Separation of Lignin from Corn Stover Hydrolysate with Quantitative Recovery of Ionic Liquid

Abundant lignocellulosic biomass could become a source of sugars and lignin, potential feedstocks for the now emergent biorenewable economy. The production and conversion of sugars from biomass have been well-studied, but far less is known about the production of lignin that is amenable to valorizat...

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Bibliographic Details
Published in:ACS sustainable chemistry & engineering 2015-04, Vol.3 (4), p.606-613
Main Authors: Underkofler, Kaylee A, Teixeira, Rodrigo E, Pietsch, Stephen A, Knapp, Kurtis G, Raines, Ronald T
Format: Article
Language:English
Subjects:
09 BIOMASS FUELS
1-butyl-3-methylimidazolium chloride
Bagasse
biomass
biorefinery
centrifugation
chlorides
corn stover
feedstocks
filtration
fuels
hydrolysates
hydrolysis
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ionic liquids
lignin
lignocellulose
slurries
sugars
techno-economics
valorization
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Summary:Abundant lignocellulosic biomass could become a source of sugars and lignin, potential feedstocks for the now emergent biorenewable economy. The production and conversion of sugars from biomass have been well-studied, but far less is known about the production of lignin that is amenable to valorization. Here we report the isolation of lignin generated from the hydrolysis of biomass dissolved in the ionic liquid 1-butyl-3-methylimidazolium chloride. We show that lignin can be isolated from the hydrolysate slurry by simple filtration or centrifugation, and that the ionic liquid can be recovered quantitatively by a straightforward wash with water. The isolated lignin is not only free from ionic liquid but also lacks cellulosic residues and is substantially depolymerized, making it a promising feedstock for valorization by conversion into fuels and chemicals.
ISSN:2168-0485
2168-0485
DOI:10.1021/sc500731c