Extractives and energetic properties of wood and charcoal

Zanuncio, Antônio José Vinha; Carvalho, Amélia Guimarães; Trugilho, Paulo Fernando; Monteiro, Thiago Campos

doi:10.1590/s0100-67622014000200018

Cited by 27 publications

(19 citation statements)

References 17 publications

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“…On the other hand, the proportion of extractives soluble in dichloromethane in P. radiata was higher than that in E. pellita. In general, conifers have a higher proportion of extractives soluble in dichloromethane than hardwoods, as reported for Pinus oocarpa and Pinus taeda in relation to Eucalyptus urophylla, Swietenia macrophylla, Tectona grandis and Vochysia guatemalensis (Morais et al 2005, Brand et al 2011, Moya and Tenorio 2013, Zanuncio et al 2014b). …”

Section: Resultsmentioning

confidence: 58%

Effect of extractives on wood color of heat treated Pinus radiata and Eucalyptus pellita

Zanuncio

Carvalho

Souza

et al. 2015

Maderas, Cienc. tecnol.

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Heat treatment can change wood color without any use of environmentally harmful chemicals, and the efficiency of this process depends on the raw material to be treated. The objective of this study was to evaluate the influence of extractives on the color change of Eucalyptus pellita and Pinus radiata wood during heat treatment. The extractives were extracted in cold water and in dichloromethane as well as totally removed and the wood was treated at 170°C and 200°C for three hours under atmospheric pressure and in presence of air for evaluating the lightness (L*), green-red coordinate (a*), blue-yellow coordinate (b*), color saturation (C) and tonality angle (H) values. Pinus radiata wood was more resistant to discoloration by heat treatment. The removal of total and cold water-soluble extractives before heat treatment changed the L* value of Pinus radiata, a* value of Eucalyptus pellita, and b*, C, and H values of both species. Removal of extractives soluble in dichloromethane did not affect the color of heat treated wood. Thus, understanding the influence of extractives on heat treated wood can allow adapting the raw material to the process for enhancing the applicability of heat treatment for changing wood color.

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Section: Resultsmentioning

confidence: 58%

Effect of extractives on wood color of heat treated Pinus radiata and Eucalyptus pellita

Zanuncio

Carvalho

Souza

et al. 2015

Maderas, Cienc. tecnol.

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“…The lignin and extractives degrade in temperatures higher than that used in this work. Thereby, wood with high lignin and extractives content results in a high gravimetric yield of charcoal and materials with high calorific value (Shebani et al 2008;Swithenbank et al 2011;Zanuncio et al 2014). However, the introduction of C. fimbriata increased the lignin and extractives content to a maximum at 2.03 and 2.05%, respectively, which was not sufficient to increase the gravimetric yield and calorific value of the charcoal.…”

Section: Resultsmentioning

confidence: 99%

Damage and Loss Due to Ceratocystis fimbriata in Eucalyptus Wood for Charcoal Production

et al. 2014

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“…These growth rates result from climate conditions and investment in tree breeding and silviculture management (CAMPINHOS Jr, 1999;GONÇALVES et al, 2008). The wood from these crops is used for diverse purposes, such as panel production (BAL;BEKTAŞ, 2014), energy (ZANUNCIO et al, 2013a;ZANUNCIO et al, 2013b;ZANUNCIO et al, 2014), lumber (ANANIAS et al, 2014;SEPULVEDA-VILLARROEL et al, 2015;ANDRADE et al, 2016) and cellulose pulp (OKAN et al, 2015;BARBOSA et al, 2016). This generates jobs and taxes for the Brazilian economy, but wind damage may limit the performance of this segment.…”

Section: Introductionmentioning

confidence: 99%

PULP PRODUCED WITH WOOD FROM Eucalyptus TREES DAMAGED BY WIND

Zanuncio

Carvalho

Carneiro

et al. 2016

CERNE

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Wind may damage eucalyptus trees, especially 24 months after planting, which can reduce wood fiber quality and hinder pulp production. The objective of this study was to evaluate the use of these materials in mixtures with wood from seven-yearold trees to produce pulp. Bleached pulp was produced using 100, 95, 85, 75 and 0% wood from seven-year-old eucalyptus trees, related to cutting age. Wood from two-yearold trees, when trees are most susceptible to damage by wind, completed each treatment. A 5 cm thick disc was taken from breast height (1.3m) on each tree for anatomical and ultrastructural characterization. The seven-year-old wood had lower vessel frequency and fibers with a longer length, higher cell wall fraction, higher modulus of elasticity and hardness, and a lower microfibril angle. Pulp refining decreased the opacity and specific volume, increased air resistance and improved mechanical properties. The addition of two-year-old wood to produce pulp reduced the mechanical properties and opacity, and increased the air resistance of the paper. The proportion of two-year-old wood that can be used in pulp production varied with the clone, parameter, and refining level. However, the pulp produced with 5% wood from two-year-old trees and 95% wood from sevenyear-old trees was similar to that with 100% seven-year-old wood. Therefore, 5% twoyear-old wood can be used to produce pulp without quality losses. PRODUÇÃO DE POLPA CELULÓSICA COM MADEIRA DE ÁRVORES DEEucalyptus DANIFICADAS PELO VENTO RESUMO: Árvores de eucalipto de rápido crescimento podem ser danificadas por ventos, principalmente 24 meses após o plantio, mas a baixa qualidade das fibras dessa madeira dificulta a produção de polpa celulósica. O objetivo deste estudo foi avaliar a utilização destes materiais para a fabricação de polpa celulósica em misturas com madeira de árvores de sete anos de idade. Polpa celulósica branqueada foi produzida com 100, 95, 85, 75 e 0% de madeira de árvores de dois clones de Eucalyptus grandis x Eucalyptus urophylla com sete anos de idade, relacionada com a idade de corte. Madeira de árvores de dois anos de idade, mais susceptíveis a danos por ventos, foi utilizada para completar cada tratamento. Um disco de espessura de 5 cm foi retirado na altura do peito (1,3 m) em cada árvore para a caracterização anatômica e ultra-estrutural. As árvores com sete anos apresentaram maior frequência de vasos, fibras com maior comprimento, fração parede, módulo de elasticidade e dureza e menor ângulo microfibrilar. O refino nas polpas diminuiu a opacidade e o volume específico e aumentou a resistência a passagem do ar e as propriedades mecânicas. A adição de madeira de dois anos de idade na produção de polpa celulósica reduziu a resistência mecânica e opacidade e aumentou a resistência à passagem de ar. A proporção da madeira de dois anos de idade, que pode ser utilizado na produção de polpa celulósica variou com o clone, parâmetro avaliado e intensidade do refino. No entanto, a polpa celulósica produzida com 5% de madeira de do...

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Extractives and energetic properties of wood and charcoal

Cited by 27 publications

References 17 publications

Effect of extractives on wood color of heat treated Pinus radiata and Eucalyptus pellita

Effect of extractives on wood color of heat treated Pinus radiata and Eucalyptus pellita

Damage and Loss Due to Ceratocystis fimbriata in Eucalyptus Wood for Charcoal Production

PULP PRODUCED WITH WOOD FROM Eucalyptus TREES DAMAGED BY WIND

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