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Advisor(s)
Abstract(s)
Olive tree branches (OB) and leaves (OL) from the Viseu region (Portugal) were studied
for their chemical composition and liquefaction behavior using polyalcohols. Chemical
analysis revealed that OL contained higher ash content (4.08%) and extractives, indicating
more bioactive compounds, while OB had greater α-cellulose (30.47%) and hemicellulose
(27.88%). Lignin content was higher in OL (21.64%) than OB (16.40%). Liquefaction
experiments showed that increasing the temperature from 140 ◦C to 180 ◦C improved
conversion, with OB showing a larger increase (52.5% to 80.9%) compared to OL (66%
to 72%). OB reached peak conversion faster, and the optimal particle size for OB was
40–60 mesh, while OL performed better at finer sizes. OL benefited more from higher
solvent ratios, whereas OB achieved high conversion with less solvent. FTIR analysis
confirmed that acid-catalyzed liquefaction breaks down lignocellulosic structures, depolymerizes
cellulose and hemicellulose, and modifies lignin, forming hydroxyl, aliphatic, and
carbonyl groups. These changes reflect progressive biomass degradation and the incorporation
of polyalcohol components, converting solid biomass into a reactive, polyol-rich liquid.
The study highlights the distinct chemical and processing characteristics of olive branches
and leaves, informing their potential industrial applications.
Description
Keywords
Olea europaea olive tree pruning chemical composition liquefaction agroindustrial residues optimization
Pedagogical Context
Citation
Domingos, I.; Ferreira, M.; Ferreira, J.; Esteves, B. Olive Tree (Olea europaea) Pruning: Chemical Composition and Valorization of Wastes Through Liquefaction. Sustainability 2025, 17, 6739
Publisher
MDPI
CC License
Without CC licence