Can Paints and Varnish Impair the Physicochemical Properties of Wood Pyrolysis Oils?
Résumé
The use of pyrolysis oils from demolition woods is an interesting option to produce fuels or chemicals from waste wood. This work investigated the effect of paints and varnish, that contain various potential contaminants, on the properties of bio-oils obtained by thermal pyrolysis of wood or after ex-situ catalysis of the pyrolysis vapors using a H-ZSM-5 catalyst. The paints and varnish were analyzed and their main inorganic components identified. Clean beech wood samples were impregnated with commercial paints and varnish, and also individually with the main inorganic compounds (TiO2, CaCO3, BaSO4) found in the paints and varnish. These contaminated wood samples were pyrolyzed and the gas, liquid and solid products formed were thoroughly characterized, and compared to the products obtained from clean wood. The results show that the mineral contaminants remained in the chars and that the pyrolysis oils obtained by thermal pyrolysis were not significantly modified by the presence of contaminants on the wood. In ex-situ catalyzed pyrolysis experiments, the H-ZSM-5 catalyst promoted the formation of some fully deoxygenated aromatic compounds, which were not obtained without catalyst. However, the bio-oil produced from wood impregnated with commercial paints and varnish contained less fully deoxygenated compounds. This effect was not related to the mineral compounds present in the paints and varnish and could originate from the polymeric organic components present in their formulations.
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