Thermal Evolution Characteristics and Sulphur-bearing Compound Composition in Extract from High Organosulphur Coal
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摘要: 高有机硫煤是一种十分特殊的煤种，其特点之一是抽提物芳烃馏分中含丰富的含硫化合物。在我国西南地区晚二叠世碳酸盐台地潮坪成因、具不同煤化程度的四种高有机硫煤中均检测出了四种系列的含硫化合物，它们分别为二苯并噻吩系列、苯并萘并噻吩系列、菲并噻吩系列和苯并二苯半噻吩系列。含硫化合物的类型组成虽然相似，但它们的相互比例关系与煤化程度和具体的沉积环境密切相关。分析发现，随煤化程度增加：（1）具三环结构的二苯并噻吩相对于四、五环结构的化合物数量减少；（2）具稳定甲基取代位的含硫化合物数量不断增加，同时还发现含硫化合物与同环数的常规芳烃间的比值可反映碳酸盐台地受局限的程度。Abstract: High organosulfur coal (HO SC) is very special in that it is rich in sulfur-containing compounds (SCC) in aromatic fraction of extract. Four series of SCC, i. e., dibenzothiophene, benzonaphthrathiophene, phenanthrathiophene and benzobisbenzothiophene, have been detected in four coal samples, which were formed on restricted carbonate platform, and have varied ranks. Inspite of the similar constitutions with respect to SCC for four coal samples, their ratios between differnet series of SCC are closely related to coal rank and exact depositional environments. The results show that with increase of coal rank: (1) the relative amount of dibenzothiophene with 3-cycle structure decreases compared with other compounds with 4-, and 5-cycle structure and (2) those SCC with methy in stable positions of molecule increase. In the mean time, we also found that the amount ratio of SCC to normal aromatic hydrocarbon wth same cycles in molecule is a good indicatior of restricted extent of platform.
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Key words:
- HO SC /
- SCC /
- carbonate platform /
- coal rank
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