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- W126579410 abstract "Sequential solvent extraction of coal with a series of increasingly better solvents (Toluene, THF, DMF, Pyridine) has been used to examine the effect of artificial weathering on several Illinois coals. A similar method with a different set of solvents was recently employed by Kister, et al. on a low-rank French coal. In both cases, each extract is soluble in all later solvents and analysis of the entire set of extracts produces more information than extraction with a single solvent. Because extracts so isolated have experienced some fractionation and concentration, FT-IR and GPC analyses of the extracts often reveal subtle changes due to chemical treatment, such as weathering, not obvious from analysis of the whole coals. The availability of premium coals is an opportunity for many laboratories to study the effects of both coal rank and coal weathering on a variety of properties of the same coals. Changes in sequential solvent extraction, FT-IR spectra of extracts and residues, GPC analyses of extracts, and solvent swelling of residues brought about by weathering of five Argonne Premium Coals are the subject of this paper." @default.
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- W126579410 date "1987-01-01" @default.
- W126579410 modified "2023-09-23" @default.
- W126579410 title "Effect of air oxidation on sequential solvent extraction of the Argonne Premium Coal samples" @default.
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