Lignin depolymerisation in supercritical carbon dioxide/acetone/water fluid for the production of aromatic chemicals

摘要: Valorisation of lignin plays a key role in further development lignocellulosic biorefinery processes the production biofuels and bio-based materials. In present study, organosolv hardwood wheat straw lignins were converted supercritical fluid consisting carbon dioxide/acetone/water (300–370 °C, 100 bar) to phenolic oil oligomeric fragments monomeric aromatic compounds with total yield 10–12% based on lignin. These yields are similar state-of-the-art technologies such as base-catalysed thermal applied for depolymerisation. Addition formic acid increases species by stabilizing radicals. Supercritical depolymerisation yielded different compositions maximum 2.0% syringic 3.6% syringol, respectively. The results study showed that under conditions competition occurred between recondensation fragments.