石油与天然气地质 ›› 1988, Vol. 9 ›› Issue (1): 56-63.doi: 10.11743/ogg19880107

• 问题讨论 • 上一篇    下一篇

褐煤的结构与热降解模型初探——兼与杨文宽同志商榷

秦匡宗   

  1. 华东石油学院北京研究生部
  • 收稿日期:1987-05-19 出版日期:1988-03-25 发布日期:2012-01-16

A DEBATE ON THE STRUCTURE AND THERMO-DEGRADATION MECHANISM OF BROWN COAL

Qin Kuangzhong   

  1. Beijing Graduate School of Huadong College of Petroleum
  • Received:1987-05-19 Online:1988-03-25 Published:2012-01-16

摘要:

现代研究煤的结构模型的特点,是用一系列化学与仪器分析测定的结构参数来进行表述。据此对杨文宽提出的褐煤模型用文献中的参数进行了校核,认为芳氢率偏低、环缩合指数偏高,官能团分布需作适当调整。在热降解的机理中,为数不多的甲氧基在最初阶段即已脱落,对生烃的贡献不大;芳环上取代基的β位化学键的解离在热降解过程中起了重要作用。芳环上的甲基参与了脱氢与环化,生成的甲烷不多,而与芳环骈合的脂环容易开裂生成烃类,不可低估它的贡献。文中还讨论了化学结构模型与热降解步骤之间的各种关系。

Abstract:

The modern typical structural model of brown coal may be described by its structural parameters determined by various chemical and instrumental analyses,and the model suggested by Mr. Yang was so examined with current literature data. Higher hydrogen aromaticity, lower ring condensation index and an appropriate adjustment of the distribution of functional groups were proposed for the modification of the model. As for the mechanism of its thermodegradation,tha methoxyl group seems to be dissociated readily during the initial stage and contributes only little of methane. The role of β-scission of the substituents on the aromatic rings is emphasized since the conjugation effect due to the aromatic double bonds lowered significantly the dissociation energy of the β-bond.The methyl group on the aromatic ring tends to the cyclization rather than demethylation, so limits the formation of methane from the methyl group.However, the naphthenic ring such as in the structure of tetralin, ruptures more easily than its dehydrogenation, its potential of hydrocarbon formation must not be underestimated. The relation between the structural model and the thermo-degradation mechanism is also approached.