Organosulphur compounds in coals as determined by reaction with Raney nickel and microscale pyrolysis techniques. Quarterly report, 1 July 1995--31 October 1995

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As well as studying coal samples from Oklahoma and Missouri States, we have now completed the preliminary part of a study of a well known high organosulphur containing coal, Illinois No. 6. As a number of other research groups have used Illinois No. 6 for study, we thought it wise to also analyse this coal for comparison of our method with existing data reported in the literature. To date, analyses of the aliphatic fractions of the free maltene components and the aliphatic hydrocarbons isolated following desulphurization of the free maltene polar fraction, asphaltenes and pre-extracted coal matrix have been performed ... continued below

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8 p.

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Stalker, L. & Philp, R.P. December 31, 1995.

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Description

As well as studying coal samples from Oklahoma and Missouri States, we have now completed the preliminary part of a study of a well known high organosulphur containing coal, Illinois No. 6. As a number of other research groups have used Illinois No. 6 for study, we thought it wise to also analyse this coal for comparison of our method with existing data reported in the literature. To date, analyses of the aliphatic fractions of the free maltene components and the aliphatic hydrocarbons isolated following desulphurization of the free maltene polar fraction, asphaltenes and pre-extracted coal matrix have been performed in duplicate. So far, most of these samples have been analysed by GC and subsequently quantified using n-C{sub 24}D{sub 50}. As Figures 1 and 2 show, the duplicates for the desulphurized products (e.g. Figure 2a and 2b of desulphurized asphaltenes) while showing broad similarities, do not appear to be identical. This is emphasized by differences in the yields of n-alkanes generated, quantified in Table 1. Abundance of corresponding n-alkanes are often quite variable for duplicate analyses, which have been normalized to the quantity of original starting material. While inhomogeneity of sampling can easily explain the variation in abundance of products generated for the asphaltenes and coal matrix, the same cannot be said for the free polar compounds, which dissolve easily in the methanol/tetrahydrofuran solvent system used in the desulphurization process. It would therefore appear that desulphurization experiments should be performed at the very least, in duplicate to gain a clear impression of the distribution and abundance of aliphatic products cleaved from organosulphur compounds. The GC analysis also appears to show that there are different organosulphur compound precursors trapped in the different fractions of the coals.

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8 p.

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OSTI as DE96008538

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  • Other Information: PBD: [1995]

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  • Other: DE96008538
  • Report No.: DOE/PC/94214--T5
  • Grant Number: FG22-94PC94214
  • DOI: 10.2172/211572 | External Link
  • Office of Scientific & Technical Information Report Number: 211572
  • Archival Resource Key: ark:/67531/metadc669236

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Nov. 24, 2015, 6:49 p.m.

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Stalker, L. & Philp, R.P. Organosulphur compounds in coals as determined by reaction with Raney nickel and microscale pyrolysis techniques. Quarterly report, 1 July 1995--31 October 1995, report, December 31, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc669236/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.