Hydrothermal pretreatment of several lignocellulosic mixtures containing wheat straw and two hardwood residues available in Southern Europe

Silva-Fernandes, Talita; Duarte, Luís C.; Carvalheiro, Florbela; Loureiro-Dias, Maria C.; Fonseca, César; Gı́rio, Francisco M.

doi:10.1016/j.biortech.2015.01.059

Cited by 41 publications

(35 citation statements)

References 32 publications

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“…Autohydrolysis provides several advantages, such as: i) high hemicellulose recoveries; ii) no catalyst is necessary; iii) no equipment corrosion problems are expected; iv) stages of sludge handling and acid recycling are avoided; v) enzymatic susceptibility of cellulose is improved [9]. The autohydrolysis reaction solubilizes selectively hemicellulose into oligosaccharides and promotes lower liberation of compounds derived from lignin and cellulose, as well as hemicellulose degradation products [12]. The main compounds found in the remaining solid fraction are cellulose and sulfur-free lignin.…”

Section: Introductionmentioning

confidence: 99%

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Comparative autohydrolysis study of two mixtures of forest and marginal land resources for co-production of biofuels and value-added compounds

et al. 2018

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This work was focused on evaluating two mixtures of lignocellulosic feedstock, forest and marginal land resources, in order to co-produce solid biofuel, oligosaccharides, and glucose under a biorefinery concept. The selection of renewable bio-mixtures was based on different criteria, namely, territorial distribution, fire risk during summer months and total sugar content. The two mixtures were submitted to autohydrolysis pretreatment under non-isothermal conditions (in the range of 190 C-240 C corresponding to severity of 3.71e4.82). Both mixtures were compared in terms of fractionation (cellulose and lignin recoveries and hemicellulose solubilization), analyzed for thermal properties (high heating values) and for enzymatic susceptibility of cellulose. The highest xylan recoveries (62 and 69%), as xylose and xylooligosaccharides, were achieved for both mixtures in the liquid phase at 206 C. Autohydrolysis pretreatment increased the high heating values of the two mixtures presenting an alternative use of solid fraction as solid biofuel. Moreover, enzymatic susceptibility of these pretreated mixtures was also improved from 45 to 90% of glucose yield by increasing pretreatment severity. This comparative study of autohydrolysis showed a suitable process for the valorization of both mixtures within a biorefinery concept.

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Section: Introductionmentioning

confidence: 99%

“…The main compounds found in the remaining solid fraction are cellulose and sulfur-free lignin. Cellulose can be subjected to enzymatic hydrolysis to produce glucose, an important input for biofuels [13] [12].…”

Section: Introductionmentioning

confidence: 99%

Comparative autohydrolysis study of two mixtures of forest and marginal land resources for co-production of biofuels and value-added compounds

et al. 2018

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“…In addition to optimizing the temperature, whose effect was already explored in batch systems [28,31], the liquid residence time for the extraction of hemicellulose from eucalyptus in a semi-continuous reactor was optimized in this work. Effects of the residence time were suddenly checked at temperature not normally suitable for the extraction of hemicellulose.…”

Section: Introductionmentioning

confidence: 99%

“…Agriculture wastes like wheat straw [20,21], corn stover [22,23] and rice straw [24,25] have been intensively explored for this kind of process, due to their abundance and easy availability. Also many woody biomass have been widely used [26][27][28], as they contain less inorganic substances than agricultural crops [29] and contain more acetyl groups that enhance the catalytic activity of the process (in particular hardwood species) [18].…”

Section: Introductionmentioning

confidence: 99%

Optimal conditions for hemicelluloses extraction from Eucalyptus globulus wood: hydrothermal treatment in a semi-continuous reactor

Gallina

Cabeza

Biasi

et al. 2016

Fuel Processing Technology

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Optimal conditions for hemicellulose extraction from wooden biomass in a semi-continuous system have been assessed in this work. This study would constitute the first stage for a profitable and green industrial process. Eucalyptus globulus was selected as raw material due to its low water consumption, high growth and its efficiency in lignocellulose production. Moreover its cultivation is very popular in southern Europe. Samples of 5.0 g of wood were fractioned using a pressurized hot water semicontinuous system, to produce sugars (pentoses and hexoses) and a solid residue enriched in lignin.Five flow rates between 2.50 and 20.00 mL/min and four temperatures between 135.0 and 285.0 ºC were tested in order to maximize the production of sugars, avoiding the formation of degradation products.Optimum conditions for the extraction of hemicellulose were identified at 185.0 ºC and 5.00 mL/min, leading to a pentoses yield of 67.409 wt%, with 0.702 wt% of degradation products. Almost all the pulp is extracted at 285.0 ºC. SEM images show very well the changes in the wood structure at different temperatures.A kinetic model was developed, describing the extraction and hydrolysis of hemicellulose and cellulose with absolute average deviations around 10 % for sugar extracted mass.

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“…Different pretreatments of lignocellulosics produce carbohydrates-and lignin-containing hydrolysates, which can be further converted into desired chemicals, biomaterials, or biofuels (Kamm and Kamm 2004;Sánchez and Cardona 2008;Alvira et al 2010;Chiaramonti et al 2012;Mood et al 2013;Silva-Fernandes et al 2015). In addition, using various pretreatments, it is possible to increase the reactivity of feedstock material, leading to enhanced pulping performance and recovery of potential by-streams (lignin and hydroxy acids) (Hendriks and Zeeman 2009;Kumar et al 2009;.…”

Section: Introductionmentioning

confidence: 99%

Chemical Pretreatments of Wood Chips Prior to Alkaline Pulping - A Review of Pretreatment Alternatives, Chemical Aspects of the Resulting Liquors, and Pulping Outcomes

Lehto

Alén

2015

BioResources

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The chemical industry is being forced to evaluate new strategies for more effective utilization of renewable feedstocks to diminish the use of fossil resources. In this literature review, the integration of both acidic and alkaline pretreatment phases of hardwood and softwood chips with chemical pulping is discussed. Depending on the pretreatment conditions, high-volume sulfur-free fractions with varying chemical compositions can be produced. In case of acidic pretreatments, the major products include carbohydrates (mono-, oligo-, and polysaccharides), whereas under alkaline (i.e., aqueous NaOH) pretreatment conditions, the sulfur-free fractions of aliphatic carboxylic acids, lignin, and extractives are primarily obtained. All these fractions are potentially interesting groups of compounds and can be used in a number of applications. Finally, the effects of pretreatments on pulping are also considered. Although it is believed that there are important advantages to be gained by integrating this type of renewable raw material-based production, in particular, with kraft pulping, sulfur-free pulping methods such as soda-AQ and oxygen/alkali delignification processes are also briefly discussed.

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Hydrothermal pretreatment of several lignocellulosic mixtures containing wheat straw and two hardwood residues available in Southern Europe

Cited by 41 publications

References 32 publications

Comparative autohydrolysis study of two mixtures of forest and marginal land resources for co-production of biofuels and value-added compounds

Comparative autohydrolysis study of two mixtures of forest and marginal land resources for co-production of biofuels and value-added compounds

Optimal conditions for hemicelluloses extraction from Eucalyptus globulus wood: hydrothermal treatment in a semi-continuous reactor

Chemical Pretreatments of Wood Chips Prior to Alkaline Pulping - A Review of Pretreatment Alternatives, Chemical Aspects of the Resulting Liquors, and Pulping Outcomes

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