Separation and Analysis of Organic Compounds in Water Soluble Fraction of Bio-Oil

A rice hull bio-oil sample obtained by rapid pyrolysis was first dissolved into water obtaining two fractions; water soluble and insoluble fractions. The water soluble fraction was further extracted sequentially with petroleum ether, CS2, CCl4, CHCl3 and ethyl acetate. All the extracts were analyzed with gas chromatography/mass spectrometry (GC/MS). In total, 48 organic species were identified and classified into phenols, ketones, aldehydes, alcohols, esters, carboxylic acids (CAs), and other species (OSs). On gas chromatography/mass spectrometry (GC/MS) analysis of the extractions, a series of phenols, ketones, aldehydes and esters in the water soluble fraction were detected. In addition, Hydroxyacetone was separated in high purities. Understanding the diversity of OCs in the bio-oil is helpful for the efficient utilization of the bio-oil as value-added chemical.