Valorisation des marcs de raisins épuisés: vers un procédé d'éxtraction de tannins condensés à grande échelle pour la production d' adhesifs pour panneaux de particules

Abstract : Wastes from the French wine industry are traditionally treated and upgraded in distilleries. This work deals with the study of an industrial-scale valorization of a final waste from distilleries: the spent grape pomace. Pomace from different French production areas were chemically characterized, in terms of condensed tannins and polysaccharides. An extraction process of condensed tannins has been optimized in laboratory and was then transferred to an industrial scale. Several extractions were carried out in three partner distilleries and chemical analysis (in terms of polyphenols, condensed tannins, sugars and inorganics) of the different isolated fractions were performed. Industrial extracts were used for the elaboration of the first particleboard whose adhesive constituted by 80% of grape pomace tannins and strengthened with a synthetic resin to satisfy the European standard for internal bond. These industrial extracts were also used to partially substitute a phenol-formaldehyde resin for the production of particleboards. Different post-treatments were performed on the pomace extracts in order to increase their chemical reactivity toward cross linking agents. Filtration with a cut-off of 1 µm led to a slight improvement in adhesive performances, whereas acid hydrolysis of the extract have degraded it. An ultrafiltration process of the extracts at 5 kDa or at 1 kDa enabled to get much more reactive extracts and opened up prospects for the production of bio-based adhesives for wood
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François Gambier. Valorisation des marcs de raisins épuisés: vers un procédé d'éxtraction de tannins condensés à grande échelle pour la production d' adhesifs pour panneaux de particules. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0174⟩. ⟨tel-01751065⟩

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