Hydrothermal pretreatment of lignocellulosic biomass

Ewanick, Shannon; Bura, Renata

doi:10.1533/9781845699611.1.3

Cited by 28 publications

(12 citation statements)

References 80 publications

(84 reference statements)

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“…Therefore, optimization of the hydrolytic process in terms of the monomers and oligomers yielded has been studied by several researchers for its use in the food and chemical industries [73]. In general, hydrolysis of a biomass using subcritical water (temperatures of 150°C < T < 374°C and pressures of P > Psat) for a few minutes causes the depolymerization of hemicellulose and starch, the partial depolymerization of cellulose and the improved susceptibility of the crystalline cellulose fraction to subsequent hydrolysis [36], [74]. Supercritical hydrolysis of a biomass (T > 374°C, P > 22.1 MPa) causes the depolymerization of the crystalline cellulose and the separation of the hydrolytic products of lignin [73].…”

Section: Hydrothermal Treatment Of Cellulose Hemicellulose and Starcmentioning

confidence: 99%

Obtaining Oligo- and Monosaccharides from Agroindustrial and Agricultural Residues Using Hydrothermal Treatments

Cárdenas‐Toro¹,

Alcázar-Alay²,

Forster‐Carneiro³

et al. 2014

fph

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Agricultural and agroindustrial residues are major sources of cellulose, hemicellulose, and starch that can be converted into bioactive compounds, such as oligosaccharides and monosaccharides, using various chemical and biological methods. These bioactive compounds can be used as raw materials by food, cosmetic and pharmaceutical industries, as well as in the production of intermediate products and the development of biomaterials by chemical industries. In Brazil, the major industrial residues, which are corn residues, soybean residues, sugarcane bagasse, palm and coconut fibers, and grape and tomato seeds, among others, are produced at a rate of approximately of 600 million tons per year. Thus, the utilization of these residues using sustainable technology is of great interest. Hydrothermal treatment is a green technology that includes autohydrolysis as well as subcritical and supercritical hydrolysis, in which water is used at high pressures and temperatures to recover polysaccharides from complex vegetal matrices. The hydrolytic mechanisms can be improved by changing the ionic product or the polarity and electrical conductivity of water in subcritical and supercritical states. These properties promote the selective dissolution of the starch, hemicellulose and cellulose in the residues. The conversion of starch and hemicellulose into oligosaccharides and monosaccharides is preferentially performed at temperatures of less than 200°C. In contrast, the conversion of cellulose into oligosaccharides is promoted at temperatures greater than 200°C, with the highest amount oligosaccharide formation occurring at close to the critical point. In this article, the main biomass components, the properties of water under subcritical and supercritical conditions, and the latest studies of polysaccharide conversion in biomasses using hydrothermal treatments are reviewed.

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Section: Hydrothermal Treatment Of Cellulose Hemicellulose and Starcmentioning

confidence: 99%

Obtaining Oligo- and Monosaccharides from Agroindustrial and Agricultural Residues Using Hydrothermal Treatments

Cárdenas‐Toro¹,

Alcázar-Alay²,

Forster‐Carneiro³

et al. 2014

fph

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“…Chipped willow enters the facility and undergoes sulfur dioxide catalyzed steam explosion pretreatment. Steam explosion was selected because it will result in a somewhat higher glucose yield with reduced fermentation inhibitor production than other pretreatment methods (Ewanick and Bura 2010). Endo-b-1,4-glucanase, cellobiohydrolase, and b-glucosidase are used for enzymatic hydrolysis, and Zymomonas mobilis is assumed to be the fermentation organism.…”

Section: Data Collectionmentioning

confidence: 99%

Life-Cycle Assessment for the Production of Bioethanol from Willow Biomass Crops via Biochemical Conversion*

Budsberg¹,

Rastogi²,

Puettmann³

et al. 2012

Forest Products Journal

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We conducted a life-cycle assessment (LCA) of ethanol production via bioconversion of willow biomass crop feedstock. Willow crop data were used to assess feedstock production impacts. The bioconversion process was modeled with an Aspen simulation that predicts an overall conversion yield of 310 liters of ethanol per tonne of feedstock (74 gal per US short ton). Vehicle combustion impacts were assessed using Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation (GREET) models. We compared the impacts of bioconversion-produced ethanol with those of gasoline on an equivalent energy basis. We found that the life-cycle global warming potential of ethanol was slightly negative. Carbon emissions from ethanol production and use were balanced by carbon absorption in the growing willow feedstock and the displacement of fossil fuel-produced electricity with renewable electricity produced in the bioconversion process. The fossil fuel input required for producing 1 MJ of energy from ethanol was 141 percent less than that from gasoline. More water was needed to produce 1 MJ of ethanol fuel than 1 MJ of gasoline. The life-cycle water use for ethanol was 169 percent greater than for gasoline. The largest contributors to water use were the conversion process itself and the production of chemicals and materials used in the process, such as enzymes and sulfuric acid. The authors are, respectively, Masters Student, College of the Environment, School of Environmental and Forest Sci., Univ. of Washington, Seattle (budsberg@uw.edu); Masters Student, College of the Environment, School of Environmental and Forest Sci., Univ. of Washington,

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“…Образцы древесины подвергались баротермическому воздействию перегретого насыщенного водяного пара методом взрывного автогидролиза в лабораторном реакторе периодического действия, который традиционно используется для обработки предварительно измельченных лигноцеллюлозных материалов в целях получения на их основе целлюлозы, топливных гранул, биоэтанола, животных кормов и др. [28,29,34]. В данном случае обработке подвергались образцы цельной древесины.…”

Section: объекты и методы исследованияunclassified

Physical and Mechanical Characteristics of a Pine Thermowood Composition during Barothermal Treatment

Skurydin¹,

Skurydina²,

Сафин³

et al. 2021

Lesnoy Zhurnal (Forestry Journal)

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The studies are aimed at forming ideas on the structure and properties of composite materials obtained from pine wood and the processes occurring in the structure of wood tissue. The article presents the data on the influence of the conditions of barothermal treatment of pine wood samples by the method of explosive autohydrolysis on the properties of a thermowood composition. The composite material is obtained by hot pressing. The influence on density, strength and hydrophobic characteristics was studied. A series of samples was made under different conditions of the explosive autohydrolysis rigidity factor; at a temperature of 200 °C and the process duration from 0.08 to 10 min. All samples of composite material were obtained without the use of additional components. It was found that the increase in the hydrolysis rigidity factor leads to a decrease in the density of hydrolyzed wood from 440 to ~350 kg/m3. There is no fragmentation of wood samples with the selected processing parameters. Hot pressing of hydrolyzed wood obtained under conditions of low or moderate rigidity is accompanied by a linear increase in the density of the thermowood composite material from ~440 to 500 kg/m3. The consequence of a further increase in the rigidity factor is a slowdown in the rate of increase in the density of the composite material. The conditional boundary that determines the achievement of the maximum number of cross-linked intermolecular structures in the composite material corresponds to the rigidity factor of 3000–4500 min. More rigid processing conditions cause intensification of thermal degradation processes. The dependence of hydrophobic characteristics on the rigidity of the barothermal treatment conditions is complex. At the rigidity factor of 1000–3000 min, an extreme point is observed, before which the hydrophobic properties of the material deteriorate. Its water absorption and swelling increase from 50 to 130 % and from 15 to 54 %, respectively. The hydrophobic performance is significantly improved after reaching the extreme point. Water absorption and swelling reduce to ~20 % and ~10 %, respectively. Mild hydrolysis conditions do not result in a material with consistently high hydrophobic properties. The cross-linked structures are not enough to form a strong and water-resistant composition, and as a consequence, the hydrophobic characteristics deteriorate. Increasing the value of the hydrolysis rigidity factor increases the number of active components. Additional intermolecular bonds formed during pressing improve hydrophobic characteristics. The obtained results can be used in the creation of models of processes occurring in the structure of lignocellulose substance during explosive autohydrolysis and in the preparation of composite materials based on it. Optimal parameters of barothermal treatment for obtaining composite materials with specified physical and mechanical characteristics can be determined. Barothermal treatment of solid pine wood by explosive autohydrolysis contributes to the occurrence of chemically active components in the structure of wood tissue. Their number depends on the rigidity of the processing conditions. The properties of the resulting thermowood composition depend on the conditions of explosive autohydrolysis.

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Hydrothermal pretreatment of lignocellulosic biomass

Cited by 28 publications

References 80 publications

Obtaining Oligo- and Monosaccharides from Agroindustrial and Agricultural Residues Using Hydrothermal Treatments

Obtaining Oligo- and Monosaccharides from Agroindustrial and Agricultural Residues Using Hydrothermal Treatments

Life-Cycle Assessment for the Production of Bioethanol from Willow Biomass Crops via Biochemical Conversion*

Physical and Mechanical Characteristics of a Pine Thermowood Composition during Barothermal Treatment

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