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Fractionnement de déchets de panneaux de bois MDF post-consommation par voie chimique pour la réalisation de matériaux biosourcés à haute valeur ajoutée

Abstract : Wood-based medium-density fiberboards (MDF) are principally used for furniture and fittings and areproduced in great volumes around the world. The annual quantity of MDF waste generated world-wide is estimated to be over 40 million m3. Currently, there is noviable way to transform MDF into useful products due to the presence of contaminants such as resins and finishes (paint, varnish, laminated or plastic). This type of waste, composed of approximately 85-90 % of wood, represents a significant source of lignocellulosic material. This thesis describes research on transforming this under-utilized resource into high valued materials via a fractionation process. An alkali treatment followed by a delignification step, allows the extraction of hemicelluloses and lignin respectively, leading to the isolation of pure cellulose. This cellulose was converted to nanocelluloses in the form of nanocrystals by acidhydrolysis and nanofibrils by mechanical fibrillation. The cellulose nanocrystals obtained from waste MDF is shown to have similar characteristics to those obtained from virgin wood fibers. The hemicelluloses-rich fraction obtained by an alkali treatment from MDF waste was purified, precipitated by ethanol and then further used in the preparation of acrylic acid based hydrogels. The hydrogels generated had similar characteristics to those made from commercial beech xylans.This research clearly demonstrates the technical feasibility to convert MDF waste into high value added products, opening a new conversion route to recycle them.
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Submitted on : Thursday, May 9, 2019 - 12:24:13 PM
Last modification on : Wednesday, February 26, 2020 - 4:11:45 PM

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  • HAL Id : tel-02124151, version 1

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Laetitia Couret. Fractionnement de déchets de panneaux de bois MDF post-consommation par voie chimique pour la réalisation de matériaux biosourcés à haute valeur ajoutée. Génie des procédés. École centrale de Nantes, 2017. Français. ⟨NNT : 2017ECDN0025⟩. ⟨tel-02124151⟩

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