flash pyrolysis of forestry residues from the portuguese central inland region within the framework of the biorefina-ter project

the feasibility of the valorization by flash pyrolysis of forest shrub wastes, namely bushes (cytisus multiflorus, spartium junceum, acacia dealbata and pterospartum tridentatum) has been studied in a conical spouted bed reactor operating at 500 °c, with a continuous biomass feed and char removal. high bio-oil yields in the 75–80 wt.% range have been obtained for all of the materials, with char yields between 16 and 23 wt.% and low gas yields (4–5 wt.%). bio-oils are composed mainly of water (accounting for a concentration in the 34–40 wt.% range in the bio-oil), phenols, ketones, acids and furans, with lower contents of saccharides, aldehydes and alcohols. although their composition depends on the raw material, the compounds are similar to those obtained with more conventional feedstocks.