Journal of the Fuel Society of Japan
Online ISSN : 2185-226X
Print ISSN : 0369-3775
ISSN-L : 0369-3775
Solvolysis of Coal by Petroleum Vacuum Residue (VII)
Conversion of Coal to Asphaltene
Tsuyoshi SAKAKIYoshio ADACHIMasao SHIBATASeiji ARITAHitoo KAKIYAMAHidemasa HONDA
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1981 Volume 60 Issue 12 Pages 994-1000

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Abstract
Conversion of coal to asphaltene by solvolysis reaction has been studied using petroleum vacuum residue or hydrogenated solvolysis pitch as solvent.
The fragments formed by thermal decomposition of coal at elevated temperature were stabilized with petroleum vacuum residue through its proton donating ability during solvo-lysis reaction, and coal becomes soluble in petroleum vacuum residue as asphaltene.When a part of Miike coal was heat-treated with two parts of Khafji asphalt under suitable solvolysis conditions (for example 390°C, 30min.), about 38% of coal was converted to asphaltene, oil and gas.On the other hand, using a large amount of asphalt (over 5 times), about 60% of Miike coal was disolved in petroleum vacuum residue by converting to aspha-ltene.
When bituminous coal which is fusible at high temperature was heat treated with a large amount of petroleum vacuum residue, 40-60% of coal was converted to asphaltene, oil and gas.In the case of non-fusible coal, however, the convertion of coal to asphaltene was very low.From these result, it is clear that the ability of petroleum vacuum residue converting coal to asphaltene is not so high.
In order to improve the ability of solvent, hydrogenated solvolysis pitch was used as solvent for solvolysis of coal.When a part of Miike coal was heat-treated with two parts of hydrogenated solvolysis pitch, about 45% of coal was converted to asphaltene, oil and gas.Therefore, it was found that the use of hydrogenated solvent for solvolysis of coal is very effective on the convertion of coal to asphaltene.
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© The Japan Institute of Energy
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