抄録
Spherical particles made of cellulose powder were pyrolyzed in a 4.3 cm i.d. fluidized bed over a temperature range of 350 to 550°C in a stream of nitrogen gas with the primary aim of producing tar and levoglucosan in the tar.
Higher yields of tar and levoglucosan were achieved under operating conditions in which the cellulose particles tended not to sink into the bed, and secondary decomposition of tar was reduced accordingly. The highest yields of tar and levoglucosan respectively at 400°C were 63% and 32% of the original weight of cellulose. These values are much higher than those reported in previous studies of fluidized beds and fixed-bed reactors in atmospheres of inert gases. The variation with time of the concentration of gas containing carbon dioxide and carbon monoxide could be simulated satisfactorily by a kinetic model in which secondary decomposition of the tar was taken into account.
