Comparison of the susceptibility of two hardwood species, Mimosa scabrella Benth and Eucalyptus viminalis labill, to steam explosion and enzymatic hydrolysis

Ramos, Luiz Pereira; Carpes, Solange Teresinha; Silva, F. T.; Ganter, J.L.M.S

doi:10.1590/s1516-89132000000200009

Cited by 13 publications

(6 citation statements)

References 17 publications

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“…This was apparent from all pretreatment variables including the overall recovery yields, glucose and xylose recovery in the water-solubles, yield of dehydration by-products and lignin susceptibility to acid hydrolysis 107 . In general, addition of dilute H 2 SO 4 as an acid catalyst increased the recovery yield of fermentable sugars in the water-soluble fractions and this effect was more pronounced when pretreatment was carried out with bracatinga chips.…”

Section: Phenolic Hydroxyl Groups Are Generated By Acid Hydrolysis (Amentioning

confidence: 95%

“…Due to its morphological characteristics and structural properties, sapwood has a higher porosity than heartwood and is generally more permeable to chemical impregnation and steam. Indeed, chips derived from 6-8 year-old stems of Populus tremuloides 23 , poplar hybrids 50 , E. grandis 90 , E. viminalis 26,107 and Mimosa scabrella Benth (bracatinga) 107 were shown to be highly amenable to steam pretreatment and subsequent fractionation. Water and alkali extraction removed most of the hemicellulose and lignin originally present in the wood chips, resulting in a cellulosic residue that could be readily hydrolysed to glucose.…”

Section: Phenolic Hydroxyl Groups Are Generated By Acid Hydrolysis (Amentioning

confidence: 99%

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The chemistry involved in the steam treatment of lignocellulosic materials

Ramos¹

2003

Quím. Nova

540

217

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Recebido em 16/8/02; aceito em 15/5/03Pretreatment of lignocellulosic materials is essential for bioconversion because of the various physical and chemical barriers that greatly inhibit their susceptibility to bioprocesses such as hydrolysis and fermentation. The aim of this article is to review some of the most important pretreatment methods developed to date to enhance the conversion of lignocellulosics. Steam explosion, which precludes the treatment of biomass with high-pressure steam under optimal conditions, is presented as the pretreatment method of choice and its mode of action on lignocellulosics is discussed. The optimal pretreatment conditions for a given plant biomass are defined as those in which the best substrate for hydrolysis is obtained with the least amount of soluble sugars lost to side reactions such as dehydration. Therefore, pretreatment optimization results from a compromise between two opposite trends because hemicellulose recovery in acid hydrolysates can only be maximized at lower pretreatment severities, whereas the development of substrate accessibility requires more drastic pretreatment conditions in which sugar losses are inevitable. To account for this heterogeneity, the importance of several process-oriented parameters is discussed in detail, such as the pretreatment temperature, residence time into the steam reactor, use of an acid catalyst, susceptibility of the pretreated biomass to bioconversion, and process design.

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Section: Phenolic Hydroxyl Groups Are Generated By Acid Hydrolysis (Amentioning

confidence: 95%

Section: Phenolic Hydroxyl Groups Are Generated By Acid Hydrolysis (Amentioning

confidence: 99%

The chemistry involved in the steam treatment of lignocellulosic materials

Ramos¹

2003

Quím. Nova

540

217

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“…These are steam explosion, alkali washing, dilute acid hydrolysis, ammonia fiber expansion, liquid hot water and wet oxidation, etc. (Glasser and Wright 1997;Ramos et al 1992Ramos et al , 2000Martín et al 2007;Zhang et al 2007;Balat et al 2008;Hernández-Salas et al 2009;Hendriks and Zeeman 2009).…”

Section: Pretreatment Strategies For Delignification Of Sugarcane Bagmentioning

confidence: 99%

Pretreatment strategies for delignification of sugarcane bagasse: a review

Karp

Woiciechowski

Soccol

et al. 2013

Braz. arch. biol. technol.

143

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The valorization of agro-residues by biological routes is a key technology that contributes to the development of sustainable processes and the generation of value-added products. Sugarcane bagasse is an agro-residue generated by the sugar and alcohol industry in Brazil (186 million tons per year), composed essentially of cellulose (32-44%), hemicellulose (27-32%) and lignin (19-24%). The conversion of sugarcane bagasse into fermentable sugars requires essentially two steps: pretreatment and hydrolysis. The aim of the pretreatment is to separate the lignin and break the structure of lignocellulose, and it is one of the most critical steps in the process

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“…8 Pretreatment with sulfuric acid-catalyzed explosion has been successfully demonstrated for eucalyptus biomass at laboratory-and pilot-scale with glucan digestibilities in excess of 80% recorded. [9][10][11][12] Moreover, in a biorefinery context, the use of acid catalysts may be advantageous in that xylan fractions are generally recoverable as monomeric xylose, which can further contribute to the production of ethanol or other value-added compounds like xylitol. 13 The processing strategies for the generation of monosaccharides from lignocellulosic substrates and transformation via fermentation into ethanol can be achieved in a two-stage sequential step in the case of separate hydrolysis and fermentation (SHF), or in a combined simultaneous saccharification fermentation (SSF) configuration.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Saccharification and Fermentation of PretreatedEucalyptus grandisUnder High Solids Loading

McIntosh

Palmer

Zhang

et al. 2017

Industrial Biotechnology

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Whole Eucalyptus grandis trees (including bark, branches and leaves) were investigated as a potential feedstock for bioethanol production. To demonstrate and maximize ethanol production, unwashed steam exploded wood chips (SEWC) were used as substrates in high solids load simultaneous saccharification fermentations (SSF) with an industrial Saccharomyces cerevisiae strain (Fali Ò ). Under optimized SSF conditions-20 wt% solids, 60 filter paper units (FPU)/g glucan, and 36°C-ethanol titer and glucan-to-ethanol yields of 56 g/L and 90%, respectively, were achieved. Raising the SSF temperature to 39°C showed no observable benefit in final ethanol titers and/or yields. Addition of 3 wt% polyethylene glycol (PEG) further increased final ethanol titers and yields to 60 g/L and 95%, respectively, at a 30% lower cellulase dosage. Considering the mass balance of the best-performing SSF (20 wt% SEWC, 40 FPU Ctec 2/g glucan, 30 mg PEG/g dry solid at 36°C) process, the maximum ethanol attainable was estimated at 187 kg (85.8% yield) and 299 kg (95% yield) per dry metric ton of original and SEWC biomass, respectively.

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Comparison of the susceptibility of two hardwood species, Mimosa scabrella Benth and Eucalyptus viminalis labill, to steam explosion and enzymatic hydrolysis

Abstract: ABSTRACT

Cited by 13 publications

References 17 publications

The chemistry involved in the steam treatment of lignocellulosic materials

The chemistry involved in the steam treatment of lignocellulosic materials

Pretreatment strategies for delignification of sugarcane bagasse: a review

Simultaneous Saccharification and Fermentation of PretreatedEucalyptus grandisUnder High Solids Loading

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