A biorefinery approach for fractionation of Miscanthus lignocellulose using subcritical water extraction and a modified organosolv process.

Arielle Kubota, Raitis Kalnins, Tim Overton

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
375 Downloads (Pure)

Abstract

Using a biorefinery approach, biomass polymers such as lignin and carbohydrates can be selectively purified from lignocellulosic feedstocks with the aim of generating not only lignocellulosic bioethanol but also high value bio-based compounds. Furthermore, the efficient use of the entire biomass can increase overall feedstock value and significantly contribute to process cost-effectiveness. Therefore, the aim of this work was to fractionate the main compounds of the energy crop Miscanthus x giganteus (MxG) using ‘green’ solvents in order to obtain cellulose-enriched fibres as well as non-toxic streams rich in hemicellulose and lignin. Two processing routes were compared: a direct 1-step modified organosolv method for simultaneous lignin and hemicellulose removal; and a 3-step sequential process using subcritical water extraction for recovery of first extractives then hemicellulose, followed by modified organosolv lignin extraction. Both methods successfully generated cellulose-enriched fibres; from a complex mixture of compounds present in MxG, it was possible to obtain fibres comprising 78% cellulose without the use of commonly-applied toxic solvents that can potentially limit end uses for processed biomass and/or need additional neutralisation steps. Fibres generated by the direct and sequential processes were very similar in composition; however, physicochemical analysis of the fibres using scanning electron microscopy, Fourier-transform infrared spectroscopy and principal component analysis confirmed structural differences resulting from the two processing routes, which were demonstrated to have an impact on downstream processing.
Original languageEnglish
Pages (from-to)52-59
JournalBiomass and Bioenergy
Volume111
Early online date22 Feb 2018
DOIs
Publication statusPublished - Apr 2018

Keywords

  • Subcritical water
  • Principal component analysis
  • Delignification
  • Biofuel
  • Biorefinery

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