Abstract
The ash content, after filtration, of coal extract solutions produced using two different coals and two different samples of hydrogenated anthracene oil (HAO), and the consequential effect of varying digestion pressure and filtration temperature have been studied. It was found that if the digestion pressure is above 3.0 MPa, then the extract solution ash level is reduced significantly. However, this effect is modified by the coal or HAO used. This can be allowed for by reducing the filtration temperature for a given system. The condensed material vented during digestions was analysed, and it was found that there was no significant difference in the components present for different digestion pressures, only that a greater quantity was given off during lower pressure digestions. The vented material from low-pressure runs was added back to the digest prior to filtration, but it was found that this did not give low-ash extracts similar to those produced at higher pressure.
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