The water absorption of sapwood and heartwood of Scots pine and Norway spruce heat-treated at 170 °C, 190 °C, 210 °C and 230 °C

Metsä-Kortelainen, Sini; Antikainen, Toni; Viitaniemi, Pertti

doi:10.1007/s00107-005-0063-y

Cited by 181 publications

(134 citation statements)

References 12 publications

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“…The treatments at 200, 220 and 240 °C showed significant difference when the wood was treated for 4 and 8 hours ( Table 2). The weight loss is a common characteristic of heat-treated wood and was identified in many studies 4,[11][12][13][14] . In other research, the authors 15 reported lower average weight loss for Eucalyptus globulus wood heat-treated with the presence of pressure and steam than in the present study.…”

Section: Resultsmentioning

confidence: 99%

Modification of static bending strength properties of Eucalyptus grandis heat-treated wood

et al. 2012

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The present study describes the effect of thermal rectification on physical and mechanical properties of Eucalyptus grandis wood at different levels of temperature and time. Samples of Eucalyptus grandis wood (10 × 10 × 200 mm) were heat-treated at 180, 200, 220 and 240 °C during 4 and 8 hours. The mechanical properties of heat-treated and untreated samples were determined by static bending tests. The physical properties were determined by weight loss and swelling tests. The results showed that modulus of elasticity, modulus of rupture, weight loss, volumetric swelling and linear swelling were affected significantly by the thermal rectification. However, the length of exposure influenced just weight loss, while the temperature influenced all the studied properties of heat-treated wood. More significant modifications with treatments at a temperature of 200 °C or higher were found in the properties of heat-treated wood.

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Section: Resultsmentioning

confidence: 99%

Modification of static bending strength properties of Eucalyptus grandis heat-treated wood

et al. 2012

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“…Although the acetylation process decreases the hygroscopicity of wood (Rowell 2006), it might also increase its capillary water uptake (Larsson and Simonson 1994). Similar changes in water uptake behavior were reported for TMT (Metsä-Kortelainen et al 2006). Information is scarce in terms of the changed water uptake behavior and the critical MC for onset of fungal growth (Meyer et al 2012).…”

Section: Introductionmentioning

confidence: 85%

“…ML is frequently correlated with TMT intensity and other properties such as durability, moisture behavior, and strength properties (Metsä-Kortelainen et al 2006;Brischke et al 2007;Paul et al 2007;Welzbacher et al 2007;Meyer et al 2011). By contrast, for chemical modification (CM) processes, the uptake of solid agents remaining after drying (weight percent gain [WPG]) is considered as a measure of modification intensity (Li et al 2000;Lande et al 2004;Mai and Militz 2004;Hill 2007).…”

Section: Introductionmentioning

confidence: 99%

Critical moisture conditions for fungal decay of modified wood by basidiomycetes as detected by pile tests

Meyer

Brischke

Treu³

et al. 2015

Holzforschung

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Abstract:The aim of cell wall modification is to keep wood moisture content (MC) below favorable conditions for decay organisms. However, thermally modified, furfurylated, and acetylated woods partly show higher MCs than untreated wood in outdoor exposure. The open question is to which extent decay is influenced by the presence of liquid water in cell lumens. The present paper contributes to this topic and reports on physiological threshold values for wood decay fungi with respect to modified wood. In total, 4200 specimens made from acetylated, furfurylated, and thermally modified beech wood (Fagus sylvatica L.) and Scots pine sapwood (sW) (Pinus sylvestris L.) were exposed to Coniophora puteana and Trametes versicolor. Piles consisting of 50 small specimens were incubated above malt agar in Erlenmeyer flasks for 16 weeks. In general, pile upward mass loss (ML) and MC decreased. Threshold values for fungal growth and decay (ML ≥ 2%) were determined. In summary, the minimum MC for fungal decay was slightly below fiber saturation point of the majority of the untreated and differently modified materials. Surprisingly, T. versicolor was able to degrade untreated beech wood at a minimum of 15% MC, and growth was possible at 13% MC. By contrast, untreated pine sW was not decayed by C. puteana at less than 29% MC.

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“…Yüksek sıcaklıklarda ligninin metoksi içeriği azalır. Ekstraktif maddelerin çoğu ısıl işlemler sırasında buharlaşabilmektedir [15][16][17]. Sonuç olarak sıcaklığın arttırılmasıyla birlikte organik katıyı oluşturan çeşitli bağlar daha etkin kopmakta ve gaz ürünlere dönüşmektedir.…”

Section: Bulgularunclassified

Kenaf Hidrolizi Sonrası Kalan Katı Atığın Gazlaştırılması

Meryemoğlu

Hasanoğlu

2017

SDÜ Fen Bil Enst Der

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Özet: Bu çalışmada kenaf biyokütlesinin subkritik su içinde hidrolizi sonucu çözünmeden kalan katı atığın katalitik gazlaştırılması gerçekleştirilmiştir. Gazlaştırma deneyleri farklı sıcaklıklarda (400, 500, 600, 700 °C), 0,62 cm dış ve 0,40 cm iç çapındaki paslanmaz çelikten yapılmış ve uzunluğu 40 cm olan reaktörde gerçekleştirilmiştir. Deneylerde katalizör olarak K2CO3, CaO, TiO2, Fe2O3 ve karbon destekli %5'lik Ru kullanıldı. Katalizörsüz deneylerde hidrojen oluşumu gözlenmezken en yüksek hidrojen (947 mL H2) verimi 700 °C'de Ru katalizörü kullanıldığında elde edilmiştir. 700 °C'de yapılan gazlaştırma deneyleri sonunda elde edilen sulu çözeltilerin toplam organik karbon (TOC) değerleri kullanılan katalizöre bağlı olarak TiO2 ˃ Fe2O3 ˃ CaO ˃ Ru şeklinde azalmıştır. Gasification of Solid Residue Left after Kenaf Hydrolysis Keywords Gasification, Hydrogen, Catalyst, KenafAbstract: The present study was carried out to catalytic gasification of the solid residue left after kenaf hydrolysis in subcritical water. The gasification experiments carried out in a stainless steel tubular reactor (40 cm in length, inner and outer diameter of 0.62 and 0,40 cm, respectively) at the different temperatures (400, 500, 600, 700°C). Catalytic activities were investigated catalysts such as K2CO3, CaO, TiO2, Fe2O3 and %5 Ru on carbon. The highest hydrogen yield (947 mL H2) was obtained at 700 ° C with using Ru catalyst, while no hydrogen formation was observed in the absence of catalyst. The total organic carbon (TOC) values of the aqueous solutions obtained after gasification experiments at 700 °C decreased with following order, TiO2 ˃ Fe2O3 ˃ CaO ˃ Ru, depending on the catalyst.

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The water absorption of sapwood and heartwood of Scots pine and Norway spruce heat-treated at 170 °C, 190 °C, 210 °C and 230 °C

Cited by 181 publications

References 12 publications

Modification of static bending strength properties of Eucalyptus grandis heat-treated wood

Modification of static bending strength properties of Eucalyptus grandis heat-treated wood

Critical moisture conditions for fungal decay of modified wood by basidiomycetes as detected by pile tests

Kenaf Hidrolizi Sonrası Kalan Katı Atığın Gazlaştırılması

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