Hydrothermal processing of lignocellulosic materials

Garrote, Gil; Domı́nguez, Herminia; Parajó, Juan Carlos

doi:10.1007/s001070050039

Cited by 740 publications

(477 citation statements)

References 56 publications

Supporting

Mentioning

436

Contrasting

Unclassified

Order By: Relevance

“…Heat treatment, such as the two-stage treatment method used in this study, causes a modification of the main components and changes the chemical composition of wood as described in previous studies [6,35,46,48] and by several other authors [4,10,13,16,37,39,41,43,44]. In the moist treatment stage, the hydro-thermolysis, hemicelluloses are depolymerized by hydrolysis reactions to oligomers and monomers.…”

Section: Discussionmentioning

confidence: 90%

“…max. 16 treatment resulted in a small reduction (3%) of the bending strength (MOR). The compressive strength parallel to the grain is clearly increased after heat treatment (28%).…”

Section: Resultsmentioning

confidence: 99%

“…Condensation reactions of such products probably result in repolymerization and it is thought that degradation products of hemicelluloses (e.g. furfural) are also involved [16]. This can result in new lignin based polymers [16] and/or in an increased cross-linking of the existing lignin network [4,13,43,48].…”

Section: Discussionmentioning

confidence: 99%

“…furfural) are also involved [16]. This can result in new lignin based polymers [16] and/or in an increased cross-linking of the existing lignin network [4,13,43,48]. The formation of a lignin-cellulose complex due to condensation reactions has also been suggested [27].…”

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Strength properties of thermally modified softwoods and its relation to polymeric structural wood constituents

Boonstra¹,

et al. 2007

View full text Add to dashboard Cite

-Thermal modification at relatively high temperatures (ranging from 150 to 260 • C) is an effective method to improve the dimensional stability and resistance against fungal attack. This study was performed to investigate the impact of heat treatment on the mechanical properties of wood. An industrially-used two-stage heat treatment method under relative mild conditions (< 200 • C) was used to treat the boards. Heat treatment revealed a clear effect on the mechanical properties of softwood species. The tensile strength parallel to the grain showed a rather large decrease, whereas the compressive strength parallel to the fibre increased after heat treatment. The bending strength, which is a combination of the tensile stress, compressive stress and shear stress, was lower after heat treatment. This decrease was less than the decrease of only the tensile strength. The impact strength showed a rather large decrease after heat treatment. An increase of the modulus of elasticity during the bending test has been noticed after heat treatment. Changes and/or modifications of the main wood components appear to be involved in the effects of heat treatment on the mechanical properties. The possible effect of degradation and modification of hemicelluloses, degradation and/or crystallization of amorphous cellulose, and polycondensation reactions of lignin on the mechanical properties of heat treated wood have been discussed. The effect of natural defects, such as knots, resin pockets, abnormal slope of grain and reaction wood, on the strength properties of wood appeared to be affected by heat treatment. Nevertheless, heat treated timber shows potential for use in constructions, but it is important to carefully consider the stresses that occur in a construction and some practical consequences when heat treated timber is used. thermal modification / mechanical properties / cellulose / hemicelluloses / lignin Résumé -Propriétés mécaniques de bois résineux modifiés par traitement thermique en relation avec la constitution en polymères ligneux structuraux. La modification thermique du bois à des températures relativement élevées (entre 150 et 260 • C) présente une méthode efficace pour améliorer la stabilité dimensionnelle et la résistance aux attaques de champignons. Ce travail porte sur les effets du traitement thermique sur les propriétés mécaniques du bois. Les planches ont été soumises à un traitement thermique à des températures relativement modérées (< 200 • C) selon un procédé industriel en deux phases. Il s'est avéré qu'un tel traitement influe nettement sur les propriétés mécaniques des bois résineux. La résistance à la traction dans la direction parallèle au fil du bois est diminuée de manière assez importante, tandis que, dans la même direction, la résistance à la compression est augmentée. La résistance au fléchissement, qui intègre la résistance aux efforts de traction, de compression et de cisaillement, était plus réduite après le traitement thermique. Cette diminution était moins importante que celle de la...

show abstract

Section: Discussionmentioning

confidence: 90%

“…max. 16 treatment resulted in a small reduction (3%) of the bending strength (MOR). The compressive strength parallel to the grain is clearly increased after heat treatment (28%).…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Strength properties of thermally modified softwoods and its relation to polymeric structural wood constituents

Boonstra¹,

et al. 2007

View full text Add to dashboard Cite

show abstract

“…It is accepted that the treatment is a key stage that determines the rest of the global biorefinery process. An ideal pretreatment must meet the following conditions: (1) simple and inexpensive operation, (2) facility to reduce particle size, (3) low energy, water and chemicals' consumption, (4) little corrosion, (5) capable to alter the lignocellulosic material (LCM) structure, (6) with low or no loss of polysaccharides, (7) production of large amounts of hemicelluloses' derivatives with high addedvalue production, (8) generation of low furfural, hydroxymethylfurfural, or phenolic acids (9) obtaining of solid residues with high cellulose content and high enzyme susceptibility, (10) production of lignin and/or derivatives of high quality, and (11) generation of little wastes (Garrote, Domı´nguez, & Parajo´, 1999). In this context, autohydrolysis seems an ideal pretreatment.…”

Section: Introductionmentioning

confidence: 99%

Biorefinery processes for the integral valorization of agroindustrial and forestal wastes Procesos de biorrefinería para la valorización integral de residuos agroindustriales y forestales

Alonso¹,

Domı́nguez²,

Garrote³

et al. 2011

CyTA - Journal of Food

Self Cite

View full text Add to dashboard Cite

Teniendo en cuenta el concepto de biorrefinerı´a, los autores de esta revisio´n, que pertenecen al Departamento de Ingenierı´a Quı´mica de la Universidad de Vigo, en la Facultad de Ciencias, han desarrollado sus investigaciones en este campo. Esta revisio´n muestra el trabajo del grupo en las dos u´ltimas de´cadas, basado en el fraccionamiento de materiales lignocelulo´sicos (residuos forestales, industriales y agrı´colas) para obtener diferentes productos, tales como compuestos feno´licos con efectos antioxidantes, oligosaca´ridos con propiedades prebio´ticas, a´cido la´ctico, bioetanol, materiales compuestos, etc.

show abstract

Production of Valuable Compounds by Supercritical Technology Using Residues from Sugarcane Processing

Prado

Meireles

2012

Biorefinery Co‐Products

View full text Add to dashboard Cite

Hydrothermal processing of lignocellulosic materials

Cited by 740 publications

References 56 publications

Strength properties of thermally modified softwoods and its relation to polymeric structural wood constituents

Strength properties of thermally modified softwoods and its relation to polymeric structural wood constituents

Biorefinery processes for the integral valorization of agroindustrial and forestal wastes Procesos de biorrefinería para la valorización integral de residuos agroindustriales y forestales

Production of Valuable Compounds by Supercritical Technology Using Residues from Sugarcane Processing

Contact Info

Product

Resources

About