The degradation of cellulose and hemicellulose produces acids, anhydrosugars
, aldehydes, alcohols, and ketones of small molecular weight.
Gray: biooil; red: sugar monomers including glucose, galactose, mannose, xylose, and arabinose; green: anhydrosugars
including levoglucosan, cellobiosan, and cellotriosan .
As their volatile products, wood polysaccharides form anhydrosugars
, furans, aldehydes, ketones and carboxylic acids.
BioOil Chemical Constituents Water 20-25% Water insoluble pyrolytic lignin 25-30% Organic acids 5-12% Non-polar hydrocarbons 5-10% Anhydrosugars
5-10% Other oxygenated compounds 10-25% BioOil Chemical Constituents Note: Table made from pie chart.