Extraction of intermediate and low-rank coals with supercritical toluene
β Scribed by Philip Cahill; Graham Harrison; Gregory J. Lawson
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 652 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0016-2361
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A low-rank coal is examined for swelling in benzene-pyridine and toluene-pyridine mixtures. In each case, swelling is shown to be mainly due to the pyridine, the action of which is specific and not amenable to interpretation by the solubility parameter approach to understanding coal swelling.
A rapid and reproducible method to quantify elemental sulphur in coal has been developed using supercritical fluid extraction (s.f.e.) and gas chromatography with atomic emission detection (g.c./a.e.d.). Quantitative spike recoveries of elemental sulphur were obtained from both sand (97+6%) and pre-