Influence of ionic-liquid incubation temperature on changes in cellulose structure, biomass composition, and enzymatic digestibility

Barr, Chris; Hanson, B. Leif; Click, Kevin A.; Perrotta, Grace; Schall, Constance A.

doi:10.1007/s10570-013-0052-y

Cited by 15 publications

(9 citation statements)

References 35 publications

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“…IL pretreatment has the ability to significantly de‐crystallize cellulose, simultaneously disrupt the lignin and hemicellulose network, and decrease the enzyme load required for hydrolysis . Under different conditions, the average fermentable sugars yield with IL pretreatment of corn stover, switchgrass and poplar were 53.8, 53.4, 51.3 g/100 g, respectively . Among those feedstocks, corn stover was the most commonly available feedstock in the USA.…”

Section: Introductionmentioning

confidence: 99%

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Techno‐economic analysis of cellulose dissolving ionic liquid pretreatment of lignocellulosic biomass for fermentable sugars production

Baral

Shah

2015

Biofuels Bioprod Bioref

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Pretreatment of biomass is essential to produce fermentable sugars, which can be further transformed into biofuels. Most of the common pretreatment methods, including sulfuric acid pretreatment, lead to low sugar yields and high microbial inhibitors formation, and require an additional detoxification step prior to fermentation. Ionic liquid (IL) pretreatment has the potential to reduce or eliminate these problems, and, thus, recently, has gained significant attention as an alternative pretreatment technology. However, before commercial deployment, IL pretreatment requires a thorough assessment of its techno‐economic feasibilities and bottlenecks. Thus, the main objective of this study was to assess the techno‐economic feasibility of a commercial‐scale IL pretreatment for a 113 million liter/year (30 million gal/year) cellulosic biorefinery and identify operational targets for process improvement. 1‐ethyl‐3‐methylimidazolium acetate IL was used for analyses, which is one of the mostly investigated ILs and is currently best at dissolving the lignocellulosic biomass. Corn stover, poplar, and switchgrass were used as the model feedstock. Input data were obtained from recent literatures on IL pretreatment of these feedstocks. Estimated sugar production costs ($/kg) from corn stover, switchgrass and poplar were 2.7, 3.2, and 3.0, respectively. IL recovery was identified to be the most sensitive parameter followed by IL cost and heat recovery. Furthermore, for IL pretreatment to be economically competitive with sulfuric acid pretreatment, >97% IL recovery, ≤$1/kg IL cost, and >90% waste heat recovery are necessary, all of which are very optimistic considerations at the present state of technology, thus requires further research and development efforts. © 2015 Society of Chemical Industry and John Wiley & Sons, Ltd

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Section: Introductionmentioning

confidence: 99%

“…Schematic of IL pretreatment process summarizing different model conditions. The process parameters were obtained from previous studies . Feedstock and products percentages are based on dry weight ratio, and other process parameters percentages are based on wet weight ratio.…”

Section: Introductionmentioning

confidence: 99%

Techno‐economic analysis of cellulose dissolving ionic liquid pretreatment of lignocellulosic biomass for fermentable sugars production

Baral

Shah

2015

Biofuels Bioprod Bioref

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“…For lignocellulosic substrates, the process is complicated by the presence of lignin, and partial recrystallization to either cellulose II or back to cellulose I can occur (Cheng et al, ; Samayam et al, ). This may depend on the severity of the ionic liquid pretreatment, and whether the cellulose I is completely dissolved or merely swollen by the pretreatment (Barr et al, ; Lucas et al, ; Samayam et al, ).…”

Section: Resultsmentioning

confidence: 99%

“…Several studies on other biomass feedstocks have implicated delignification and reduction in cellulose crystallinity as key factors in the effectiveness of ionic liquid pretreatment (Fu et al, ; Lee et al, , Li et al, ; Yuan et al, ). Delignification can be followed by wet chemistry and spectroscopic techniques, and changes in cellulose crystallinity by wide‐angle X‐ray scattering (WAXS) and solid state cross polarization/magic‐angle spinning (CP/MAS) 13 C NMR spectroscopy (Barr et al, ; Cheng et al, ; Doherty et al, ; Lee et al, ).…”

Section: Introductionmentioning

confidence: 99%

Structural features affecting the enzymatic digestibility of pine wood pretreated with ionic liquids

Torr

Love

Simmons

et al. 2015

Biotech & Bioengineering

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Pretreating lignocellulosic biomass with certain ionic liquids results in structural and chemical changes that make the biomass more digestible by enzymes. In this study, pine wood was pretreated with 1-ethyl-3-methylimidazolium chloride/acetate ([C2 mim]Cl and [C2 mim][OAc]) at different temperatures to investigate the relative importance of substrate features, such as accessible surface area, cellulose crystallinity, and lignin content, on enzymatic digestibility. The ionic liquid pretreatments resulted in glucan conversions ranging from 23% to 84% on saccharification of the substrates, with [C2 mim][OAc] being more effective than [C2 mim]Cl. The pretreatments resulted in no delignification of the wood, some loss of cellulose crystallinity under certain conditions, and varying levels of increased surface area. Enzymatic digestibility closely correlated with accessible surface area and porosity measurements obtained using Simons' staining and thermoporosimetry techniques. Increased accessible surface area was identified as the principal structural feature responsible for the improved enzymatic digestibility.

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“…Structural composition was gathered from previous studies; and their conversion rates were obtained from NREL recent study …”

Section: Methodsmentioning

confidence: 99%

Supply and value chain analysis of mixed biomass feedstock supply system for lignocellulosic sugar production

Baral

Davis

Bradley

2019

Biofuels Bioprod Bioref

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The sustainable supply of high‐quality, low‐cost biomass feedstock to cellulosic biorefineries is still a challenge. Utilizing corn stover as the single feedstock to a biorefinery also poses a source of risk to seasonal feedstock availability, affordability, and sustainability. Implementing a year‐round feedstock switching strategy or utilizing an optimal mixture of corn stover, miscanthus, and switchgrass is demonstrated to diminish these concerns while reducing the cost of sugar production by as much as 3.8% and 13.6%, respectively, when compared to a baseline sugar price of 441.9 $ metric ton−1 (t) attributed to a fixed corn stover feedstock basis. This study determines that a mixing ratio of corn stover, miscanthus, and switchgrass of 36%, 50%, and 14%, respectively, minimizes the selling price of sugar. If miscanthus is sufficiently available in the future, its fraction could be further increased to 70% by reducing the fraction of corn stover. We find that the mixed feedstock considered in this study reduces the nutrient replacement and feedstock transportation costs and improves the quality of feedstock (determined by total carbohydrates and ash) relative to corn stover alone. Results suggest that a high‐quality feedstock with a high carbohydrate content is an important metric for consideration, beyond strictly the feedstock cost, to reduce the selling price of sugar and its uncertainties. In the future this may be supported by the increased availability of higher carbohydrate feedstocks such as miscanthus. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Influence of ionic-liquid incubation temperature on changes in cellulose structure, biomass composition, and enzymatic digestibility

Cited by 15 publications

References 35 publications

Techno‐economic analysis of cellulose dissolving ionic liquid pretreatment of lignocellulosic biomass for fermentable sugars production

Techno‐economic analysis of cellulose dissolving ionic liquid pretreatment of lignocellulosic biomass for fermentable sugars production

Structural features affecting the enzymatic digestibility of pine wood pretreated with ionic liquids

Supply and value chain analysis of mixed biomass feedstock supply system for lignocellulosic sugar production

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