Improvement of the thermal stability of lignocellulosic materials by treatment with sulphuric acid and potassium hydroxide
Improvement of the thermal stability of lignocellulosic materials by treatment with sulphuric acid and potassium hydroxide
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DOI：
10.1016/j.jaap.2004.04.001
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发表时间：
2004-08
影响因子：
6
通讯作者：
P. Álvarez;C. Blanco;R. Santamaría;M. Granda
中科院分区：
文献类型：
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作者：
P. Álvarez;C. Blanco;R. Santamaría;M. Granda
在这项研究中，从斯堪的纳维亚松木获得的木质纤维素原料在硫酸或氢氧化钾的存在下进行热处理，以提高其热稳定性。通过热重分析监测反应产物的热分解，并通过光学显微镜分析在900°C下获得的焦炭的微观结构。结果表明，硫酸和氢氧化钾通过不同的反应机理转化木质纤维素原料。硫酸在不掺入硫的情况下反应，而氢氧化钾掺入木质纤维素原料中。在这两种情况下，所得反应产物更热稳定，并且在热天平中在1000°C下产生比母体原料更高的残余物。通过光学显微镜观察在900°C下获得的焦炭证明，硫酸保留了母体原料的蜂窝结构，而氢氧化钾产生在碳化期间通过熔融阶段的反应产物。
In this study, a lignocellulosic feedstock obtained from Scandinavian pine wood was thermally treated in the presence of sulphuric acid or potassium hydroxide in order to improve its thermal stability. The thermal decomposition of the reaction products was monitored by thermogravimetric analysis and the microstructure of the chars obtained at 900°C was analysed by optical microscopy. The results show that sulphuric acid and potassium hydroxide transform the lignocellulosic feedstock via different mechanisms of reaction. Sulphuric acid reacts without the incorporation of sulphur, while potassium hydroxide is incorporated into the lignocellulosic feedstock. In both cases, the resultant reaction products are more thermally stable and yield higher residues at 1000°C than the parent feedstock in thermobalance. Observation by optical microscopy of the chars obtained at 900°C evidences that sulphuric acid preserves the honeycomb structure of the parent feedstock, while potassium hydroxide yields a reaction product that passes through a fused stage during carbonization.