Lignin depolymerisation in supercritical carbon dioxide/acetone/water fluid for the production of aromatic chemicals
2012 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 106, 173-177 p.Article in journal (Refereed) Published
Valorisation of lignin plays a key role in further development of lignocellulosic biorefinery processes the production of biofuels and bio-based materials. In the present study, organosolv hardwood and wheat straw lignins were converted in a supercritical fluid consisting of carbon dioxide/acetone/water (300-370 degrees C, 100 bar) to a phenolic oil consisting of oligomeric fragments and monomeric aromatic compounds with a total yield of 10-12% based on lignin. These yields are similar to the state-of-the-art technologies such as base-catalysed thermal processes applied for lignin depolymerisation. Addition of formic acid increases the yield of monomeric aromatic species by stabilizing aromatic radicals. Supercritical depolymerisation of wheat straw and hardwood lignin yielded monomeric compounds in different compositions with a maximum yield of 2.0% for syringic acid and 3.6% for syringol, respectively. The results of the present study showed that under the applied conditions competition occurred between lignin depolymerisation and recondensation of fragments.
Place, publisher, year, edition, pages
2012. Vol. 106, 173-177 p.
Biorefinery, Lignin valorisation, Phenolic chemicals, Lignin supercritical depolymerisation, Phenols
IdentifiersURN: urn:nbn:se:kth:diva-91269DOI: 10.1016/j.biortech.2011.11.121ISI: 000300270500025ScopusID: 2-s2.0-84855345885OAI: oai:DiVA.org:kth-91269DiVA: diva2:509025
QC 201203122012-03-122012-03-122012-03-12Bibliographically approved