The NREL Fast Ablative Pyrolysis Technology was employed to generate o
ils from various biomass feedstocks. The oil yield from wood (64 perce
nt) was higher than from herbaceous species (51 percent). Biomass oils
have potential to be used as fuel though their properties are differe
nt from those of petroleum derived oils. They are multicomponent mixtu
res containing various groups of organic compounds such as sugars, ald
ehydes, acids, and phenolics. The density of the oils is about 1.2 g/m
l and the pH is in the range 2.5-3.7. The viscosity of 20-80 cP (at 45
degrees C) corresponds to that of No. 6 fuel oil. The high heating ua
lue for the biomass oils is in the range of 22.5-24.4 MJ/kg on a water
-free basis. Considering the highest oil yields, it corresponds to app
roximately 65 percent of the wood heating value transferred to the oil
.