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Advisor(s)
Abstract(s)
The outer bark of Douglas-fir (Pseudotsuga menziesii)
has a significant amount of cork tissue that may be
an important source of chemicals derived from its natural
polymers, suberin, cellulose, hemicelluloses and lignin.
The present work focuses on the polyalcohol liquefaction
of Douglas-fir bark with glycerol and polyethylene glycol
(PEG) in order to obtain a liquid that can be further processed
to other chemicals and products. The results show
that Pseudotsuga bark can be liquefied in a significant
percentage in presence of alkali. The best liquefaction
yield was obtained with 6% KOH as agents. Although the
use of a cosolvent is favorable, good liquefaction yields
can also be obtained by glycerol alone. Lower temperatures
are favorable as they lead to acceptable liquefaction
yields. FTIR-ATR studies showed that all the structural
compounds of the bark were attacked and depolymerized.
The process tested has a high potential for generation of
value-added products from liquefied Douglas-fir bark.
Description
Keywords
Cork FTIR Liquefaction Pseudotsuga menziesii Suberin
Citation
Esteves, B., Cruz-Lopes, L., Ferreira, J., Domingos, I., Nunes, L., & Pereira, H. (2018). Optimizing Douglas-fir bark liquefaction in mixtures of glycerol and polyethylene glycol and KOH. Holzforschung, 72(1), 25–30. https://doi.org/10.1515/hf-2017-0018
Publisher
De Gruyter