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Quantitative glucose release from softwood after pretreatment with low-cost ionic liquids

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Title: Quantitative glucose release from softwood after pretreatment with low-cost ionic liquids
Authors: Gschwend, F
Chambon, C
Biedka, M
Brandt-Talbot, A
Fennell, P
Hallett, J
Item Type: Journal Article
Abstract: Softwood is an abundantly available feedstock for the bio-based industry, however, achieving cost-effective sugar release is particularly challenging owing to its guaiacyl-only lignin. Here, we report the highly effective pretreatment of the softwood pine (Pinus sylvestris) using ionoSolv pretreatment, a novel ionic liquid-based lignocellulose fractionation technology. Three protic, low-cost ionic liquids, 1-butylimidazolium hydrogen sulfate, triethylammonium hydrogen sulfate and N,N-dimethylbutylammonium hydrogen sulfate, were used to fractionate the biomass into a carbohydrate-rich pulp and a lignin. The carbohydrate-rich pulp was hydrolysed into fermentable sugars by enzymatic saccharification. Under the most successful pretreatment conditions, quantitative glucose release from the pulp was achieved, which equates to a projected glucose release of 464 mg per gram of pine wood entering the process. We further intensified the process by increasing the solid to solvent ratio up to 1:2 g/g while maintaining saccharification yields of 75% of the theoretical maximum. We also demonstrate for the first time that N,N-dimethylbutylammonium hydrogen sulfate, [DMBA][HSO4] is an excellent low-cost pretreatment solvent, surpassing the pretreatment effectiveness of its symmetrically substituted analogue triethylammonium hydrogen sulfate. This shows that ionoSolv pretreatment with protic hydrogen sulfate ionic liquids is a truly feedstock-independent pretreatment option, further increasing the commercial potential of this pretreatment technology.
Issue Date: 7-Feb-2019
Date of Acceptance: 14-Jan-2019
URI: http://hdl.handle.net/10044/1/65628
DOI: https://dx.doi.org/10.1039/C8GC02155D
ISSN: 1463-9262
Publisher: Royal Society of Chemistry
Start Page: 692
End Page: 703
Journal / Book Title: Green Chemistry
Volume: 21
Issue: 3
Copyright Statement: © The Royal Society of Chemistry 2019
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/K038648/1
EP/K014676/1
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Green & Sustainable Science & Technology
Chemistry
Science & Technology - Other Topics
LIGNOCELLULOSIC ETHANOL-PRODUCTION
TECHNOECONOMIC ANALYSIS
LIGNIN
HYDROLYSIS
CELLULOSE
BIOMASS
PINE
DISSOLUTION
EXTRACTION
HARDWOOD
Organic Chemistry
03 Chemical Sciences
Publication Status: Published
Embargo Date: 2020-01-14
Online Publication Date: 2019-01-14
Appears in Collections:Faculty of Engineering
Chemistry
Centre for Environmental Policy
Chemical Engineering
Faculty of Natural Sciences



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