C. Effect of Particle Size
This experimental controlled at the condition of N2 flow 100 ml/min and varying temperature 300-
450 C. The shell was separated for two particle sizes 1.13 and 2.18 mm for study the effect of particle
size to bio oil production compared with residue.
The Fig.5 showed the bio oil yield from residue was middle of the two types of shell, except that on
450 C and there were the same trend line of bio oil yield between the
1.13 and 2.18 mm. However, the bio oil yield from size 2.18 mm was higher than size 1.13 mm. It seems
that although the smaller particle has higher surface area but the tiny particle size affect the low thermal
resistance too. Then the particle size 1.13 mm has more chance into secondary thermal cracking period
and produce un-condensable gas. Additional, the larger size 2.18 mm showed the highest yield in each
pyrolysis temperature because of its strongest structure.