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Identifying Primary Reactions and Products of Fast Pyrolysis of Alkali Lignin
Journal of Analytical and Applied Pyrolysis ( IF 6 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jaap.2020.104917
Supriyanto , David O. Usino , Päivi Ylitervo , Jinze Dou , Mika Henrikki Sipponen , Tobias Richards

Abstract This study focused on the effect of temperature and residence time on the primary thermal decomposition reactions during a fast pyrolysis of softwood alkali lignin. The use of Py-GC/MS/FID (Micropyrolyser-Gas Chromatography/Mass Spectrometry/Flame Ionization Detector) allowed for rapid heating of the sample and detailed identification and quantification of the pyrolysis products at a temperature range of 400–600 °C, with residence times from 0.5–5 s. The identified primary pyrolysis products were mainly volatile guaiacyl-type compounds. There was a general increase in yield for the majority of the volatile compounds with increased temperature and time. The cleavage of the lignin polymer to linear carbonyl (acetaldehyde) and guaiacyl-type aromatic compounds increased with temperature, while that of catechol and cresol type was mainly favoured at 500 and 600 °C. Based on these results, a mechanistic pathway for the pyrolytic process was proposed, drawing a linkage from structural units of lignin to the formed primary products. In summary, our findings suggest that the primary decomposition reactions that occur under the fast pyrolysis conditions can be controlled by varying the process temperature and residence time, and deliver mechanistic insight into the product distribution from structurally complex lignin material.

中文翻译:

鉴定碱木质素快速热解的初级反应和产物

摘要 本研究侧重于软木碱木质素快速热解过程中温度和停留时间对主要热分解反应的影响。使用 Py-GC/MS/FID(Micropyrolyser-Gas Chromatography/Mass Spectrometry/Flame Ionization Detector)可以在 400–600 °C 的温度范围内快速加热样品并详细鉴定和量化热解产物,停留时间为 0.5-5 秒。鉴定的初级热解产物主要是挥发性愈创木酰基型化合物。随着温度和时间的增加,大多数挥发性化合物的产率普遍增加。木质素聚合物裂解为线性羰基(乙醛)和愈创木酰基型芳族化合物随温度增加,而邻苯二酚和甲酚类的则主要在 500 和 600 ℃ 下受到青睐。基于这些结果,提出了一种热解过程的机械途径,将木质素的结构单元与形成的初级产品联系起来。总之,我们的研究结果表明,在快速热解条件下发生的主要分解反应可以通过改变工艺温度和停留时间来控制,并提供对结构复杂木质素材料产物分布的机械洞察。
更新日期:2020-10-01
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