This paper reports the
physico-chemical characteristics of the products derived from the thermolysis
of waste silver fir (Abies alba Mill.)
wood at different temperatures (400℃-600℃) in a pilot scale plant. Depending on the thermolysis
temperature, the procedure yielded 45-53 wt%
pyroligneous acid with a high water content (80-86 wt%) and pH ≈3.6. The process also produced a
carbonaceous solid or biochar (23-26 wt%), its properties strongly dependent on the
thermolysis temperature. Gases (20-31 wt%) were also
produced; these were transformed into electrical energy via a gas turbine. The pyroligneous acid
was centrifuged to isolate a subfraction composed mostly of phenols (phenol,
mequinol and furfural) with a total C content of 68-74 wt%. The remainder was subjected to
fractionated distillation at laboratory scale, and the distillate subjected to
liquid-liquid extraction using diethyl ether in two stages to obtain a bio-oil
composed mainly of acetic acid (≈47%), aldehydes, ketones and alcohols (≈31%), phe- nols (≈18%) and aliphatic alcohols.The characteristics of the bio-oil
depended on the thermolysis temperature.
Cite this paper
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