镜煤抽提物热解特性的实验研究

采用热重分析仪和热解/红外联用仪（Py-FTIR）考察了镜煤四氢呋喃抽提物的热解过程。热重的研究结果表明：抽提物的热解失重行为与镜煤的热解失重行为有很大不同，前者有两个明显的DTG峰，190 ℃左右时出现一个DTG峰，在439 ℃出现第二个DTG峰，与镜煤相比，抽提物的失重速率显著高于镜煤，且最大失重峰向低温区移动。抽提物的热解产物中脂肪烃的释放量多于镜煤，而且脂肪烃类产物释放的温度区间小，说明脂肪烃的释放更集中和快速，但是甲烷的生成量明显少于镜煤；抽提物热解产物中有少量的CO2生成，几乎没有产生CO。

EXPERIMENTAL STUDY ON PYROLYSIS OF EXTRACT FROM VITRAIN

The compound with low molecular weight is thought to play a key role in the structure of coals and has a significant effect on the process of coal pyrolysis. The purpose of this paper is to describe the characteristic of pyrolytic process of extract. The sample was obtained from vitrain extracted by tetrahydrofuran. The thermal decomposition behavior of vitrain and its extract were investigated by TG and Py-FTIR, the latter can continuously obtain IR spectra of the volatiles as the sample is heated. The TG and DTG curves of extract are different from those of vitrain. The rate of weight loss of extract is higher than that of vitrain. Two peaks in DTG curve of extract were observed at 190 ℃ and 452 ℃ individually, while no peak was observed at 190 ℃ for vitrain. The maximum peak in DTG curve moves towards low temperature compared with vitrain. The results of Py-FTIR shows that the amounts of aliphatics evolution of extract is higher than those of vitrain, the evolution profile indicates the evolution of aliphatic compounds is fast. The amounts of methane and CO2 evolution from extract were lower than those of vitrain, no CO was produced from extract.