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Title
Spruce bark hydrolysis to optimize phenolic content
Authors
DURET XAVIER FREDON EMMANUEL GERARDIN PHILIPPE and MASSON ERIC
Received
November 21, 2012
Published
Volume 46, Issue 9-10 November-December
Keywords
Norway spruce bark, acid hydrolysis, high phenolic content, experimental design
Abstract
In this study, the optimization of polysaccharides hydrolysis in order to increase the phenolic content of
Picea Abies bark was investigated by screening experimental design. The high phenolic content of bark
was interesting in the thermosetting resins synthesis, but the carbohydrate fraction had a negative effect on
the mechanical properties and durability of phenolic resins. The purpose of this paper was to determine the
main factors influencing the phenolic content of bark during acid hydrolysis. The hydrolysis was
performed under atmospheric pressure in an aqueous solution of sulfuric acid. The effects of the reaction
time (5 to 24 hours), acid concentration (3 to 10%), solid/liquid ratio (1/10 to 1/5), and particle sizes on the
weight loss, lignin content, holocellulose content, and sugar, as well as degradation products of the
hydrolysis, were studied.
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