63.溶媒流通式液化による褐炭の最大転化率(石炭利用における科学と工学の融合)

抄録

This study has been carried out for the purpose to experimentally define the conversion of coal in liquefaction as the mass fraction of material dissolved into solvent under conditions in which the material is quickly swept away from the reactor so that extra-particle secondary reactions in liquid/vapor phase are sufficiently suppressed. Yallourn brown coal packed in a tubular reactor was heated under flow of tetralin (TL) or 1-methylnaphthalene (MN) at a heating rate of 100K/min to a temperature ranging from 623 to 708K which was held for 1-270min. The conversion using TL increases with the holding time and levels off at 96% at 643K and higher temperatures. The level-off conversion is thus defined as the temperature-independent ultimate conversion of the coal. The level-off conversion under flow of MN is 72%, lower by 24% than that for TL. This difference indicates enhanced degradation of the coal caused by hydrogen donation from TL within the particle.