Structural analysis of bio-oils from fixed-bed pyrolysis of Euphorbia rigida and sunflower pressed bagasse

Fixed-bed tars of Euphorbia rigida and sunflower pressed bagasse have been investigated for their structures. These mrs were fractionated into pentane -soluble and -insoluble compounds (asphaltenes). Pentane soluble were then solvent fractionated into pentane, toluene, ether and methanol subfractions by fractionated column chromatography. The aliphatic and low-molecular-wei ght aromatic subfractions of the bio-oils were then analyzed by capillary c olumn gas-liquid chromatography and GC/MS. Further structural analysis of b io-oils and aromatic and polar subfractions were conducted to FTIR and H-1- NMR spectra.