Bio-phenolic compounds production through fast pyrolysis: Demineralizing olive pomace pretreatments

An original pathway to renewable production of phenol-rich bio-oil by fast pyrolysis pretreated olive pomace (OP) was researched. However, inherent inorganic elements (especially alkali and alkaline earth metals) in biomass feedstocks largely modified the final composition. To alter their catalytic activity pyrolysis, different demineralisation processes (water, acid pretreatments) were employed. There also an in-depth study phenolic compounds, analysing oxygen-containing substituted groups linked benzene ring. From water leached samples, potassium removed, enhancing selective guaiacol (at room temperature) syringol T = 90 ºC). Important differences observed with HCl HNO3 pretreatments regarding carboxylic distribution. For pretreatment NaOH, sodium content sample increase 83%. Thus, optimal selectivity (36.9%) achieved for OP sample, where (5.9%) vinyl (6.2%) yields increased methyl decreased. This marks efficient clean converting agricultural waste into valuable enriched bio-oil. could constitute a new way obtaining these compounds using agriculture biomass.