萃取反萃取法研究新峪焦精煤中有机硫的赋存规律

以高含有机硫的新裕焦精煤为研究对象,采用萃取反萃取和分级萃取的分离方法及XPS、GC/MS等分析技术,对原煤和各族组分内不同结构的有机硫分布情况进行了研究,重点考察了各类型有机硫在煤有机质本体结构及族组分中的赋存规律。结果表明,组分总硫基赋存分率则与复杂性程度正好相反;可溶性含硫组分在总溶出物中的分布,相对不同族组分而言总体均衡;可溶性的共轭结构类有机硫主要赋存于煤密中质组中,其次是疏中质组中且以噻吩类为主,较少赋存于煤重质组中;而可溶性的脂肪结构类有机硫则主要赋存于煤重质组和密中质组中,较少赋存于疏中质组中;各族组分内有机硫的萃取率随时间的变化规律具有明显的加和性,族组分内可溶含硫组分的溶出行为相互独立,符合煤嵌布结构模型的基本思想;煤中不同形态有机硫的赋存遵循"相似相溶"原理。

Study on occurrence of organic sulfur in Xinyu clean coking coal by extraction and stripping

Xinyu clean coal rich in organic sulfur was chosen to study the distribution of organic sulfur with different structures in raw coal and its group components. Analysis techniques including X-ray photoelectron spectroscopy (XPS), gas chromatography/mass spectrometer (GC/MS), etc. and separation methods of extraction and stripping and fractional extraction were applied, with a focus on the occurrence of different organic sulfur in coal organic matter and its group components. The results show that there is a significant negative correlation between the occurrence ratio based on total sulfur in some group components and the structure complexity. The distribution of soluble sulfur-containing components in total dissolving-out substances is generally uniform, compared with that in each group component. Most soluble organic sulfur with conjugated structure is distributed over the dense medium component, but fewer in loose medium component, which is predominantly in the form of thiophene sulfur, and the fewest in heavy component. Soluble organic sulfur with aliphatic structure is mainly distributed over heavy component and dense medium component, but rarely in loose medium component. Evident additivity is observed in the extract yield of organic sulfur in each group component with the change of extraction time while the dissolution behaviors of soluble sulfur-containing components in the group component are mutual independence. This is consistent with the basic idea of coal inbuilt structure model. The occurrence of organic sulfur in coal follows the rule of similarity-intermiscibility.