Contribution à l’étude des complexes lignine-hydrates de carbone (LCC) dans le bois : étude de l’impact des différentes étapes d’un procédé de bioraffinerie sans soufre sur les LCC

Abstract : The valorization of lignocellulosic biomass is nowadays a major issue due to the reduction of fossil resources. Separating each component to valorize them the best way as possible is the goal of the pulp and paper biorefineries. The effluent of the mill, called the black liquor, is currently burnt to produce energy, but gasification would increase the energy efficiency. For this, a sulfur-free cooking of wood is necessary, as sulfur inhibits gasification.Therefore this study first focused on the feasibility of cooking without sulfur, which is more difficult than a conventional kraft cooking containing sulfur. The work was done on softwood which is more difficult to delignify than hardwood. The wood was first pretreated with an autohydrolysis to remove hemicelluloses for further valorization.The results were conclusive for the production of cellulose pulp for chemical applications. To explain the differences obtained, structural differences of wood components were looked for. Lignin did not show major differences whether the wood was prehydrolyzed or not, whereas the complexes between lignin and carbohydrates (LCCs) showed significant differences, which would explain the results obtained.
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Claire Monot. Contribution à l’étude des complexes lignine-hydrates de carbone (LCC) dans le bois : étude de l’impact des différentes étapes d’un procédé de bioraffinerie sans soufre sur les LCC. Génie des procédés. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAI116⟩. ⟨tel-01293498⟩

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