Chemical structure of coal tar during devolatilization

Conference · Tue Oct 01 04:00:00 EDT 1996

OSTI ID:370431

Watt, M; Fletcher, T H; Bai, S; Pugmire, R J ^[1]

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1. Univ. of Utah, Salt Lake City, UT (United States)

The analysis of coals and coal chars by solid-state {sup 13}C NMR techniques combined with the accompanying analysis of coal tars and extracts by high resolution {sup 1}H NMR and {sup 13}C NMR spectroscopy, provides valuable information on the transformations that occur during coal devolatilization. Current devolatilization models use solid-state NMR data directly to coal-dependent structural input parameters. A technique was recently documented that provides detailed {sup 13}C NMR analysis of coal-derived liquids and this method has now been applied to coal tars. Tars were obtained from drop tube experiments at moderate temperature (900 K) to minimize secondary reactions. The tar analysis indicates that the average number of aromatic carbons per cluster in the tar is significantly lower than that observed in the parent coal, which has major implications on current network devolatilization models. The amount of nitrogen per cluster can also be estimated from the new data, consequently providing information on nitrogen release.

• OSTI ID: 370431
• Report Number(s): CONF-960376--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
66 PHYSICS
CARBON 13
CHARS
COAL TAR
DEVOLATILIZATION
MOLECULAR STRUCTURE
NMR SPECTRA