Pretreatment: The key to efficient utilization of lignocellulosic materials

Galbe, Mats; Zacchi, Guido

doi:10.1016/j.biombioe.2012.03.026

Cited by 381 publications

(270 citation statements)

References 38 publications

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“…Pretreatments have been considered for a long time as the key to take the biochemical conversion of biomass to levels which are compatible with industrial applications [11]. A great deal of research has been put into the development of different pretreatments over the last 10 years, and the literature is rich in diverse and creative approaches to increase the efficiency of pretreatments in terms of increased fuel production after fermentation ( [12] and references therein). An interesting new approach is to evaluate pretreatments in terms of their potential for the cogeneration of value-added chemicals in addition to their ability to potentiate enzymatic hydrolysis [13].…”

Section: Introductionmentioning

confidence: 99%

Side by Side Comparison of Chemical Compounds Generated by Aqueous Pretreatments of Maize Stover, Miscanthus and Sugarcane Bagasse

et al. 2014

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In order to examine the potential for coproduct generation, we have characterised chemical compounds released by a range of alkaline and acidic aqueous pretreatments as well as the effect of these pretreatments on the saccharification ability of the lignocellulosic material. Comparative experiments were performed using three biomass types chosen for their potential as second-generation biofuel feedstocks: maize stover, miscanthus and sugarcane bagasse. The release of lignin from the feedstock correlated with the residual biomass saccharification potential, which was consistently higher after alkaline pretreament for all three feedstock types.Alkaline pretreatment released more complex mixtures of pentose and hexose sugars into the pretreatment liquor than did acid pretreatment. In addition, complex mixtures of aromatic and aliphatic compounds were released into pretreatment liquors under alkaline conditions, in a temperaturedependent manner, but far less so under acidic conditions. We show that the three feedstocks characterised interact with the pretreatment conditions in a specific manner to generate different ranges of products, highlighting the need to tailor pretreatments to both the starting feedstock and desired outcomes.

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Section: Introductionmentioning

confidence: 99%

Side by Side Comparison of Chemical Compounds Generated by Aqueous Pretreatments of Maize Stover, Miscanthus and Sugarcane Bagasse

et al. 2014

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“…There are several different techniques for pretreatment of lignocellulose [4][5][6][7]. These include acid-based methods, methods working close to neutral conditions, mild alkaline pretreatment, pulping processes, and the use of alternative solvents.…”

Section: Introductionmentioning

confidence: 99%

“…These include acid-based methods, methods working close to neutral conditions, mild alkaline pretreatment, pulping processes, and the use of alternative solvents. Dilute-acid pretreatment is known to be efficient also for recalcitrant feedstocks, such as softwood [4,7]. Acid pretreatment primarily degrades hemicellulosic polysaccharides, which makes the cellulose more accessible for cellulolytic enzymes.…”

Section: Introductionmentioning

confidence: 99%

“…Comparisons of pretreatment methods suggest that acid hydrolysis and steam pretreatment with acid catalysts are Electronic supplementary material The online version of this article (doi:10.1007/s12155-015-9698-7) contains supplementary material, which is available to authorized users. methods that can be used for all types of raw materials [4,7]. Acid pretreatment has also been thoroughly tested in pilot and demonstration scale.…”

Section: Introductionmentioning

confidence: 99%

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Biochemical Conversion of Torrefied Norway Spruce After Pretreatment with Acid or Ionic Liquid

et al. 2015

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The chemical effects of torrefaction and the possibility to combine torrefaction with biochemical conversion were explored in experiments with five preparations of wood of Norway spruce that had been torrefied using different degrees of severity. Compositional analysis and analyses using solid-state CP/MAS 13 C NMR, Fourier-transform infrared (FTIR) spectroscopy, and Py-GC/MS showed small gradual changes, such as decreased hemicellulosic content and increased Klason lignin value, for torrefaction conditions in the range from 260°C and 8 min up to 310°C and 8 min. The most severe torrefaction conditions (310°C, 25 min) resulted in substantial loss of glucan and further increase of the Klason lignin value, which was attributed to conversion of carbohydrate to pseudo-lignin. Even mild torrefaction conditions led to decreased susceptibility to enzymatic hydrolysis of cellulose, a state which was not changed by pretreatment with sulfuric acid. Pretreatment with the ionic liquid (IL) 1-butyl-3-methylimidazolium acetate overcame the additional recalcitrance caused by torrefaction, and the glucose yields after 72 h of enzymatic hydrolysis of wood torrefied at 260°C for 8 min and at 285°C for 16.5 min were as high as that of ILpretreated non-torrefied spruce wood. Compared to ILpretreated non-torrefied reference wood, the glucose production rates after 2 h of enzymatic hydrolysis of IL-pretreated wood torrefied at 260°C for 8 min and at 285°C for 16.5 min were 63 and 40 % higher, respectively. The findings offer increased understanding of the effects of torrefaction and indicate that mild torrefaction is compatible with biochemical conversion after pretreatment with alternative solvents that disrupt pseudo-lignin-containing lignocellulose.

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“…There has been an increasing number of studies on the conversion of lignocellulose to fuel ethanol for many years due to a variety of reasons including renewable green energy sources, shortage of fossil fuels in a near or medium term future, reduction of greenhouse gas emission caused by utilization of fossil fuels, and so on (Galbe and Zacchi 2012;Huang et al 2009). Lignocellulosic biomass mainly consists of cellulose, hemicellulose, and lignin, which are connected with non-covalent and covalent bonds (Zhang et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Reuse of Enzymatic Hydrolyzed Residues from Sugarcane Bagasse to Cultivate Lentinula edodes

et al. 2013

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Pretreatment: The key to efficient utilization of lignocellulosic materials

Cited by 381 publications

References 38 publications

Side by Side Comparison of Chemical Compounds Generated by Aqueous Pretreatments of Maize Stover, Miscanthus and Sugarcane Bagasse

Side by Side Comparison of Chemical Compounds Generated by Aqueous Pretreatments of Maize Stover, Miscanthus and Sugarcane Bagasse

Biochemical Conversion of Torrefied Norway Spruce After Pretreatment with Acid or Ionic Liquid

Reuse of Enzymatic Hydrolyzed Residues from Sugarcane Bagasse to Cultivate Lentinula edodes

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