A series of batch autoclave experiments has been conducted in which the product boiling in the range 220-450°C was recycled several times to test the suitability of this liquid as a vehicle for the hydroliquefaction of Victorian brown coal. The product liquid was used at the end of each cycle as a vehicle for an independent small-scale coal hydrogenation and repetitive hydrogenations of the parent solvent were also carried out to help facilitate understanding of the role and chemical changes associated with the vehicle. It has been shown that the distillable coal-derived liquid, even without recycling part of the bottoms, has a hydrogenation potential in the same range as tetralin and hydrogenated anthracene oil, despite its relatively poor quality. However, the amount of liquid produced was less than the amount of solvent used.
- brown coal
- coal-derived liquids