Lignocellulosic materials represent a widespread, low cost and renewable bioresource suitable as a raw material for the sustainable production of fuels, chemicals and materials. In quantitative terms, woods are the most important type of lignocellulosic materials. Considered as feedstocks for the industry, woods show important comparative advantages over other lignocellulosic materials of agricultural origin, including large availability, non-seasonal character, favorable composition (defined by their contents of polysaccharides and polyphenols, ash, sulfur and nitrogen), and ability to grow in lands unsuitable for agriculture, thus avoiding direct and indirect competition with the food chain. Eucalyptus spp. are fast growing hardwoods with favorable features to be valorized by sustainable conversion technologies. Eucalyptus is the most widely planted type of hardwoods, and can be produced at relatively low cost. Although the most important Eucalyptus species in terms of world plantations are E. grandis, E. urophylla, E. camaldulensis and E. globulus, growing attention is being paid to E. nitens owing to their decreased susceptibility to Gonipterus plagues and to its ability to resist a wide range of environmental conditions unsuitable for other Eucalyptus species. Ionic liquids (ILs), evetually representing an environmetally beneficial alternative to common solvents, have been exploited in fractionation of lignocellulosic materials. The most suited ones for Eucalyptus wood fractionation bear the methylimidazolium cation. In an attempt to extend the knowledge regarding the effects of IL-based fractionation of E. nitens, the fractionation of E. nitens wood was performed by consecutive stages of aqueous processing to achieve the selective solubilization of hemicelluloses, and a solid phase with increased contents of cellulose and lignin; and the delignification of this latter. Isolated lignins were characterized by 31P NMR, HSQC, 13C NMR and GPC to obtain key information defining their potential as substrates for further chemical conversion into value-added products.

Eucalyptus nitens lignins by ionic liquid-based biorefinery methods

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.