不同温度条件下木素模型物的热裂解产物的GC/MS研究

合成了一种β-O-4型木素模型化合物即愈创木基丙三醇-β-愈创木基醚,并利用红外光谱,核磁共振谱对其进行了分析和确认。在此基础上,研究了不同温度条件下(315℃~500℃)木素模型物的热裂解行为,利用GC/MS定性分析了裂解产物,讨论了部分产物与裂解温度之间的关系。实验结果表明:木素模型物在高温下(<400℃),裂解成愈创木酚、4-酰基愈创木酚等小分子的碎片,模型物裂解产物种类随温度的升高随之增多,但在更高的温度(>400℃),裂解的产物发生了聚合。

Research on Pyrolysis of Lignin Model Compound at Different Temperatures Traced by GC/MS

A β-O-4 type lignin model compound i.e. guaiacylglycerol-β-guaiacyl ether was synthesized. The technique of FT-IR and 1H-NMR were used to identify the chemical structure of the model compounds. After the lignin model compound was synthesized, pyrolysis was carried out at different temperatures. GC/MS was applied to analyze the products. The relationships between products and pyrolysis temperature are discussed.The results indicate that lignin model compounds were pyrolyzed to low molecular weight material such as guaiacol, 4-acetylguaiacol etc. at high temperature(<400℃),while the kind of pyrolysis products increased at the same time.However,a lot of condensed lignin fragments were formed at much higher temperature(>400℃).