Single-step microwave-assisted hot water extraction of hemicelluloses from selected lignocellulosic materials – A biorefinery approach
Mihiretu, Gezahegn T.; Brodin, Malin; Chimphango, Annie F.; Øyaas, Karin; Hoff, Bård Helge; Görgens, Johann F.
Journal article
Submitted version
Permanent lenke
http://hdl.handle.net/11250/2494015Utgivelsesdato
2017Metadata
Vis full innførselSamlinger
- Institutt for kjemi [1404]
- Publikasjoner fra CRIStin - NTNU [38685]
Sammendrag
The viability of single-step microwave-induced pressurized hot water conditions for co-production of xylan-based biopolymers and bioethanol from aspenwood sawdust and sugarcane trash was investigated. Extraction of hemicelluloses was conducted using microwave-assisted pressurized hot water system. The effects of temperature and time on extraction yield and enzymatic digestibility of resulting solids were determined. Temperatures between 170–200 °C for aspenwood and 165–195 °C for sugarcane trash; retention times between 8–22 min for both feedstocks, were selected for optimization purpose. Maximum xylan extraction yields of 66 and 50%, and highest cellulose digestibilities of 78 and 74%, were attained for aspenwood and sugarcane trash respectively. Monomeric xylose yields for both feedstocks were below 7%, showing that the xylan extracts were predominantly in non-monomeric form. Thus, single-step microwave-assisted hot water method is viable biorefinery approach to extract xylan from lignocelluloses while rendering the solid residues sufficiently digestible for ethanol production.