生物油常压馏分约占样品总量的50％，其余为结焦残余物，说明生物油不易蒸发燃烧，但可以雾化 燃烧；生物油成分复杂，其中由木质素衍生的酚类含量较为丰富，可采用减压蒸馏或蒸汽蒸馏进行分离提取； 蒸馏方法还可用于生物油的品质改良，如增强油品的稳定性、提高热值和降低pH值等。

Distillate from atmospheric distillation of bio-oil accounts for about50%by weight. Bio-oil can't be applied for requiring complete evaporation before combustion, but can be employed for atomizing combustion. The composition of bio-oil is complicated, phenols derived from lignin can be extracted by vacuum distillation or/and steam distillation. And the distillation method can also be used to improve the ov erall fuel properties of bio-oil such as stability,  heat value, the pH value and so on.