatography was used to separate and quantify the aliphatic and aromatic hydrocarbon class fractions. It was found that the compositions of the light hydrocarbon fractions included several homologous series of normal and branched aliphatic hydrocarbons, cyclic and aromatic hydrocarbons, and alkyl-substituted benzenes and naphthalenes; the concentrations of these volatile hydrocarbons ranged between 0.01 and 0.2 wt % of the bulk material for different coal and shale samples.

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Section: Introductionmentioning

confidence: 99%

Determination of Volatile Hydrocarbons in Coals and Shales Using Supercritical Fluid Extraction and Chromatography

Lazar

Wan

et al. 1997

Energy Fuels

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Determination of polycyclic aromatic sulfur heterocyclic compounds in airborne particulate by gas chromatography with atomic emission and mass spectrometric detection

Becker

Nilsson

Colmsjö

et al. 1998

Journal of Chromatography A

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Thermogravimetry−Photoionization Mass Spectrometry of Different Rank Coals

and¹,

Johnston²,

Tomić³

et al. 1999

Energy Fuels

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Volatile matter evolved during pyrolysis of 20 different rank coals was studied by thermogravimetry-photoionization mass spectrometry (TG-PI-MS). The composition of the TGA effluent revealed several significant trends with coal rank. First, the relative intensities of peaks due to compounds containing oxygen such as C n H 2n O (n ) 2, 3, or 4), phenols, and dihydroxybenzenes decreased with increasing coal rank. Also, the relative intensities of peaks due to aromatic compounds such as naphthalenes, phenanthrenes, and pyrenes increased with increasing coal rank. Mass signals due to sulfur compounds evolved from coal showed qualitative correlations between CS 2 (%TIC) and pyritic sulfur content and between CH 3 SH (%TIC) and aliphatic sulfur content. Several of the coals were extracted with a solvent to remove the soluble portion of the coal. TG-PI-MS analysis of the raw coal, extracted material and coal residue remaining after solvent extraction produced very similar mass spectra. These results suggest that the majority of the compounds observed by TG-PI-MS are products of thermal cleavage of bonds within the coal structure. This conclusion is further supported by 337 nm laser desorption mass spectrometry of the solvent extracts. The results from these analyses suggest that volatile matter, like coal itself, consists of compounds with a range of molecular weights but with similar molecular structures.

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Structural Comparison of Low-Molecular-Weight Extractable Compounds in Different Rank Coals Using Capillary Column Gas Chromatography

Cited by 3 publications

References 29 publications

Determination of Volatile Hydrocarbons in Coals and Shales Using Supercritical Fluid Extraction and Chromatography

Determination of Volatile Hydrocarbons in Coals and Shales Using Supercritical Fluid Extraction and Chromatography

Determination of polycyclic aromatic sulfur heterocyclic compounds in airborne particulate by gas chromatography with atomic emission and mass spectrometric detection

Thermogravimetry−Photoionization Mass Spectrometry of Different Rank Coals

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