Sugarcane and Woody Biomass Pretreatments for Ethanol Production

Silva, Ayla Sant’Ana da; Teixeira, Ricardo Sposina Sobral; Moutta, Rondinelede Oliveira; Ferreira-Leitão, Viridiana Santana; Barros, Rodrigo daRocha Olivieri de; Ferrara, Maria Antonieta; Bon, Elba Pinto daSilva

doi:10.5772/53378

Cited by 22 publications

(14 citation statements)

References 146 publications

(198 reference statements)

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“…Hundreds of millions of tons of woody biomass, accounting for 30% of the total biomass projected to be available for biofuel, can be sustainably available in various regions of the world such as United States, Scandinavia, New Zealand, Canada, Japan and South America da Silva et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Enzymatic hydrolysis of biomass from wood

Álvarez

Reyes-Sosa

Dı́ez

2016

Microbial Biotechnology

197

104

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SummaryCurrent research and development in cellulosic ethanol production has been focused mainly on agricultural residues and dedicated energy crops such as corn stover and switchgrass; however, woody biomass remains a very important feedstock for ethanol production. The precise composition of hemicellulose in the wood is strongly dependent on the plant species, therefore different types of enzymes are needed based on hemicellulose complexity and type of pretreatment. In general, hardwood species have much lower recalcitrance to enzymes than softwood. For hardwood, xylanases, beta‐xylosidases and xyloglucanases are the main hemicellulases involved in degradation of the hemicellulose backbone, while for softwood the effect of mannanases and beta‐mannosidases is more relevant. Furthermore, there are different key accessory enzymes involved in removing the hemicellulosic fraction and increasing accessibility of cellulases to the cellulose fibres improving the hydrolysis process. A diversity of enzymatic cocktails has been tested using from low to high densities of biomass (2–20% total solids) and a broad range of results has been obtained. The performance of recently developed commercial cocktails on hardwoods and softwoods will enable a further step for the commercialization of fuel ethanol from wood.

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Section: Introductionmentioning

confidence: 99%

Enzymatic hydrolysis of biomass from wood

Álvarez

Reyes-Sosa

Dı́ez

2016

Microbial Biotechnology

197

104

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“…The use of conversion technologies to separate biomass into their building blocks and their subsequent transformation into value‐added products, biofuels, and chemicals in an industrial scale is known as a biorefinery, in an analogy to the petroleum refinery . Within this concept, hexoses (C6 sugars, mainly glucose) could be fermented into ethanol using conventional micro‐organisms, while pentoses (C5 sugars, mainly xylose) could be used for the production of a wide range of chemicals with higher added value . The conventional Brazilian sugarcane mill can be considered as an example of a biorefinery, since ethanol, sugar, and electricity, among other products, are produced from biomass.…”

Section: Introductionmentioning

confidence: 99%

Process development and techno‐economic analysis of bio‐based succinic acid derived from pentoses integrated to a sugarcane biorefinery

Klein

Silva

Junqueira

et al. 2017

Biofuels Bioprod Bioref

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Bio‐based succinic acid is a potential building block for the production of renewable chemicals and polymers. The use of hemicellulosic hydrolyzate from sugarcane bagasse allows production of succinic acid without competing with food chains and increasing the biomass ‐aggregated value. This work assesses the economic impacts of integrating the production of ‐succinic acid on an optimized sugarcane biorefinery with the production of first‐generation ethanol and electricity. Process simulation was performed to obtain mass and energy balances of the entire process, from bagasse pre‐treatment to pentose fermentation and succinic acid recovery, using several pieces of technical information and data taken from the scientific literature. After ‐assessing the impacts of key economic variables through risk analysis, the obtained results were benchmarked against those of an optimized ethanol distillery. Calculated succinic acid production cost was US$ 2.32/kg, comparable to costs related to less expensive sugar sources. The integrated succinic acid biorefinery presented a slightly lower internal rate of return (IRR) compared to an ‐ethanol distillery. However, even when considering uncertainties, succinic acid production has a strong probability (84.6%) of achieving an IRR higher than 12%. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd

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“…In addition, non‐aqueous methods such as microwave treatment have been found to effectively increase the susceptibility of biomass to digestion . The application of these techniques in a large‐scale biorefining platform is plagued by a wide array of cost, health, and sustainability issues . These process limitations have resulted in research emphasis on cheaper, sustainable, non‐derivatizing pre‐treatment methods which efficiently disintegrate the naturally well‐organized cell wall matrix of lignocellulosic biomasses at milder process conditions .…”

Section: Introductionmentioning

confidence: 99%

Effect of water of crystallization on the dissolution efficiency of molten zinc chloride hydrate salts during the pre‐treatment of corncob biomass

Awosusi

Adeleke

Ayeni

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND: Agro-wastes albeit abundant and cheap, require pre-treatment steps tailored to overcome the characteristic recalcitrance of lignocellulosic biomass. In this study, zinc chloride hydrate salts were studied for their biomass deconstruction potential. The role of salts' hydration and to what degree it affects the dissolution efficiency was evaluated. Milled corn cobs from local farmlands were dissolved in the following solvent systems; ZnCl 2 .3H 2 O, ZnCl 2 .4H 2 O, ZnCl 2 .5H 2 O and ZnCl 2 .7H 2 O at 70 ∘ C for 60 mins at a biomass to solvent ratio of 1:12. RESULTS: The difference between the least and most hydrated solvent systems in terms of total released sugars as a percentageof recoverable sugar is 70.1%. The ZnCl 2 .4H 2 O solvent system extracted up to 49.1% of glucose and 95% of xylose. There were significant differences in the crystallinity indices and surface morphologies between the untreated and treated biomass. CONCLUSION: The findings as documented contribute to current insights on the mechanisms of disintegration of lignocellulosic biomass in molten hydrate salts. The extraction of sugar components of biomass by ZnCl 2 .4H 2 O solvation was about 43% glucan and 99% xylan.

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Sugarcane and Woody Biomass Pretreatments for Ethanol Production

Cited by 22 publications

References 146 publications

Enzymatic hydrolysis of biomass from wood

Enzymatic hydrolysis of biomass from wood

Process development and techno‐economic analysis of bio‐based succinic acid derived from pentoses integrated to a sugarcane biorefinery

Effect of water of crystallization on the dissolution efficiency of molten zinc chloride hydrate salts during the pre‐treatment of corncob biomass

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