Abstract As a sedimentary rock composed of organic carbonaceous matters with different molecular sizes and inorganic minerals, coal can be extracted by organic solvents and dissolved by acids to make chemical compositions and structures changed, thus influencing on the occurrence and migration of coalbed methane (CBM). For the purpose of investigating the impacts of different solvents on coal structure, semi-anthracite coal samples from Huoerxinhe coalmine in the central part of Qinshui Basin were treated by four single solvents (tetrahydrofuran (THF), carbon disulfide (CS 2 ), hydrochloric acid (HCl) and chlorine dioxide (ClO 2 )), and by combined solvents (an organic solvent and an inorganic solvent with different treatment orders). Then the solubility behaviors of the organic compounds or inorganic matters from coal were investigated and the changes of the functional groups and the microcrystalline structure in coal were addressed using Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The results show the extraction yields of organic solvents are significantly greater than the dissolution yields of inorganic solvents, and the solubility of HCl is relatively higher than that of ClO 2 . Specifically, main functional groups in coal, including aliphatic, aromatic and oxygen-containing functional groups, have a decline tendency to different degrees under the treatment of organic solvents. Further, main microcrystalline structure parameters increase in vertical direction but reduce in parallel direction of the aromatic carbon network layer with the swelling effect, regardless of an organic solvent or inorganic solvent treatment. Only by the organic solvent treatment, do the d 002 values of the basic structure unit of coal appear dramatically enlarged characteristics. Whereas, main functional groups and microcrystalline structure in coal show relatively complex features within the combined solvents treatment because of the phenomenon of pore-blockade, pore-expansion or slight solvent retention. Based on the change characteristics and mechanisms, the chemical structure model of semi-anthracite coal is put forward for providing a reference for the further study of coal structure.

中文翻译：

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傅里叶变换红外光谱和X射线衍射研究半无烟煤多组分溶解度及其对煤结构的影响

摘要 煤是由不同分子大小的有机碳质物质和无机矿物组成的沉积岩，能被有机溶剂萃取，被酸溶解，使化学成分和结构发生变化，从而影响煤层气（CBM）的赋存和运移。 . 为研究不同溶剂对煤结构的影响，采用四氢呋喃（THF）、二硫化碳（CS 2 ）、盐酸四种单一溶剂对沁水盆地中部霍尔新河煤矿的半无烟煤样品进行处理。 (HCl) 和二氧化氯 (ClO 2 ))，以及混合溶剂（有机溶剂和无机溶剂，处理顺序不同）。然后研究了煤中有机化合物或无机物的溶解行为，并利用傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）解决了煤中官能团和微晶结构的变化。结果表明，有机溶剂的萃取率明显大于无机溶剂的溶解率，HCl的溶解度相对高于ClO 2 。具体来说，煤中的主要官能团，包括脂肪族、芳香族和含氧官能团，在有机溶剂的处理下都有不同程度的下降趋势。更多，无论有机溶剂或无机溶剂处理如何，主要微晶结构参数在垂直方向增加但在芳族碳网络层的平行方向随着溶胀效应减小。只有经过有机溶剂处理，煤的基本结构单元的d 002 值才出现显着放大的特征。而煤中的主要官能团和微晶结构由于存在堵孔、扩孔或溶剂轻微滞留现象，在组合溶剂处理中表现出相对复杂的特征。根据变化特征和机理，提出半无烟煤的化学结构模型，为进一步研究煤结构提供参考。无论是有机溶剂处理还是无机溶剂处理。只有经过有机溶剂处理，煤的基本结构单元的d 002 值才出现显着放大的特征。而煤中的主要官能团和微晶结构由于存在堵孔、扩孔或溶剂轻微滞留现象，在组合溶剂处理中表现出相对复杂的特征。根据变化特征和机理，提出半无烟煤的化学结构模型，为进一步研究煤结构提供参考。无论是有机溶剂处理还是无机溶剂处理。只有经过有机溶剂处理，煤的基本结构单元的d 002 值才出现显着放大的特征。而煤中的主要官能团和微晶结构由于存在堵孔、扩孔或溶剂轻微滞留现象，在组合溶剂处理中表现出相对复杂的特征。根据变化特征和机理，提出半无烟煤的化学结构模型，为进一步研究煤结构提供参考。煤中的主要官能团和微晶结构由于存在堵孔、扩孔或轻微的溶剂滞留现象，在组合溶剂处理中表现出相对复杂的特征。根据变化特征和机理，提出半无烟煤的化学结构模型，为进一步研究煤结构提供参考。煤中的主要官能团和微晶结构由于存在堵孔、扩孔或轻微的溶剂滞留现象，在组合溶剂处理中表现出相对复杂的特征。根据变化特征和机理，提出半无烟煤的化学结构模型，为进一步研究煤结构提供参考。