Chemical composition changes in eucalyptus and pinus woods submitted to heat treatment

Brito, José Ótávio; Silva, F.G.; Leão, M.M.; Almeida, Giana

doi:10.1016/j.biortech.2008.03.069

Cited by 156 publications

(135 citation statements)

References 5 publications

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“…Thermal treatment above 160°C, however, caused an abrupt increase in the total extractives content (Table 1, C1). A similar increase in extractives level was also reported by Brito et al (2008) for Eucalyptus saligna when treated at temperatures above 160°C.…”

Section: Total Extractives Contentsupporting

confidence: 87%

“…The lignin proportion increased as a function of increasing maximum temperature in the thermal treatment (Table 2, C1; r = 0.3996), confirming findings obtained by Brito et al (2008), Kamdem et al (2002) and Sivonen et al (2002). This result BARRICHELO, 1979).…”

Section: Lignin Contentsupporting

confidence: 78%

“…There is no evidence in literature of the possibility of cellulose degrading and volatilizing in the range of maximum temperatures being tested (up to 200°C). Hemicelluloses, on the other hand, the constituent parts of which were fully or partially eliminated with thermal treatment (Figure 4), already show volatilization and degradation in the range of temperatures being used (BRITO et al, 2008;CANAS et al, 2007;SIVONEN et al, 2002). Given that cellulose, which remains virtually intact at temperatures below 200°C, is composed of glucose, it is expected that the amount of this monosaccharide also remain intact in the thermally treated samples, which leads to a relative increase in the proportion of this carbohydrate in samples.…”

Section: Carbohydrate Contentsmentioning

confidence: 99%

“…While studying the effects of a thermal treatment program on the chemical characteristics of wood from Eucalyptus saligna, Brito et al (2008) reported the following changes as a function of a temperature increase reaching up to 180ºC: a reduction in arabinose, mannose, galactose and xylose levels (constituent parts of hemicelluloses); a maintenance of the glucose content; an increase in relative levels of lignin and extractives.…”

Section: Introductionmentioning

confidence: 99%

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Effect of thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions

Moura

Brito

Júnior

2012

CERNE

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Thermal treatment (thermal rectification) is a process in which technological properties of wood are modified using thermal energy, the result of which is often value-added wood. Thermally treated wood takes on similar color shades to tropical woods and offers considerable resistance to destructive microorganisms and climate action, in addition to having high dimensional stability and low hygroscopicity. Wood samples of Eucalyptus grandis were subjected to various thermal treatments, as performed in presence (140ºC; 160ºC; 180ºC) or in absence of oxygen (160ºC; 180ºC; 200ºC) inside a thermal treatment chamber, and then studied as to their chemical characteristics. Increasing the maximum treatment temperatures led to a reduction in the holocellulose content of samples as a result of the degradation and volatilization of hemicelluloses, also leading to an increase in the relative lignin content. Except for glucose, all monosaccharide levels were found to decrease in samples after the thermal treatment at a maximum temperature of 200ºC. The thermal treatment above 160ºC led to increased levels of total extractives in the wood samples, probably ascribed to the emergence of low molecular weight substances as a result of thermal degradation. Overall, it was not possible to clearly determine the effect of presence or absence of oxygen in the air during thermal treatment on the chemical characteristics of the relevant wood samples.

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Section: Total Extractives Contentsupporting

confidence: 87%

Section: Lignin Contentsupporting

confidence: 78%

Section: Carbohydrate Contentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions

Moura

Brito

Júnior

2012

CERNE

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“…Some laboratorial scale studies have been performed about thermal modification of eucalyptus wood, mostly Eucalyptus globulus (Esteves et al 2007a, Esteves et al 2007b, Esteves et al 2008 from Portugal, Eucalyptus grandis (Batista and Klitzke 2010, Batista et al 2011, Calonego et al 2010, Moura et al 2012, Pessoa et al 2006, Pincelli et al 2002 and Eucalyptus saligna (Brito et al 2008) from Brazil.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Brazilian thermal modification process on the chemical composition of Eucalyptus grandis juvenile wood: Part 1: Cell wall polymers and extractives contents

Batista

Muñiz

Oliveira

et al. 2016

Maderas, Cienc. tecnol.

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This article reports the first study of the influence of the Brazilian process of thermal modification called VAP HolzSysteme ® on the chemical composition of Eucalyptus wood. Flatsawn boards of Eucalyptus grandis juvenile wood were tested for four treatment levels: untreated and thermally modified at final cycle temperatures of 140, 160 and 180 °C. Chemical analyses were carried out according to the standards of the Technical Association of the Pulp and Paper Industry and encompassed total extractives, insoluble lignin, holocellulose (cellulose + hemicelluloses) and solvent soluble extractives in water (cold and hot) and ethanol:toluene (1:2 v.v.) mixture. The chemical composition of thermally modified Eucalyptus grandis juvenile wood was significantly changed by the VAP HolzSysteme ® process compared to untreated wood. Only the wood thermally modified at final cycle temperature of 180 °C was significantly different for all the chemical analyses performed compared to untreated wood.

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Alkaline sulfite/anthraquinone pretreatment followed by disk refining ofPinus radiataandPinus caribaeawood chips for biochemical ethanol production

Franco

Ferraz

Milagres

et al. 2012

J of Chemical Tech & Biotech

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BACKGROUND: Alkaline sulfite/anthraquinone (ASA) cooking of Pinus radiata and Pinus caribaea wood chips followed by disk refining was used as a pretreatment for the production of low lignified and high fibrillated pulps. The pulps produced with different delignification degrees and refined at different energy inputs (250, 750 and 1600 Wh) were saccharified with cellulases and fermented to ethanol with Saccharomyces cerevisiae using separated hydrolysis and fermentation (SHF) or semi-simultaneous saccharification and fermentation (SSSF) processes.

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Chemical composition changes in eucalyptus and pinus woods submitted to heat treatment

Cited by 156 publications

References 5 publications

Effect of thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions

Effect of thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions

Effect of the Brazilian thermal modification process on the chemical composition of Eucalyptus grandis juvenile wood: Part 1: Cell wall polymers and extractives contents

Alkaline sulfite/anthraquinone pretreatment followed by disk refining ofPinus radiataandPinus caribaeawood chips for biochemical ethanol production

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