Valorisation d'une lignine alcaline industrielle : vers le développement de nouveaux synthons et oligomères bio-sourcés issus de la lignine

Abstract : A valorization of alkaline lignin from an industrial pulping liquor has been proposed for this project. Before considering any chemical modification or potential applications, the lignin structure has been elucidated. An efficient three-steps protocol for extraction and purification of lignin from industrial liquor has been established. This protocol leads to high purity sample of lignin (95%) and allows the recovery (68%) of the lignin initially present in the alkaline liquor. Alkaline lignin has been characterized utilizing analytical methods and thermogravimetric analysis. This precise structure elucidation was critical for proceeding to chemical modification of alkaline lignin. Chemical modification of alkaline lignin has been done by oxidation in alkaline media. Three major oxidized products have been isolated depending on the extraction solvent: oligomers bearing carboxylic groups and aromatic molecules. This thesis work led to the synthesis of value-added bio-sourced chemicals and functionalized oligomers. The polyacids from lignin obtained should be studied to form new biobased polymers such as polyesters, polyamids or polyurethanes.
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Olivia Condassamy. Valorisation d'une lignine alcaline industrielle : vers le développement de nouveaux synthons et oligomères bio-sourcés issus de la lignine. Polymères. Université de Bordeaux, 2015. Français. ⟨NNT : 2015BORD0265⟩. ⟨tel-01256622⟩

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