Catalytic Strategies for Converting Lignocellulosic Carbohydrates to Fuels and Chemicals

Bond, Jesse Q.; Alonso, David Martín; Dumesic, James A.

doi:10.1002/9780470975831.ch5

Cited by 8 publications

(9 citation statements)

References 223 publications

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“…The high degree of crystallinity of celluloses and the lignin shield around them is one of the major causes for the recalcitrance of lignocellulosic materials towards enzymatic digestion (Hayashi and Kaida, 2011;Hill, 2006). The intercalation of hemicelluloses into cellulose microfibrils and their interlinkage with lignin is another important factor for such recalcitrance (Bond et al, 2013;Yang et al, 2011). Thus, aside from loosening up the structural rigidity of celluloses and breaking up the lignin shield, the removal of hemicelluloses from the lignocellulosic matrix forms an essential part of biomass pretreatment for enhanced cellulose digestibility (Yan et al, 2016;Hayashi and Kaida, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…However, hemicelluloses are thermally so labile that their extraction in oligomeric and polymeric forms typically requires a milder set of pretreatment conditions than those required for enhanced cellulose digestibility (Bond et al, 2013;Tutt et al, 2012). With increased severity of pretreatment conditions there is increased decomposition of hemicelluloses, which in turn leads to increased formation of degradation products that have inhibitory effects on the downstream bio-catalytic action of enzymes and fermentation yeasts (Yang et al, 2011;Cardona et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the development of a biorefinery system meant for co-production of hemicellulosic biopolymers and cellulosic ethanol needs to take into account the potential operational challenges that primarily prevail at the pretreatment stage. Such challenges become even more evident when it comes to defining a single pretreatment step that can both remove hemicelluloses in oligo-and polymeric form and produce enzymatically digestible solids rich in cellulose (Bond et al, 2013;Trajano and Wyman, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Single-step microwave-assisted hot water extraction of hemicelluloses from selected lignocellulosic materials – A biorefinery approach

Mihiretu

Brodin

Chimphango

et al. 2017

Bioresource Technology

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The viability of single-step microwave-induced pressurized hot water conditions for co-production of xylan-based biopolymers and bioethanol from aspenwood sawdust and sugarcane trash was investigated. Extraction of hemicelluloses was conducted using microwave-assisted pressurized hot water system. The effects of temperature and time on extraction yield and enzymatic digestibility of resulting solids were determined. Temperatures between 170-200°C for aspenwood and 165-195°C for sugarcane trash; retention times between 8-22min for both feedstocks, were selected for optimization purpose. Maximum xylan extraction yields of 66 and 50%, and highest cellulose digestibilities of 78 and 74%, were attained for aspenwood and sugarcane trash respectively. Monomeric xylose yields for both feedstocks were below 7%, showing that the xylan extracts were predominantly in non-monomeric form. Thus, single-step microwave-assisted hot water method is viable biorefinery approach to extract xylan from lignocelluloses while rendering the solid residues sufficiently digestible for ethanol production.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Single-step microwave-assisted hot water extraction of hemicelluloses from selected lignocellulosic materials – A biorefinery approach

Mihiretu

Brodin

Chimphango

et al. 2017

Bioresource Technology

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“…The global market for LA, FA, and furfural are expected to grow at a compound annual growth rate (CAGR) of 5.7%, 4.9% and 11.6%, respectively. Formic acid reacts with alcohols and alkenes to produce formate esters, which may be applied as solvents, chemicals, or fuel additives . It is used principally as a preservative in the food industry.…”

Section: Introductionmentioning

confidence: 99%

“…Formic acid reacts with alcohols and alkenes to produce formate esters, which may be applied as solvents, chemicals, or fuel additives. 24 It is used principally as a preservative in the food industry. Furfural is used for the production of furfuryl alcohol, Modeling and Analysis: Techno-economic assessment in a pine sawdust biorefinery NM Clauser et al tetrahydro furfuryl alcohol, acetyl furane, furoic acid, methyl furane, and tetrahydrofuran (THF).…”

Section: Introductionmentioning

confidence: 99%

Techno‐economic assessment of carboxylic acids, furfural, and pellet production in a pine sawdust biorefinery

Clauser

Gutiérrez

Área

et al. 2018

Biofuels Bioprod Bioref

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Pine sawdust is an important lignocellulosic waste from the primary industrialization of wood, and its valorization using the biorefinery concept could add new value chains to the forest industry. Compared with large‐scale biorefineries, small‐scale ones involve lower capital and logistics costs, lower risk, and can increase the use of labor in rural areas. A scheme was proposed for the use of the hemicelluloses obtained from the spent liquor of a steam explosion pretreatment of pine sawdust. With the proposed scheme, levulinic acid (LA), formic acid (FA), acetic acid and furfural are obtained from the liquid fraction while pellets are produced from the solid fraction. This pine sawdust biorefinery allows about 747 kg of pellets, 57 kg of LA, 23 kg of FA, 18 kg of acetic acid, and 22 kg of furfural per 1000 kg of dry sawdust to be obtained. The energy used for LA production is one of the main production costs. When 95% of the residual solid is used to generate steam, there is an improvement in the internal rate of return (IRR). The heat integration allows a reduction of 10% in the steam consumption for LA, increasing the capacity for pellet production. The results obtained are therefore essential when seeking alternatives for pine sawdust biorefineries, focusing on the improvement of the production processes, satisfaction of energy requirements, and the reduction of the recovery costs. Three alternatives for the valorization of pine sawdust were analyzed and the best of them obtained an IRR of about 17%. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

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Synthese, motorische Verbrennung, Emissionen: Chemische Aspekte des Kraftstoffdesigns

et al. 2017

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Nachhaltig produzierte Biokraftstoffe, die auf Basis von Lignozellulose zugänglich sind, werden in Energieszenarien für Mobilität und Transport der Zukunft intensiv diskutiert. Traditionell konzentrieren sich die Forschungsaktivitäten in den Naturwissenschaften dabei auf den Syntheseprozess, während die anschließende Bewertung der Verbrennungseigenschaften anderen Forschungsgebieten überlassen wird. Dieser Aufsatz verfolgt mit der gemeinsamen Betrachtung der motorischen Verbrennung und der Kraftstoffsynthese einen integrativen Ansatz, bei dem die chemischen Aspekte im Vordergrund stehen. Dabei wird deutlich, dass das fundamentale Verständnis des Verbrennungsvorgangs maßgeblich dazu beitragen kann, Designkriterien für die Molekülstruktur möglicher Kraftstoffkandidaten abzuleiten, um so Ziele für die Analyse von Synthesewegen und die Entwicklung katalytischer Produktionswege zu definieren. Dieser integrative Ansatz des “Kraftstoffdesigns” umfasst die gesamte Kette der Energiekonversion ausgehend vom Rohstoff über Herstellungsprozess, Kraftstoff und Motor bis hin zur Schadstoffemission. Dies ermöglicht eine systematische Optimierung des Gesamtsystems mit dem Ziel, die Kohlenstoffbilanz zu verbessern, die Effizienz zu erhöhen und die Emissionen zu verringern.

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Catalytic Strategies for Converting Lignocellulosic Carbohydrates to Fuels and Chemicals

Cited by 8 publications

References 223 publications

Single-step microwave-assisted hot water extraction of hemicelluloses from selected lignocellulosic materials – A biorefinery approach

Single-step microwave-assisted hot water extraction of hemicelluloses from selected lignocellulosic materials – A biorefinery approach

Techno‐economic assessment of carboxylic acids, furfural, and pellet production in a pine sawdust biorefinery

Synthese, motorische Verbrennung, Emissionen: Chemische Aspekte des Kraftstoffdesigns

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