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Vers une voie de valorisation du hêtre : synthèse de monomères furaniques biosourcés et furfurylation

Abstract : Beech is a wood species present in the French territory, particularly in the Grand-Est region. However, beech is a under used wood, especially for outdoor uses, because it is non durability and it is dimensional unstability. To promote and develop its use, it is necessary to limit its recovery in moisture and treat to protect it against fungi decay. Futhermore, current regulation on wood treatment products imposes the development of alternative wood treatments more respectful of the environment and health. In this context, the work developed during this thesis is focused on valorisation of beech as a material through its protection by a “non-biocide” treatment, furfurylation. This method consists in an polymerisation in situ by heating a furfuryl alcohol solution into beech solid wood. The development of process led to a bio-based beech composite with significantly improved durability and dimensional stability.On the other hand, beech is a hardwood species in which the hemicellulosic fraction is rich in pentoses, and more precisely in xylose, precursor of furfural. Work has been done to produce furfural by acidic steam distillation, from beech primary wood processing by products. This molecule is then chemically reduced to furfuryl alcohol by hydrogen transfer.These promising results to show that it is possible to set up a local production combining beech as a local source of furanic molecules and beech wood as a solid material
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Aurélia Imbert. Vers une voie de valorisation du hêtre : synthèse de monomères furaniques biosourcés et furfurylation. Génie chimique. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0333⟩. ⟨tel-01909446⟩

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