1992 Volume 71 Issue 2 Pages 99-106
To evaluate the effects of catalyst concentration on liquefaction, concentration distributions of the catalyst particles in a slurry reactor were estimated and autoclave experiments were carried out under various gasliquid mass transfer conditions.
The estimation showed following results. The concentration distributions of catalyst particles became more uniform with smaller iron particles. And when dp<dpap=min, ap (surface area of catalyst particles in a slurry) increased with decreasing dp (diameter of catalyst particle).
The autoclave experiments showed following results. Coal conversions increased with increasing of catalyst concentration under the good mass tranpfer condition. On the other hand, under the poor mass transfer condition, the conversions decrease at high catalyst concentration.
The results which used hydrogenated anthracene oil as a solvent showed higher oil yields with lower hydrogen consumption. Yields of methane under the poor mass transfer condition were higher than those of under the good mass transfer condition, it shows that production of methan reflect the mass transfer condition in the reactor.
These results suggest that using of smaller iron particle catalyst and better donor solvent under the condition of better gasliquid mass transfer lead to higher coal conversion.