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Thermal degradation and compositional changes of wood treated in a semi-industrial scale reactor in vacuum
Journal of Analytical and Applied Pyrolysis ( IF 6 ) Pub Date : 2018-03-01 , DOI: 10.1016/j.jaap.2018.02.005
Bo-Jhih Lin , Baptiste Colin , Wei-Hsin Chen , Anélie Pétrissans , Patrick Rousset , Mathieu Pétrissans

Abstract Heat treatment is an eco-friendly and efficient way to improve the defective properties of woods, such as hygroscopic nature, lack of dimensional stability, and low resistance against biological degradation, and to produce a green and sustainable wood material for construction and buildings. The aim of this study is to investigate the thermal degradation of a hardwood (poplar, Populus nigra) and a softwood (fir, Abies pectinata) in a semi-industrial scale reactor in which a vacuum environment is adopted to intensify the thermal degradation process. Four different stages of thermal degradation during wood heat treatment are defined, based on the intensity of differential mass loss (DML). Meanwhile, a number of analyses on untreated and treated woods are performed to evaluate their thermal degradation characteristics and compositional change during treatment. The FTIR analysis clearly demonstrates the thermal degradation through dehydration, deacetylation, depolymerization, and condensation reactions during the heat treatment. In addition, the XRD analysis indicates an increase in relative crystallinity of cellulose. The correlation of devolatilization index (DI) with respect to mass loss of the two wood species is strongly characterized by linear distribution, which is able to provide a simple and useful tool in predicting mass loss of wood treated in wood industry.

中文翻译:

半工业规模真空反应器处理木材的热降解和成分变化

摘要 热处理是改善木材吸湿性、尺寸稳定性差、抗生物降解性低等缺陷特性,生产绿色、可持续的建筑和建筑用木材的一种环保、有效的方法。本研究的目的是研究硬木(杨树、黑杨)和软木(冷杉、枞树)在半工业规模反应器中的热降解,其中采用真空环境来加强热降解过程。根据差异质量损失 (DML) 的强度,定义了木材热处理过程中四个不同的热降解阶段。同时,对未经处理和处理过的木材进行了大量分析,以评估它们在处理过程中的热降解特性和成分变化。FTIR 分析清楚地证明了热处理过程中通过脱水、脱乙酰、解聚和缩合反应产生的热降解。此外,XRD 分析表明纤维素的相对结晶度增加。脱挥发分指数 (DI) 与两种木材质量损失的相关性具有很强的线性分布特征,可以为预测木材工业处理木材的质量损失提供一种简单而有用的工具。和热处理过程中的缩合反应。此外,XRD 分析表明纤维素的相对结晶度增加。脱挥发分指数 (DI) 与两种木材质量损失的相关性具有很强的线性分布特征,可以为预测木材工业处理木材的质量损失提供一种简单而有用的工具。和热处理过程中的缩合反应。此外,XRD 分析表明纤维素的相对结晶度增加。脱挥发分指数 (DI) 与两种木材质量损失的相关性具有很强的线性分布特征,可以为预测木材工业处理木材的质量损失提供一种简单而有用的工具。
更新日期:2018-03-01
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