Supercritical gas extraction of Taiheiyo coal.

概要

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Supercritical gas extraction of Taiheiyo coal has been investigated using toluene, toluene-tetralin mixtures, toluene-quinoline mixtures, and water as solvents with semi-batch type apparatus.<BR>Regardless of the solvents used, extraction yield and conversion increased with an increase in extraction pressure and reached a maximum at about 20MPa. For toluene, a maximum in extraction yield occurred at a temperature around 350°C, and a nearly linear relation was observed between the conversions and temperature in the range of 330 to 380°C.<BR>Extraction of coal gave three products: coal extract, tar, and gas. Small amounts of tetralin or quinoline added to the toluene solvent increased coal extract yield remarkably but conversion only increased slightly. Water gave a higher proportion of gas whereas toluene gave more tar. It was found that the distribution of these products could be controlled by changing the solvent species.<BR>The coal extract was rich in volatile matter and was a pitch-like material having a softening point of about 100°C. The extracted material (coal extract and tar) was pyridine soluble matter and consisted of almost only asphaltene (>90wt%). The molecular structure of the coal extract became more condensed with increasing temperature, pressure and extraction time. The extraction mechanism could be explained using a two-component structure model.
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