OP-II-3

OP-III-A-4pyrolysis is performed under vacuum conditions, CO 2 and hydrogen concentrations inthe product gas increase and CO amount decreases.Bio-oil is a very complex mixture of oxygenated compounds, so in order tosimplify the results products have been grouped taking into account their functionalgroups. The main pyrolysis products are phenols, which yield increases whenworking under vacuum conditions. At low pressure benzenediols amount is increasedwhile guaiacols and alkyl-phenols decrease. On the other hand, one of the mostinteresting products in the bio-oil is levoglucosane, and its yield is augmented undervacuum conditions.40Composition (%wt)353025201510aldehydesalcoholsacidsfuranesketonesphenolssaccharides50500 ºC, 1 atm 500 ºC, 0.25 atmFigure 2. Effect of pressure in the composition of bio-oil.Finally, biomass char has been characterized as well, due to its possibleapplication as active carbon after being subjected to an activation process. It hasbeen noticed that when operating at low pressure the surface properties of the charare improved.References[1]. Lopez G., Aguado R., Olazar M., Arabiourrutia M., Bilbao J., Waste Management 2009, 29, 2649.[2]. Aguado R., Olazar M., San Jose M.J., Aguirre G., Bilbao J., Industrial & Engineering ChemistryResearch, 2000, 39, 1925.158