Steric Effects on Diffusion into Bituminous Coals

The reactions of maleic anhydride, cis-maleate esters, and acetylenedicarboxylate esters with Pittsburgh No. 8 or Illinois No. 6 coal using o-xylene or o-dichlorobenzene solvent are diffusion controlled. Diffusion is Fickian in all cases. The measured activation energies are between 5.4 and 7.6 kcal...

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Veröffentlicht in:	Energy & fuels 2006-01, Vol.20 (1), p.257-261
Hauptverfasser:	Larsen, John W., Lee, Doyoung
Format:	Artikel
Sprache:	eng
Schlagworte:	01 COAL, LIGNITE, AND PEAT ACTIVATION ENERGY ANHYDRIDES Applied sciences BITUMINOUS COAL CHEMICAL REACTIONS Coal and derived products DIFFUSION Energy ESTERS Exact sciences and technology FICK LAWS Fuels STEREOCHEMISTRY Structure, chemical and physical properties
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Zusammenfassung:	The reactions of maleic anhydride, cis-maleate esters, and acetylenedicarboxylate esters with Pittsburgh No. 8 or Illinois No. 6 coal using o-xylene or o-dichlorobenzene solvent are diffusion controlled. Diffusion is Fickian in all cases. The measured activation energies are between 5.4 and 7.6 kcal/mol. Diffusion rates decrease slowly with increasing alkyl chain length and sharply with branching. Diffusion rates are slightly faster with o-xylene than when o-dichlorobenzene is used.
ISSN:	0887-0624 1520-5029
DOI:	10.1021/ef0501851