One bituminous, two sub-bituminous, and two brown coals were combined with various mixing ratios each other. To elucidate an effect of coal mixture on liquefaction, direct liquefactions of these coal mixtures were carried out by using 1, 2, 3, 4-tetrahydroquinoline (THQ) as a hydrogen donor vehicle at 400°C, autogenous in tubing-bomb reactor.
Between mixing ratios and conversion to benzene soluble matter, an additive property came into existence when the residence time was 10 minutes. Particularly, in any case of the mixture made of only sub-bituminous and/or brown coals, the conversionwas about 80% constantly.
